Ordered coalescence of nanocrystallites contributing to the rapid anisotropic grain growth in silicon nitride ceramics

被引：23

作者：

Hu, Jianfeng ^{[1
]}

Shen, Zhijian ^{[1
]}

机构：

[1] Stockholm Univ, Dept Mat & Environm Chem, Arrhenius Lab, S-10691 Stockholm, Sweden

来源：

SCRIPTA MATERIALIA | 2013年 / 69卷 / 03期

基金：

瑞典研究理事会;

关键词：

Abnormal grain growth; Phase transformations; Interface defects; Spark plasma sintering; HREM; SI3N4; MICROSTRUCTURE; KINETICS; TRANSFORMATION;

D O I：

10.1016/j.scriptamat.2013.04.017

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Microstructural characterization is performed on two dense Si3N4 ceramic samples consolidated by spark plasma sintering (SPS): one fabricated using alpha-Si3N4 and the other using beta-Si3N4 as the starting powder. A novel mechanism is revealed where ordered coalescence of nano beta-crystallites accelerate the rapid beta-Si3N4 anisotropic grain growth. The rapid alpha- to beta-Si3N4 phase transformation via a high supersaturation of dissolved Si3N4 in the melt favors this mechanism. The high heating rate by SPS is essential for achieving such supersaturation. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：270 / 273

页数：4

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