An industrially feasible pathway for preparation of Mo nanopowder and its sintering behavior

Sun, Guodong; Zhang, Guohua; Chou, Kuo‐Chih

doi:10.1016/j.ijrmhm.2019.105039

Cited by 24 publications

(2 citation statements)

References 58 publications

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“…But the lattice expansion from Mo (9.4 cm 3 mol −1 ) to MoB (12.4 cm 3 mol −1 ) was only 1.3 times. Therefore, the reason for the larger particle size of MoB relative to Mo may be resulted from sintering and growth of the ultra‐fine molybdenum powder during the reaction process . These two reasons could cause the significant coarsening of the products.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2020

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Molybdenum boride is an ideal hard and wear-resistant material. In this study, a new method is proposed for preparing molybdenum boride, by which Mo first reacts with B 4 C to generate the mixture of molybdenum boride and C, and then the product is decarburized by molten Ca to generate CaC 2 . Pure molybdenum boride could be obtained after acid leaching to remove the by-product CaC 2 . According to the experimental and thermodynamic calculation results, it is concluded that the single-phase MoB could be successfully prepared, while Mo 2 B, Mo 2 B 5 , and MoB 4 could not be synthesized by this method. Moreover, it was found that the particle size of finally prepared MoB is determined by particle size of raw Mo powder. The residual carbon content of the product could be decreased to 0.10 wt% after first reaction at 1673 K for 6 hours and then decarburization reaction at 1673 K for 6 hours. K E Y W O R D Sborides, carbides, impurities, morphology, particle size

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Section: Resultsmentioning

confidence: 99%

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

et al. 2020

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“…microhardness firstly increased with the increasing temperature, and reached the maximum value of 359.51 HV at 1250 °C, which was about 10.7 % increase over the maximum hardness value of 321 HV obtained by thermal sintering of the same Mo powder without microwave field, [6] and also much higher than the values reported in other works. [4,14,15,26,27] Then the hardness of the compacts started to decrease when the sintering temperature further increased. The evolution of hardness could be well explained by the compromised effect of density and grain size according to the Hall-Petch equation.…”

Section: Densification Kinetics Of Mo During Microwave Sintering Processmentioning

confidence: 99%

Densification Behavior and Microstructure Evolution of Mo Manocrystals by Microwave Sintering

Wang¹,

Li²,

Hu³

et al. 2021

ES Mater. Manuf.

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Fabrication of full-densified Mo metal with fine grain size and uniform microstructure is highly desired to improve its mechanical property. In this work, microwave-field-assisted thermal sintering was utilized to promote the fast densification of Mo nanocrystals, and the compact with high relative density of 99.8 % and fine grain size of 2.09 μm was obtained at 1450 °C for 0.5 h with heating rate of 20 °C/min, which is much superior to the compact with density of 99.13 % and grain size of 7 μm fabricated by traditional thermal sintering at 1500 °C for 1 h. Further theoretical and experimental investigation reveals that effective volume heating transfer with low activation energy provides strong driven-force for densification of nanosized Mo powder at low temperature.

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Preparation of Fine-Grained W-Ni-Fe Alloys by Using W Nanopowders

He²,

Zhang

et al. 2020

Metall Mater Trans A

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An industrially feasible pathway for preparation of Mo nanopowder and its sintering behavior

Cited by 24 publications

References 58 publications

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

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

Densification Behavior and Microstructure Evolution of Mo Manocrystals by Microwave Sintering

Preparation of Fine-Grained W-Ni-Fe Alloys by Using W Nanopowders

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