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Статті в журналах з теми "Nickel/Molybdenum Carbide"
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Dantas, S. L. A., Y. F. Gomes, A. L. Lopes-Moriyama, M. A. Correa, and C. P. Souza. "Molybdenum carbide doped with nanostructured nickel for application in degradation of reactive dyes." Cerâmica 66, no. 380 (December 2020): 460–66. http://dx.doi.org/10.1590/0366-69132020663802963.
Повний текст джерелаАнотація:
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.
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Shilov, Ivan, Andrey Smirnov, Olga Bulavchenko, and Vadim Yakovlev. "Effect of Ni–Mo Carbide Catalyst Formation on Furfural Hydrogenation." Catalysts 8, no. 11 (November 19, 2018): 560. http://dx.doi.org/10.3390/catal8110560.
Повний текст джерелаАнотація:
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).
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Zhang, Hui, Yan Liu, Yong Jie Yan, Han Qin Liang, Xue Jian Liu, and Zheng Ren Huang. "Wetting Behaviors of Nickel-Based Alloys on Sintered Silicon Carbide Ceramics." Key Engineering Materials 602-603 (March 2014): 274–78. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.274.
Повний текст джерелаАнотація:
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.
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Stux, Arnold M., Christel Laberty-Robert, and Karen E. Swider-Lyons. "Pechini synthesis and characterization of molybdenum carbide and nickel molybdenum carbide." Journal of Solid State Chemistry 181, no. 10 (October 2008): 2741–47. http://dx.doi.org/10.1016/j.jssc.2008.06.050.
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Chen, Tzung Ming, Yuan Ching Lin, and Jiun Nan Chen. "Analysis of Wear Behaviour of Sintering Carbide against DLC Coated and Nitriding Steel." Advanced Materials Research 579 (October 2012): 60–67. http://dx.doi.org/10.4028/www.scientific.net/amr.579.60.
Повний текст джерелаАнотація:
In this paper, tribological behaviours for sintering carbides and DLC/nitride film are discussed. During the wear test, two types of hardened steel are setting to sliding against eight series of carbide specimens in order to compare the wear mode and evaluate the wear performance of sintering carbides, which are made by different process parameters. The experiment result shows that a density ratio of sintering carbide between 86% and 99% does not have obviously different effect on wear resistance. Moreover, molybdenum binder with high diffusibility can improve the wear performance of tungsten carbide, but wear performance of titanium carbide is dependent on the amount of nickel/cobalt binder, separately. On the other hand, SAE52100 substrate absorbs the heat of friction and maintains the coated diamond-like carbon film in an excellent wear performance.
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Baklanova, O. N., A. V. Lavrenov, A. V. Vasilevich, and O. A. Knyazheva. "THE INFLUENCE OF MECHANICAL ACTIVATION ON THE PROPERTIES SUPPORTS AND CATALYSTS OF OIL REFINING." Российский химический журнал 62, no. 1-2 (February 1, 2019): 131–40. http://dx.doi.org/10.6060/rcj.2018621-2.11.
Повний текст джерелаАнотація:
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.
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Abdullahi, Umma. "Effects of Alloying Element and Heat Treatment on Mechanical Properties of Alloy Steels." International Journal of Engineering Materials and Manufacture 8, no. 3 (July 1, 2023): 67–74. http://dx.doi.org/10.26776/ijemm.08.03.2023.02.
Повний текст джерелаАнотація:
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
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Glotka, O. "Prediction carbides composition in nickel-based superalloys directional crystallization." Innovative Materials and Technologies in Metallurgy and Mechanical Engineering, no. 2 (March 18, 2021): 13–21. http://dx.doi.org/10.15588/1607-6885-2020-2-2.
Повний текст джерелаАнотація:
Objective. To study the specifics of the distribution of alloying elements in the carbides of the multicomponent system Ni-5Cr-9Co-6Al-1Ti-11.7W-1.1Mo-1.6Nb-0.15C by directional crystallization, using the calculated method of CALPHAD prediction. Research methods. To find regularities and calculate the distribution of alloying elements in the alloy, the latest CALPHAD method was chosen, and modeling of thermodynamic processes of phase crystallization was performed. The obtained results. The results of thermodynamic calculations of the chemical composition of carbides are given in the form of mathematical dependences. The equation of the influence of alloying elements on the dissolution (release) temperature of carbides is obtained. It is shown that the obtained dependences are closely correlated with the thermodynamic processes occurring in the system. Scientific novelty. It is shown that with increasing total concentration of carbide-forming elements, the chemical composition of carbides becomes more complicated. The titanium content of more than 2% leads to an increase in the temperature of the carbide liquidus, and at 4.5 % topologically densely packed phases is formed. When the concentration of molybdenum in the alloy is more than 4%, the probability of precipitating topologically close-packed phases in the structure increases markedly, which negatively affects the mechanical properties and heat resistance. Practical value. Based on an integrated approach for multicomponent heat-resistant nickel-based alloys, new regression models were obtained that allow adequately predict the chemical composition of carbides by the chemical composition of the alloy, which allowed to solve the problem of calculated prediction of carbide composition by chemical composition of the alloy.
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Czaplicka, Natalia, Andrzej Rogala, and Izabela Wysocka. "Metal (Mo, W, Ti) Carbide Catalysts: Synthesis and Application as Alternative Catalysts for Dry Reforming of Hydrocarbons—A Review." International Journal of Molecular Sciences 22, no. 22 (November 15, 2021): 12337. http://dx.doi.org/10.3390/ijms222212337.
Повний текст джерелаАнотація:
Dry reforming of hydrocarbons (DRH) is a pro-environmental method for syngas production. It owes its pro-environmental character to the use of carbon dioxide, which is one of the main greenhouse gases. Currently used nickel catalysts on oxide supports suffer from rapid deactivation due to sintering of active metal particles or the deposition of carbon deposits blocking the flow of gases through the reaction tube. In this view, new alternative catalysts are highly sought after. Transition metal carbides (TMCs) can potentially replace traditional nickel catalysts due to their stability and activity in DR processes. The catalytic activity of carbides results from the synthesis-dependent structural properties of carbides. In this respect, this review presents the most important methods of titanium, molybdenum, and tungsten carbide synthesis and the influence of their properties on activity in catalyzing the reaction of methane with carbon dioxide.
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Li, Weizuo, Zhongkui Zhao, Panpan Ren, and Guiru Wang. "Effect of molybdenum carbide concentration on the Ni/ZrO2 catalysts for steam-CO2 bi-reforming of methane." RSC Advances 5, no. 122 (2015): 100865–72. http://dx.doi.org/10.1039/c5ra22237k.
Повний текст джерелаАнотація:
This work presents an efficient approach to enhance the catalytic activity and stability of supported nickel catalysts for steam-CO2 bi-reforming of methane to synthesis gas by introducing the appropriate amount of molybdenum carbide.
Дисертації з теми "Nickel/Molybdenum Carbide"
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Kong, Jia Huey. "SINTERING PROPERTIES OF TiC-Ni-Mo CERMET USING NANOSIZED TiC POWDERS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1898.
Повний текст джерелаАнотація:
The sintering behavior to form TiC-Ni-Mo cermet using a nano-size TiC powders was investigated in flowing Argon gas at 1500°C. Nano-sized titanium carbide powders with high purity, high surface area, and low cost were synthesized from carbon coated Ti containing precursors utilizing a patented process. The sintering studies showed that an increase in theoretical density (TD) with increasing molybdenum content. TiC based cermets were characterized using X-ray diffraction (XRD), Vickers hardness, and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS). Mechanical properties, electrical conductivity and oxidation resistance results shows potential applications as interconnect for Low/Intermediate Temperature Solid Oxide Fuel Cells (SOFC) and machining tool tips.
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Hantzer, Sylvain. "Nouveaux materiaux pour la reaction d'hydrodesulfuration (hds)." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13120.
Повний текст джерелаАнотація:
Nouveau modele de phase active obtenu par interpretation des resultats de rmn du **(59)co et de microscopie electronique haute resolution pour des catalyseurs d'hydrotraitement a base de sulfure de molybdene et de cobalt. Application a d'autres systemes : nire, core, rhre et rhmo. Etude de l'empoisonnement par la porphyrine de catalyseur nimo/al::(2)o::(3)
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Dias, Probst Luiz Fernando. "Etude de la conversion des oxydes de carbone en hydrocarbures et en alcools en présence de catalyseurs au Nickel et Molybdène supportés." Poitiers, 1989. http://www.theses.fr/1989POIT2297.
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Fogeron, Thibault. "Synthèse de complexes inspirés des formiate déshydrogénases à Mo/W : application à la catalyse moléculaire de la réduction du CO2." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS132.
Повний текст джерелаАнотація:
Dans le contexte du réchauffement climatique, la recherche de sources d’énergie propres et durables est l’un des défis les plus importants de notre époque. La réduction du CO2 permettrait un stockage des énergies renouvelables et une diminution de la concentration de ce gaz dans l’atmosphère. Le développement de catalyseurs moléculaires permet d’étudier avec précision les relations entre structures et réactivités. Malheureusement, la librairie de catalyseurs homogènes existant dans la littérature est réduite. Afin de chercher de nouveaux catalyseurs potentiels, nous avons décidé de nous inspirer du site actif des formiate déshydrogénases (FDH). La synthèse de molécules mimes de ce site actif constitue un challenge intéressant. Dans cette thèse, nous décrivons l’obtention de deux ligands, inspirés de la molybdoptérine (chapitre I). L’obtention des complexes CoCp(dithiolène) a permis de mieux caractériser ces ligands (chapitre II). De plus, l’observation de la réactivité des ligands dans les conditions électrochimiques nous a permis d’anticiper leurs comportements lors des études catalytiques. L’obtention des complexes [MoO(dithiolène)2]2- à partir des ligands bio-inspirés constitue les synthèses de mimes des sites actifs des FDH les plus abouties de la littérature (chapitre III). Ce chapitre a également été l’occasion de travailler sur la généralisation de méthodologies de synthèses. Les complexes [Ni(dithiolène)2]- obtenus à partir des ligands bio-mimétiques constituent les premiers catalyseurs dithiolène pour la réduction du CO2 (chapitre IV). Ils font partie des rares complexes homogènes à base de métaux non-nobles catalysant la réduction du CO2 en formiateIn the context of global warming, the development of new sources of energy, clean and sustainable, is a key challenge of our society. The reduction of CO2 could allow the storage of renewable energies and offer an answer to the dramatic increase of CO2 in the atmosphere. Development of molecular catalysts offers the possibility of studying the structure-reactivity relationships. However, the library of existing homogeneous catalysts in the literature is quite limited. In order to find new potential catalysts, we decided to take inspiration from the active site of formate dehydrogenases (FDH). The synthesis of molecules mimicking this active site is an interesting challenge. In this thesis, we described the synthesis of two ligands inspired from the molybdopterin (chapter I). The synthesis of CoCp(dithiolène) complexes allows us to better characterize these ligands (chapter II). Moreover, the observation of the reactivity of these ligands allows us to understand their behaviour during electrocatalysis. The [MoO(dithiolene)2]2- complexes obtained from the bio-inspired ligands are,so far, the best mimics of the active site of FDH in the literature (chapter III). In this chapter, the generalization of synthetic procedure was also explored. Finally, [Ni(dithiolene)2]- synthesize from the bio-inspired ligands are the first dithiolene complexes able to reduce CO2 (chapter IV). They are among the few non-nobles metal complexes catalyzing the reduction of CO2 into formate
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Mennour, Ammar. "Caracterisation par spectroscopie infrarouge d'alumines modifiees et de catalyseurs w(mo) - ni(co) sulfures supportes sur alumine." Caen, 1987. http://www.theses.fr/1987CAEN2019.
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Das, Debanjan. "New Avenues to Transition Metal-Based Water Splitting Electrocatalysts." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4399.
Повний текст джерелаАнотація:
Solar energy is by far the most abundant renewable resource available to mankind. However, it is diffused and intermittent, and often geographically separated from that of the production results in underwhelming utilization of this resource. Inspired by photosynthesis, various efforts were made to store solar energy in form of chemical bonds than can be used when the sun is not shining. A promising approach is to produce hydrogen, a carbon-neutral energy carrier is via water splitting which requires electrocatalysts to accelerate the two half-cell reactions, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The state-of-art catalysts used for HER is Pt and for OER is IrO2/RuO2 that are prohibitively expensive.
We have developed new synthesis methodologies for various earth-abundant electrocatalysts supported heteroatom-doped carbon nanostructures and exploited for water splitting. An in-situ solid state route was developed to integrate ruthenium nanoparticles with N-doped graphene sheets which exhibited an HER activity rivalling state-of-art Pt/C over a wide pH range. In order to find further cost-effective materials, we sought inspiration from NiFe-hydrogenase (the most efficient catalyst for HER) to develop a general solid state method for bimetallic MFe@ N-doped carbon core-shell nanostructures (M = Ni, Cu, Co, Zn, Mn) as efficient total water splitting catalyst. Thereafter, a new, phosphine-free, solid state method to hybridize Co2P with N, P co-doped CNTs was developed which could also be extended to synthesize Fe2P, Ni2P and Cu3P. Moreover, glucose oxidation was attempted as a possible replacement for the kinetically sluggish OER half-cell reaction, wherein Co2P/N, P-CNTs were demonstrated to be an efficient non-enzymatic glucose sensor for the first time. Thereafter, Co-imidazolate frameworks (ZIF-67) were transformed into hierarchal Co-N-Se nanosheets via a simple selenization method. Investigations were carried out to establish a structure-property correlation between the nanostructures evolved over various interval of time along with their OER activity. Finally, an in-situ strategy was developed to hybridize N-doped graphitic carbon seets with Ni and MoxC (Mo2C and MoC) nanoparticles which exhibited resilient HER activity besides effectively accelerating OER, thereby resulting in overall water splitting that can be attributed to favorable electronic modulation between various strongly coupled components.
Частини книг з теми "Nickel/Molybdenum Carbide"
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Ferreira-Aparicio, P., S. Menad, A. Guerrero-Ruiz, and I. Rodríguez-Ramos. "Alumina supported molybdenum-nickel carbides as catalysts for the dry reforming of methane." In Spillover and Mobility of Species on Solid Surfaces, 437–44. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)80059-8.
Повний текст джерелаТези доповідей конференцій з теми "Nickel/Molybdenum Carbide"
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Maroli, B., S. Dizdar, and S. Bengtsson. "Iron-Based Hardfacing Alloys for Abrasive and Impact Wear." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0394.
Повний текст джерелаАнотація:
Abstract Iron-based hardfacing alloys are widely used to counteract abrasive and impact wear of industrial components soil in, sand and mineral processing applications. These alloys show a high performance to cost ratio as well as a low environmental impact. The wear resistance of the components hardfaced with these alloys depends on achieved coating microstructure i.e. on the alloys chemical composition, the coating method and process parameters selected. The present work focuses on iron based hardfacing alloys with varying amount of chromium, vanadium, tungsten, molybdenum, boron and carbon deposited by plasma transferred arc (PTA) overlay welding. Weldability, hardness, abrasive and impact wear of the overlays are presented and interpreted through their microstructure. The performance of the iron based overlays is compared with that of nickel-based metal matrix composite coatings with tungsten carbide (MMC) commonly used for hardfacing of parts subjected to severe abrasive wear. The hardness of the iron based overlays investigated ranges between 60 and 65 HRC while abrasive wear is typically below 20 mm3 (ASTM G65, procedure A). Microstructure consists of different primary precipitated carbides or borides, a martensitic matrix and eutectic structures.
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Wank, A., and B. Wielage. "Synthesis of BCN Coatings in Thermal Plasma Jets." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0913.
Повний текст джерелаАнотація:
Abstract The system B-C-N contains the hardest known materials like diamond, cubic boron nitride and boron carbide, which also show excellent chemical resistance. The oxidation resistance is shifted to higher temperatures in comparison to pure diamond. But pure BCN coatings cannot be produced by conventional thermal spray processes, as the materials lack both a liquid phase and sufficient ductility to permit deposition. Conventional VPS equipment is successfully applied in Thermal Plasmajet CVD processes for high deposition rate synthesis of diamond coatings. The feasibility of SiCN or boron carbide synthesis by this method has also been proven. The use of liquid precursors results in outstanding deposition rates and improved operational safety. Methylized borazine is applied for synthesis of BCN coatings in thermal plasma jets. The use of single source precursors is advantageous with concern to the homogeneity of the coating forming species stoichiometry. For long-term storage cooling is necessary, but also under ambient conditions the precursor shows sufficient stability. Plasma gun nozzles with different diameter and design are applied and evaluated with concern to the resulting coating properties. Deposition rates of up to 1,500 µm/h have been achieved with homogeneous coating thickness and morphology on areas with 50 mm diameter. No porosity is detected in SEM investigations on cross sections and fracture surfaces show a fine columnar coating morphology. XRD investigations point at an amorphous structure. Only for very high substrate temperatures the formation of crystalline boron carbide B8C and h-BN or graphite phases is detected. Oxygen contamination results in boric acid formation and therefore has to be avoided carefully. During coating deposition on mild steel substrates the formation of boride and nitride reaction zones is observed. VPS sprayed nickel or molybdenum interlayers permit to inhibit the evolution of reaction zones. Thereby BCN coatings with thicknesses of up to 10 µm are deposited without local delamination. Space resolved emission spectroscopic analyses are carried out in order to detect coating forming and intermediate species. As Thermal Plasmajet CVD is a pure gas phase deposition process, the control of the space resolved emission permits easy process control.
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Bodunde, O. P., S. M. Gao, M. Qin та W. H. Liao. "Evaluating Fretting Wear on 3D-Printed α-, β-, γ- Additives Hybridized NiTi Shape Memory Alloy". У ASME 2019 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/smasis2019-5597.
Повний текст джерелаАнотація:
Abstract Nickel-Titanium (NiTi) shape memory alloys (SMAs) are a class of promising materials for bio-implant, transportation, and aerospace applications. These interesting applications of SMA are as a result of their ability to exhibit shape memory effect (SME) and super-elasticity (SE). SMAs, especially NiTi which has been proven to have good mechanical properties, are however limited by their operational fatigue as reported in the literature. In this paper, a near equiatomic NiTi SMA was hybridized with zirconium (Zr), molybdenum (Mo) and copper (Cu), which are available and economic viable α-, β-, γ- stabilizing additives suitable for NiTi SMAs. Each of Zr, Mo, Cu were hybridized separately with the bare near equiatomic NiTi SMA. The compositional requirements for each of the sub-hybrids (NiTi-α, NiTi-β, and NiTi-γ respectively) were experimentally determined to know the optimum composition which could indicate the presence of austenitic and martensitic phases. Scan electron microscopy (SEM) was performed on each of the hybridizing additives as well as the bare equiatomic NiTi to determine their particle sizes and investigate their compatibility (between 30 and 40 microns) with the 3D printer used in the study. X-ray diffractometric (XRD) analysis also was carried out on the bare SMA and its additives to determine the presence of B2 and B19’ peaks. Afterward, NiTi-α, NiTi-β, and NiTi-γ were 3D printed to produce fretting wear test specimens and finally, the fretting wear behaviors of the NiTi hybrids were studied in detail with the objective of testing their performances under fretting wear mode as it may be required for an application. A tungsten carbide counter-body was used. The results from the characterization through XRD indicated that all of α-, β-, γ- stabilizing additives with NiTi respectively showed the presence of B2 and B19’ in the inter-metallic phases. Details of wear microstructure were reported and its information could be useful for professionals who require hybridized NiTi alloys for various engineering applications.
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Agafii, V., V. Mihailov, N. Kazak, G. Volodina та C. Cracan. "INCREASE OF WEAR RESISTANCE OF Сr18Ni10Ti STAINLESS STEEL BY METHOD OF ELECTRIC-SPARK ALLOYING WITH ELECTRODES OF REFRACTORY METALS AND GRAPHITE". У BALTTRIB. Aleksandras Stulginskis University, 2017. http://dx.doi.org/10.15544/balttrib.2017.11.
Повний текст джерелаАнотація:
The article presents the results of wear testing of stainless steel Cr18Ni10Тi treated with electrodes made of refractory metals and graphite by the method of electric-spark alloying. It was established that all electrospark coatings had a higher wear resistance than the Cr18Ni10Ti uncoated steel. Wear resistance of coatings was increased in the direction Mo + GraphiteTi + Ni W + Graphite Ti + Al + Graphite. X-ray diffraction analysis showed that molybdenum, tungsten, titanium carbides and other solid materials such as titanium nitride and nickel-titanium intermetallide are formed on the doped steel surfaces, which increased microhardness from 4.9 to 8 times and wear resistance from 1.63 to 29 times.
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Mohr, A., O. Schwabe, K. Ernst, H. Hill, and P. Kluge. "Thermal Spraying of a Novel Nickel-Free High Strength and Corrosion Resistant Austenitic Steel." In ITSC2022. DVS Media GmbH, 2022. http://dx.doi.org/10.31399/asm.cp.itsc2022p0631.
Повний текст джерелаАнотація:
Abstract Stainless austenitic steels like the 316L (1.4404) are widely applied in various applications and were also used for surface protection using thermal spraying. The reason for this is the easy processability and the high corrosion resistance. Stainless austenitic steels typically contain the following alloying elements: The formation of an austenitic microstructure is achieved by nickel (Ni). The addition of chromium (Cr) lead to good corrosion resistance due to formation of an oxide layer. For resistance against pitting corrosion, molybdenum (Mo) can be added. Also, stainless austenites usually exhibit very low carbon and nitrogen contents to prevent chromium carbides and nitrides which reduces the corrosion resistance. However, both alloying elements cannot be classified as being detrimental in stainless austenites in general. In contrast high nitrogen contents can also be used to improve the chemical properties, especially the resistance against pitting corrosion. Finally, carbon and nitrogen lead to an increase in hardness of the thermal sprayed layer. Based on this knowledge, a high-strength austenite for thermal spraying was developed. The new high strength austenite was processed by HVAF spraying with different particle distributions and parameter variations. Resulting coatings were investigated regarding the microstructure, elemental composition, hardness and corrosion properties in comparison to the standard coating material 316L.