The Microstructure and Mechanical Properties of Porous Silicon Nitride Ceramics Prepared via Novel Aqueous Gelcasting

被引：40

作者：

Wan, Tao ^{[1
,2
]}

Yao, Dongxu ^{[1
]}

Yin, Jinwei ^{[1
]}

Xia, Yongfeng ^{[1
]}

Zuo, Kaihui ^{[1
]}

Zeng, Yuping ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Grad Univ Chinese Acad Sci, Beijing 100039, Peoples R China

来源：

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY | 2015年 / 12卷 / 05期

基金：

中国国家自然科学基金;

关键词：

WATER-SOLUBLE COPOLYMER; DIELECTRIC-PROPERTIES; STARCH CONSOLIDATION; SI3N4; CERAMICS; FABRICATION; OXYNITRIDE; ADDITIVES;

D O I：

10.1111/ijac.12424

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：

A novel aqueous gelcasting technique was employed to prepare porous silicon nitride ceramics using water-soluble copolymer of isobutylene and maleic anhydride (Isobam) as both dispersant and gelling agent. The effects of fabrication parameters, including sintering additives, the second phase (BN), and pore-forming agent (corn starch), on the microstructure and mechanical properties were separately investigated. The sample with Yb2O3 as sintering additive, having a porosity of similar to 48.6%, showed a high flexural strength of 233MPa and a high fracture toughness of 2.72MPam(1/2). With addition of 2.5wt% BN, the sample exhibited a high flexural strength of 211MPa due to the uniform microstructure with -Si3N4 grains. A high porosity of similar to 60% and a flexural strength of 110MPa were obtained by adding 20wt% starch into the sample.

引用

页码：932 / 938

页数：7

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