Artículos de revistas: "Carbure de nickel"

1

Meyer, G. y F. E. C. Scheffer. "Sur un Carbure de Nickel". Recueil des Travaux Chimiques des Pays-Bas 46, n.º 1 (3 de septiembre de 2010): 1–7. http://dx.doi.org/10.1002/recl.19270460102.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

2

Abdullahi, Umma. "Effects of Alloying Element and Heat Treatment on Mechanical Properties of Alloy Steels". International Journal of Engineering Materials and Manufacture 8, n.º 3 (1 de julio de 2023): 67–74. http://dx.doi.org/10.26776/ijemm.08.03.2023.02.

Texto completo

Resumen

The effects of Cr and Ni on three different types of steel with different carbon ratios under constant conditions such as the welding current 120A, voltage 80V, Diameter 10 mm and angle 60 degree was observed. Nickel percentage of up to 0.147% and Chromium 0.083% contributed to affecting the mechanical properties of the steel. Undissolved carbide particles refine the austenite grain size. In the presence of nickel, chromium carbide is less effective in austenite grain refinement than chromium carbide in absence of nickel at temperature below 975°C. Nickel does not produce any austenite grain refinement but presence of nickel promotes the formation of acicular ferrites. It was also found that Ni and Cr as chromium carbide also refines the ferrite grain size and morphology. Cr as chromium carbide is more effective in refining ferrite grain size than nickel. The microstructure of the base metal as a reference material was analysed before heating to support the results of chemical analysis. Nickel percentage of up to 0.147% and Chromium 0.083%. Molybdenum was 0.03% which contributed to affecting the mechanical properties of the steel.Keyword: Alloy steel, Heat treatment, Chromium, Nickel, Grain size

Los estilos APA, Harvard, Vancouver, ISO, etc.

3

Zhang, Hui, Yan Liu, Yong Jie Yan, Han Qin Liang, Xue Jian Liu y Zheng Ren Huang. "Wetting Behaviors of Nickel-Based Alloys on Sintered Silicon Carbide Ceramics". Key Engineering Materials 602-603 (marzo de 2014): 274–78. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.274.

Texto completo

Resumen

Wetting behaviors of pure nickel and nickel-based alloys on sintered silicon carbide ceramics and their interfacial microstructures were investigated in this presentation. The nickel-based alloys were mainly the commercial nickel-molybdenum-chromium products. The wetting and spreading properties were observed by a real-time thermal optical measurement system under flowing argon-5%hydrogen atmosphere. As temperature increased, the pure nickel cylinder sample had few changes before 1356°C except for the thermal expansion in size and changed to liquid drop-shape when the temperature reached 1366°C. The contact angle was about 90o. And nickel could not contact sintered silicon carbide ceramics well. However, the introduction of molybdenum and/or chromium in the pure nickel was good for the wetting properties of pure nickel on sintered silicon carbide ceramics. The contact angles of nickel-based alloys (B-1, C-1 and C-2) on sintered silicon carbide ceramics after holding 15min at 1400°C were 25o, 12.5o, 11.5o, respectively. And they hardly reduced as temperature increased. The SEM images indicated that the interfacial microstructures of B-1 and C-1 on sintered silicon carbide ceramic substrates were uniform and the dissolved interface near silicon carbide ceramics indicated that they had a good bonding. At the same time, the reciprocal diffusion was clear in the intermediate layer. Besides that, the introduction of chromium was supposed to reduce the diffusion rate of molybdenum from the alloy to the ceramic substrate.

Los estilos APA, Harvard, Vancouver, ISO, etc.

4

Dmytriieva, G. P., T. S. Cherepova, T. V. Pryadko, T. A. Kosorukova y A. V. Nosenko. "Structural Investigations of Doped Eutectic Alloys Based on Nickel with Niobium Carbide". METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 44, n.º 7 (10 de octubre de 2022): 873–85. http://dx.doi.org/10.15407/mfint.44.07.0873.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

5

Wang, Xiao Hong, Qiao Gang Hu, Shi Yu Zhong, Teng Dang, Hai Lun Wang y Yuan Hua Lin. "Effect of Nickel-Modified SiC Particles on Compressive Damage of SiCp / 7075 Composites". Materials Science Forum 944 (enero de 2019): 705–13. http://dx.doi.org/10.4028/www.scientific.net/msf.944.705.

Texto completo

Resumen

The wettability between silicon carbide and aluminum is poor, silicon carbide is difficult to fuse or the distribution of silicon carbide is not uniform in the ingot when the SiCp / 7075 composite is prepared by melt casting.The surface modification of SiCp by nickel plating can significantly reduce the wetting angle of SiC/Al and improve the distribution uniformity of silicon carbide in SiCp / 7075. In this thesis, the thermal compression process 6.5% SiCp / 7075 reinforced by nickel-plated modified silicon carbide is simulated by DEFOEM-3D software.The influence of the shape and particle size of nickel-plated modified silicon carbide on its compressive damage has been highlighted, and the deformation characteristics of the SiC/Ni/Al interface layer in the thermal compression process have been discussed. The numerical simulation results show that the 6.5% SiCp / 7075 reinforced by spherical nickel-plated modified silicon carbide particles with a particle size of 15 μm has the smallest compression damage value of 0.0426, at this point the compression temperature is 400°C, the compression ratio is 15, and the compression rate is 0.03s-1. the hot compression test of 6.5% SiCp / 7075 reinforced by spherical nickel-plated modified silicon carbide particles with a particle size of 15 μm was performed by using the same compression parameters as the numerical simulation. After hot pressing, the sample had a smooth surface with few obvious cracks, which was consistent with the numerical simulation results. Key words: nickel-plating modification; silicon carbide particles; compressive damage; grain size; grain morphology

Los estilos APA, Harvard, Vancouver, ISO, etc.

6

Zhang, Yun, Feida Chen, Xiaobin Tang, Hai Huang, Minxuan Ni y Tuo Chen. "Preparation and characterization of paraffin/nickel foam composites as neutron-shielding materials". Journal of Composite Materials 52, n.º 7 (5 de julio de 2017): 953–62. http://dx.doi.org/10.1177/0021998317717596.

Texto completo

Resumen

Traditional neutron-shielding materials usually have poor mechanical properties and secondary gamma-shielding capability. The new requirements of modern neutron-shielding materials are difficult to satisfy. A paraffin/nickel foam neutron-shielding composite was prepared and characterized in this study. Open-cell nickel foams were fabricated through electrodeposition. Subsequently, the paraffin/nickel foam composite were prepared by filling the open-cell nickel foams with melted paraffin. The intrinsic parameters of nickel foam and the content of neutron absorber (boron carbide) were controlled to optimize the composite. The mechanical properties of the composite were studied through a static compression test. The compressive strength improved to 0.4 times that of the nickel foams. The Am–Be source transmittance experiment showed that the 8 cm thick PFM presented a neutron transmittance of 56.1%, and the 6 cm thick boron carbide/paraffin/nickel foam (PFM-B) presented a neutron transmittance of 37.6%. The paraffin/nickel foam and PFM-B had approximately the same shielding efficiency as paraffin and boron carbide/paraffin, respectively. However, the second gamma ray shielding efficiency of the paraffin/nickel foam and PFM-B was significantly higher than that of paraffin and boron carbide/paraffin. The mechanical properties and secondary gamma ray-shielding capability of the composite can be improved by increasing the relative density of nickel foams.

Los estilos APA, Harvard, Vancouver, ISO, etc.

7

Arzumanova, A. V. y A. V. Starunov. "Effect of Electrolysis Modes on Physico-Mechanical Properties of Composite Coatings Based on Nickel". Materials Science Forum 945 (febrero de 2019): 647–52. http://dx.doi.org/10.4028/www.scientific.net/msf.945.647.

Texto completo

Resumen

The receiving method and some properties of the composite nickel containing galvanic coating on base nickel-cobalt-oxide silicon-carbide silicon system were discussed. Chloride electrolyte for the application of the composite electroplating coating with firmness to wear and corrosion properties of nickel-cobalt-oxide silicon-carbide silicon system was elaborated. Influence of electrolysis and electrolyte composition on physico-mechanical properties (firmness to wear, corrosion resistance, hardness, internal tensions, porosity, adhesion) of the composite electrolytic coating of nickel-cobalt-silicon oxide system, electroplated from chloride electrolyte, and on the properties of electrolyte (diffusing ability, output current draught) were investigated. The possibility of using for composite electroplating of nickel-cobalt-silicon oxide-carbide silicon system as a firmness to wear coating in instead of chrome was showed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

8

Dantas, S. L. A., Y. F. Gomes, A. L. Lopes-Moriyama, M. A. Correa y C. P. Souza. "Molybdenum carbide doped with nanostructured nickel for application in degradation of reactive dyes". Cerâmica 66, n.º 380 (diciembre de 2020): 460–66. http://dx.doi.org/10.1590/0366-69132020663802963.

Texto completo

Resumen

Abstract Carbide-type ceramic materials such as nickel-doped molybdenum carbide have promising photocatalytic degradation activity. The addition of nickel to the molybdenum carbide aims to increase its reaction yield and also its characteristics. The objective of this paper was to study the photocatalytic activity of Mo2C and 5% and 10% nickel-doped Mo2C materials used for the degradation of the Maxilon Blue GRL 300 textile dye. The structural properties were characterized by X-ray diffraction and scanning electron microscopy. For the determination of band gap energy, diffuse reflectance spectroscopy was used. The samples of the photocatalysis tests were analyzed by UV-visible spectroscopy. The best reaction yield was observed for the 5% nickel-doped molybdenum carbide sample in photocatalytic tests, reaching a yield of around 92% in the final concentration of the dye solution.

Los estilos APA, Harvard, Vancouver, ISO, etc.

9

Ahmed, Mohiuddin, Md Mohar Ali Bepari y Roisul Hasan Galib. "Effects of Chromium and Nickel Additions on the Austenite Grain Coarsening of Low Carbon Structural Steels Containing 0.13% C". Applied Mechanics and Materials 860 (diciembre de 2016): 152–57. http://dx.doi.org/10.4028/www.scientific.net/amm.860.152.

Texto completo

Resumen

The austenite grain coarsening behavior of low carbon (0.13% C) structural steels containing chromium and nickel singly or in combination were studied by heating the steels at successive high temperature in the austenite zone in the temperature range of 900-1100°C with an interval of 50°C. The carburizing technique has been adopted to reveal the prior austenite grain boundaries and mean linear intercept method was used to measure the austenite grain size.It was found that on heating the undissolved particles of chromium carbide, Cr2C refine the austenite grain size at temperature below 1000°C, but the effect decreases with increasing temperature. Nickel does not produce any austenite grain refinement. In the presence of nickel particles of chromium carbide are less effective than chromium carbide particles in the absence of nickel in the refinement of austenite grain size.

Los estilos APA, Harvard, Vancouver, ISO, etc.

10

Weihnacht, Volker, W. D. Fan, K. Jagannadham, J. Narayan y C.-T. Liu. "A new design of tungsten carbide tools with diamond coatings". Journal of Materials Research 11, n.º 9 (septiembre de 1996): 2220–30. http://dx.doi.org/10.1557/jmr.1996.0282.

Texto completo

Resumen

We have designed tungsten carbide tools with a new binder, which makes them suitable for advanced diamond tool coatings. The new tool substrates, made of tungsten carbide and nickel aluminide as binder phase, are produced by sintering and hot isostatic pressing, and also by combustion synthesis. The high temperature strength of nickel aluminide is key to superior tool performance at elevated temperatures. More importantly, nickel aluminides reduce the formation of graphite and promote diamond growth during chemical vapor deposition. Diamond films are deposited on the new tool substrates to investigate the nucleation density, adhesion, and wear resistance. The diamond coatings are characterized by scanning electron microscopy and Raman spectroscopy. The graphitizing tendency due to cobalt in the tungsten carbide tools was found to be a limitation to improve adhesion of diamond films. The new tool substrates with nickel aluminide binder have been found to exhibit good adhesion and wear resistance. The implications of these results in advanced cutting tools are discussed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

11

Jumate, Nicolaie, Ioan Vida-Simiti, Dorel Nemeş, György Thalmaier, Niculina Sechel y Valentin Moldovan. "FeNi-TiC Composite Powders Obtained by Electrolytic Co-Deposition". Materials Science Forum 672 (enero de 2011): 133–36. http://dx.doi.org/10.4028/www.scientific.net/msf.672.133.

Texto completo

Resumen

The paper presents a preliminary study on the obtaining of a composite powder by an electrolytic method. The composite powder particles are composed of iron nickel alloy that represents the matrix of the composite, and titanium carbide as the reinforcement. The matrix was obtained by electrolytic co-deposition from pure iron and nickel, in form of consumable electrodes. The titanium carbide powder is in suspension in the electrolyte. By the migration of metallic ions towards the cathode, the iron- nickel alloy is formed and, by simultaneously driving the carbide particles found in the electrolyte onto the cathode, the composite powder is obtained. The resulted composite powders were characterized by optical and electron microscopy. The influence of obtaining conditions over the morphology and structure of composite powders is emphased.

Los estilos APA, Harvard, Vancouver, ISO, etc.

12

Miranda, G., B. Guimarães, D. Pereira, M. Buciumeanu, A. Cabral, M. Fredel, FS Silva y B. Henriques. "Mechanical and tribological performance of Ni–Co-based binders for cubic boron nitride cutting tools". Journal of Composite Materials 54, n.º 20 (29 de enero de 2020): 2753–60. http://dx.doi.org/10.1177/0021998320902514.

Texto completo

Resumen

Cubic boron nitride is becoming an alternative cutting tool material for machining under demanding conditions, displaying superior wear performance and machined parts with higher quality. The current need to reduce the cobalt content in these tools led to this study and focused on alternative binder materials for cubic boron nitride cutting tools. This work addresses several nickel–cobalt-based materials, regarding their microstructure, mechanical (hardness and shear strength), and tribological performance. The best results were attained when adding tungsten carbide to nickel–cobalt, once nickel–cobalt–tungsten carbide was found to display the higher mechanical properties, together with the higher wear resistance.

Los estilos APA, Harvard, Vancouver, ISO, etc.

13

Li, Hui, Feng Gao, Yan Li y Lijing Bai. "Experimental Study on the Dry Drilling Nickel-Based Superalloy of CrAlYN Coated Carbide Bit". Materials 15, n.º 12 (17 de junio de 2022): 4302. http://dx.doi.org/10.3390/ma15124302.

Texto completo

Resumen

Nickel-based superalloy is regarded as one of the materials with the poorest cutting and drilling performance. Additionally, there is much less research on the drilling of it. This paper aims to study the drilling performance of dry drilling nickel-based superalloy with uncoated and CrAlYN coated carbide bit. First of all, the primary and secondary factors influencing the machining performance of dry drilling nickel-base superalloy uncoated carbide bit were explored through an orthogonal test. Secondly, the self-prepared CrAlYN coated carbide drills, and uncoated drills were compared and analyzed from perspectives of service life, drilling force, drilling temperature, drill surface topography, failure mechanism, and machining surface quality. The research results are as follows: the drilling temperature is the primary factor affecting the drilling performance under dry drilling conditions. CrAlYN coating can obviously prolong the service life of tools, reduce the drilling force and drilling temperature, and improve the machining surface quality at lower rotational speeds. Moreover, the coated cemented carbide bit has a similar failure mode to the uncoated cemented carbide bit after the CrAlYN coating falls off in the wear zone of cemented carbide bit, which is mainly bonding wear on the rear tool surface and the front tool surface.

Los estilos APA, Harvard, Vancouver, ISO, etc.

14

Guo, Bian, Mengnan Liu, Yan Li, Jianming Zheng, Xubo Li, Chao Peng, Zhangshuai Jing, Feizhou Li y Qiangliang Yu. "The Tribological Properties of Low-Sulfur and Low-Phosphorus Halogen-Free Ionic Liquids as Lubricants for the Nickel-Based Alloy Inconel 690". Coatings 13, n.º 10 (19 de octubre de 2023): 1793. http://dx.doi.org/10.3390/coatings13101793.

Texto completo

Resumen

In this study, we synthesized three low-sulfur and low-phosphorus ionic liquids (ILs). These were N88816P8, P88816P8, and P88816DOSS. The viscosity and thermal stability of the three ILs were analyzed. The tribological properties and lubrication mechanisms of the three ILs were investigated as lubricants for a carbide ball–Inconel 690 nickel-based alloy friction pair and compared at 50 °C and 150 °C. The wear spots of the carbide ball and nickel-based alloy disc samples were characterized using SEM and EDS. The experimental results revealed that P88816P8 had excellent tribological properties. The lubrication mechanism of P88816P8 as a lubricant for the carbide ball–Inconel 690 nickel-based alloy friction pair was investigated using XPS. The excellent friction reduction and anti-wear properties of P88816P8 could be attributed to the tribo-chemistry between P88816P8 and Inconel 690 as well as the formation of a tribo-film on the wear-spot surface. This high-performance IL, suitable for carbide ball–Inconel 690 contact, will be applied to a cutting process of Inconel 690.

Los estilos APA, Harvard, Vancouver, ISO, etc.

15

Gabor, Barbara, Carl Krüger, Bernd Marczinke, Richard Mynott y Günther Wilke. "Nickel(0)-Carbene Complexes". Angewandte Chemie International Edition in English 30, n.º 12 (diciembre de 1991): 1666–68. http://dx.doi.org/10.1002/anie.199116661.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

16

Kumar, G. S. Pradeep, Sampreeth Sunkad, R. Jogeshwar, R. Keshavamurthy, Vijay Tambrallimath, Sasidhar Jangam y Dadapeer Basheer. "Experimental Investigations on Erosion-Corrosion Characteristics of HVOF-Sprayed WC-10% Ni Coatings Deposited on Aluminum Alloy". Advances in Materials Science and Engineering 2023 (13 de febrero de 2023): 1–16. http://dx.doi.org/10.1155/2023/8533871.

Texto completo

Resumen

The current work investigates the erosion-corrosion behaviour of thermally sprayed tungsten carbide-10% nickel (WC-10% Ni) coatings placed on the AA6061 aluminum alloy. The AA6061 aluminum alloy was coated with tungsten carbide –10% nickel coatings utilising a high-velocityoxy-fuel (HVOF) spray method. The microstructure and hardness of thermally sprayed coatings were examined using a scanning electron microscope (SEM) and a Vickers hardness tester. The slurry erosion-corrosion wear tests were carried out by varying the parameters of the slurry erosion process, such as testing time, slurry content, slurry speed, and impinging particle size, on the erosion testing equipment. The data demonstrated that when slurry concentration, slurry speed, and impinging particle size increased, so did the slurry erosion-corrosion wear loss. The wear processes of uncoated and thermally sprayed tungsten carbide –10% nickel have been examined using SEM and a 3-D confocal microscope.

Los estilos APA, Harvard, Vancouver, ISO, etc.

17

Yamamoto, Carlos D., Zijie Zhang y Sabine Chantal E. Stieber. "Crystal structure of (η4-cyclooctadiene)(3,3′-dimesityl-1,1′-methylenediimidazoline-2,2′-diylidene)nickel(0) tetrahydrofuran monosolvate". Acta Crystallographica Section E Crystallographic Communications 74, n.º 10 (7 de septiembre de 2018): 1396–99. http://dx.doi.org/10.1107/s2056989018012252.

Texto completo

Resumen

The crystal structure of the title compound, [Ni(C25H28N4)(C8H12)]·C4H8O or (MesNHC2Me)Ni(COD), which contains a bidentate N-heterocyclic carbene (NHC) ligand with mesityl aryl groups is reported. The complex at 100 K has monoclinic (P21/c) symmetry and a distorted tetrahedral geometry around the nickel center, with the cyclooctadiene ligand coordinated in a κ2,η2 fashion. The bidentate NHC ligand is not planar, with a C(carbene)—Ni—C(carbene) angle of 91.51 (12)°, resulting in the mesityl groups being on the same side of the cyclooctadiene (COD) ligand. One molecule of tetrahydrofuran (THF) is co-crystallized with the nickel complex and has positional disorder.

Los estilos APA, Harvard, Vancouver, ISO, etc.

18

Borowicz, Paweł, Adrian Kuchuk, Zbigniew Adamus, Michał Borysiewicz, Marek Ekielski, Eliana Kamińska, Anna Piotrowska y Mariusz Latek. "Structure of Carbonic Layer in Ohmic Contacts: Comparison of Silicon Carbide/Carbon and Carbon/Silicide Interfaces". ISRN Physical Chemistry 2013 (14 de febrero de 2013): 1–11. http://dx.doi.org/10.1155/2013/487485.

Texto completo

Resumen

The structure of carbonic layer in three samples composed of 4H polytype of silicon carbide and the following sequence of layers: carbon/nickel/silicon/nickel/silicon was investigated with Raman spectroscopy. Different thermal treatment of the samples led to differences in the structure of carbonic layer. Raman measurements were performed with visible excitation focused on two interfaces: silicon carbide/carbon and carbon/silicide. The results showed differences in the structure across carbon film although its thickness corresponds to 8/10 graphene layers.

Los estilos APA, Harvard, Vancouver, ISO, etc.

19

Carrino, Luigi, Massimo Durante, Antonio Formisano, Antonio Langella, Fabrizio Memola Capece Minutolo y Antonio Caraviello. "Wear Behavior of WC-Co Carbides with Addition of Cr₃C₂ and Ni". Key Engineering Materials 611-612 (mayo de 2014): 444–51. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.444.

Texto completo

Resumen

Cemented carbides present some characteristics that ensure high performances for cutting and wear-resistant tools. The aim of the work is to evaluate the influence of Chromium Carbide and Nickel on the properties (wear and friction) of a cemented carbide constituted by a hard phase of tungsten carbide and a binder phase of cobalt. Different tests were carried out by varying the percentage of Cr3C2 and, for one only case, also Nickel was added. The tests were carried out by a pin-on-disk apparatus and diamond abrasive sheet. The experimental campaign provided tests for different values of load and relative velocity. Friction coefficient was directly evaluated by the apparatus and data on the wear were obtained by measuring the loss of weight of the samples (parallelepipeds with hemispherical head). The tests allowed to determine the percentage of Cr3C2 that ensure an improvement of the aforementioned properties and to highlight the irrelevance of Nickel.

Los estilos APA, Harvard, Vancouver, ISO, etc.

20

Chen Siyu, 陈思宇, 夏椰林 Xia Yelin, 刘兴宇 Liu Xingyu, 雷剑波 Lei Jianbo y 王涛 Wang Tao. "圆环摆动激光沉积碳化钨增强镍铜合金微观组织及耐磨性研究". Chinese Journal of Lasers 50, n.º 20 (2023): 2002103. http://dx.doi.org/10.3788/cjl230686.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

21

Sheng, Meili, Nan Jiang, Samantha Gustafson, Bo You, Daniel H. Ess y Yujie Sun. "A nickel complex with a biscarbene pincer-type ligand shows high electrocatalytic reduction of CO2over H2O". Dalton Transactions 44, n.º 37 (2015): 16247–50. http://dx.doi.org/10.1039/c5dt02916c.

Texto completo

Resumen

We report a planar nickel complex coordinated with a pincer-type carbene–pyridine–carbene ligand which exhibits high selectivity for electrocatalytic CO₂reduction in the presence of H₂O.

Los estilos APA, Harvard, Vancouver, ISO, etc.

22

Wahab, Hassan A., M. Y. Noordin, Mohammad Sakhawat Hussain y S. Izman. "Characteristics of Electroplated Nickel Layer on Tungsten Carbide". Applied Mechanics and Materials 315 (abril de 2013): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amm.315.73.

Texto completo

Resumen

Diamond coating on tungsten carbide (WC-Co) cutting tools with cobalt binder experiences delaminating failure due to the deleterious effect of cobalt. One of the methods used to reduce this effect is by coating an interlayer onto the substrate surface prior to diamond deposition. Different materials have been used as an interlayer which is normally deposited to the substrate surface using CVD and PVD techniques. Among different materials used as interlayer on WC-Co, nickel is considered as an attractive candidate due its good chemical and physical properties. In this study the potential of the electroplating technique for deposition of nickel interlayer on WC-Co will be investigated. Nickel deposition on WC-6%Co substrate was carried out by electroplating in a standard watts solution at constant plating parameters (Current: 0.1 Amp, electric potential: 1.0 V and pH: 3.5). The gap between anode and cathode was varied (5mm, 10mm and 15mm). The nickel coating formed on the hard metal surface was characterized in terms of the coating thickness, layer uniformity and coating hardness by using SEM and the micro hardness tester. Based on the results, desirable nickel coating properties were obtained when the separation distance between anode and cathode was 15mm.

Los estilos APA, Harvard, Vancouver, ISO, etc.

23

Firlus, Konstantin, Rainer Völkl, Johannes Gabel y Uwe Glatzel. "The influence of Cr, Al, Co, Fe and C on negative creep of Waspaloy". International Journal of Materials Research 112, n.º 2 (1 de febrero de 2021): 90–97. http://dx.doi.org/10.1515/ijmr-2020-7980.

Texto completo

Resumen

Abstract Negative creep using precision dilatation experiments is investigated on a broad variety of single, dual and multiphase nickel-based superalloys. Pure nickel and dilute binary nickel-based alloys show no signs of negative creep. However, with higher contents of Cr and Al and in highly alloyed ternary and multicomponent nickel-based alloys negative creep is observed. Short range ordering of Cr and/ or Al are identified to cause negative creep at 550 °C. Carbon additions leading to retarded carbide precipitation or transformation can enhance negative creep.

Los estilos APA, Harvard, Vancouver, ISO, etc.

24

Mishra (Pathak), S. K., S. K. Das, A. K. Ray y P. Ramchandrarao. "Effect of nickel on sintering of self-propagating high-temperature synthesis produced titanium carbide". Journal of Materials Research 14, n.º 9 (septiembre de 1999): 3594–98. http://dx.doi.org/10.1557/jmr.1999.0485.

Texto completo

Resumen

A detailed study of the sintering behavior of titanium carbide (TiC) powder synthesized by the self-propagating high-temperature synthesis (SHS) route was carried out with varying percentages of nickel. With an increase in the nickel content, porosity was found to increase along with Ni2.67Ti1.33 secondary phase at grain boundary. A 90–92% dense sintered body of TiC was produced from SHS-produced powder at 1800 °C with 10 wt% nickel.

Los estilos APA, Harvard, Vancouver, ISO, etc.

25

Fahami, Abbas, Bahman Nasiri-Tabrizi, Mohsen Rostami y Reza Ebrahimi-Kahrizsangi. "Influence of Surfactants on the Characteristics of Nickel Matrix Nanocomposite Coatings". ISRN Electrochemistry 2013 (3 de febrero de 2013): 1–8. http://dx.doi.org/10.1155/2013/486050.

Texto completo

Resumen

Nickel-based nanocomposite coatings were prepared from a Watts-type electrolyte containing reinforcement’s particles (silicon carbide and graphite) to deposit onto the steel St-37 substrate. The electrochemical plating of the coatings in absence and presence of surfactants and reinforcements particles was carried out to optimize high quality coatings with appropriate mechanical and morphological features. The surfactants such as cetyltrimethylammonium bromide (CTAB), sodyumdodecyl sulfate (SDS), and saccharine affected electrodeposition plating and subsequently changed mechanical characteristics. Based on XRD results, the dominant phases in the absence of surfactants were nickel oxide (NiO), nickel, and silicon carbide (SiC), while the main phases in presence of surfactants were nickel (Ni) and SiC. The hardness of the resultant coatings was found to be from 332 to 593 (Hv) depending on the bath parameter and the reinforcements weight percentage (wt%) in the Ni matrix. Microscopic observations illustrated a cluster-like structure which consisted of some fine sphere particulates with average particle size of 65–150 nm. According to elemental mapping spectra, a homogenous distribution of nickel, silicon, and carbon particles appeared into the nickel matrix coating. Finally, the experimental outcomes demonstrated that the surfactants have significant influence on the composition of coatings, surface morphology, and mechanical properties.

Los estilos APA, Harvard, Vancouver, ISO, etc.

26

Lemus-Ruiz, José, Ana L. Salas-Villaseñor y Osvaldo Flores. "Joining of WC-Co to Ni by Direct Diffusion Bonding". Advanced Materials Research 68 (abril de 2009): 127–32. http://dx.doi.org/10.4028/www.scientific.net/amr.68.127.

Texto completo

Resumen

Solid-state direct diffusion bonding between commercially pure nickel and tungsten carbide (with 6%Cobalt) has been carried out in the temperature of 980°C and 1100°C using different holding times in argon atmosphere. Samples were successfully joined without defects or cracks on the joining interface with the exception of the one joined at 980°C for 5 min. The results showed that joining occurred by the formation of a reaction zone. Scanning electron micrographs show that different intermediate layers are formed in the reaction zone, and the width of these layers increases with an increase in bonding temperature and time. Electron probe microanalysis revealed that at any particular bonding temperature, cobalt travel into the nickel side, whereas nickel travel comparatively larger distances in the tungsten carbide side.

Los estilos APA, Harvard, Vancouver, ISO, etc.

27

Munish Baboria y Atul Singh Pathania. "An analytical investigation pertaining to autocatalytic plating of chromium nickel carbide powder on copper alloys using electroless deposition method". World Journal of Advanced Research and Reviews 17, n.º 1 (30 de enero de 2023): 291–301. http://dx.doi.org/10.30574/wjarr.2023.17.1.0002.

Texto completo

Resumen

Engineered components can gain desirable properties when coated with surface materials. Hard chromium has been given priority in material selection list while making choice for certain wear and corrosion- resistant coatings because of its desirable combination of chemical resistance, adhesion, and mechanical properties. Owing to the existing environmental safety concerns, there is restrictions on the employability of hexavalent chromium ions as plating material. This substantiates a need to develop an environmentally friendly process for alternative coatings. Today, Chromium Nickel Carbide (Cr-Ni-C) is emerging as good quality plating substrate with no the toxic compounds as compared to existing chromium complex. The purpose of this research paper is to investigate electroless processes for plating metal powder, chromium nickel carbide with nickel. These particles were successfully encapsulated with Ni by electroless deposition method using different solutions.

Los estilos APA, Harvard, Vancouver, ISO, etc.

28

LaPierre, Etienne A., Warren E. Piers y Chris Gendy. "Redox-state dependent activation of silanes and ammonia with reverse polarity (PCcarbeneP)Ni complexes: electrophilic vs. nucleophilic carbenes". Dalton Transactions 47, n.º 46 (2018): 16789–97. http://dx.doi.org/10.1039/c8dt04409k.

Texto completo

Resumen

A rigidified PC_alkylP ligand allowed for the synthesis and characterization of cationic and radical PC_CarbeneP nickel complexes in which the carbene anchor of the pincer framework is electrophilic rather than nucleophilic.

Los estilos APA, Harvard, Vancouver, ISO, etc.

29

Leng, Yonghua, Huaiyu Shao, Yuntao Wang, Masaaki Suzuki y Xingguo Li. "A New Method to Synthesize Nickel Carbide (Ni3C) Nanoparticles in Solution". Journal of Nanoscience and Nanotechnology 6, n.º 1 (1 de enero de 2006): 221–26. http://dx.doi.org/10.1166/jnn.2006.17934.

Texto completo

Resumen

Pure nickel carbide (Ni3C) nanoparticles with particle diameters of 40 nm have been prepared by thermal decomposition of nickel formate in the presence of oleic acid and oleyl amine. The co-existence of active nickel and active carbon plays an important role in the formation of metastable Ni3C. Ni3C powder decomposes at 770 K in an N2 atmosphere to yield nickel and carbon. While in an H2 atmosphere, Ni3C powder is converted into Ni at 627 K. In addition, Ni3C nanoparticles exhibit superparamagnetism and are easier to magnetize at room temperature due to their good crystallinity and few defects.

Los estilos APA, Harvard, Vancouver, ISO, etc.

30

Janoš, Miroslav y Ivan Mrkvica. "The Milling of Material Inconel 718 with Indexables Cutting Inserts from Sintered Carbide". Technological Engineering 10, n.º 1 (1 de diciembre de 2013): 9–11. http://dx.doi.org/10.2478/teen-2013-0003.

Texto completo

Resumen

Abstract In this document I am describing milling possibilities of nickel alloy Inconel 718. In the beginning is described use of nickel alloys in industry and division of nickel alloys. Further is described nickel alloy what I used - Inconel 718, on this material I make all my tests of machi-nability. Further chapters describe recommended cutting materials for nickel alloys milling. Cutters with exchan-geable sintered carbide blade plates were used as cutting tools company Pramet Tools s.r.o. Main goal was inve-stigate durability and wear of indexable cutting inserts for different cutting procedures. It was mainly about different combinations of used cutting speeds and feeds. The final part includes a summary of the results. The results are ones from first steps to definition of effective nickel alloy machining.

Los estilos APA, Harvard, Vancouver, ISO, etc.

31

Upadhyaya, G. S. y D. Banerjee. "Sintering of tungsten carbide-nickel containing chromium carbide". Metal Powder Report 51, n.º 1 (enero de 1997): 38. http://dx.doi.org/10.1016/s0026-0657(97)80135-x.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

32

Li, Hui, Feng Gao, Yan Li y Lijing Bai. "Experimental Study on Titanium Coating Carbide Drill Cutting Nickel-Base Superalloy". Metals 12, n.º 12 (13 de diciembre de 2022): 2136. http://dx.doi.org/10.3390/met12122136.

Texto completo

Resumen

A nickel-base superalloy drilling comparison test was carried out with a carbide drill of the Chinese brand YG10, which was selected and coated with TiN coating, AlTiN coating and TiAlSiN coating. Analysis of drill life, drilling force, drilling temperature, drill wear and machined surface quality were carried out. It can be seen that both TiN coating and AlTiN coating can prolong the tool life of the carbide drill YG10 when drilling nickel-base superalloy GH4169. In contrast, the TiAlSiN-coated drill has poor hardness and is easy worn, which is not suitable for processing nickel-base superalloy which has high hardness and strength. Adhesive wear is the main form of coated drill wear. As the coated drill number of drilling holes increases, the adhesion increases. Coated drills can reduce the machined surface roughness of a workpiece and improve the machined quality.

Los estilos APA, Harvard, Vancouver, ISO, etc.

33

He, Lin Jiang, Jiu Hua Xu, Hong Hua Su y Yan Chen. "Turning of Cast Inconel 718 with Coated Carbide and Whisker Reinforced Ceramic Tools". Materials Science Forum 770 (octubre de 2013): 136–40. http://dx.doi.org/10.4028/www.scientific.net/msf.770.136.

Texto completo

Resumen

Nickel-based alloy is known as one of the most difficult-to-machine materials. During the machining process, the high temperature coupled with high strength and work hardening leads to excessive tool wear, short tool life, low productivity, etc. Tool life and material removal rate are the two targets of rough machining. In this paper, some turning tests are conducted to investigate the tool lives and material removal rate of coated carbide tools and whisker reinforced ceramic tools. The results show that notch wear is the dominant failure mode for whisker reinforced ceramic tools while severe flank wear and micro-chipping for coated carbide tools. The whisker reinforced ceramic tools are more effective in machining nickel-based alloys than the coated carbide tools both in tool life and material removal rate.

Los estilos APA, Harvard, Vancouver, ISO, etc.

34

Wahab, Hassan A., M. Y. Noordin, S. Izman, Zakiah Kamdi y Denni Kurniawan. "Composition Modification of Electroplated Nickel Interlayer on Tungsten Carbide Substrate by Thermal Carburizing". Advanced Materials Research 845 (diciembre de 2013): 378–81. http://dx.doi.org/10.4028/www.scientific.net/amr.845.378.

Texto completo

Resumen

Nickel enables nucleation and growth of well oriented diamond crystals from the small lattice mismatch between nickel and diamond. However, its solubility for carbon causes carbon loss during diamond deposition and, consequently, results in poor nucleation density. In this study, carburizing of Ni/WC-Co specimens in high temperature furnace with inert gas atmosphere was adopted to provide nickel with sufficient carbon prior to diamond deposition. This process was carried out using charcoal powder as source of carbon at different treatment temperatures (750°C and 850°C) and durations (20min and 60min). Effect of the process in altering the nickel layer composition was characterized by microscopy, element analysis, and phase identification techniques. Results show that carburization leads to formation of metallic phases, such as nickel carbide and nickel cobalt, which are considered beneficial for diamond nucleation and growth.

Los estilos APA, Harvard, Vancouver, ISO, etc.

35

Hill, Ethan A., Norman Zhao, Alexander S. Filatov y John S. Anderson. "Nickel(ii)-methyl complexes adopting unusual seesaw geometries". Chemical Communications 56, n.º 57 (2020): 7861–64. http://dx.doi.org/10.1039/c9cc09249h.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

36

Tykhomyrova, Tetiana, Olena Gordienko, Ruslan Bekhter y Oleksandr Podobnyj. "Морфологія і топографія карбідної фази при легуванні сплава ЖС3ДК-ВІ гафнієм і танталом". Aerospace technic and technology, n.º 4sup2 (22 de agosto de 2022): 108–13. http://dx.doi.org/10.32620/aktt.2022.4sup2.16.

Texto completo

Resumen

This study describes the results of studying the effect of modification/micro alloying with hafnium and alloying with tantalum on the morphology and distribution of the carbide phase in the ZhS3DK-VI alloy microstructure. The carbide phase is an integral structural component of the microstructure of nickel heat-resistant alloys, has a tremendous impact on the strength characteristics of the material. In this regard, the shape, size, and distribution of particles of this phase in the microstructure are of great importance. The formation of the morphology of carbide particles largely depends on the technological factors of casting such as temperature of the ceramic mold, crystallization rate, melt temperature, etc. The higher the temperature parameters and the lower the crystallization rate during casting, the coarser the morphology and topography of carbide particles formed during solidification and, accordingly, the lower the strength characteristics of the material. However, technological parameters also affect the geometry of the casting and it is not always possible to change the technology; so the only possibility is the use of modification or alloying of the alloy upon receipt of the work piece. Such carbide-forming elements as hafnium and tantalum, due to their chemical activity, react with carbon at the stage of crystallization and form thermally stable primary MC-type carbides. The use of hafnium in nickel alloys is limited to a concentration of 0.1 % since at a higher concentration, this element and nickel form a eutectic phase, the melting temperature of which is much lower than the homogenization temperature of the alloys. It is studied the possibility of doping the ZhS3DK-VI alloy with tantalum to form a favorable morphology of the carbide phase. The dispersed carbide particles are taken in the microstructure of the ZhS3DK-VI alloy after experimental work. The chemical composition of the particles is dominated by tantalum, and there is some hafnium.

Los estilos APA, Harvard, Vancouver, ISO, etc.

37

Dong, Shyen Yang y Shou Lei Tien. "The Effect of Microstructure on Unidirectional Chilled Solidification of High Chromium White Cast Iron". Advanced Materials Research 154-155 (octubre de 2010): 1558–70. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1558.

Texto completo

Resumen

This study mainly investigates the characteristics of carbide and the matrix structure of ASTM A532–87 CLASS Ⅲ high-chromium white cast iron under directional solidification. The two components of high-chromium white cast iron were put in a 3-level Furan sand model, which is placed in a cold-water circulation copper model, producing unidirectional chilled solidification. A K-type thermocouple is employed to measure data for solidification temperature with time. The move velocities of the liquidus phase and solidus phase is calculated. The matrix and the growth characteristics of M7C3 carbide are explored. As determined from the experiment, the liquidus temperature gradient GL is 0.45~ 0.9oC/mm, and the solidus temperature gradient Gs is 4.3~6.2oC/mm. Around 300 nm of the primary carbide is formed from the added elemental nickel being less than 0.3 mm from the chilled end and from the nickel-free alloy being less than 5 mm from the chilled end. As the distance from the chilled end increases, the primary carbide gradually becomes coarser, and the distance between eutectic carbide groups is increased. This study employs EPMA to analyze the changes of primary carbide, eutectic carbide and matrix components with distance from the chilled end, as well as changes in the distributions of chemical elements.

Los estilos APA, Harvard, Vancouver, ISO, etc.

38

Abraham, D. S. Manoj, H. Kanagasabapathy, S. Kartheesan y M. C. Shaji. "Dry Sliding Wear Behaviour of Al 7075 T6 Coated by Plasma Spray Process". Advanced Materials Research 984-985 (julio de 2014): 551–56. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.551.

Texto completo

Resumen

-Al7075 T6 alloys are widely used in the aircraft, automotive and die and mold making industry, yet at any time aluminium components should be designed with a third body or in an harsh environment they must be protected with an overlying coating inorder to increase their useful lifespan and improve their surface performance especially in wear and corrosion. The most wide spread technique used to modify the surface properties of Al7075 T6 among them one of the most promosing technology is plasma spraying. It is widely used to manufacture anti-wear and anti-corrosion coatings on to a large class of bulk materials. Extreme performance and high flexibility are the Main characteristic of the coatings achievable by Plasma Spray process. In this work Nickel Carbide + Chromium Composite coating was successfully prepared and deposied with various thicknesses on the Aluminium alloy surface. Nickel Carbide + Chromium composite coating exhibits a significantly increased wear resistance property in the material. The result obtained in this work indicated that the plasma spraying method will be the promising process to coat the composite coating on aluminium based alloy.Keywords: Al 7075 T6, Plasma Spray Process, Nickel Carbide + Chromium

Los estilos APA, Harvard, Vancouver, ISO, etc.

39

Baklanova, O. N., A. V. Lavrenov, A. V. Vasilevich y O. A. Knyazheva. "THE INFLUENCE OF MECHANICAL ACTIVATION ON THE PROPERTIES SUPPORTS AND CATALYSTS OF OIL REFINING". Российский химический журнал 62, n.º 1-2 (1 de febrero de 2019): 131–40. http://dx.doi.org/10.6060/rcj.2018621-2.11.

Texto completo

Resumen

The analysis of scientific publications and patents devoted to mechanochemical synthesis of inorganic supports and catalysts of oil processing processes: cracking, reforming, hydrotreating and hydrocracking is carried out. It s shown that the introduction of mechanical activation into the technological process of synthesis of inorganic supports and catalysts, as a rule, leads to an increase in catalytic activity and selectivity. Features of mechanochemical synthesis of complex nickel-molybdenum oxides, which are precursors of sulfide nickel-molybdenum hydrotreating catalysts, were considered. It is shown that under conditions of mechanical activation, it is possible to obtain a nickel-molybdenum highly active and thermostable β-NiMoO4, in which Mo is in a tetrahedral conformation. The technology of obtaining highly dispersed carbide-containing catalysts developed using the IHCP SB RAS using the method of mechanical activation is described. The texture and morphology of synthesized highly disperse massive carbide-containing catalysts are considered. It is shown that the size of active particles is 2–5 nm. Model catalytic tests have been carried out and it has been established that carbide-containing highly disperse catalysts exhibit high catalytic activity in the model hydrodesulphurization reaction of dibenzothiophene.

Los estilos APA, Harvard, Vancouver, ISO, etc.

40

Shilov, Ivan, Andrey Smirnov, Olga Bulavchenko y Vadim Yakovlev. "Effect of Ni–Mo Carbide Catalyst Formation on Furfural Hydrogenation". Catalysts 8, n.º 11 (19 de noviembre de 2018): 560. http://dx.doi.org/10.3390/catal8110560.

Texto completo

Resumen

High-loading Ni–Mo carbide catalysts were prepared by the modified gel-combustion method under various thermal treatment conditions. All samples were studied by X-ray diffraction (XRD) analysis, which showed that the catalysts could contain cubic and hexagonal molybdenum carbides, nickel, nickel oxide and Ni–Mo solid solutions, depending on the thermal treatment conditions. Study of catalyst activity and selectivity in the hydrogenation of furfural was carried out in a batch reactor at 150 °C and hydrogen pressure 6.0 MPa. Analysis of the reaction products showed that the highest yields of 2-methylfuran (2-MF) and furfuryl alcohol (FA) were achieved using catalysts synthesized by calcination of the nickel-molybdenum-carbon precursor at 400 °С with the following reduction in a stream of hydrogen at 600 °C. The best results for production of FA with a yield of 80 mol % and 2-MF with a yield of 29 mol % were observed using Ni6MoC–SiO2 (400/600) and Ni1MoC–SiO2 (400/600) catalysts, respectively. It has been shown that the addition of nickel to the carbide molybdenum catalyst significantly increases the activity of the catalytic systems. In addition, nickel also contributes to the formation of products formed by hydrogenation of the aromatic ring tetrahydrofurfuryl alcohol (THFA) and 2-methyltetrahydrofuran (2-MTHF).

Los estilos APA, Harvard, Vancouver, ISO, etc.

41

Bretzler, Patrick, Michael Huber, Simon Nickl y Klaus Köhler. "Hydrogenation of furfural by noble metal-free nickel modified tungsten carbide catalysts". RSC Advances 10, n.º 46 (2020): 27323–30. http://dx.doi.org/10.1039/d0ra02003f.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

42

Therrien, J. A., M. O. Wolf y B. O. Patrick. "Synthesis and comparison of nickel, palladium, and platinum bis(N-heterocyclic carbene) pincer complexes for electrocatalytic CO2 reduction". Dalton Transactions 47, n.º 6 (2018): 1827–40. http://dx.doi.org/10.1039/c7dt04089j.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

43

Bepari, Md Mohar Ali y Mohiuddin Ahmed. "Effect of Chromium and Nickel Additions on the Transformation Characteristic and Ferrite Grain Size Refinement of Low Carbon Structural Steels Containing 0.13% C". Applied Mechanics and Materials 860 (diciembre de 2016): 158–64. http://dx.doi.org/10.4028/www.scientific.net/amm.860.158.

Texto completo

Resumen

The effect of small addition of chromium and nickel alone or in combination on the transformation characteristic and ferrite grain size of low carbon (0.13%C) structural steels have been studied by cooling suitable steels at four different cooling rates ranging from 120°C/min to 3.6° C/min from temperatures giving a constant austenite grain size of 37 μm. Radio Frequency generator with control system was used for the heat treatment of the steel samples. Optical microscopy of the heat treated samples was carried out. Ferrite grain size was determined from the fictitious ferrite grain size measured by mean linear intercept method and the volume fraction of pearlite obtained by optical microscopy and point counting. It was found that although the heat treatment of the steels was started from a common austenite grain size, their subsequent ferrite grain size after cooling at the same cooling rate were not the same. Both chromium and nickel enhance the formation of Widmanstatten structure. But chromium is more effective than nickel in the formation of Widmanstatten structure. It was also found that the undissolved particles of chromium carbide (Cr2C) present during austenitizing have no role in determining the ferrite grain size. The precipitating particles of chromium carbide (Cr2C) are excellent ferrite grain size refiners. Nickel refines the ferrite grain size. In presence of nickel, Cr2C precipitates are less effective than Cr2C precipitates in absence of nickel in the refinement of ferrite grain size.

Los estilos APA, Harvard, Vancouver, ISO, etc.

44

Kale, Sumeet S., Juan M. Asensio, Marta Estrader, Mayke Werner, Alexis Bordet, Deliang Yi, Julien Marbaix, Pier-Francesco Fazzini, Katerina Soulantica y Bruno Chaudret. "Iron carbide or iron carbide/cobalt nanoparticles for magnetically-induced CO2 hydrogenation over Ni/SiRAlOx catalysts". Catalysis Science & Technology 9, n.º 10 (2019): 2601–7. http://dx.doi.org/10.1039/c9cy00437h.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

45

Celik, Ilhan y Bayram Benli. "The effect of WC-12Co and CrC-NiCr hard coatings applied by HVOF method on the microstructure, mechanical, and surface properties of steel". Metallurgical Research & Technology 121, n.º 3 (2024): 318. http://dx.doi.org/10.1051/metal/2024034.

Texto completo

Resumen

In today’s world, the use of metals is widespread across various industries, with St37 steel plying a significant role. However, over time, this metal undergoes significant deterioration in its mechanical and physical properties, mainly due to factors such as corrosion and wear. Rather than using expensive methods such as alloying to extend the life of the metal, a more economical and practical approach is to focus on improving the surface properties. Surface engineering techniques, particularly thermal spraying, offer a viable solution. Among thermal spray techniques, High Velocity Oxygen Fuel (HVOF) spraying stands out as an economical and time-saving method for producing materials, equipment or machine components with high resistance to damage mechanisms such as corrosion, erosion and wear. This study investigates the application of tungsten carbide and chromium carbide-nickel chromium coatings to St37 steel surfaces using the HVOF method. Microhardness measurements were carried out after coating to evaluate the mechanical properties, while scratch and wear tests were carried out to determine the tribological properties. In addition, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to assess the structural characteristics of the samples. The results indicate the formation of phases such as Cr3C2, NiCr and W2C on the low-alloy steel surface after the tungsten carbide and chromium carbide-nickel-chromium coating processes. Coating thicknesses of 204 and 239 µm were achieved for tungsten carbide and chromium carbide-nickel-chromium, respectively. These coatings contributed to improved mechanical and tribological properties. The WC-12Co coated sample exhibited the highest hardness value (1304 HV0.1), while the CrC-NiCr coated sample recorded the highest critical load value in the scratch test (48 N). The WC-12Co coated samples showed the best wear resistance.

Los estilos APA, Harvard, Vancouver, ISO, etc.

46

Greaves, Megan E., Elliot L. B. Johnson Humphrey y David J. Nelson. "Reactions of nickel(0) with organochlorides, organobromides, and organoiodides: mechanisms and structure/reactivity relationships". Catalysis Science & Technology 11, n.º 9 (2021): 2980–96. http://dx.doi.org/10.1039/d1cy00374g.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

47

Babalola, Saheed Adeoye, Kenneth Kanayo Alaneme, Samuel Ranti Oke, Lesley Heath Chown, Nthabiseng Beauty Maledi y Michael Oluwatosin Bodunrin. "Hot compression behaviour and microstructural evolution in aluminium based composites: an assessment of the role of reinforcements and deformation parameters". Manufacturing Review 8 (2021): 6. http://dx.doi.org/10.1051/mfreview/2021004.

Texto completo

Resumen

The response of two different types of aluminium matrix composites (AMCs) reinforced with silicon carbide ceramic particulates or nickel metallic particulates to hot compression testing parameters was evaluated. The composites were produced via two-step stir-casting technique. Axisymmetric compression testing was performed on the samples at different deformation temperatures of 220 and 370 °Ϲ, 0.5 and 5 s−1 strain rates and total strains of 0.6 and 1.2. The initial and post-deformed microstructures were studied using optical and scanning electron microscopy. The results show that flow stress was significantly influenced by imposed deformation parameters and the type of reinforcements used in the AMCs. Nickel particulate reinforced aluminium matrix composite (AMC) showed superior resistance to deformation in comparison with silicon carbide reinforced AMC under the different testing conditions. In both AMCs, work hardening, dynamic recovery and dynamic recrystallisation influenced their response to imposed parameters. The signature of dynamic recrystallisation was very apparent in aluminium matrix composite reinforced with nickel particulates.

Los estilos APA, Harvard, Vancouver, ISO, etc.

48

Bock, Hans y Hans Peter Wolf. "Oberflächen-Reaktionen, 9 Dehydrohalogenierungen von Halogenkohlenwasserstoffen an Raney-Nickel / Surface Reactions, 9 Dehydrohalogenation of Halohydrocarbons at Raney Nickel". Zeitschrift für Naturforschung B 44, n.º 6 (1 de junio de 1989): 699–714. http://dx.doi.org/10.1515/znb-1989-0614.

Texto completo

Resumen

Raney nickel, a highly reactive and air-sensitive solid, if prepared and investigated under oxygen-free conditions, exhibits interesting catalytic properties. Using photoelectron spectroscopy for real-time gas analysis in a flow reactor, the following results are obtained with alkyl and acylhalides: Dehydrohalogenation temperatures are lowered relative to thermal HHal elimination up to 350 K. Monochloro and bromo propanes and butenes yield propene and butadiene, respectively. 1,1-Dichloro ethane or 1,1-dibromo propane only split off one HHal and form chloroethene or 1-bromopropene-2. HCl elimination from 2-methyl propionic acid chloride, expectedly, produces dimethyl ketene. Most interesting, however, is the ring opening of monobromo cyclobutane to 1-bromo-butene-3, observed already at room temperature, which strongly suggests the intermediate formation of a chemisorbed surface carbene at Raney nickel. The formation of hexadiene-1,5 as a by-product in the HCl elimination of 1-chloropropane, i. e. a surface carbene dimer, indicates their presence also in other dehydrohalogenations heterogeneously catalyzed by Raney nickel.

Los estilos APA, Harvard, Vancouver, ISO, etc.

49

Zhao, Zhi Long, Chang Hui Ai y Lin Liu. "The Effect of Grain Size on Cutting Force in End Milling of Inconel 718C". Materials Science Forum 654-656 (junio de 2010): 484–87. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.484.

Texto completo

Resumen

Inconel 718C is a nickel-base alloy that is difficult to machine. This paper presents a study of the influence of grain size in as-cast workpieces on cutting forces of Inconel 718C. The end milling tests were performed to understand the effect of various grain structures on machinability of nickel-base superalloy under wet condition using carbide insert. The collected data of cutting forces were analyzed using polynomial regression methods. The results show that grain refining of Inconel 718C can effectively decrease cutting force and improve the machinability of nickel-base superalloy.

Los estilos APA, Harvard, Vancouver, ISO, etc.

50

Nakonechna, O. I., D. A. Stratiichuk, A. M. Kuryliuk y N. N. Belyavina. "Features of cubic Ni3C and NiC carbides obtained by HT-HP sintering". Physics and Chemistry of Solid State 23, n.º 1 (27 de enero de 2022): 34–39. http://dx.doi.org/10.15330/pcss.23.1.34-39.

Texto completo

Resumen

In this work NiC carbides were manufactured by HP-HT sintering of mechanically alloyed charges of the elemental Ni–carbon nanotubes (CNT) or Ni–Graphite. Structural features of the materials obtained were characterized by X-ray diffraction and scanning electron microscopy. X-ray diffraction studies have revealed that the crystal lattice of nickel carbide obtained from mechanically alloyed Ni–CNT charge is supplemented with additional Carbon atoms from the graphite shell of the high-pressure cell at HT-HP sintering. On the other hand, nickel carbide fabricated from mechanically alloyed Ni–Graphite charge retains its composition. It is shown that materials studied in this work demonstrate an advanced value of microhardness (up to 7 GPa).

Los estilos APA, Harvard, Vancouver, ISO, etc.

Artículos de revistas sobre el tema "Carbure de nickel"

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros