Initial stage of Free Pressureless Spark-Plasma Sintering of vanadium carbide: Determination of surface diffusion parameters

被引：24

作者：

Giuntini, Diletta ^{[1
]}

Wei, Xialu ^{[1
]}

Maximenko, Andrey L. ^{[2
]}

Wei, Li ^{[1
]}

Ilyina, Alexandra M. ^{[2
]}

Olevsky, Eugene A. ^{[1
,2
]}

机构：

[1] San Diego State Univ, San Diego, CA 92182 USA

[2] Engn Phys Univ, Moscow 115409, Russia

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2013年 / 41卷

基金：

美国国家科学基金会;

关键词：

Spark plasma sintering (SPS); Field assisted sintering (FAST); Surface diffusion; Activation energy; Inter-particle neck; WC-VC-CO; GRAIN-GROWTH; MECHANICAL-PROPERTIES; FUNDAMENTAL-ASPECTS; CEMENTED CARBIDES; SILICON-CARBIDE; MICROSTRUCTURE; DENSIFICATION; COMPOSITES; INTERFACE;

D O I：

10.1016/j.ijrmhm.2013.06.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Inter-particle neck growth kinetics of vanadium carbide powder during initial stages of conventional and spark-plasma sintering has been investigated. Vanadium carbide (V8C7) micron-size powder has been subjected to both Free Pressureless Spark Plasma Sintering (FPSPS) and conventional sintering dilatometry. While the latter resulted not to be effective in the consolidation process, FPSPS procedure proved to be successful in terms of the initial stages of densification and inter-particle neck evolution, even without applying an external load. FPSPS was conducted with and without holding time, in order to obtain experimental data on the inter-particle contact growth for different temperature regimes. The neck sizes derived from scanning electron microscopy observations were utilized in the inverse regression of the surface diffusion equation and led to the calculation of the value of the surface diffusion activation energy for the vanadium carbide powder. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：501 / 506

页数：6

共 55 条

[1] Vanadium carbide coatings on die steel deposited by the thermo-reactive diffusion technique [J].