Effect of initial phase composition on the phase composition, microstructure, and mechanical properties of Si3N4 ceramics

被引：3

作者：

Du, Songmo ^{[1
]}

Zhang, Jie ^{[1
]}

Li, Fei ^{[1
]}

Chen, Zhanglin ^{[1
]}

Zhang, Shijia ^{[1
]}

Zhao, Shuo ^{[1
]}

Cui, Wei ^{[1
,2
]}

Chen, Kexin ^{[1
]}

Liu, Guanghua ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[2] Foshan Southern China Inst New Mat, Foshan, Guangdong, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2024年 / 107卷 / 04期

基金：

中国国家自然科学基金;

关键词：

microstructure evolution; phase transition; silicon nitride; sintering; SPS; SILICON-NITRIDE CERAMICS; GRAIN-GROWTH; TRANSFORMATION; SIMULATION; EVOLUTION; STRATEGY;

D O I：

10.1111/jace.19584

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：

Silicon nitride (Si3N4) ceramics with initial beta-Si3N4 content from 3% to 88% were prepared by spark plasma sintering from 1450 to 1700 degrees C. The effect of initial beta-Si3N4 content on the phase transition, microstructure evolution, and mechanical properties of the Si3N4 ceramics was studied. The existence of initial beta-Si3N4 accelerated the alpha-beta phase transition. When the initial beta-Si3N4 content was 12% and 46%, the aspect ratio of the grains was increased. When the initial beta-Si3N4 content was 88%, the grains were mainly composed of short rod-like grains. As the initial beta-Si3N4 content increased, the densification process was slowed down. The hardness and fracture toughness of samples reached about 18 GPa and 6 MPa<middle dot>m(1/2). It is proposed that the mechanical properties of samples are connected with the densification process and beta-Si3N4 content.

引用

页码：2556 / 2564

页数：9

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