Journal articles: 'SiC nanoparticles'

1

Lee, Chang Woo, Y. S. Shin, and S. H. Yoo. "Effect of SiC Nanoparticles Dispersion on the Microstructure and Mechanical Properties of Electroplated Sn-Bi Solder Alloy." Journal of Nano Research 11 (May 2010): 113–18. http://dx.doi.org/10.4028/www.scientific.net/jnanor.11.113.

Full text

Abstract:

The effect of SiC nanoparticle dispersion was investigated for microstructure change and mechanical properties of Sn-Bi electroplated alloys. The diameters of SiC nanoparticle in this study were 45-55 nm. The SiC nanoparticles were mixed with Sn-Bi electroplating and then the nanoparticles were dispersed with ultrasonic vibrator. After the dispersion, the SiC dispersed Sn-Bi alloys were electroplated on Cu deposited Si wafer. The microstructure and mechanical properties of the sample were evaluated by FE-TEM, FE-SEM, EDS, and shear tester. For TEM observation, the specimens were prepared by ultramicrotome and FIB. The SiC nanoparticles were well-dispersed in Sn-Bi alloy. SiC particles were located near grain boundaries or grain inside. The average grain size of the solder alloy was decrease about 30% compared with the grain size of Sn-Bi alloy prepared in the same condition. Due to the grain refinement and dispersion hardening by SiC nanoparticles, the SiC dispersed Sn-Bi alloy is expected to obtain high reliability and joining strength when it applied to interconnection materials.

APA, Harvard, Vancouver, ISO, and other styles

2

Parida, Bhaskar, Jaeho Choi, Gyoungho Lim, Kiseok Kim, and Keunjoo Kim. "Enhanced Visible Light Absorption by 3C-SiC Nanoparticles Embedded in Si Solar Cells by Plasma-Enhanced Chemical Vapor Deposition." Journal of Nanomaterials 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/953790.

Full text

Abstract:

Solar cells with 3C-SiC nanoparticles embedded in the Si were investigated by plasma-enhanced chemical vapor deposition. Several sizes of SiC nanoparticles were used as the intermediate layer for the solar cell. The Si thin films showed the formation of micro- and nanocrystallites on the SiC nanoparticle sites, which play an important role of heating block as a nanosubstrate. The Raman spectra revealed that the SiC nanoparticles were embedded in mixed phases of amorphous and nanocrystalline Si. Compared to the conventional solar cell sample, the photoreflectance was significantly reduced in the UV/visible spectral region due to the presence of the embedded 3C-SiC nanoparticles. The Si nanocrystals formed by the thin film deposition played an important role in reducing the photoreflectance within the visible to infrared spectral zones. Furthermore, the SiC nanoparticles contributed less in the photoabsorption at a longer infrared spectral zone wavelength of 1200 nm.

APA, Harvard, Vancouver, ISO, and other styles

3

Sun, Shuang Shuang, Fang Wu Jia, and Zhen Jing Li. "Investigation on the Dispersion of SiC Nanoparticles in Rubber Matrix." Applied Mechanics and Materials 182-183 (June 2012): 139–43. http://dx.doi.org/10.4028/www.scientific.net/amm.182-183.139.

Full text

Abstract:

SiC nanoparticles were treated by hydrofluoric acid (HF) and then put into the formulation of tread compounds of tire. After being mixed fully in the open mill and vulcanized in the sulfuration machine, some rubber nanocomposites filled with SiC nanoparticles were finally prepared out. The SiC nanoparticle reinforced rubber composites were observed by Scanning Electron Microscope (SEM). It was found that SiC nanoparticles show good uniformity of dispersion and unobvious agglomeration of particles in rubber matrix after short-time treatment by HF, while they show bad uniformity of dispersion and obvious agglomeration of particles in rubber matrix after long-time treatment by HF.

APA, Harvard, Vancouver, ISO, and other styles

4

Nychyporuk, Tetyana, Olivier Marty, Jean Marie Bluet, Vladimir Lysenko, Robert Perrin, Gérard Guillot, and Daniel Barbier. "Formation, Morphology and Optical Properties of SiC Nanopowder." Materials Science Forum 527-529 (October 2006): 763–66. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.763.

Full text

Abstract:

SiC nanopowder has been formed using an original technological approach based on grinding of bulk porous SiC nanostructures. The initial porous SiC nanostructures were obtained by anodization of n+-type 4H-SiC substrate in HF/Ethanol solution under UV illumination. Large single SiC nanoparticles (~ 30 nm in diameter) constituting the nanopowder have a porous structure which can be clearly visible. On the other hand, small single SiC nanoparticles (~ 4 nm in diameter) exhibit a clear crystalline structure. A broad and very intense luminescence band (400 – 900 nm) provided from the nanopowder corresponds to the radiative processes involving nanoparticle surface states. A smaller photoluminescence peak centred at 358 nm may correspond to radiative recombination of the photogenerated excitons confined in the individual and spatially separated 4HSiC nanoparticles.

APA, Harvard, Vancouver, ISO, and other styles

5

Hassanzadeh-Aghdam, Mohammad K. "Micromechanics-based thermal expansion characterization of SiC nanoparticle-reinforced metal matrix nanocomposites." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 1 (January 30, 2018): 190–201. http://dx.doi.org/10.1177/0954406218756447.

Full text

Abstract:

Understanding the structure–property relations for metal matrix nanocomposites reinforced with nanoparticles is a key factor for a reliable and optimal design of such new material systems. In the present study, coefficient of thermal expansion of silicon carbide (SiC) nanoparticle-reinforced aluminum (Al) matrix nanocomposites is predicted using a three-dimensional unit cell based micromechanical approach. The model takes into account the aluminum carbide (Al4C3) interphase region formed due to the reaction between SiC nanoparticles and surrounding Al matrix. The effects of some critical parameters, including volume fraction and diameter of SiC nanoparticles, interphase features such as geometry and material properties on the coefficient of thermal expansion of Al nanocomposite are extensively investigated. The obtained results clearly reveal the high influence of the interphase region on the coefficient of thermal expansion of Al nanocomposite. Based on the simulation results, the coefficient of thermal expansion of Al nanocomposite nonlinearly decreases with the increase in the interphase thickness or decreasing SiC nanoparticles diameter. Furthermore, the role of interphase in the thermal expansion behavior of Al nanocomposite becomes more prominent with the reduction in the nanoparticle diameter. Also, the coefficient of thermal expansion of Al nanocomposite linearly decreases as SiC nanoparticle volume fraction increases.

APA, Harvard, Vancouver, ISO, and other styles

6

Koh, Young-Hag, Hae-Won Kim, and Hyoun-Ee Kim. "Microstructural evolution and mechanical properties of Si3N4–SiC (nanoparticle)–Si3N4 (whisker) composites." Journal of Materials Research 15, no. 2 (February 2000): 364–68. http://dx.doi.org/10.1557/jmr.2000.0057.

Full text

Abstract:

The effects of SiC-nanoparticle and Si3N4-whisker additions on the microstructural evolution and mechanical properties of Si3N4 were investigated. The addition of SiC nanoparticles suppressed Si3N4 grain growth, leading to an improvement in the flexural strength. On the other hand, Si3N4 whiskers in the specimen promoted the formation of large elongated grains, which were found to be beneficial to the fracture toughness of the material. When both SiC nanoparticles and Si3N4 whiskers were added concurrently, large grains were formed in fine matrix grains. The microstructure of Si3N4 was controlled by adjusting the relative concentrations of SiC nanoparticles and the Si3N4 whiskers added. These compositional and microstructural variations of the Si3N4 had significant influence on the mechanical properties, such as strength, fracture toughness, R-curve behavior, and high-temperature strength.

APA, Harvard, Vancouver, ISO, and other styles

7

Yang, Lixia, Fei Wang, Jiahao Liao, Zhaofeng Chen, and Zongde Kou. "Microstructure and Mechanical Properties of Unidirectional, Laminated Cf/SiC Composites with α-Al2O3 Nanoparticles as Filler." Nanomaterials 12, no. 19 (September 28, 2022): 3406. http://dx.doi.org/10.3390/nano12193406.

Full text

Abstract:

The effects of an α-Al2O3 nanoparticle filler in the SiC matrix on the mechanical properties and failure mechanism of the unidirectional, laminated carbon fiber-reinforced SiC composites were investigated in this work. First, α-Al2O3 nanoparticles were added to the carbon fiber bundles using a slurry impregnation method, and then the Cf/SiC composite with an α-Al2O3 nanoparticle filler (Cf/SiC-Al2O3) was fabricated using a precursor infiltration and pyrolysis method. The microstructure of the Cf/SiC-Al2O3 composite showed chemical compatibility between the α-Al2O3 and the pyrolysis SiC. The Cf/SiC-Al2O3 composite with a low porosity of ~6.67% achieved a good flexural strength of 629.3 MPa and a good fracture toughness of 25.2 MPa·m1/2. The interlaminar shear strength of the Cf/SiC-Al2O3 composite was 11.7 MPa. The SiC-Al2O3 matrix also presented a considerable Young’s modulus of 138.2 ± 8.66 GPa and hardness of 10.3 ± 1.03 GPa. Further analysis indicated that the good mechanical properties with the addition of an α-Al2O3 filler were not only related to the dense matrix and the improvement of the mechanical properties of the matrix. They also originated from the thermal residual compressive stress in the SiC matrix close to the α-Al2O3 nanoparticles caused by the thermal expansion mismatch, which could reflect and close the cracks in the matrix. The findings of this study provide more methods for designing new composites exhibiting a good performance.

APA, Harvard, Vancouver, ISO, and other styles

8

Wei, Yi, Ahmed Fadil, and Hai Yan Ou. "Localized Surface Plasmon on 6H SiC with Ag Nanoparticles." Materials Science Forum 897 (May 2017): 634–37. http://dx.doi.org/10.4028/www.scientific.net/msf.897.634.

Full text

Abstract:

Silver (Ag) nanoparticles (NPs) were deposited on the surface of bulk Nitrogen-Boron co-doped 6H silicon carbide (SiC), and the Ag NPs were observed to induce localized surface plasmons (LSP) resonances on the SiC substrate, which was expected to improve the internal quantum efficiency (IQE) of the emissions of the donor-acceptor pairs of the SiC substrate. Room-temperature measurements of photoluminescence (PL), transmittance and time-resolved photoluminescence (TRPL) were applied to characterize the LSP resonances. Through the finite-difference time-domain (FDTD) simulation of the LSP resonance of an Ag nanoparticle on the SiC substrate, it is predicted that when the diameter of the cross section on the xy plane of the Ag nanoparticle is greater than 225 nm, the LSP starts to enhance the PL intensity. With implementation of a 3rd order exponential decay fitting model to the TRPL results, it is found that the average minority carrier lifetime of the SiC substrate decreased.

APA, Harvard, Vancouver, ISO, and other styles

9

He, Chun Lin, Ying Ying Bai, De Yuan Lou, Guo Feng Ma, Jan Ming Wang, Zhao Fu Du, and Dong Liang Zhao. "Corrosion Resistance of SiC_p/Al Metal Matrix Nanocomposites." Advanced Materials Research 773 (September 2013): 468–71. http://dx.doi.org/10.4028/www.scientific.net/amr.773.468.

Full text

Abstract:

The effect of volume fraction of SiC nanoparticles on the corrosion resistance of the SiCp/Al metal matrix composites (MMCs) in 3.5 wt.% NaCl aqueous solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The results show that pitting susceptibility is about the same for the nanocomposites and the correspondingly unreinforced matrix metal Al, and the corrosion potentials of the MMCs are about 50 mV-60 mV more positive than that of the unreinforced Al, and is independent of the volume fraction of SiC nanoparticles. The corrosion resistance for the nanocomposite slightly decreases when the volume fraction increases due to both SiC nanoparticle agglomeration and promoting galvanic corrosion between SiC and Al.

APA, Harvard, Vancouver, ISO, and other styles

10

Jung, Se-Woong, and Sang-Mo Koo. "SiC Nanoparticles-Incorporated ZTO/SiC Heterojunction Diodes." Journal of Nanoscience and Nanotechnology 17, no. 10 (October 1, 2017): 7205–8. http://dx.doi.org/10.1166/jnn.2017.14738.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Kandemir, Sinan. "Microstructure and mechanical properties of A357/SiC nanocomposites fabricated by ultrasonic cavitation-based dispersion of ball-milled nanoparticles." Journal of Composite Materials 51, no. 3 (July 28, 2016): 395–404. http://dx.doi.org/10.1177/0021998316644850.

Full text

Abstract:

In this work, A357/0.5 wt.% SiC nanocomposites were fabricated with a combination of ultrasonic processing and a nanoparticle feeding mechanism that involves the introduction of a closed end aluminium tube filled with the ball-milled SiC nanoparticles (20–30 nm) and aluminium powders (<75 µm) into the melt for complete deagglomeration and uniform dispersion of nanoparticles through the matrix. The microstructural and mechanical properties of the fabricated nanocomposites were investigated. The microstructural studies conducted with optical and advanced electron microscopes indicate that relatively effective deagglomeration and uniform dispersion of SiC nanoparticles into the molten alloy were achieved. The hardness and tensile properties of the nanocomposites were notably improved compared to those of the ultrasonically processed A357 alloy without reinforcement, showing the strengthening potency of nanoparticles and the good bonding obtained at the particle-reinforcement interface.

APA, Harvard, Vancouver, ISO, and other styles

12

Mitomo, Mamoru, Chong-Min Wang, and Hideyuki Emoto. "Precipitation of carbon nanoparticles encapsulating silicon carbide from molten oxide." Journal of Materials Research 13, no. 8 (August 1998): 2039–41. http://dx.doi.org/10.1557/jmr.1998.0285.

Full text

Abstract:

A kind of fullerenes, carbon nanoparticle encapsulating β–SiC grain, was precipitated during cooling Al2O3–Y2O3 –CaO oxide melt containing SiC and C from 2023 K. The SiC grains with a diameter of 5–20 nm were covered with 2–4 graphitic carbon layers with the spacing of 0.34 nm as revealed by high resolution transmission electron microscopy. The result provides a new preparation method of carbon nanoparticles through a ceramic process, which contrasts with previous physical methods applying electric arc discharge or electron irradiation in vacuum.

APA, Harvard, Vancouver, ISO, and other styles

13

Yan, Jiwang, Zhiyu Zhang, and Tsunemoto Kuriyagawa. "Effect of Nanoparticle Lubrication in Diamond Turning of Reaction-Bonded SiC." International Journal of Automation Technology 5, no. 3 (May 5, 2011): 307–12. http://dx.doi.org/10.20965/ijat.2011.p0307.

Full text

Abstract:

Lubrication is a key issue in diamond turning of hard materials. This paper explores the feasibility of nanoparticle lubrication in diamond turning of reaction-bonded SiC. Four types of nanoparticles were dispersed in lubricating grease and applied to a workpiece surface. Results showed that the type and concentration of dispersed nanoparticles significantly affected lubricating performance. Grease containing 10% Cu nanoparticles produced the highest surface quality and the lowest tool wear. Lubrication is discussed in terms of nanoparticle-induced solid lubricating film formation at the tool-workpiece interface.

APA, Harvard, Vancouver, ISO, and other styles

14

Wang, Zhao Hui, Yong Lin Kang, Hong Jin Zhao, and Yue Xu. "SiC Nanoparticles Reinforced Magnesium Alloys by Semisolid Process." Solid State Phenomena 116-117 (October 2006): 163–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.116-117.163.

Full text

Abstract:

In this paper, SiC nanoparticles reinforced AM60 alloys were fabricated by semisolid process with pretreatment of SiC nanoparticles. The microstructure, hardness and mechanical properties of the alloys have been investigated. The X-ray photoelectron spectroscopy (XPS) was also used for analyzing elements chemical status of the nanoparticles and the alloys. The microstructure, hardness and mechanical properties of SiC nanoparticles reinforced magnesium alloys are better than those of AM60 alloys without SiC nanoparticles addition. The results show that semisolid process was suitable for fabricating SiC nanoparticles reinforced magnesium alloys.

APA, Harvard, Vancouver, ISO, and other styles

15

Shahabaz, S. M., Pradeep Kumar Shetty, Nagaraja Shetty, Sathyashankara Sharma, S. Divakara Shetty, and Nithesh Naik. "Effect of Alumina and Silicon Carbide Nanoparticle-Infused Polymer Matrix on Mechanical Properties of Unidirectional Carbon Fiber-Reinforced Polymer." Journal of Composites Science 6, no. 12 (December 12, 2022): 381. http://dx.doi.org/10.3390/jcs6120381.

Full text

Abstract:

Unidirectional carbon fiber-reinforced polymer nanocomposites were developed by adding alumina (Al2O3) and silicon carbide (SiC) nanoparticles using ultrasonication and magnetic stirring. The uniform nanoparticle dispersions were examined with a field-emission scanning electron microscope. The nano-phase matrix was then utilized to fabricate the hybrid carbon fiber-reinforced polymer nanocomposites by hand lay-up and compression molding. The weight fractions selected for Al2O3 and SiC nanoparticles were determined based on improvements in mechanical properties. Accordingly, the hybrid nanocomposites were fabricated at weight fractions of 1, 1.5, 1.75, and 2 wt.% for Al2O3. Likewise, the weight fractions selected for SiC were 1, 1.25, 1.5, and 2 wt.%. At 1.75 wt.% Al2O3 nanoparticle loading, the flexural strength modulus improved by 31.76% and 37.08%, respectively. Additionally, the interlaminar shear and impact strength enhanced by 40.95% and 47.51%, respectively. For SiC nanocomposites, improvements in flexural strength (12.79%) and flexural modulus (9.59%) were accomplished at 1.25 wt.% nanoparticle loading. Interlaminar shear strength was enhanced by 34.27%, and maximum impact strength was improved by 30.45%. Effective particle interactions with polymeric chains of epoxy, crack deflection, and crack arresting were the micromechanics accountable for enhancing the mechanical properties of nanocomposites.

APA, Harvard, Vancouver, ISO, and other styles

16

Song, Xiaozong, Shundong Ge, Yanjiang Niu, and Dengwei Yan. "Effect of external electric field on ultraviolet-induced nanoparticle colloid jet machining." Nanotechnology 33, no. 21 (March 4, 2022): 215302. http://dx.doi.org/10.1088/1361-6528/ac55d0.

Full text

Abstract:

Abstract Electric field enhanced ultraviolet (UV)-induced nanoparticle colloid jet machining is proposed to improve the material removal efficiency of UV-induced nanoparticle colloid jet machining by applying an external electric field. The influences of TiO2 nanoparticle concentration, applied electric field voltage and pH value for the photocatalytic activity of the polishing slurry was investigated by orthogonal experiments. Terephthalic acid (TPA) was used as a fluorescent molecular probe to reflect the relative concentration of hydroxyl radical groups (·OH) in polishing slurry, which directly affects the material removal rate in the UV-induced nanoparticle colloid jet machining process. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and x-ray photoelectron spectroscopy (XPS) were employed to inspect the interaction variations between the TiO2 nanoparticles and the SiC workpiece surface. The SEM and XPS results exhibit that the external electric field can enhance the adsorption of TiO2 nanoparticles on the SiC workpiece surface, which can create more interfacial reaction active centers in the polishing process. The FT-IR spectra results indicate that TiO2 nanoparticles were chemically bonded to the SiC surface by oxygen-bridging atoms in Ti–O–Si bonds. The results of fixed-point polishing experiment show that due to the enhancement effect of external electric field on the photocatalytic activity of the polishing slurry, the material removal efficiency of electric field enhanced UV-induced nanoparticle colloid jet machining is 15% higher than that of UV-induced nanoparticle colloid jet machining, and is 28% higher than that of pure nanoparticle colloid jet machining. Atomic force microscope micromorphology show that an ultra-smooth SiC workpieces with surface roughness of Rms 0.84 nm (Ra 0.474 nm) has been obtained by electric field enhanced UV-induced nanoparticle colloid jet machining.

APA, Harvard, Vancouver, ISO, and other styles

17

N, Mohan Rajhu, Jayabalan C, Siva M, and Ramesh B. "A Novel Manufacturing Process for Nanosilica Carbide Reinforced Al2024 Matrix Composites." ECS Transactions 107, no. 1 (April 24, 2022): 4089–98. http://dx.doi.org/10.1149/10701.4089ecst.

Full text

Abstract:

Fabrication of SiC nanoparticle enhanced Al2024 composite material with near-net form SiC nano particles is discussed in this research using the flake powder metallurgy (PM) technique. Analysis of particle size and quantity of Silicon Carbide (SiC) nanoparticles in flake Al2024 matrix granules along with their effect on particle distribution, structure, relative compactness, and hardness were conducted. The granules Al2024 substrate particles were combined to 3 various size of some as Al2024 powders using a ball milling process. With intergranular wide enough to incorporate reinforcements, the Al2024 matrix powders were discovered to have flake-like microstructures with distributed SiC nanoparticles spread throughout. Hot pressed density raised as a result of the slight frictional forces among the thin flake elements. The rigidity of Aluminium Alloy 2021/Silicon carbide nanocomposites was employed to expand the size of matrix particles.

APA, Harvard, Vancouver, ISO, and other styles

18

Reza-E-Rabby, Md, Shaik Jeelani, and Vijaya K. Rangari. "Structural Analysis of Polyhedral Oligomeric Silsesquioxane Coated SiC Nanoparticles and Their Applications in Thermoset Polymers." Journal of Nanomaterials 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/894856.

Full text

Abstract:

The SiC nanoparticles (NPs) were sonochemically coated with OctaIsobutyl (OI) polyhedral oligomeric silsesquioxane (POSS) to create a compatible interface between particle and thermoset polymer. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) techniques were used to analyze the structure of OI-POSS coated SiC nanoparticles. These results revealed the formation of a covalent bonding between SiC and OI-POSS. The transmission electron microscopy (TEM) analysis of OI-POSS coated SiC nanoparticles has also shown the indication of attachment between these two nanoparticles. The OI-POSS coated SiC nanoparticles were further reinforced into a thermoset resin system in order to evaluate mechanical and thermal properties of nanocomposites. The flexural strength, modulus, and glass transition temperature were found to be enhanced while SiC and OI-POSS coated SiC were infused into epoxy system compared to those properties of neat epoxy resin.

APA, Harvard, Vancouver, ISO, and other styles

19

Konishi, Mikio. "Applying SiC Nanoparticles to Functional Ceramics for Semiconductor Manufacturing Process." Key Engineering Materials 403 (December 2008): 201–4. http://dx.doi.org/10.4028/www.scientific.net/kem.403.201.

Full text

Abstract:

SiC nanoparticles are synthesized by r.f. thermal plasma chemical vapour deposition using a chemical system of SiH4-C2H4-H2-Ar. The average particle size is about 30 nm, and its shape is nearly spherical. The product is β-SiC and high pure with total metal impurity of less than 1 ppm. High pure and fully densified SiC body can be made by hot-pressing the sub-micron sized SiC powder added SiC nanoparticles without any sintering additives. They show electrical conductivity, high thermal conductivity and better properties of thermal shock resistance and chemical resistance compared with conventional SiC ceramics. Furthermore, Al2O3-SiC nano-composite can be made by using SiC nanoparticles easily. These functional ceramics from nanoparticles are the most promising materials for the semiconductor manufacturing process. Up to now, various sintered parts, such as heater, susceptor, pulse heat tool, shower plate and electrical static chuck, etc. have been developed and widely used in the semiconductor industry.

APA, Harvard, Vancouver, ISO, and other styles

20

Kim, Daseul, Du-Yun Kim, Ji-Hye Kwon, and Nong-Moon Hwang. "Effects of the Size of Charged Nanoparticles on the Crystallinity of SiC Films Prepared by Hot Wire Chemical Vapor Deposition." Coatings 10, no. 8 (July 24, 2020): 726. http://dx.doi.org/10.3390/coatings10080726.

Full text

Abstract:

Non-classical crystallization suggests that crystals can grow with nanoparticles as a building block. In this case, the crystallization behavior depends on the size and charge of the nanoparticles. If charged nanoparticles (CNPs) are small enough, they become liquid-like and tend to undergo epitaxial recrystallization. Here, the size effect of SiC CNPs on film crystallinity was studied in the hot-wire chemical vapor deposition process. To do this, SiC nanoparticles were captured under different processing conditions—in this case, wire temperature, precursor concentration and the filament bias. Increasing the temperature of tungsten wires and decreasing the ratio of (SiH4 + CH4)/H2 reduced the size of the SiC nanoparticles. When the nanoparticles were small enough, an epitaxial SiC film approximately 100-nm-thick was grown, whereas larger nanoparticles produced polycrystalline SiC films. These results suggest that the size of the CNPs is an important process variable when growing films by means of non-classical crystallization.

APA, Harvard, Vancouver, ISO, and other styles

21

Xuan, Yang, Shian Jia, and Laurentiu Nastac. "Processing and Microstructure Characteristics of As-Cast A356 Alloys Manufactured via Ultrasonic Cavitation during Solidification." High Temperature Materials and Processes 36, no. 4 (April 1, 2017): 381–87. http://dx.doi.org/10.1515/htmp-2016-0147.

Full text

Abstract:

AbstractRecent studies have showed that the microstructure and mechanical properties of A356 alloy can be significantly improved when ultrasonic cavitation and solidification processing is used. This is because during the fabrication of A356 castings, ultrasonic cavitation processing plays an important role in degassing and refining the as-cast microstructure. In the present study, A356 alloy and Al2O3/SiC nanoparticles are used as the matrix alloy and the reinforcements, respectively. Nanoparticles are injected into the molten alloy and dispersed by ultrasonic cavitation. Ultrasonic cavitation was also applied during solidification of these nanocomposites. The microstructure and nanoparticle distribution of the cast samples have been investigated in detail. The current experimental results indicated that ultrasonic cavitation during solidification will greatly improve the microstructure of the samples. Al2O3 and SiC nanoparticle reinforced nanocomposites have different nanoparticle distributions in the matrix.

APA, Harvard, Vancouver, ISO, and other styles

22

Yong, Virginia, and H. Thomas Hahn. "Monodisperse SiC/vinyl ester nanocomposites: Dispersant formulation, synthesis, and characterization." Journal of Materials Research 24, no. 4 (April 2009): 1553–58. http://dx.doi.org/10.1557/jmr.2009.0176.

Full text

Abstract:

A novel dispersant “mono-2-(methacryloyloxy)ethyl succinate” was formulated for dispersing 30-nm SiC nanoparticles in vinyl ester resin. The eight carbon rule was used as the guideline to achieve a particle–particle separation of 20 to 60 nm for colloid stability. Fourier transform infrared spectroscopy was performed to characterize the SiC particle surfaces. Only a negligible amount of oxidized layer was observed; which illustrates that the SiC surface is basic. Thus, the Lewis base-Lewis acid reactions make the functional group –COOH an effective adsorbate to the SiC nanoparticle surface. The organofunctional group “methacrylates,” which exhibits the best wet strength with polyester copolymerizes with styrene monomers in the vinyl ester during cure. Hence, this novel dispersant also acts as an efficient coupling agent that reacts with both SiC and vinyl ester. The monolayer coverage dosage of 62 fractional wt% of the dispersant was used to attain the minimum filled resin viscosity. The multicomponent compositional imaging using atomic force microscopy confirmed the monodisperse SiC nanoparticles in vinyl ester. The 3 vol% SiC reinforced vinyl ester achieved a 75% increase in modulus, 42% increase in strength, and 75% increase in toughness as compared with the neat resin without nanofiller reinforcement.

APA, Harvard, Vancouver, ISO, and other styles

23

Gao, Y. H., Z. Zhang, L. S. Liao, and X. M. Bao. "A high-resolution electron microscopy study of blue-light emitting β–SiC nanoparticles in C+-implanted silicon." Journal of Materials Research 12, no. 6 (June 1997): 1640–45. http://dx.doi.org/10.1557/jmr.1997.0224.

Full text

Abstract:

A high-resolution electron microscopy study of β–SiC nanoparticles formed by C+-implantation of single crystal silicon with subsequent annealing has been carried out. The as-implanted sample had a trilayered structure, in which the surface layer, A, and the bottom layer, C, were crystalline but damaged, and the middle layer, B, was amorphous. After annealing this structure, β–SiC particles were formed throughout the trilayered structure but with different forms: a few epitaxial β–SiC nanoparticles in layers A and C, and more random nanoparticles in layer B. The β–SiC nanoparticles, in the size range 2–8 nm, should be responsible for the blue-emitting effect of the silicon-based porous β–SiC.

APA, Harvard, Vancouver, ISO, and other styles

24

HASSAN, TARIG A., VIJAYA K. RANGARI, FREDRIC BAKER, and SHAIK JEELANI. "SYNTHESIS OF HYBRID SiC/SiO2 NANOPARTICLES AND THEIR POLYMER NANOCOMPOSITES." International Journal of Nanoscience 12, no. 02 (April 2013): 1350008. http://dx.doi.org/10.1142/s0219581x13500087.

Full text

Abstract:

In the present investigation, silicon carbide (β-SiC) nanoparticles (~ 30 nm) were coated on silicon dioxide (SiO2) nanoparticles (~ 200 nm) using sonochemical method. The resultant hybrid nanoparticles were then infused into SC-15 epoxy resin to enhance the thermal and mechanical properties of SC-15 epoxy for structural application. To fabricate an epoxy-based nanocomposite containing SiC/SiO2 hybrid nanoparticles, we have opted a two-step process. In the first step, the silica nanoparticles were coated with SiC nanoparticles using high intensity ultrasonic irradiation. In a second step, 1 wt.% of as-prepared SiC/SiO2 particles were dispersed in epoxy part-A (diglycidylether of bisphenol A) using a high intensity ultrasound for 30 min at 5°C. The part-B (cycloaliphatic amine hardener) of the epoxy was then mixed with part-A- SiC/SiO2 mixture using a high-speed mechanical stirrer for 10 min. The SiC/SiO2 /epoxy resin mixture was cured at room temperature for 24 h. The SiC nanoparticles coating on SiO2 was characterized using X-ray diffraction (XRD) and high resolution transmission electron microscope (TEM). The as-prepared nanocomposite samples were characterized using thermo gravimetric analysis (TGA) and differential scanning calorimeter (DSC). Compression tests have been carried out for both nanocomposite and neat epoxy systems. The results indicated that 1 wt.% (SiC) + (SiO2) loading derived improvements in both thermal and mechanical properties when compared to the neat epoxy system.

APA, Harvard, Vancouver, ISO, and other styles

25

Sun, Baoxing, Ruobing Xie, Cun Yu, Cheng Li, and Hongjie Xu. "Structural characterization of SiC nanoparticles." Journal of Semiconductors 38, no. 10 (October 2017): 103002. http://dx.doi.org/10.1088/1674-4926/38/10/103002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Ferkel, H., and B. L. Mordike. "Magnesium strengthened by SiC nanoparticles." Materials Science and Engineering: A 298, no. 1-2 (January 2001): 193–99. http://dx.doi.org/10.1016/s0921-5093(00)01283-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Mu, Dikunqi, Zhen Zhang, Jiamiao Liang, Jun Wang, and Deliang Zhang. "Investigation of Microstructures and Mechanical Properties of SiC/AA2024 Nanocomposites Processed by Powder Metallurgy and T6 Heat Treatment." Materials 15, no. 10 (May 16, 2022): 3547. http://dx.doi.org/10.3390/ma15103547.

Full text

Abstract:

SiC/AA2024 nanocomposites with 1 and 5 vol.% SiC nanoparticles have been prepared by a powder metallurgy route involving high-energy ball-milling (HEBM), spark plasma sintering (SPS), and hot extrusion. The microstructures and mechanical properties of the nanocomposite samples before and after T6 heat treatment were investigated. The samples exhibited a bimodal microstructure with SiC nanoparticles being dispersed in it. With increasing the SiC nanoparticle content from 1 to 5 vol.%, the yield strength (YS) and ultimate tensile strength (UTS) increased and the elongation to fracture (El) slightly decreased. After T6 heat treatment, a simultaneous improvement of the strength and ductility was observed, with the YS, UTS, and El increasing from 413 MPa, 501 MPa, and 5.4% to 496 MPa, 572 MPa, and 6.7%, respectively, in the 1 vol.%SiC/AA2024 nanocomposite sample. Analysis of the deformation behavior shows that this improvement is likely caused by the increased density of geometrically necessary dislocations (GNDs) resulting from the bimodal microstructure. The dispersed intragranular Sʹ precipitates generated by the T6 heat treatment also make a contribution to the increase of strength and ductility by accumulating dislocations. It is feasible to realize simultaneous improvement of strength and ductility in the SiC/AA2024 nanocomposites via powder metallurgy and subsequent heat treatment.

APA, Harvard, Vancouver, ISO, and other styles

28

Mattli, Manohar Reddy, Penchal Reddy Matli, Adnan Khan, Rokaya Hamdy Abdelatty, Moinuddin Yusuf, Abdulla Al Ashraf, Rama Gopal Kotalo, and Rana Abdul Shakoor. "Study of Microstructural and Mechanical Properties of Al/SiC/TiO2 Hybrid Nanocomposites Developed by Microwave Sintering." Crystals 11, no. 9 (September 6, 2021): 1078. http://dx.doi.org/10.3390/cryst11091078.

Full text

Abstract:

Aluminum hybrid metal matrix nanocomposites (Al/SiC/TiO2) were synthesized through a microwave-assisted powder metallurgy process, and their evolved microstructure and mechanical properties were investigated. The Al/SiC/TiO2 hybrid nanocomposites were prepared by reinforcing aluminum (Al) matrix with a fixed amount of silicon carbide (SiC) nanoparticles (5 wt.%) and varying concentrations of titanium dioxide (TiO2) nanoparticles (3, 6, and 9 wt.%). The morphology results revealeda uniform distribution of SiC and TiO2 reinforcements in the aluminum matrix. An increase in the hardness and compressive strength of the Al/SiC/TiO2 hybrid nanocomposites was noticed with the increasein TiO2 nanoparticles. The Al/SiC/TiO2 hybrid nanocomposites that had an optimum amount of TiO2 nanoparticles (9 wt.%) showcased the best mechanical properties, with maximum increments of approximately 124%, 90%, and 23% of microhardness (83 ± 3 HV), respectively, yield strength (139 ± 8 MPa), and ultimate compression strength (375 ± 6 MPa) as compared to that of pure Al matrix. The Al/SiC/TiO2 hybrid nanocomposites exhibited the shear mode of fracture during their deformation process.

APA, Harvard, Vancouver, ISO, and other styles

29

Babic, Miroslav, Blaza Stojanovic, Dragan Dzunic, and Marko Pantic. "Micro/nanoscale structural, mechanical and tribological characterization of ZA-27/SiC nanocomposites." Journal of Composite Materials 54, no. 16 (December 3, 2019): 2113–29. http://dx.doi.org/10.1177/0021998319891766.

Full text

Abstract:

The structural, mechanical and tribological properties of ZA-27/SiC nanocomposites were investigated at micro/nanoscale. The nanocomposites with different volume fractions of nano-sized SiC particles were produced using the compocasting technique. The microstructure of nanocomposites was characterized with formation of SiC nano agglomerates, which were relatively uniformly distributed. The increase in SiC content contributed to the uniformity of their distribution. Also, the phenomenon of particle segregation in the form of particle-rich clusters, as well as particle-porosity clusters, was identified. The density level of composites decreased with the increase of the SiC content. The porosity followed a reverse trend. The tendency for formation of local particle-porosity clusters was the highest in ZA-27/1% SiC nanocomposite, causing the highest level of porosity. Increasing percentage of SiC content was followed by the increase in micro/nanohardness of the composites. The results of micro/nanoscale tribotests revealed that the reinforcing with SiC nanoparticles significantly improved wear and friction behavior of ZA-27 matrix alloy. The rate of improvement increased with the increase of SiC nanoparticle content, load, and sliding speed. The highest degree of changes corresponded to the change of the SiC nanoparticle content from 0 to 1 wt%. The further decrease of wear with SiC content (from 1 to 5 wt%) was almost linear. The different tribological behavior of tested ZA-27 matrix and ZA-27/SiC nanocomposites was influenced by differences of intensity of adhesion resulted in transferred layers of matrix material onto worn surfaces of Al2O3 ball counterpart. The intensity of adhesion significantly decreased with the increase of SiC nanoparticle content.

APA, Harvard, Vancouver, ISO, and other styles

30

Chen, Zhao, Rong Zheng Liu, Jia Xing Chang, and Ma Lin Liu. "Preparation and Characterization of SiC Nanoparticles for ATF-FCM." Solid State Phenomena 281 (August 2018): 22–27. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.22.

Full text

Abstract:

Accident Tolerant fuel (ATF) concept was put forward after the Fukushima accident. Among different kinds of ATF, Fully Ceramic Microencapsulated Fuels (FCM) have been paid more and more attention in recent years. SiC matrix is one of the important constituent parts in FCM fuel system, which is sintered from kinds of SiC powders. In this study, SiC nanoparticles were prepared by Fluidized Bed Chemical Vapor Deposition (FB-CVD) method using Hexamethyldisilane (HMDS) as precursor, aimed at reducing the sintering temperature and pressure of FCM-SiC matrix. Experiments of different temperatures with different argon gas ratios were carried out. It was found that good crystal SiC could be obtained from 850°C to 1250°C, under pure hydrogen or H2: Ar=15:1. Different H2 carrier gas flow rate tests were also conducted. With the increase of hydrogen flow rates, the SiC was transformed from 3C-SiC to other types, such as 6H or 15R, but no significant effect was found on particle shape. Based on the characterizations of XRD, SEM and TEM, the results showed the spherical SiC nanoparticles could be obtained as well as 20 nanometers in diameter at the condition of 1150°C, H2: Ar=15:1, under different hydrogen flow rates. Different hydrogen flow rates had little influence on the particle size of SiC nanoparticles.

APA, Harvard, Vancouver, ISO, and other styles

31

Li, Wen Zhen, Shi Ying Liu, Qiong Yuan Zhang, and Xue Zhu. "Untrasonic-Assisted Fabrication of SiC Nanoparticles Reinforced Aluminum Matrix Composites." Materials Science Forum 654-656 (June 2010): 990–93. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.990.

Full text

Abstract:

SiC nanoparticles reinforced ADC12 aluminium alloy nanocomposites were synthesized by mechanical stirring and high-intensity ultrasonic dispersion processing. SEM analysis results showed that SiC nanoparticles were dispersed and distributed very well in the alloy matrix. TEM results suggested that SiC bonds well with matrix without forming an intermediate phase. The strength and ductility of the nanocomposites were improved simultaneously.

APA, Harvard, Vancouver, ISO, and other styles

32

Isaković, Senad, Maja Đekić, Marija Tkalčević, Denis Boršćak, Ivana Periša, Sigrid Bernstorff, and Maja Mičetić. "Properties of SiC and Si3N4 Thin Films Containing Self-Assembled Gold Nanoparticles." Crystals 12, no. 10 (September 26, 2022): 1361. http://dx.doi.org/10.3390/cryst12101361.

Full text

Abstract:

The properties of semiconductor materials can be strongly affected by the addition of metallic nanoparticles. Here we investigate the properties of SiC+Au and Si3N4+Au thin films prepared by magnetron sputtering deposition followed by thermal annealing. The influence of gold addition on the optical and electrical properties is explored. We show the formation of self-assembled Au nanoparticles in SiC and Si3N4, with the size and arrangement properties determined by the deposition and annealing conditions. Both SiC- and Si3N4-based films show an increase in the overall absorption with increasing Au content, and its decrease with increasing annealing temperature. All films show the presence of surface plasmon resonance, whose peaks shift toward larger wavelengths with increasing Au nanoparticle size. The resistivity significantly drops with the Au content increase for both types of matrices, although the resistivity of Si3N4-based films is much higher. The incorporated quantity of Au in the host matrix was chosen in such a way to demonstrate that a huge range of optical and electrical characteristics is achievable. The materials are very interesting for application in opto-electronic devices.

APA, Harvard, Vancouver, ISO, and other styles

33

Li, Xiao Dan, Yu Chun Zhai, Jian Zhong Li, and Feng Qiu. "Effects of Surface Modification of SiC Nanoparticles and Preparation Process on Microstructures of SiCp/A6061 Alloy Matrix Composites." Advanced Materials Research 97-101 (March 2010): 1685–88. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1685.

Full text

Abstract:

SiC nanoparticles (40nm) reinforced metal matrix composites (MMCs) were made by a common stir casting technique in two different preparation processing routes. In the first route, the coated ceramic powder was prepared using electroless plating to coat SiC nanoparticles by Cu. In the second route, Cu and SiC nanoparticles were fully mixed by high energy ball milling, and then SiC nanoparticles were embedded in Cu to form a “jujube-cake” structure. In both cases the average particles size were 0.2μm. The SiC nanoparticles enhanced A6061 alloy matrix composites were made by stir casting, and as-cast microstructures were studied by means of optical microscopy (OM) and scanning electron microscopy (SEM). The results show that in the first route, the Cu off and the slagging reaction occurs to form a mixture at the upper part of the ingot by a vacuum melting and the ingot central also has a large number of pores, only the lower part of the ingot organization is uniform. The second route can make better uniform composites.

APA, Harvard, Vancouver, ISO, and other styles

34

Penther, Daniela, Claudia Fleck, Alireza Ghasemi, Ralf Riedel, and Sepideh Kamrani. "Development and Characterization of Mg-SiC Nanocomposite Powders Synthesized by Mechanical Milling." Key Engineering Materials 742 (July 2017): 165–72. http://dx.doi.org/10.4028/www.scientific.net/kem.742.165.

Full text

Abstract:

Magnesium powder in micron scale and various volume fractions of SiC particles with an average diameter of 50 nm were co-milled by a high energy planetary ball mill for up to 25 h to produce Mg-SiC nanocomposite powders. The milled Mg-SiC nanocomposite powders were characterized by scanning electron microscopy (SEM) and laser particle size analysis (PSA) to study morphological evolutions. Furthermore, XRD, TEM, EDAX and SEM analyses were performed to investigate the microstructure of the magnesium matrix and distribution of SiC-reinforcement. It was shown that with addition of and increase in SiC nanoparticle content, finer particles with narrower size distribution are obtained after mechanical milling. The morphology of these particles also became more equiaxed at shorter milling times. The microstructural observation revealed that the milling process ensured uniform distribution of SiC nanoparticles in the magnesium matrix even with a high volume fraction, up to 10 vol%.

APA, Harvard, Vancouver, ISO, and other styles

35

Salam, N., and M. A. Jaleel. "Fabrication of Wear Resistance Ni/SiC nano composite Coating by Electro co-deposition." Journal of Physics: Conference Series 2114, no. 1 (December 1, 2021): 012077. http://dx.doi.org/10.1088/1742-6596/2114/1/012077.

Full text

Abstract:

Abstract In this paper, we succeeded in obtaining a Ni/SiC nano composite coating using conventional electro deposition by adding different amount of SiC nanoparticles to a nickel-watt bath to be co-deposited. The effect of electro deposition conditions was studied by changing the amount of SiC nanoparticles in the nano composite, and the deposition current density which affects on the participation of SiC nanoparticles in the coating. The morphology and mechanical properties of the electrodeposited nano-composite were studied. The wear behavior of the nano-composite coatings was evaluated on a ball-on-disk test. It was found that the increased micro hardness and wear resistance of the nano-composite coatings increased with increasing content of the SiC nano-particulate in bath.

APA, Harvard, Vancouver, ISO, and other styles

36

Hoseini, M., G. Dini, and M. Bahadori. "Dielectric strength and mechanical properties of epoxy resin filled with self-propagating high-temperature synthesized Al2O3/SiC nanoparticles." Journal of Composite Materials 54, no. 17 (December 10, 2019): 2231–43. http://dx.doi.org/10.1177/0021998319891202.

Full text

Abstract:

In this study, the rice husk as a source of silica was used to synthesize the Al2O3/SiC composite via the self-propagation high-temperature synthesis (SHS) process. Then, the particle size of the synthesized product was reduced to the nanoscale using a planetary ball mill. Finally, different amounts (5, 10, and 15 wt.%) of Al2O3/SiC nanoparticles were incorporated into an epoxy resin in order to improve the mechanical properties and the dielectric strength of fabricated epoxy-based composites. The results indicated that the Al2O3/SiC composite was successfully synthesized by the SHS process from a mixture of the rice husk ash, Al, and carbon black powders as starting materials. The average size of the synthesized Al2O3/SiC particles decreased to 80 nm after 12-h ball milling. Also, the mechanical properties of the fabricated epoxy-based composite samples were improved with the addition of Al2O3/SiC nanoparticles in the investigated range in comparison with the pure epoxy sample. Additionally, the overall dielectric strength of the fabricated epoxy-based composites containing 5–15 wt.% of Al2O3/SiC nanoparticles was higher than that of the pure epoxy. These results were interpreted in terms of the synthesis mechanism of Al2O3/SiC composite via the SHS process, the rice husk ash structure, the interfacial bonding between the polymer chains and the surface of nanoparticles, and the insulation nature of the synthesized nanoparticles.

APA, Harvard, Vancouver, ISO, and other styles

37

Rangari, Vijaya K., M. Yousuf, and Shaik Jeelani. "Influence of SiC/Si3N4 Hybrid Nanoparticles on Polymer Tensile Properties." Journal of Composites 2013 (October 31, 2013): 1–11. http://dx.doi.org/10.1155/2013/462914.

Full text

Abstract:

Nanostructured silicon carbide (SiC)/silicon nitride (Si3N4) hybrid nanoparticles exhibit a high-potential for reinforcement of polymers. In the present investigation, silicon carbide (β-SiC) nanoparticles (~30 nm) were sonochemically coated on acicular silicon nitride (~100 nm × 800 nm) particles to increase the thermal and mechanical properties of Nylon-6 nanocomposite fibers. To produce Nylon-6/(SiC/Si3N4) nanocomposite fibers, we have followed a two-step process. In the first step, SiC nanoparticles were coated on Si3N4 nanorods using a sonochemical method and Cetyltrimethylammonium Bromide surfactant. In the second step, the SiC coated Si3N4 hybrid nanoparticles were blended with Nylon-6 polymer and extruded in the form of nanocomposite polymer fibers. The nanocomposite fibers were uniformly stretched and stabilized using a two-set Godet roll machine. The diameters of the extruded neat Nylon-6 and SiC/Si3N4/Nylon-6 nanocomposite fibers were measured using a scanning electron microscope and then tested for their tensile and thermal properties. These results were compared with the neat Nylon-6 polymer fibers. These results clearly indicate that the as-prepared nanocomposite polymer fibers are much higher in tensile strength (242%) and Young’s modulus (716%) as compared to the neat polymer fibers.

APA, Harvard, Vancouver, ISO, and other styles

38

Nabati, Maryam, Hassan Abdoos, and Hamidreza Mohammadian Semnani. "The effect of SiC nanoparticles and sintering temperature on the structural and wear properties of Cu–MWCNTs–SiC hybrid nanocomposites." International Journal of Materials Research 112, no. 1 (January 1, 2021): 25–34. http://dx.doi.org/10.1515/ijmr-2020-7753.

Full text

Abstract:

Abstract SiC nanoparticles play an important role in Cu–MWCNTs nanocomposites. So far, the effect of SiC volume fraction has not been considered on the properties of Cu–MWCNTs–SiC hybrid nanocomposites. Copper-based hybrid nanocomposites with 2 vol.% carbon nanotubes and 1–3 vol.% SiC nanoparticles were prepared via powder metallurgy. The composite powders were compacted and then sintered at 850, 900 and 950 °C for 1 h. Increasing the volume fraction of SiC nanoparticles restricts the grain growth, decreases the friction coefficient, and increases the hardness and wear resistance of prepared nanocomposites. The coefficient of friction and wear rate of Cu–MWCNTs–SiC hybrid nanocomposites decreased with increasing SiC content. Nanocomposites sintered at 900 °C exhibited higher hardness and wear resistance compared to other samples. The highest hardness and wear resistance were related to the Cu-2 vol.% MWCNTs-3 vol.%SiC hybrid nanocomposite sintered at 900 °C, which shows approximately 24 and 78% improvement over the pure copper specimen, respectively. Wear resistance and hardness were reduced for samples sintered at 950 °C.

APA, Harvard, Vancouver, ISO, and other styles

39

Guo, Wei, Qu-Dong Wang, Wen-Zhen Li, Hao Zhou, Li Zhang, and Wen-Jun Liao. "Enhanced microstructure homogeneity and mechanical properties of AZ91–SiC nanocomposites by cyclic closed-die forging." Journal of Composite Materials 51, no. 5 (July 28, 2016): 681–86. http://dx.doi.org/10.1177/0021998316651126.

Full text

Abstract:

The microstructure and mechanical properties of AZ91–SiC nanocomposites processed by cyclic closed-die forging were investigated. The results showed that much finer grain size and more homogeneous distribution of Mg17Al12 phase and SiC nanoparticles were obtained along with significant improvement in strength and elongation after five passes. During cyclic closed-die forging processing, the agglomeration of nanoparticles disintegrated through kneading effect induced by intense matrix flow, and the nano-sized SiC particles were dispersed uniformly into the matrix. However, a few SiC clusters still existed due to the high surface energy of nanoparticles. Properties enhancement of the composites was mainly attributed to Hall–Petch effect and Orowan strengthening.

APA, Harvard, Vancouver, ISO, and other styles

40

Li, Xianjia, Zhi Li, Rui Zhou, Bin Wang, Yu Wang, Husheng Li, Tao He, et al. "Improvement of Structures and Properties of Al2O3 Coating Prepared by Cathode Plasma Electrolytic Deposition by Incorporating SiC Nanoparticles." Coatings 12, no. 5 (April 24, 2022): 580. http://dx.doi.org/10.3390/coatings12050580.

Full text

Abstract:

A serious issue in the preparation of Al2O3 coatings by cathode plasma electrolytic deposition (CPED) is that the coatings have a porous structure, which is detrimental to their protective performance. Therefore, to address this problem, SiC nanoparticles are incorporated into the Al2O3 coating in this study. A series of Al2O3–SiC composite coatings are efficaciously prepared on the surface of 316L stainless steel by CPED. The microstructures, compositions and phase components of the composite coatings are characterized; the electrochemical corrosion resistance and tribological behavior are evaluated; and the mechanism of SiC nanoparticles in the coating formation process is discussed in detail. The results indicate that the Al2O3 coating prepared by CPED consists of α-Al2O3 and γ-Al2O3, and the former is the main crystalline phase. With the incorporation of SiC nanoparticles in the coating, the content of α-Al2O3 gradually decreases, almost disappearing, accompanied by an increase in γ-Al2O3 as the main crystalline phase. The incorporation of SiC nanoparticles significantly reduces the surface irregularity and roughness of Al2O3 coatings and remarkably improves the corrosion resistance and wear resistance of the Al2O3 coatings. The improvement in corrosion resistance and anti-wear properties can be explained by the fact that the SiC nanoparticles effectively weaken electrical breakdown and increase the compactness of the coatings.

APA, Harvard, Vancouver, ISO, and other styles

41

Li, Xianjia, Zhi Li, Rui Zhou, Bin Wang, Yu Wang, Husheng Li, Tao He, et al. "Improvement of Structures and Properties of Al2O3 Coating Prepared by Cathode Plasma Electrolytic Deposition by Incorporating SiC Nanoparticles." Coatings 12, no. 5 (April 24, 2022): 580. http://dx.doi.org/10.3390/coatings12050580.

Full text

Abstract:

A serious issue in the preparation of Al2O3 coatings by cathode plasma electrolytic deposition (CPED) is that the coatings have a porous structure, which is detrimental to their protective performance. Therefore, to address this problem, SiC nanoparticles are incorporated into the Al2O3 coating in this study. A series of Al2O3–SiC composite coatings are efficaciously prepared on the surface of 316L stainless steel by CPED. The microstructures, compositions and phase components of the composite coatings are characterized; the electrochemical corrosion resistance and tribological behavior are evaluated; and the mechanism of SiC nanoparticles in the coating formation process is discussed in detail. The results indicate that the Al2O3 coating prepared by CPED consists of α-Al2O3 and γ-Al2O3, and the former is the main crystalline phase. With the incorporation of SiC nanoparticles in the coating, the content of α-Al2O3 gradually decreases, almost disappearing, accompanied by an increase in γ-Al2O3 as the main crystalline phase. The incorporation of SiC nanoparticles significantly reduces the surface irregularity and roughness of Al2O3 coatings and remarkably improves the corrosion resistance and wear resistance of the Al2O3 coatings. The improvement in corrosion resistance and anti-wear properties can be explained by the fact that the SiC nanoparticles effectively weaken electrical breakdown and increase the compactness of the coatings.

APA, Harvard, Vancouver, ISO, and other styles

42

Rashid, Farhan Lafta, Aseel Hadi, Ammar Ali Abid, and Ahmed Hashim. "Solar energy storage and release application of water-phase change material- (SnO2-TaC) and (SnO2–SiC) nanoparticles system." International Journal of Advances in Applied Sciences 8, no. 2 (June 1, 2019): 154. http://dx.doi.org/10.11591/ijaas.v8.i2.pp154-156.

Full text

Abstract:

The thermal energy storage and release application of water- phase change material- (SnO2-TaC) and (SnO2–SiC) nanoparticles system has been investigated for cooling and heating applications. The water - polyethylene glycolwith (SnO2-TaC) and (SnO2–SiC) nanoparticles have been used. The results showed that the melting and solidification times for storage and release of thermal energy of water - polyethylene glycoldecrease with increase in(SnO2-TaC) and (SnO2–SiC) nanoparticles concentrations. The melting and solidification times decrease with increasing of TaC nanoparticles concentrations to water-polyethylene glycol/SnO2nanofluidand SiC nanoparticles concentrations to water-polyethylene glycol/SnO2nanofluid.

APA, Harvard, Vancouver, ISO, and other styles

43

de Cicco, Michael P., and John H. Perepezko. "Catalytic Effect of Nanoparticles on Primary and Secondary Phase Nucleation." Materials Science Forum 765 (July 2013): 250–54. http://dx.doi.org/10.4028/www.scientific.net/msf.765.250.

Full text

Abstract:

Nanoparticles were shown to catalyze nucleation of primary and secondary phases in metal matrix nanocomposites (MMNCs). This catalysis is important as it contributes to the mechanical property enhancement in the MMNCs. Primary aluminium grain refinement was demonstrated in A356 matrix nanocomposites. Various types and sizes of nanoparticles (SiC, TiC, γ-Al2O3; 10-96 nm) were used to make these MMNCs and in all cases the MMNCs had smaller, more equiaxed grains compared to the reference A356. Using the droplet emulsion technique, undercoolings were shown to be significantly reduced. Undercoolings in the MMNCs were in good general agreement with the undercooling necessary for free growth, suggesting the applicability of this model to nucleation on nanoscale catalysts. Secondary phase nucleation catalysis was demonstrated in a zinc alloy AC43A MMNC and a binary Mg-4Zn MMNC. In AC43A, secondary phase nucleation was catalyzed with the addition of various nanoparticles (TiC, SiC, γ-Al2O3). The secondary phase nucleation catalysis in AC43A coincided with ductility enhancement. In Mg-4Zn, SiC nanoparticle addition changed the secondary phases that formed. MgZn2 was formed in the MMNC at relatively high temperatures consuming the Zn and reducing the amount of the low temperature Mg2Zn3 phase that formed in the reference alloy. The change in secondary phase formation coincided with significant enhancement in strength and ductility.

APA, Harvard, Vancouver, ISO, and other styles

44

Li, Jiayuan, Jing Wang, Dunfeng Gao, Xingyun Li, Shu Miao, Guoxiong Wang, and Xinhe Bao. "Silicon carbide-supported iron nanoparticles encapsulated in nitrogen-doped carbon for oxygen reduction reaction." Catalysis Science & Technology 6, no. 9 (2016): 2949–54. http://dx.doi.org/10.1039/c5cy01539a.

Full text

Abstract:

Iron nanoparticles encapsulated in nitrogen-doped carbon (Fe@N–C) supported on a SiC core with a derived nitrogen-doped carbon shell (SiC@N–C) show much higher activity for oxygen reduction reaction than SiC, SiC@N–C and SiC-supported Fe₃Si in alkaline medium.

APA, Harvard, Vancouver, ISO, and other styles

45

Senthilkumar, D. "Influence of Silicon Carbide Nanopowder in R134a Refrigerant Used in Vapor Compression Refrigeration System." International Journal of Air-Conditioning and Refrigeration 25, no. 01 (March 2017): 1750007. http://dx.doi.org/10.1142/s2010132517500079.

Full text

Abstract:

This paper deals with the influence of silicon carbide (SiC) nanopowder in R134 a refrigerant used in a vapor compression refrigeration system. The performance study was done by mixing a SiC nanopowder in R134a refrigerant. The energy consumption of the R134a refrigerant with SiC nanoparticles mixture saves 20% energy with 0.25% mass fraction of SiC nanoparticles when compared to the R134a system. The COP of the refrigerant R134a system is 1.24 whereas COP for R134a-SiC nanopowder is 1.81. The SiC nanopowder is cryogenically treated at [Formula: see text]C for 24 h and the COP is found out. The results show that the COP of R134a-SiC nanopowder and R134a-cryo SiC (cryogenically treated silicon carbide nanopowder) is increased when compared to the R134a conventional refrigeration system.

APA, Harvard, Vancouver, ISO, and other styles

46

Subramani, Murugan, Song-Jeng Huang, and Konstantin Borodianskiy. "Effect of SiC Nanoparticles on AZ31 Magnesium Alloy." Materials 15, no. 3 (January 28, 2022): 1004. http://dx.doi.org/10.3390/ma15031004.

Full text

Abstract:

Magnesium alloys are attractive for the production of lightweight parts in modern automobile and aerospace industries due to their advanced properties. Their mechanical properties are usually enhanced by the incorporation with reinforcement particles. In the current study, reinforced AZ31 magnesium alloy was fabricated through the addition of bulk Al and the incorporation of SiC nanoparticles using a stir casting process to obtain AZ31-SiC nanocomposites. Scanning electron microscope (SEM) investigations revealed the formation of Mg17Al12 lamellar intermetallic structures and SiC clusters in the nanocomposites. Energy dispersive spectroscopy (EDS) detected the uniform distribution of SiC nanoparticles in the AZ31-SiC nanocomposites. Enhancements in hardness and yield strength (YS) were detected in the fabricated nanocomposites. This behavior was referred to a joint strengthening mechanisms which showed matrix-reinforcement coefficient of thermal expansion (CTE) and elastic modulus mismatches, Orowan strengthening, and load transfer mechanism. The mechanical properties and wear resistance were gradually increased with an increase in SiC content in the nanocomposite. The maximum values were obtained from nanocomposites containing 1 wt% of SiC (AZ31-1SiC). AZ31-1SiC nanocomposite YS and hardness were improved by 27% and 30%, respectively, compared to AZ31 alloy. This nanocomposite also exhibited the highest wear resistance; its wear mass loss and depth of the worn surface decreased by 26% and 15%, respectively, compared to AZ31 alloy.

APA, Harvard, Vancouver, ISO, and other styles

47

Liu, Jing, Rong Wu, Jin Li, Yan Fei Sun, and Ji Kang Jian. "Synthesis of Silicon Carbide Nanoparticles from Carbon Nanotubes." Advanced Materials Research 602-604 (December 2012): 183–86. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.183.

Full text

Abstract:

In this paper, we report the synthesis of cubic silicon carbide (3C-SiC) nanoparticles by direction reaction of silicon powders and carbon nanotubes. The as-prepared SiC nanoparticles were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and Raman scattering at room temperature. The possible growth mechanism is proposed.

APA, Harvard, Vancouver, ISO, and other styles

48

Poovazhgan, L., S. C. Amith, A. Kali Avudaiappan, and P. Haripriya. "Influence of Particle Feeding Methods on Processing the AA6061/SiC Metal Matrix Nanocomposites." Applied Mechanics and Materials 787 (August 2015): 648–52. http://dx.doi.org/10.4028/www.scientific.net/amm.787.648.

Full text

Abstract:

Aluminum alloy 6061 reinforced with 1.0 weight percentage of Silicon Carbide (SiC) nanoparticles were fabricated using the novel ultrasonic cavitation assisted stir casting approach. Three types of nanoparticle feeding mechanisms were attempted for fabricating the metal matrix nanocomposites. The fabricated nanocomposites were subjected to tension test, hardness test and scanning electron microscopic analysis. From the tested results, it was found that feeding the particles using Al foils followed by ultrasonic cavitation proved as a suitable method for obtaining the better mechanical properties of the fabricated nanocomposites. Scanning electron microscopy analysis confirmed the uniform dispersion SiC in Al matrix by capsule feeding method. Energy dispersive spectroscopy validates the incorporation of SiC in Al matrix.

APA, Harvard, Vancouver, ISO, and other styles

49

He, Kang Li, Ning Liu, Rui Yuan Zheng, Wang Yi Liu, Bing Li, and Ze Yong Wang. "Synthesis and Characterization of SiC Nanoparticles with Lamellar Structures from Taixi Coal." Advanced Materials Research 785-786 (September 2013): 488–92. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.488.

Full text

Abstract:

A simple and cost effective method was reported for the synthesis of β-SiC nanoparticles with differernt morphologies using Taixi coal as carbon source and Fe (NO3)3·9H2O, Co (NO3)2·6H2O and NiCO3·2Ni (OH)2·4H2O as additives, respectively. The structures and morphologies were characterized by XRD, FTIR, BET and SEM. The results show that SiC nanoparticles with lamellar structures were successfully synthesized at 1450 °C with NiCO3·2Ni (OH)2·4H2O as an additive which are very scarce to our knowledge. whats more, the formation mechanism of lamellar structures SiC nanoparticles were also discussed.

APA, Harvard, Vancouver, ISO, and other styles

50

Zhou, Xia, Depeng Su, Chengwei Wu, and Liming Liu. "Tensile Mechanical Properties and Strengthening Mechanism of Hybrid Carbon Nanotube and Silicon Carbide Nanoparticle-Reinforced Magnesium Alloy Composites." Journal of Nanomaterials 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/851862.

Full text

Abstract:

AZ91 magnesium alloy hybrid composites reinforced with different hybrid ratios of carbon nanotubes (CNTs) and silicon carbide (SiC) nanoparticulates were fabricated by semisolid stirring assisted ultrasonic cavitation. The results showed that grains of the matrix in the AZ91/(CNT + SiC) composites were obviously refined after adding hybrid CNTs and SiC nanoparticles to the AZ91 alloy, and the room-temperature mechanical properties of AZ91/(CNT + SiC) hybrid composites were improved comparing with the unreinforced AZ91 matrix. In addition, the tensile mechanical properties of the AZ91 alloy-based hybrid composites were considerably improved at the mass hybrid ratio of 7 : 3 for CNTs and SiC nanoparticles; in particular, the tensile and yield strength were increased, respectively, by about 45 and 55% after gravity permanent mould casting. The reason for an increase in the room-temperature strength of the hybrid composites should be mainly attributable to the larger hybrid ratio of CNTs and SiC nanoparticles, the coefficient of thermal expansion (CTE) mismatch between matrix and hybrid reinforcements, the dispersive strengthening effects (Orowan strengthening), and the grain refining (Hall-Petch effect).

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'SiC nanoparticles'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles