A facile pathway to prepare molybdenum boride powder from molybdenum and boron carbide

Wang, Yu; Zhang, He; Jiao, Shuqiang; Chou, Kuo‐Chih; Zhang, Guohua

doi:10.1111/jace.16984

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…When one increases the content of Mo up to ~8 % of weight the grain sizes of (Ti, Mo)B 2 and (Ti,Mo)C are reduced from ~100 to ~10 µm, while the coating hardness increases from 900 to 1,300 HV. One of the arguments confirming the possibility of the formation of molybdenum borides of various composition from the reaction mixture of Mo+B 4 C is given in work [15], which shows the fundamental possibility of obtaining a series of Mo x B y compounds by heating the Mo/B 4 C mixture over a temperature range of 1,273-1,673 K.…”

Section: Literature Review and Problem Statementmentioning

confidence: 88%

In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

Prysyazhnyuk¹,

Shlapak²,

Ivanov³

et al. 2020

EEJET

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This paper reports a study into the formation of the phase composition, structure, and properties of arc welding coatings by the flux-cored electrode materials from the Fe-MoB -C system. The welding alloys were applied using the flux-cored arc welding (FCAW) electrodes, which consisted of a shell made from the low-carbon steel filled with a reaction powder mixture that contained boron carbide and molybdenum in a ratio of 1:1. The calculation of the phase composition of alloys that correspond to the surfaced layers by a CALPHAD method using the Thermo-Calc OpenCalphad software shows that under the equilibrium conditions the boride phases of molybdenum and ferrite cannot co-exist. The main phase of such alloys is a FeMo 2 B 2 compound, which forms the eutectics with austenite. Given that the eutectic structures with borides are characterized by high brittleness, the introduction of components was conducted in the form of a reaction mixture in order to obtain the in situ formed boride phases in the form of separate structural components. Analysis of the results of studying the microstructure and phase composition of coatings reveals that they consist of three main structural components: the eutectic (FeMo 2 B 2 +ferrite) and the grains of molybdenum tetraboride MoB 4. Thus, under the conditions of arc welding using the reaction mixture, an irregular structure is formed, which is favorable in terms of ensuring wear resistance due to the high microhardness of MoB 4 >27 GPa. The hardness of the coatings obtained is at the level of 63-65 HRC, and the wear resistance is higher compared to standard high-chromium alloys (grades Т620 and Т590) by 2-2.5 times. This makes it possible to recommend the coating of a given system for hardfacing the working surfaces of equipment in the coal, processing, woodworking industries, etc., where abrasive wear is the dominant type of surface wear

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Section: Literature Review and Problem Statementmentioning

confidence: 88%

In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

Prysyazhnyuk¹,

Shlapak²,

Ivanov³

et al. 2020

EEJET

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show abstract

“…can be synthesized by high temperature (>1200 K) and by high pressure (≈5.2 GPa) sintering ( Figure 4 a ). [ 4 , 17 , 34 ] It is reported that by annealing the varied mixture of B/Mo precursor (molar ratio: 0.5, 1.0. 2.5, 4, etc.)…”

Section: Synthesis Of Molybdenum Boridesmentioning

confidence: 99%

“…As a d‐block element with multiple oxidation states, molybdenum‐based borides show properties such as low cost, facile synthesis, structural diversity, high chemical stability, corrosion resistance, high hardness, and capability to replace precious metal catalysts. [ 17 , 18 , 19 , 20 ] Molybdenum‐based borides (molybdenum borides) are found in different stoichiometries and crystal structures namely α‐MoB, Mo 2 B, β‐MoB, α‐MoB 2 , β‐MoB 2 , Mo 2 B 4 , and Mo 2 B 5 , etc. [ 5 , 19 , 20 , 21 , 22 ] The abundant structures of Mo borides represent interesting chemical and mechanical properties which are established by the rearrangement and proportion of boron and molybdenum atoms in a unit cell.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments and Future Perspectives of Molybdenum Borides and MBenes

Rout,

Shinde,

Patra

et al. 2024

Advanced Science

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Metal borides have received a lot of attention recently as a potentially useful material for a wide range of applications. In particular, molybdenum‐based borides and MBenes are of great significance, due to their remarkable properties like good electronic conductivity, considerable stability, high surface area, and environmental harmlessness. Therefore, in this article, the progress made in molybdenum‐based borides and MBenes in recent years is reviewed. The first step in understanding these materials is to begin with an overview of their structural and electronic properties. Then synthetic technologies for the production of molybdenum borides, such as high‐temperature/pressure methods, physical vapor deposition (PVD), chemical vapor deposition (CVD), element reaction route, molten salt‐assisted, and selective etching methods are surveyed. Then, the critical performance of these materials in numerous applications like energy storage, catalysis, biosensors, biomedical devices, surface‐enhanced Raman spectroscopy (SERS), and tribology and lubrication are summarized. The review concludes with an analysis of the current progress of these materials and provides perspectives for future research. Overall, this review will offer an insightful reference for the understanding molybdenum‐based borides and their development in the future.

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Preparations of Molybdenum/Tungsten Borides by Boriding Molybdenum/Tungsten Powder with Boron Nitride

Wang

Liu

et al. 2022

JOM

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A facile pathway to prepare molybdenum boride powder from molybdenum and boron carbide

Cited by 12 publications

References 30 publications

In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

In situ formation of molybdenum borides at hardfacing by arc welding with flux-cored wires containing a reaction mixture of B4C/Mo

Recent Developments and Future Perspectives of Molybdenum Borides and MBenes

Preparations of Molybdenum/Tungsten Borides by Boriding Molybdenum/Tungsten Powder with Boron Nitride

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