Zeitschriftenartikel: „Composite materials C/C“

1

Okino, Fujio, und Michiya Ota. „Nano-C/C composite materials“. TANSO 2006, Nr. 223 (2006): 206–14. http://dx.doi.org/10.7209/tanso.2006.206.

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2

Kimura, Shiushichi, und Eiichi Yasuda. „Carbon fiber reinforced carbon composite materials C/C composite.“ Bulletin of the Japan Institute of Metals 24, Nr. 5 (1985): 403–9. http://dx.doi.org/10.2320/materia1962.24.403.

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3

AWASTHI, SHRIKANT, und JERRY L. WOOD. „C/C Composite Materials for Aircraft Brakes“. Advanced Ceramic Materials 3, Nr. 5 (September 1988): 449–51. http://dx.doi.org/10.1111/j.1551-2916.1988.tb00254.x.

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4

Yevtushenko, Aleksander, Michal Kuciej und Katarzyna Topczewska. „Frictional Heating during Braking of the C/C Composite Disc“. Materials 13, Nr. 12 (12.06.2020): 2691. http://dx.doi.org/10.3390/ma13122691.

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An analytical model to determine temperature in a single brake disc of multi-disc system is proposed. The model considers the convective cooling on the lateral surfaces of the disc and structure of composite friction material. Calculations were carried out for a disc made of carbon friction composites material Termar-ADF. The influence of heat transfer with environment, length of bundles with fibers, and concentration of fibers in composite on the temperature of the disc was investigated during single braking with constant deceleration.

5

Evdokimov, S. A., S. St Solntsev, G. V. Yermakova und D. I. Davletchin. „High-temperature protective coating for C–C composite materials“. «Aviation Materials and Technologies», Nr. 3 (2016): 82–87. http://dx.doi.org/10.18577/2071-9140-2016-0-3-82-87.

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6

Zhu, Dong Mei, Hong Na Du, Fa Luo und Wan Cheng Zhou. „Preparation and Mechanical Properties of C/C-SiC Composites“. Materials Science Forum 546-549 (Mai 2007): 1501–4. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1501.

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Porous C/C composite with certain porosity prepared by Chemical vapor infiltration (CVI) was chosen as the preforms to develop the C/C-SiC composites through precursor infiltration and pyrolysis(PIP), using PCS (polycarbosilane) as the precursor and divinylbenzene as solvent and cross-linking reagent for PCS. The effect of the infiltration solution with different PCS/DVB ratio on the final density, microstructure, and mechanical properties of composites was investigated and the proper PCS/DVB ratio to prepare the C/C-SiC composites was suggested. The experimental results showed that the final densities and the mechanical properties of the composites were close related to the PCS/DVB ratio. Higher PCS/DVB ratio resulted in higher final density and better mechanical properties, but not the highest PCS/DVB ratio could get the best mechanical properties. The main reason is that too high PCS/DVB ratio will make the infiltration process become difficult and lead to the formation of lots of pores in the final composite, at last lowers the mechanical properties. It is believed that the 50% PCS content is proper to prepare the C/C-SiC composites. The composite from 50% PCS infiltration solution could get the final density of1.696g/cm3, the flexural strength of 171Mpa, and shearing strength of 21.6Mpa, which are the best mechanical results among the obtained materials.

7

Kim, Byung-Kook, Dong-Gap Shin, Chang-Lae Kim, Byeong-Choon Goo und Dae-Eun Kim. „Tribological Characteristics of C/C-SiC-Cu Composite and Al/SiC Composite Materials under Various Contact Conditions“. Transactions of the Korean Society of Mechanical Engineers A 41, Nr. 1 (01.01.2017): 21–30. http://dx.doi.org/10.3795/ksme-a.2017.41.1.021.

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8

Wielage, Bernhard, Daisy Weber, Tobias Müller und Heike Steger. „Thermo-Mechanical Monitoring of Composite Materials during the Pyrolysis of C/C Composites“. Key Engineering Materials 425 (Januar 2010): 95–105. http://dx.doi.org/10.4028/www.scientific.net/kem.425.95.

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Conventional mechanical and structural properties allow to describe the complete composite material. They do, however, not describe the reaction during the pyrolysis process. The dynamic mechanical thermal analysis (DMTA) is a technique which is used to characterize materials. In particular, the DMTA method is used to observe the viscoelastic nature of polymers. Another interesting application area of the DMTA is the simulation of pyrolysis experiments to obtain carbon/carbon composites (C/C composites). The pyrolysis process of carbon-fibre-reinforced plastics (CFRP) was performed by means of inert gas (Ar, ambient pressure) under a defined time-temperature profile or alternatively approached by short time sweeps in a DMTA. So the temperature dependence of the elastic modulus (E-modulus) and of the internal damping (tan δ) are determined starting from the cured carbon-fibre-reinforced plastic to the transformed C/C composites. The analyses were applied for different matrix resins. The shown method improves the access to usually hidden mechanical and structural properties and requires further investigation of the entire polymerization and pyrolysis processes.

9

Krnel, Kristoffer, Zmago Stadler und Tomaž Kosmač. „The Influence of SiC Nano-Precipitates on the Interface Structure in C/C-SiC Composites“. Advances in Science and Technology 50 (Oktober 2006): 46–50. http://dx.doi.org/10.4028/www.scientific.net/ast.50.46.

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The goal of our research is to develop a carbon-carbon-silicon carbide composite that will unite high fracture toughness of carbon-carbon composite with good oxidation and abrasion resistance and good thermal conductivity of silicon carbide. That can be achieved by the preparation of functionally graded C/C-SiC composites. For the production of C/C-SiC composites with a gradient structure of the ceramic matrix – from a carbon matrix in the core to a SiC matrix on the surface new materials based on C/C composite with SiC nano-particles dispersed in the matrix were produced. Since for the thermo-mechanical properties of such materials, the interface between the carbon fibres and the matrix phase is crucial, we studied the influence of SiC precipitation from the matrix phase on the interface structure and the mechanical properties of C/C-SiC composites. The results show that SiC nano-particels are precipitating around the carbon fibres influencing the interface structure and consequently also the mechanical properties.

10

Wang, Jing, Jun Cong Wei, Chun Mei Wang und Qing Qing Zhao. „SiO/C Composite Materials for Lithium-Ion Secondary Batteries“. Advanced Materials Research 750-752 (August 2013): 1117–20. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.1117.

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The SiO/C composite materials were prepared via a solution route and subsequent thermal treatment. The effects of carbon source on the particle morphology of composite, the graphitization degree of carbon component and the electrochemical performance of the prepared SiO/C composites were investigated by scanning electron microscopy (SEM), Raman spectrometer and electrochemical charge/discharge tests. The results reveal that the SiO/C composite synthesized with the epoxy resin as carbon source exhibits the higher graphitic degree and higher reversible specific capacity (~690 mAhg-1) and excellent cycling stability.

11

Chen, Wang. „Numerical analyses of ablative behavior of C/C composite materials“. International Journal of Heat and Mass Transfer 95 (April 2016): 720–26. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.12.031.

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12

Bui, Thi Hang, und Ha Thang Doan. „Fabrication and properties of Fe3O4/C composite materials“. Ministry of Science and Technology, Vietnam 65 (25.11.2023): 52–56. http://dx.doi.org/10.31276/vjst.65(11).52-56.

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Climate change is currently one of the most serious problems facing the world. In this study, Fe3O4 powder was used as electrode active material, nanocarbon was used as an additive to fabricate Fe3O4/C composites applying for energy storage systems. The size and morphology of iron oxide and nanocarbon were investigated by scanning electron microscopy. The effects of the additive, the content of the electrode components on the electrochemical properties of the Fe3O4/C composite electrode have been studied by cyclic voltammetry. The results showed that the content of the electrode components strongly affects the electrochemical characteristics of the electrode. The important role of the carbon additive in the Fe3O4/C composite electrode was confirmed: Nanocarbon increases the electrical conductivity of the electrode thereby enhancing the redox reaction rate of iron. The positive effect of the K2S additive in electrolyte was demonstrated by increased redox reaction rate of iron, improved cyclability of Fe3O4, reduced hydrogen evolution, and thus increased the discharge capacity of Fe3O4/C.

13

Lu, Fei, Liang Lu, Jian Liu, Xianjuan Pang und Chenfei Song. „Tribological Properties and Wear Mechanism of C/C Composite Applied in Finger Seal“. Machines 11, Nr. 2 (28.01.2023): 176. http://dx.doi.org/10.3390/machines11020176.

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The application of C/C composites in finger seals can effectively solve the problem of seal wear due to its excellent tribological and mechanical behaviors. However, the designable characteristics of composites, such as the density and orientation of fabric on the friction plane, have a very important influence on the tribological properties and service life of sealing materials. In order to obtain a better material design scheme for the C/C composite on the finger seal, it is necessary to conduct research on the tribological properties and wear mechanism of the C/C composite based on the working conditions of the finger seal. Therefore, a reciprocating tribo-tester was used to conduct the test by abrading the C/C composite disk with a pin made of 1045,080M46. The effects of material density, fabric orientation, and load and sliding velocity on the tribological properties and wear mechanism of the C/C composite were studied. The results show that the friction coefficient and wear rate of the composite with a perpendicular orientation (non-woven cloth perpendicular to the friction plane) were lower than those with a parallel orientation (non-woven cloth parallel to the friction plane). The tribological properties with higher density are better than those of material with a lower density. The friction coefficient of low-density material increases with the load, whereas it decreases gradually with high-density material. The wear rate increases with the load for two-density materials. With the increase in the sliding velocity, the friction coefficient decreases. The wear rate of low-density material decreases significantly, whereas it changes little with high-density material. The influence of the sliding velocity on the friction and wear properties of the C/C composite is greater than that of the load. This study provides a feasible material design idea for effectively alleviating the wear of finger seals.

14

Ruan, Chenglin, Junpeng Lv, Liping Zu, Lisheng Liu und Hai Mei. „Prediction of Thermo-Mechanical Properties of 8-Harness Satin-Woven C/C Composites by Asymptotic Homogenization“. Materials 17, Nr. 6 (11.03.2024): 1284. http://dx.doi.org/10.3390/ma17061284.

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The elasticity matrix and the coefficients of thermal expansion (CTEs) of 8-harness satin-woven (8HS) carbon-fiber-reinforced carbon matrix (C/C) composites at high temperatures were obtained by the asymptotic homogenization method (AHM) and finite element method (FEM). By analyzing the microstructure of the 8HS C/C composites, a representative volume element (RVE) model considering a braided structure was established. The effects of the temperature and component volume fraction on the elasticity matrix and CTEs of the composites were investigated. The sensitivity of model parameters, including the size of RVE model and mesh sensitivity, were studied. The optimal calculation model was employed. In addition, the effects of the 4HS methods and 8HS methods on the elastic constants of the composites were compared. The temperature and variation in the carbon fiber volume fraction were found to have a significant impact on the elasticity matrix and CTEs of composite materials. At the same volume fraction of carbon fibers, some elastic coefficients of the 4HS composite material were slightly lower than those of 8HS composite material. This research affords a computational strategy for the accurate prediction of the themo-mechanical properties of satin-woven C/C composites.

15

Li, Shengnan, Dong Du, Lei Zhang, Xiaoguo Song, Yongguang Zheng, Guoqin Huang und Weimin Long. „A review on filler materials for brazing of carbon-carbon composites“. REVIEWS ON ADVANCED MATERIALS SCIENCE 60, Nr. 1 (01.01.2021): 92–111. http://dx.doi.org/10.1515/rams-2021-0007.

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Abstract It is needed to join C/C composite to other materials since its individual use is limited. Brazing is a method to join C/C composite that has been studied most, maturest and most widely used in recent decades. The quality of a brazed joint is largely determined by the intermediate layer material. It is significant to choose filler materials reasonably. C/C composite is difficult to be wetted by common brazing filler materials. Moreover, there is a large difference in the coefficient of thermal expansion between C/C composite and metals. At present, there is no brazing filler alloy exclusively recommended for commercial C/C composites and metal brazing. Usually, active elements are added into filler metals to improve the wettability of them on C/C composite surface. The existing research includes Al-based, Ag-based, Cu-based, Ti-based, Ni-based brazing filler metals, and so on. In addition, various particle reinforced composite filler materials and stress buffer metal interlayer added composite filler materials have been studied for brazing C/C composite. The summarization of the overview on the application of intermediate filler metals is made in this paper. The basic reference basis is provided for the subsequent brazing filler metals development and joint performance improvement for C/C composite brazing.

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Kubota, Yoshitaka, Toru Miyauchi und Yuki Miyahira. „1301 Sliding wear characteristics of C/C composite contact strip materials“. Proceedings of the Transportation and Logistics Conference 2013.22 (2013): 145–48. http://dx.doi.org/10.1299/jsmetld.2013.22.145.

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17

NOGUCHI, Yoshio, und Yoshio AOKI. „Measurement of Interlaminar Shear Strength of Fabric C/C Composite Materials.“ Journal of the Japan Society for Composite Materials 28, Nr. 3 (2002): 103–8. http://dx.doi.org/10.6089/jscm.28.103.

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18

Bolt, H., A. Miyahara, T. Kuroda, O. Kaneko, Y. Kubota, Y. Oka und K. Sakurai. „Experimental evaluation of c-c composite materials under high heat fluxes“. Journal of Nuclear Materials 158 (August 1988): 224–34. http://dx.doi.org/10.1016/0022-3115(88)90172-9.

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19

Krishna Sastry, K. V., und V. Seshagiri Rao. „Multi Response Optimization of Carbon-Carbon (C/C) Drilling Parameters by Using Grey Theory Technique“. Advanced Materials Research 936 (Juni 2014): 1801–8. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1801.

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The objective of this paper is to determine the optimum values of drilling parameters of carbon fibre reinforced carbon (CFRC) composite material with the help of an experimental investigation, which includes the application of unique Grey theory method. The growing application of CFRC composites, which are popularly known as ‘carbon-carbon’ composites in Aerospace, Automobile, Defence and other advanced industries has prompted research studies to develop drilling technology of these special materials. The present work demonstrates the optimization process of multiple responses.The optimum values of drilling characteristics of these composites are calculated by the application of Taguchi method in combination with Grey Relational Analysis technique. The drilling experiments were carried with a High speed steel tool on a plate of carbon-carbon composite material on a CNC Drilling vertical Machining centre.

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HAYATA, YOSHIHO. „Introductory course in "new materials related to energy utilization". (5) C/C composite materials.“ Journal of the Fuel Society of Japan 69, Nr. 2 (1990): 134–38. http://dx.doi.org/10.3775/jie.69.134.

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21

Sun, Qian, Huifeng Zhang, Chuanbing Huang und Weigang Zhang. „Fabrication of C/C–SiC–ZrB2 Ultra-High Temperature Composites through Liquid–Solid Chemical Reaction“. Crystals 11, Nr. 11 (07.11.2021): 1352. http://dx.doi.org/10.3390/cryst11111352.

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In this paper, we aimed to improve the oxidation and ablation resistance of carbon fiber-reinforced carbon (CFC) composites at temperatures above 2000 °C. C/C–SiC–ZrB2 ultra-high temperature ceramic composites were fabricated through a complicated liquid–solid reactive process combining slurry infiltration (SI) and reactive melt infiltration (RMI). A liquid Si–Zr10 eutectic alloy was introduced, at 1600 °C, into porous CFC composites containing two kinds of boride particles (B4C and ZrB2, respectively) to form a SiC–ZrB2 matrix. The effects and mechanism of the introduced B4C and ZrB2 particles on the formation reaction and microstructure of the final C/C–SiC–ZrB2 composites were investigated in detail. It was found that the composite obtained from a C/C–B4C preform displayed a porous and loose structure, and the formed SiC–ZrB2 matrix distributed heterogeneously in the composite due to the asynchronous generation of the SiC and ZrB2 ceramics. However, the C/C–SiC–ZrB2 composite, prepared from a C/C–ZrB2 preform, showed a very dense matrix between the fiber bundles, and elongated plate-like ZrB2 ceramics appeared in the matrix, which were derived from the dissolution–diffusion–precipitation mechanism of the ZrB2 clusters. The latter composite exhibited a relatively higher ZrB2 content (9.51%) and bulk density (2.82 g/cm3), along with lower open porosity (3.43%), which endowed this novel composite with good mechanical properties, including pseudo-plastic fracture behavior.

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Tan, Zhi Yong, Cong Xu, Xu Jun Zhan und Shu Yu Wang. „Characteristic Research and Test for Component Strength of C/C and C/SiC Connecting End Frame Part“. Materials Science Forum 1003 (Juli 2020): 87–91. http://dx.doi.org/10.4028/www.scientific.net/msf.1003.87.

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An analytical study on the component-level mechanical functional properties of the thermal structure connecting end frame was conducted, illustrating by advanced composite materials (ACM) C/C and C/SiC. Different grades of component-level experiments and analyses the weakness of composite connecting end frames were carried out, including the screw hole pull-out test, which mainly reflects the features of materials, the bending test of corner beams, and the corner box test with structural characteristics. The failure of different components and the factors have been obtained from this research.

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Wang, Chunguang, Weiping Tian und Min Tang. „Study on Mechanical Properties and Failure Mechanism of Axial Braided C/C Composite“. International Journal of Aerospace Engineering 2021 (03.02.2021): 1–12. http://dx.doi.org/10.1155/2021/2520598.

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In order to study the mechanical properties and failure mechanism of the axial braided C/C composites, the microscopic and macroscopic mechanical properties of the composite were investigated. In view of the size effect of the samples, the properties of the samples with different thickness were tested. The strain during loading was measured by optical method, and the failure morphology was observed by SEM. The changing characteristics of stress-strain curve were analyzed, and the failure characteristics of materials and failure mechanism under various loads were obtained. It was found that brittle fracture was observed during the tensile process of axial braided C/C composites, and the main failure forms were fiber rod pulling and partial fiber rod breaking in the axial direction. Radial failure was mainly in the form of fiber bundle fracture and crack stratification propagation. When compressed, the material exhibited pseudoplastic characteristics. The radial compression sample was cut along a 45-degree bevel. The axial compression curve was in the form of double fold, the axial fiber rod was unstable, and the transverse fiber bundle was cut. During in-plane shearing, the axial fracture was brittle and the fiber rod was cut. The radial direction showed the fracture and pulling of the fiber bundle, and the material had the characteristics of pseudoplasticity. The research methods and results in this paper could provide important references for the optimization and rational application of C/C composite materials.

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Fan, Long, Jingjing Zhang, Yongchun Zhu, Xiaobo Zhu, Jianwen Liang, Lili Wang und Yitai Qian. „Comparison between SnSb–C and Sn–C composites as anode materials for lithium-ion batteries“. RSC Adv. 4, Nr. 107 (2014): 62301–7. http://dx.doi.org/10.1039/c4ra12304b.

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25

AOYAMA, Go, Tadashi ASAMI, Masaaki MISUMI und Masafumi OHKUBO. „Interlaminar Shearing Strength Canracteristics of C/C Composite Materials under Compressive Load“. Proceedings of the JSME annual meeting 2004.1 (2004): 355–56. http://dx.doi.org/10.1299/jsmemecjo.2004.1.0_355.

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26

Guo, Jiao, Yakun Zhang, Yuan-Chun He und Jinling Shan. „Photocatalytic performance of Co3O4/C based on ZIF-67/C composite materials“. Polyhedron 175 (Januar 2020): 114215. http://dx.doi.org/10.1016/j.poly.2019.114215.

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27

Siregar, Patimah Mega Syah Bahar Nur, Alfan Wijaya, Amri Amri, Juliana Putri Nduru, Nurlisa Hidayati, Aldes Lesbani und Risfidian Mohadi. „Layered Double Hydroxide/C (C=Humic Acid;Hydrochar) As Adsorbents of Cr(VI)“. Science and Technology Indonesia 7, Nr. 1 (27.01.2022): 41–48. http://dx.doi.org/10.26554/sti.2022.7.1.41-48.

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Layered double hydroxide (LDH) is known as a layered material that can be used as an adsorbent to remove pollutants from aqueous solutions. The use of layered double hydroxide as an adsorbent is not very effective due to its structure which is easily damaged so that it cannot be reused and its small surface area which results in a small adsorption capacity. This can be overcome by developing layered double hydroxide into a composite material. Modification of layered double hydroxide is done by using supporting materials in the form of humic acid and hydrochar. In this study the adsorbent was applied in the removal of Cr(VI) metal from aqueous solutions. The layered double hydroxide modification process was successfully carried out as seen from the XRD, FTIR, and BET analysis. XRD analysis shows the peaks that appear in Mg/Al-AH and Mg/Al-HC are peaks composed of their constituent materials, namely Mg/Al LDH, humic acid, and hydrochar. The vibrations that appear in Mg/Al-AH and Mg/Al-HC are vibrations originating from Mg/Al, humic acid, and hydrochar. The layered double hydroxide material composited with humic acid showed a surface area from 2.155 m2/g to 3.337 m2/g. The layered double hydroxide material composited with hydrochar showed a larger surface area than the Mg/Al LDH base material. The surface area increased 37 times, from 2.155 m2/g to 74.207 m2/g. The Mg/Al-AH composite showed the first adsorption ability of 89.064% and there was no significant decrease in the next cycle. The Mg/Al-HC composite showed adsorption ability in the first cycle which reached 97.079%, the ability to survive up to the fifth cycle with a final ability of 75.029%.

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Yue, Yifan, Bo Wang, Kefei Yan, Renxi Zhao, Chengyu Zhang und Yulong Li. „Investigation of the Mechanical Behaviors and Damage Mechanism of C/C Composites Impacted by High-Velocity Jets“. Materials 17, Nr. 4 (19.02.2024): 963. http://dx.doi.org/10.3390/ma17040963.

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Carbon/Carbon (C/C) composites exhibit excellent mechanical properties at high temperatures, making them widely used in aerospace, such as the leading edges of spaceplane wings and the nose cones of hypersonic aircraft. However, damage caused by rain erosion to C/C composites affects their mechanical properties and poses significant challenges during operational service periods. A jet impingement test platform was employed to conduct single and multiple water-jet erosion tests on three-dimensional orthogonal C/C composite materials and to investigate the residual mechanical properties of the specimens after jet impact. The damage was characterized using optical microscopy, scanning electron microscopy, and X-ray computed tomography. The results showed that the damage types of the C/C composite materials under water-jet impingement included fiber bundle fracturing, delamination, and debonding. The extent of erosion damage was positively correlated with the jet velocity and diameter. The changes in the multi-jet damage indicated a cumulative expansion process, and z-directional fiber bundles exhibited superior resistance to jet impact damage propagation. The results of the three-point bending tests showed that the greater the initial impact damage, the lower the residual mechanical properties of the materials, and the residual strength of the specimen suddenly decreased when damage occurred at the back of the specimen.

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Muthiah, Jeno, und Lon J. Mathias. „Novel All-Hydrocarbon Thermosetting Resins as Matrix Materials for Carbon and Glass Fibre Composites Materials I: Reinforcements“. Engineering Plastics 2, Nr. 1 (Januar 1994): 147823919400200. http://dx.doi.org/10.1177/147823919400200106.

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An all-hydrocarbon resin was synthesized using commercially available materials. The resin undergoes spontaneous cure at around 200°C and cationic cure at around 100°C. This resin gives composites with excellent properties when used with glass and carbon fibres. Flexural modulus values (DuPont DMA) of ca 66 GPa were obtained for carbon fibre composites compared to 42 GPa for epoxy/carbon composites made in our laboratories using commercially available materials. The modulus value at 300°C dropped to 10% of the room temperature value for epoxy composites, whereas the new material maintained 60% of its room temperature value. When brought back to ambient temperature, the modulus value had increased to 81 GPa for the new resin samples while that of the epoxy composite dropped to 23 GPa, Glass fibre composites with the new resin performed similar to the analogous epoxy material up to 200°C but maintained their properties up to 300°C while those of the epoxy composite were drastically reduced. Boiling water treatment had a large affect on the epoxy-glass samples but no observable affect on the glass composites made with the new resin. Scanning electron micrographs showed bonding of the new resin to both carbon and glass fibre surfaces. TGA analysis of both resin and composites showed decomposition beginning at 375°C. This new thermosetting resin thus offers a low-cost approach to glass and carbon composites possessing excellent thermal and physical properties, and out standing hydrolytic stability.

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Muthiah, Jeno, und Lon J. Mathias. „Novel All-Hydrocarbon Thermosetting Resins as Matrix Materials for Carbon and Glass Fibre Composites Materials I: Reinforcements“. Polymers and Polymer Composites 2, Nr. 1 (Januar 1994): 43–48. http://dx.doi.org/10.1177/096739119400200106.

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An all-hydrocarbon resin was synthesized using commercially available materials. The resin undergoes spontaneous cure at around 200°C and cationic cure at around 100°C. This resin gives composites with excellent properties when used with glass and carbon fibres. Flexural modulus values (DuPont DMA) of ca 66 GPa were obtained for carbon fibre composites compared to 42 GPa for epoxy/carbon composites made in our laboratories using commercially available materials. The modulus value at 300°C dropped to 10% of the room temperature value for epoxy composites, whereas the new material maintained 60% of its room temperature value. When brought back to ambient temperature, the modulus value had increased to 81 GPa for the new resin samples while that of the epoxy composite dropped to 23 GPa, Glass fibre composites with the new resin performed similar to the analogous epoxy material up to 200°C but maintained their properties up to 300°C while those of the epoxy composite were drastically reduced. Boiling water treatment had a large affect on the epoxy-glass samples but no observable affect on the glass composites made with the new resin. Scanning electron micrographs showed bonding of the new resin to both carbon and glass fibre surfaces. TGA analysis of both resin and composites showed decomposition beginning at 375°C. This new thermosetting resin thus offers a low-cost approach to glass and carbon composites possessing excellent thermal and physical properties, and out standing hydrolytic stability.

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Cao, Jun, Jianbin Chen, Xinbo Wang und Jingbo Wen. „Tribology and Anti-Ablation Properties of SiC-VN-MoS2/Ta Composite Coatings on Carbon/Carbon Composites from 25 to 800 °C“. Materials 14, Nr. 22 (10.11.2021): 6772. http://dx.doi.org/10.3390/ma14226772.

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To improve the self-lubrication and anti-ablation performances of C/C (carbon/carbon) composites from 25 to 800 °C, we engineered three layers of composite coatings consisting of SiC–VN–MoS2/Ta to deposit on the surface of the C/C composites. The tribology and anti-ablation properties of the composite coatings were experimented under dry sliding wear. The equivalent stress and deformation of the composite coatings are studied. The results show that the CoFs (coefficients of friction) of the C/C composites are decreased by 156% at 800 °C due to the new generated self-lubricating compounds from the MoS2/Ta and VN coating. The anti-ablation of the C/C composites are improved by 25,300% due to the silicon glass, and the generated compounds from V, Mo and Si. The deformation of the C/C substrate under the protection of these coatings looks like a quadrangular star. The cack of the C/C composites is easily generated without the protection from coatings.

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Thakkar, Radhika, Anuj P. Maini, Sahil Mogla, Syed Shah Hussain Qadri, Praveen K. Varma und Alok Dubey. „Effect of Staining Beverages on Color Stability of Composite: A Spectrophotometric Study“. Journal of Pharmacy and Bioallied Sciences 16, Suppl 1 (Februar 2024): S389—S392. http://dx.doi.org/10.4103/jpbs.jpbs_611_23.

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ABSTRACT Objective: This study used spectrophotometry to examine how staining beverages affect the color stability of three commercial composite materials (nanohybrid composite (A), bulk fill composite (B), and flowable composite (C)) over time. Materials and Methods: Composite discs were randomly divided into groups. The specimens were kept in coffee, tea, red wine, and cola for 14 days at 37°C in the dark. At baseline, 7 days, and 14 days, spectrophotometers measured color. Calculated and analyzed color differences (E). Results: Staining beverages changed the color of all composites. Composite material A had the best color stability, whereas material C stained beverages the most. Red wine and coffee discolored composites most. Discoloration increased over the 14-day immersion period. Conclusion: Composite materials with better color stability were material A. Red wine and coffee discolored composites most. When choosing restorative materials, dentists should consider composite materials’ color stability for long-lasting, visually acceptable results.

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Li, Songyan, Xiaoxia Tian, Jiafu Wang und Shaobo Qu. „Design and Synthesis of 3D-Graphene@C/Co@N-C Composites with Broadband Microwave Absorption Performance“. Applied Sciences 12, Nr. 18 (19.09.2022): 9390. http://dx.doi.org/10.3390/app12189390.

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Improving the microwave absorption performance of Co-MOF-derived Co@N-C composite by constructing the morphology and spatial structure is a known challenge. In this work, under the action of the binder polyvinylpyrrolidone, 3D-graphene particles can be well decorated on the surface of the Co@N-C composite after high-temperature pyrolysis. In addition, due to the structural characteristics of MOFs, Co particles can be well covered by a carbon layer, which effectively solves the problem that magnetic metal particles are prone to corrosion and oxidation. The microwave absorption performances of the composite can be well adjusted by changing the average dotted density of the 3D-graphene on the Co@N-C composite. It is worth noting that the maximum reflection loss can reach −58.72 dB at the thickness of 1.64 mm, and the maximum effective absorption bandwidth can achieve 5.74 GHz at the 1.79 mm thickness, which almost covers the whole Ku band. Importantly, these results demonstrate that 3D-graphene@C/Co@N-C composites have great potential as high-efficiency microwave absorption materials.

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Feng, Wei, Xinyu Wang, Yunlong Tian, Lei Liu und Boyan Li. „Effect of Single Loading Time to the Cyclic Ablation of C/C-SiC-ZrC Composite“. Materials 15, Nr. 19 (10.10.2022): 7027. http://dx.doi.org/10.3390/ma15197027.

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To understand the influence of single loading time on the cyclic ablation of carbide modified C/C composites, a C/C-SiC-ZrC composite was impacted by plasma at 2600 K for 50 s under reciprocating 0.5 (C0.5) and 5 s (C5), respectively. The composites displayed similar negative mass and rising positive linear ablation rates from C0.5 to C5. Phases, micro-morphologies, and surface temperature analysis suggested that the partially oxidized SiC-ZrC covering on the ablated sample cracked and was persistently peeled off. The mass gain resulted from the ceramic’s protection of the nearby carbon from complete oxidation. The longer single loading of 5 s caused strengthened thermal chemical reaction and mechanical erosion, which resulted in the bigger linear loss.

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Jiang, Da Hua, An Gui Li, Fa En Shi und Ru Shan Ren. „Mineral Sepiolite Energy-Saving Residential Materials“. Advanced Materials Research 178 (Dezember 2010): 185–90. http://dx.doi.org/10.4028/www.scientific.net/amr.178.185.

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Mineral sepiolite as inorganic carrier, lauric acid(LA)-stearic acid(SA)as binary PCM(phase change material), CTAB as modifier, ethanol as solvent, mineral energy storage residential composite was prepared by intercalation, and the properties of composites were characterized using thermogravimetry(TG)/differential thermal analysis(DTA),scanning electron microscope(SEM),X-ray diffraction(XRD).Orthogo-nal experimental results show that the optimum proportion of composite materials is A3B2C1D3, the initial phase change temperature is 31.44 °C, phase transition peak temperature is 35.25°C, a wide range of endothermic peak is between 30.0~40.0°C, scope of phase change temperature is 3.81. LA-SA eutectic mixture could be retained by adding into 42.3 wt% porous sepiolite, treated at 80 °C. The weight loss of the composites is no more than 2% when melting/freezing cycling within 100°C, so it has good thermal reliability when applied to building material. Mainly due to relatively high content of mineral impurity, high temperature and CTAB can significantly help improve adsorption rate of mineral sepiolite. Sepiolite as a carrier material has features with low cost, broad sources, non-toxic and non-pollution. The composite material is a healthy residential energy-saving material, and it provides a good prospect for the realization of building energy efficiency, regulating room temperature in summer, and improving human comfort.

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Gomina, M., D. Themines, J. L. Chermant und F. Osterstock. „An energy evaluation for C/SiC composite materials“. International Journal of Fracture 34, Nr. 3 (Juli 1987): 219–28. http://dx.doi.org/10.1007/bf00019719.

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Bordun, Ihor, und Ewelina Szymczykiewicz. „Synthesis and Electrochemical Properties of Fe3O4/C Nanocomposites for Symmetric Supercapacitors“. Applied Sciences 14, Nr. 2 (12.01.2024): 677. http://dx.doi.org/10.3390/app14020677.

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In the work, nanostructured Fe3O4/C composites based on natural raw materials (beet pulp and corn stalks) are synthesised in various ways. Iron chloride FeCl3 is used as an activator. The synthesised composites are investigated using the following methods, scanning electron microscopy, X-ray diffractometry, nitrogen adsorption/desorption porometry, magnetometry, impedance and galvanostatic measurements. The presence of nanosized Fe3O4 magnetite in the synthesised carbon structures is disclosed. Based on the magnetic measurements, the particle size of Fe3O4 is on average 50 nm for the sample of the composite synthesised from beet pulp in one step, 30 nm for the sample of the composite synthesised from beet pulp in two steps, 33 nm for the composite synthesised from corn stalks in one step, and 29 nm for the composite synthesised from corn stalks in two steps. It is shown that the two-step synthesis using pre-carbonised raw materials gives the specific capacitance of the composite made with beet pulp at 96 F/g, and for the composite made with corn stalks at 95 F/g. The high coulombic efficiency (>95%) and the stability of the electrical capacitance during long-term cycling make it possible to use Fe3O4/C composites for the manufacture of supercapacitor electrodes with aqueous electrolytes.

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Shabelskaya, N. P., M. A. Egorova, G. M. Chernysheva, A. N. Saliev, A. N. Yatsenko und Y. A. Gaidukova. „Synthesis and properties of composite material CoFe2O4/C“. Proceedings of the Voronezh State University of Engineering Technologies 81, Nr. 4 (11.02.2020): 184–89. http://dx.doi.org/10.20914/2310-1202-2019-4-184-189.

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Scientific interest in the processes of forming the structure of magnetic spinels and composites based on them is due to the possibility of synthesis of materials with multifunctional properties. The process of formation of cobalt (II) nanocrystalline ferrite and CoFe2O4/C composite material is studied. The mechanism of formation of structure of materials including a stage of formation of hydroxides of transition elements, precursors on the basis of complex connections of cations of iron and cobalt with citric acid and their subsequent destruction at heating is offered. The synthesized materials were characterized by x-ray phase analysis, electron microscopy, low-temperature nitrogen adsorption, Debye-Scherrer methods. It is shown that cobalt (II) ferrite has a developed surface, the value of the surface area according to the BET method is 16 m2/g, the average size of the crystallites determined by the Debye-Scherrer equation is 4.0 nm. Activated carbon with a specific surface area of 685 m2/g was used to prepare the composite material. The resulting composite material has a surface area of 222 m2/g, the average crystallite size of 1.1 nm. Cobalt (II) ferrite, included in the composition of the composite material CoFe2O4/C, has a slightly higher value of the lattice parameter, compared with pure cobalt (II) ferrite, which is associated with a decrease in the degree of spinel inversion. The synthesized composite material was tested in the process of adsorption of copper (II) cations from an aqueous solution. It is shown that CoFe2O4/C exhibits an increased adsorption capacity for copper (II) cations in comparison with pure activated carbon, despite a decrease in the specific surface area. The result is explained by the involvement of cobalt (II) ferrite in the adsorption process. The obtained materials may be of interest as catalysts, adsorbents.

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Ping, Zhong, Ni Xin-ye, Miao Yun-liang, Lin Tao, Xiong Xin-bo und Zhou Dong. „Individual humeral head replacement by C/C composite implants coated with hydroxyapatite via rotation plasma spraying“. Science and Engineering of Composite Materials 22, Nr. 3 (01.05.2015): 325–30. http://dx.doi.org/10.1515/secm-2013-0196.

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AbstractThe humeral heads of rabbits were replaced with individualized C/C composite implants coated with hydroxyapatite (HA) via rotation plasma spraying. The effect of the implants was evaluated after 5 and 150 days by using histology, scanning electron microscopy, X-ray diffraction, and so on. Results showed that the coating interface of C/C composites facilitated phosphorite deposition and osseous tissue growth. Furthermore, the humeral bone and remaining bone tissues were morphologically similar and possessed enhanced bonding strength. These results indicated that individualized C/C composite implants with HA coatings enabled the humeral head to adapt to dynamic requirements and accelerate healing after bone transplantation.

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Shao, H. C., X. C. Liu, J. Yang, Shahid Hussain, Muhammad Sufyan Javed, G. W. Liu, G. J. Qiao et al. „Harden Insulation Performances of Low Density C/C Composites Imitative from Different Carbon Matrix Precursors“. Science of Advanced Materials 15, Nr. 1 (01.01.2023): 17–25. http://dx.doi.org/10.1166/sam.2023.4396.

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Stuffing the needled carbon felts preform via chemical vapor infiltration (CVI) (propylene as precursor) or resin impregnation/carbonization (phenolic resin as precursor) or combining the two processes results in three types of low-density carbon/carbon composites (LDC/C) with various carbon matrixes. The performance factors involving density, porosity, thermal conductivity (TC), impurity, compressive strength, composition of three LDC/C composites are investigated systematically. The microstructures of LDC/C composites are analyzed to clarify the relationship between the performances and preparation process. The density, TC, and compressive strength of resin solution rise with growing CVI time and resin solution concentration, correspondingly. Dual carbon matrix LDC/C composites have greater TC and compressive strength than two single carbon matrix LDC/C composites. The resin carbon matrix LDC/C composite has greatest ash content of the three, which may be attributable to the considerable quantity of indecomposable impurity originating from the phenolic resin.

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Zhang, Wei Li, Jian Zhu, Ping Wang, Ke Lin Li, Ming Jing Lei und Yang Su. „Research Advancement of C/C Woodceramics“. Advanced Materials Research 598 (November 2012): 497–503. http://dx.doi.org/10.4028/www.scientific.net/amr.598.497.

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C/C woodceramics is one of the polymeric organic/inorganic composite materials, and it has many advantages such as rich raw material source, little harm to environment in its production and use, good renewable property and wide application. In recent year, it is highly important and significant for C/C woodceramics study. The changes of C/C woodceramics’ structure and property influenced by different wood types, sintering temperature, and resin content are summarized comprehensively in this paper. Preparation mechanism and properties of woodceramics are also concluded. In the final, problems found in the field of C/C woodceramics research have been put forward and discussed.

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Scian, A. N., und C. Volzone. „Nuevo material compuesto adsorbente SiO₂C“. Boletín de la Sociedad Española de Cerámica y Vidrio 40, Nr. 4 (30.08.2001): 279–84. http://dx.doi.org/10.3989/cyv.2001.v40.i4.737.

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Wijaya, Alfan, Tarmizi Taher, Aldes Lesbani und Risfidian Mohadi. „Variation of M2+ (Ni and Zn) in Cellulose-based M2+/Cr Composite Materials to Determine Adsorption and Regeneration Abilities on Phenol Removal“. Science and Technology Indonesia 7, Nr. 4 (31.10.2022): 461–68. http://dx.doi.org/10.26554/sti.2022.7.4.461-468.

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Cellulose-based Ni/Cr (Ni/Cr-C) and cellulose-based Zn/Cr (Zn/Cr-C) composite materials have been successfully carried out, which is indicated by the XRD, FTIR, and BET analysis. Layered double hydroxide Ni/Cr (Ni/Cr-LDH) increased surface area from 0.128 m2/g to 2.207 m2/g in Ni/Cr-C composites, and layered double hydroxide Zn/Cr (Zn/Cr-LDH) also increased surface area from 0.133 m2/g to 3.714 m2/g in Zn/Cr-C composites. The pHpzc of the material in this study is pH 5.94-8.43, while the optimum pH of all materials is pH 9. Ni/Cr-LDH experienced an increase in adsorption capacity after becoming a Ni/Cr-C composite, from 8.985 mg/g to 24.510 mg/g, and Zn/Cr-LDH experienced an increase in adsorption capacity from 13.263 mg/g to 30.960 mg/g in Zn/Cr-C. Zn/Cr-C composite material has a greater adsorption ability than Ni/Cr-C. Kinetic and isotherm model in this study followed by PSO kinetic with optimum contact time at 70 minutes and Freundlich isotherm. Ni/Cr-C and Zn/Cr-C composite materials can be used repeatedly in the regeneration process until the 4th cycle.

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Zha, B. L., Q. D. Su, Y. A. Shi, J. J. Wang und Q. He. „Study on plasma ablation behavior of C/C composite materials under particle erosion“. IOP Conference Series: Materials Science and Engineering 423 (07.11.2018): 012094. http://dx.doi.org/10.1088/1757-899x/423/1/012094.

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Zhang, L. X., B. Zhang, Z. Sun, X. Y. Pan, J. M. Shi und J. C. Feng. „Preparation of graded double-layer materials for brazing C/C composite and TC4“. Journal of Alloys and Compounds 823 (Mai 2020): 153639. http://dx.doi.org/10.1016/j.jallcom.2020.153639.

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Yan-Rong, GUO, CHANG Wei, ZHANG Wen und WANG Hui. „Photocatalytic Properties of MOF-derived ZnO/C, Ag/ZnO/C Porous Composite Materials“. Journal of Inorganic Materials 30, Nr. 12 (2015): 1321. http://dx.doi.org/10.15541/jim20150201.

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Kanai, Aya, Masanao Sekine, Koji Fujimoto und Tadashi Shioya. „The strength of C/C Composite Materials fabricated by pre-formed yarn method“. Proceedings of the Materials and processing conference 2004.12 (2004): 355–56. http://dx.doi.org/10.1299/jsmemp.2004.12.355.

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Zhu, Shijie, Takashi Gomyou, Yasuo Ochi, Toshio Ogasawara und Takashi Ishikawa. „Effects of loading rate and temperature on tensile behavior of orthogonal three-dimensional woven Si–Ti–C–O fiber/Si–Ti–C–O matrix composites“. Journal of Materials Research 19, Nr. 10 (01.10.2004): 2964–73. http://dx.doi.org/10.1557/jmr.2004.0375.

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Effects of loading rate and temperature on tensile behavior have been studied in air using two kinds of orthogonal three-dimensional woven Si–Ti–C–O fiber-reinforced Si–Ti–C–O matrix composites, processed by polymer infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI). Since the interphase and porosity of the two composites are controlled in as similar a manner as possible, the effect of matrix processing method is understood. The strength of the PIP composite is greater than that of the CVI composite at room temperature, but they are almost the same at high temperatures. It was found that the PIP composite is more sensitive to loading rate than the CVI composite due to more glassy phases in the PIP composite.

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Lawson, NC, R. Radhakrishnan, DA Givan, LC Ramp und JO Burgess. „Two-year Randomized, Controlled Clinical Trial of a Flowable and Conventional Composite in Class I Restorations“. Operative Dentistry 40, Nr. 6 (01.11.2015): 594–602. http://dx.doi.org/10.2341/15-038-c.

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SUMMARY Objectives This study evaluated the two-year clinical performance and volumetric wear of a flowable resin composite compared to a conventional highly filled composite resin in Class I restorations. Methods and Materials In this single-center, single-blinded, comparator-controlled clinical study (Institutional Review Board approved), 120 carious teeth distributed in 60 patients were randomly assigned to four calibrated practitioners who placed occlusal restorations (n=60 flowable and n=60 conventional composite). Direct and indirect assessment at baseline, six months, one year, and two years occurred during which the modified Cvar and Ryge criteria were evaluated. Volumetric wear was determined by superimposition of profilometer scans of baseline and two-year casts. Results At two years, there was no significant difference in anatomic form (p=0.80), color match (p=0.08), marginal adaptation (p=0.89), marginal discoloration (p=0.79), surface integrity (p=0.18), secondary caries (p=0.66), cold sensitivity (p=0.522), occlusal sensitivity (p=0.818), or volumetric wear (p=0.661) between materials. Both materials showed a decrease in all criteria except secondary caries (p=0.95) over time. Two-year mean volumetric wear was 3.16 ± 2.38 mm3 for the flowable composite and 3.43 ± 2.50 mm3 for the conventional composite. Conclusions The flowable and conventional composites used in this study have similar clinical efficacy after two years of service when placed as Class I occlusal restorations having isthmus widths less than one-half the intercuspal distance.

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Rajaram, Srinivasan, Thirugnanam Subbiah, Parammasivam Kanjikovil Mahali und Muthuramalingam Thangaraj. „Effect of Age-Hardening Temperature on Mechanical and Wear Behavior of Furnace-Cooled Al7075-Tungsten Carbide Composite“. Materials 15, Nr. 15 (03.08.2022): 5344. http://dx.doi.org/10.3390/ma15155344.

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In this study, aluminum alloy (Al7075) composites with a 4% weight fraction of tungsten carbide (WC) were manufactured using a stir casting process and the developed composites were subjected to various ageing temperatures. An attempt has been made to predict the age-hardening temperature with the enhanced mechanical and wear properties of Al7075-WC. The result shows that the composite specimen aged at 250 °C offered maximum tensile strength and the Brinell hardness number was increased by 37.1% and 50.5%, respectively; the maximum impact energy was observed to be 92.2% for the 450 °C aged composites, compared to the non-aged Al7075-WC composites. The strength properties of the Al7075-WC composite decreased to 30.86%, 4.7%, and 24.9% when the composite specimens aged at 350 °C. The mechanical properties of the Al7075-WC composite were increased at the age-hardening temperatures from 150 °C to 250 °C and decreased from 250 °C to 350 °C. The wear testing pin-on-disc setup utilized to determine the wear characteristics of the prepared MMC with wear parameters of load and sliding distance and the wear resistance of the composite specimens increased due to ageing. The fractography analysis of the composite samples carried out by scanning electron microscope (SEM) images revealed that the fracture of the composite during the tensile test is a mixture of ductile and brittle modes.

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