Cost effective preparation of Si3N4 ceramics with improved thermal conductivity and mechanical properties

被引：43

作者：

Duan, Yusen ^{[1
,2
]}

Liu, Ning ^{[1
]}

Zhang, Jingxian ^{[1
,3
]}

Zhang, Hui ^{[1
,3
]}

Li, Xiaoguang ^{[1
]}

机构：

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

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, SICCAS Shanghai Inst Ceram, Suzhou Inst, Taicang 215499, Jiangsu, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2020年 / 40卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Silicon nitride; Gas pressure sintering; Thermal conductivity; Nitridation process; Mechanical properties; BONDED SILICON-NITRIDE; PHASE-TRANSFORMATION; OXYGEN-CONTENT; POWDER; MICROSTRUCTURE; SI; BETA-SI3N4; ADDITIVES; KINETICS; GROWTH;

D O I：

10.1016/j.jeurceramsoc.2019.10.003

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：

High-purity silicon powder is used as the starting material for cost-effective preparation of silicon nitride ceramics with both high thermal conductivity and excellent mechanical properties using RE2O3 (RE= Y, La or Er) and MgO as sintering additives. Nitridation is a key procedure that would affect the properties of green bodies and the sintered samples. The beta: (alpha+beta) ratio can be increased as the samples nitrided at 1450 degrees C and a large amount of long rod-like beta-Si3N4 grains were developed in the samples. It was found that the addition of Er2O3-MgO could help to improve the mechanical properties of the sintered Si3N4 ceramics, the thermal conductivity, flexural strength and fracture toughness of the sample were 90 W/(m.K), 953 +/- 28.3 MPa and 10.64 +/- 0.61 MPa.m(1/2), respectively. The RE3+ species with larger ionic radius tended to increase the oxygen of nitrided samples and decrease N/O ratio (triangle grain boundary) of sintered samples.

引用

页码：298 / 304

页数：7

共 36 条

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