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- W2972876829 abstract "Tungsten diboride and tetra-boride were synthesized by a combination of mechanochemical method and the subsequent heat treatment. To clarify the formation process of tungsten diboride (WB2) and tetra-boride (WB4) using W-B mixture system with variable B concentration, the effects of ball-to-powder ratio, W to B molar ratio on mechanochemical process were studied, and the relationship between phase composition and annealing temperature was built. The results show that, the synthesis of WB2 with W:B = 1:5 can be improved by increasing ball-to-powder ratio from 4:1 to 6:1, but no WB4 phase can be directly synthesized by mechanochemical method. WB2 (AlB2-WB2, P6/mmm) phase can be only synthesized with W to B molar ratio of 1:4 and 1:5. Further increase in B content to W:B = 1:6 or less, W was present as the main phase with high crystallinity (>71%). WB4 phase was formed as an annealing temperature as low as 1000°C, which was not stable and may decompose to WB2 (WB2-WB2, P6/mmm) phase with the increase in temperature. The decomposition temperature of WB4 can be improved by increasing the B content. Compared with the W-B mixtures (W:B = 1:12) being milled for 1 hour, the powders milled for 40 hours present 20% higher of WB4 weight fraction after being annealed at 1400°C for 2 hours." @default.
- W2972876829 created "2019-09-19" @default.
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- W2972876829 date "2019-09-18" @default.
- W2972876829 modified "2023-09-29" @default.
- W2972876829 title "Mechanochemical synthesis and annealing of tungsten di‐ and tetra‐boride" @default.
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- W2972876829 doi "https://doi.org/10.1111/jace.16788" @default.
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