Effect of Hexagonal BN on the Microstructure and Mechanical Properties of Pressureless Sintered Porous Si3N4 Ceramics

被引：1

作者：

Li, Yongfeng ^{[1
]}

Liu, Ping ^{[1
]}

Wang, Xiangdong ^{[2
]}

Jin, Haiyun ^{[3
]}

Qiao, Guanjun ^{[1
]}

机构：

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

[2] Xi An Jiao Tong Univ, Sch Sci, Xian 710049, Peoples R China

[3] Xi An Jiao Tong Univ, Sch Elect Engn, Xian 710049, Peoples R China

来源：

HIGH-PERFORMANCE CERAMICS VI | 2010年 / 434-435卷

基金：

中国国家自然科学基金;

关键词：

Silicon nitride; Hexagonal boron nitride; Pressureless sintering; Mechanical properties; NITRIDE/BORON NITRIDE NANOCOMPOSITES; THERMAL-SHOCK BEHAVIOR; SILICON-NITRIDE; HIGH-STRENGTH; COMPOSITES; MACHINABILITY;

D O I：

10.4028/www.scientific.net/KEM.434-435.697

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 silicon nitride ceramics with various amounts (25, 35, and 45 vol %) of hexagonal boron nitride (h-BN) were fabricated at 1800 degrees C for 2h by the pressureless sintering process. With FESEM and TEM, the effects of h-BN on the microstructure and mechanical properties of Si3N4 ceramics were investigated. Results of the microstructure and mechanical properties of Si3N4/BN composites showed that the growth of the elongated beta-Si3N4 were hindered by h-BN additive, which resulted in the decrease of fracture toughness of Si3N4/BN ceramics with increasing h-BN content. The morphologies of the fracture surfaces by FESEM revealed the fracture mode for Si3N4/BN composites to be intergranular. However, phase analysis by XRD indicated that the effect of h-BN on the alpha- to beta- Si3N4 phase transformation of Si3N4/BN composites was negligible.

引用

页码：697 / +

页数：2

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