期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 101, 期 7, 页码 3205-3221出版社
WILEY
DOI: 10.1111/jace.15428
关键词
amorphous; crystals; crystallization; mechano-chemical synthesis; microstructure; SiBCN
资金
- National Natural Science Foundation of China [51072041, 50902031, 51621091, 51021002]
Amorphous boron-rich SiBCN were prepared by high-energy ball-milling of the mixtures of Si, graphite, h-BN, and inorganic boron, which acted as extra boron source. The solid-state amorphization, thermal stability, and crystallization of the boron-rich SiBCN were studied in detail. It was suggested that mechanical alloying can drive solid-state amorphization but also can be an initiation step for the nucleation of nanocrystals. The amorphous networks of Si-C, C-B, C-C, C-N, B-N, and C-B-N bonds are detected by XPS; however, solid-state NMR further confirms the formation of a new chemical environment around B atoms, BC3. The increases in boron content improve the thermal stability of SiBCN ceramics but weaken their oxidation resistance. Nano-SiC crystallizes first while BN(C) forms subsequently. Boron promoting SiC crystallization may result from the reduced hindering effects of B-N-C nanodomains that retard SiC crystallization.
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