TAILORED MICROSTRUCTURES OF SILICON-NITRIDE CERAMICS

被引：54

作者：

HOFFMANN, MJ

PETZOW, G

机构：

[1] Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Pulvermetallurgisches Laboratorium, D-70569 Stuttgart

来源：

PURE AND APPLIED CHEMISTRY | 1994年 / 66卷 / 09期

关键词：

D O I：

10.1351/pac199466091807

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The microstructural evolution in Si3N4 ceramics is analysed by studies of pressureless and gas pressure sintered materials. Parameters controlling the size and aspect ratio of elongated grains are discussed, based on the assumption that only pre-existing beta-Si3N4 particles of the starting powder grow. Furthermore, it shown that the grain morphology is also controlled by the sintering additives due to their influence on the surface energy of Si3N4 crystals. Microstructures are also related to strength as well as toughness measurements at room temperature. It is demonstrated that strength decreases with increasing grain size, but controlled grain growth could significantly improve fracture toughness, reliability and thermal shock-behaviour.

引用

页码：1807 / 1814

页数：8