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

页码：253 / 258

页数：6

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