Local chemistry changes in Si3N4 based ceramics during hot-pressing and subsequent annealing

被引：4
|
作者：
Rajan, K
Sajgalík, P
机构：
[1] Slovak Acad Sci, Inst Inorgan Chem, SK-84236 Bratislava, Slovakia
[2] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 1999年 / 19卷 / 11期
关键词：
hot pressing; electron microscopy; microstructure : final; impurities; Si3N4;
D O I：
10.1016/S0955-2219(99)00014-X
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 local chemistry changes within the triple points of the Si3N4 based ceramics are discussed The extents of Fe, Cr and Ti impurities segregation and coalescence after crystallization of the triple point were determined. These impurities were present also prior to crystallization in the glassy triple pockets but they were distributed over the whole volume of the triple pockets and were thus under the detection limits of the EDX method. The paper indicates that these coalesced impurities are responsible for cavity formation in the Si3N4 based composites studied. (C) 1999 Elsevier Science Limited. All rights reserved.
引用
收藏
页码：2027 / 2032
页数：6
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