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Transient liquid-phase to guide multiphase evolution in reactive-hot-pressed ZrB2-SiC-ZrC ceramics
Zheng, Q; Gu, H; Hu, DL; Zhang, GJ
2020-09-01
Source PublicationJOURNAL OF MATERIOMICS
ISSN2352-8478
Issue3Pages:607
SubtypeArticle
AbstractIn reactive-hot-pressed ZrB2-SiC-ZrC ceramics, ZrO2 was found to replace ZrC phase, hence leading to confusion in designing ultra-high-temperature ceramics (UHTCs). We employ high-precision X-ray diffraction and electron microscopies to reassess the phase behavior during entire reaction and densification and to reveal the evolution of multiphase relationship at different stages before reaching the final ZrB2 -SiC-ZrO2 composition. Frozen from transient liquid-phase, bulk glassy phase of 15 vol% was found to be constituted of Zr-Si-B-C-O with stable Zr:O ratio, which starts as early as in the intermediate stage to suppress ZrC in favor of SiC nucleation. In homogeneity in phase relations and microstructures results from variation in local transient liquid-phase to develop SiC phase in various modes and rates. As inferred from the earlier report of phase formation, competing reactions for ZrC and ZrB2 phases in the initial stage below 1000 degrees C were mediated via Zr-O-B-C liquid phase. Such liquid phase was moderated by stable B-O components, as initiated from surface oxides of starting powders. This picture under a continuous mother liquid phase can unify the reactions and sintering into a collective melting-nucleation-growth process, which enables and guides the evolution of multiphase relationship through several stages to reach final densification at relatively low temperature with the help of residual oxides. (C) 2020 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.
DOI10.1016/j.jmat.2020.05.001
WOS KeywordRAY-DIFFRACTION PATTERNS ; HIGH-TEMPERATURE CERAMICS ; QUANTITATIVE INTERPRETATION ; ZIRCONIUM DIBORIDE ; OXIDATION ; COMPOSITES ; MIXTURES ; CARBIDE ; MICROSTRUCTURE ; RESISTANCE
Language英语
WOS Research AreaChemistry ; Materials Science ; Physics
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27799
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Zheng, Q,Gu, H,Hu, DL,et al. Transient liquid-phase to guide multiphase evolution in reactive-hot-pressed ZrB2-SiC-ZrC ceramics[J]. JOURNAL OF MATERIOMICS,2020(3):607.
APA Zheng, Q,Gu, H,Hu, DL,&Zhang, GJ.(2020).Transient liquid-phase to guide multiphase evolution in reactive-hot-pressed ZrB2-SiC-ZrC ceramics.JOURNAL OF MATERIOMICS(3),607.
MLA Zheng, Q,et al."Transient liquid-phase to guide multiphase evolution in reactive-hot-pressed ZrB2-SiC-ZrC ceramics".JOURNAL OF MATERIOMICS .3(2020):607.
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