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- W4386880090 abstract "Hexagonal BN-coated powders have been widely used in various engineering sectors, however, their productions are restricted by the complexity of gas-solid reactions. In this study, guided by thermodynamics, a novel approach to synthesize Layer-structured hexagonal BN (hBN)-coated high entropy diboride powders in vacuum was developed, using metal salt Zr(NO3)4·5H2O, HfCl4, NbCl5, TaCl5, C16H36O4Ti, boric acid, and sucrose as raw materials. By adjusting the ratio of carbon to metal source (C/M), powders only consisting of two boride solid solutions and hBN were finally obtained, under an optimal processing condition of C/M = 5.5 and synthesis temperature of 1400°C. Parts of hBN were found to coat on high-entropy metal diborides ceramic (HEB) particles, corresponding formation mechanism for core-shell structured powders was investigated, together with the liquid precursor assisted boro/carbothermal reduction process. Starting from as-synthesized core-shell powders, (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2-11 vol% hBN ceramics were densified at 1900°C under 50 MPa without holding, with a high relative density of 97.3%." @default.
- W4386880090 created "2023-09-21" @default.
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- W4386880090 date "2023-09-01" @default.
- W4386880090 modified "2023-09-29" @default.
- W4386880090 title "Thermodynamics aided design of hBN-capsulated diboride powders from novel nitrate precursors for high entropy ceramics" @default.
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- W4386880090 doi "https://doi.org/10.1016/j.jmst.2023.08.034" @default.
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