Phase Formation During Nitriding of Vanadium Disilicide

被引：1
|
作者：
Krushinskaya, L. A. [1 ]
Makarenko, G. N. [1 ]
Kotko, A. V. [1 ]
Uvarova, I. V. [1 ]
机构：
[1] Natl Acad Sci Ukraine, Frantsevich Inst Problems Mat Sci, Kiev, Ukraine
来源：
POWDER METALLURGY AND METAL CERAMICS | 2015年 / 54卷 / 5-6期
关键词：
phase formation; composite powder; silicon nitride; vanadium disilicide; nitriding; nanoparticles; aggregates;
D O I：
10.1007/s11106-015-9707-6
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The evolution of microstructural and phase transformations during nitriding of mechanically preactivated vanadium disilicide powder is investigated by X-ray diffraction, chemical analysis, and transmission electron microscopy. It is established that, in the initial stage of nitriding (1000-1100 degrees C), the phase formation is accompanied by the dispersion of near-surface zones of VSi2 particles and the formation of V2N and alpha-modification silicon nitride. With increase in the nitriding temperature, the phase formation is accompanied by the delamination of particles and the formation of mainly VN and silicon nitride of alpha- and beta-modifications. Nitriding of a mechanically activated vanadium disilicide powder at 1400 degrees C enables synthesizing a fine silicon nitride-vanadium nitride composite powder in a single process. The synthesized powder is formed as loose aggregates consisting of 50 nm particles.
引用
收藏
页码：253 / 258
页数：6
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