Novel silicothermic reduction method to obtain Si3N4 ceramics with enhanced thermal conductivity and fracture toughness

被引：26

作者：

Wang, Weide ^{[1
,2
]}

Yao, Dongxu ^{[1
]}

Liang, Hanqin ^{[1
]}

Xia, Yongfeng ^{[1
]}

Zuo, Kaihui ^{[1
]}

Yin, Jinwei ^{[1
]}

Zeng, Yu-Ping ^{[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, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2021年 / 41卷 / 02期

基金：

国家重点研发计划;

关键词：

Silicon nitride; Silicon; Sintering; Phase transformations; Microstructure; SILICON-NITRIDE; MICROSTRUCTURE;

D O I：

10.1016/j.jeurceramsoc.2020.10.023

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 development of bimodal microstructure in Si3N4 ceramics was crucial to the thermal conductivity and fracture toughness. Silicothermic reduction treatment (SRT) combined with gas-pressure sintering (GPS) were conducted to promote the development of bimodal microstructure. SRT leads to a reduced amount of liquid phase and an increased N/O ratio in the liquid phase, resulting in a faster phase transformation rate relative to densification and a promoted grain growth during GPS. Consequently, large beta-Si3N4 grains were well developed in a porous fine beta-Si3N4 matrix skeleton without grain impingement. Dense Si3N4 ceramics with exaggerated bimodal microstructure was obtained after sintered at 1900 degrees C for 4 h. Summarily, the addition of Si leads to the improvement of thermal conductivity and fracture toughness simultaneously.

引用

页码：1735 / 1738

页数：4

共 15 条

[1] USING MICROSTRUCTURE TO ATTACK THE BRITTLE NATURE OF SILICON-NITRIDE CERAMICS [J].