Fabrication of porous Si3N4 ceramics with controlled porosity by milling of fibrous α-Si3N4 powder

被引：0

作者：

Xu, Zhaoyun ^{[1
]}

Zhang, Yaming ^{[1
]}

Wang, Bo ^{[1
]}

Yang, Jianfeng ^{[1
]}

Liu, Kaikai ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

来源：

JOURNAL OF CERAMIC PROCESSING RESEARCH | 2016年 / 17卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Fibrous alpha-Si3N4; Porous ceramics; Porosity; Flexural strength; SILICON-NITRIDE CERAMICS; MECHANICAL-PROPERTIES; MICROSTRUCTURE; COMPOSITES; REDUCTION;

D O I：

暂无

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：

Porous Si3N4 ceramics with varied porosities were prepared by liquid phase sintering of fibrous alpha-Si3N4 powder with different morphology after ball milling. The influence of the ball milling time on porosity, shrinkage, microstructure and mechanical properties of Si3N4 ceramics were investigated. With increasing of the ball milling time from 0 h to 24 hrs, the mean length and aspect ratio of the fibrous alpha-Si3N4 particles decreased dramatically, resulting in the porosity of porous Si3N4 ceramics decreased from 55.6% to 19.3%. With the decreased length of the fibrous alpha-Si3N4 particles, microstructures with decreased aspect ratio of beta-Si3N4 grains were formed, as a result of increased nuclei number and limited grain growth of the beta-Si3N4 grains. The flexural strength varied from 62 MPa to 205 MPa could be obtained attributed to the synergy effect of porosity and microstructure.

引用

页码：840 / 844

页数：5

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