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• W2803578296 abstract "Abstract Ta 1− x H f x B 2 material is attractive for various aerospace applications. In this study, 2 low‐cost approaches were adopted to synthesize nanocrystalline Ta 0.5 Hf 0.5 B 2 solid solution and related composite powders. The first was based on carbothermal reduction reaction ( CTR ) of intimately mixed tantalum‐hafnium‐boron oxide(s) and carbon obtained from aqueous solution processing of TaCl 5 , HfCl 4 , B 2 O 3 , and sucrose as precursors. It was found that when using this method, due to the low solubility of each other for Ta 2 O 5 and HfO 2 and the difference in reactivity of those 2 oxides with carbon (as well as B 2 O 3 ), individual TaB 2 (‐rich) and HfB 2 phases always form separately. Those borides tend to remain phase separated due to the slow inter‐diffusion between them. However, it was observed that addition of copper “catalyst” noticeably accelerates the inter‐diffusion and the solid solution formation. The second approach was based on alkali metal reduction reaction, in which TaCl 5 and HfCl 4 are directly reacted with sodium borohydride (Na BH 4 ). This method yields a single phase Ta 0.5 Hf 0.5 B 2 solid solution nanopowders in one step at much lower temperatures (e.g., 700°C) by avoiding the oxides formation and the associated phase separation of individual borides as observed in the CTR ‐based process." @default.
• W2803578296 created "2018-06-01" @default.
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• W2803578296 date "2018-06-05" @default.
• W2803578296 modified "2023-09-25" @default.
• W2803578296 title "Phase control during synthesis of nanocrystalline ultrahigh temperature tantalum‐hafnium diboride powders" @default.
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• W2803578296 doi "https://doi.org/10.1111/jace.15783" @default.
• W2803578296 hasPublicationYear "2018" @default.
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