YB2C2 : A new additive for fabricating Si3N4 ceramics with superior mechanical properties and medium thermal conductivity

被引：21

作者：

Liang, Hanqin ^{[1
]}

Wang, Weide ^{[1
,2
]}

Zuo, Kaihui ^{[1
]}

Xia, Yongfeng ^{[1
]}

Yao, Dongxu ^{[1
]}

Yin, Jinwei ^{[1
]}

Zeng, Yuping ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 201899, Peoples R China

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

来源：

CERAMICS INTERNATIONAL | 2020年 / 46卷 / 04期

基金：

国家重点研发计划;

关键词：

Si3N4; Thermal conductivity; YB2C2; Flexural strength; SILICON-NITRIDE; FRACTURE-TOUGHNESS; SI POWDER; MICROSTRUCTURE;

D O I：

10.1016/j.ceramint.2019.10.272

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：

Si3N4 ceramics were hot-pressed with MgO and self-synthesized YB2C2 as sintering additives at 1800 degrees C for 2 h under the pressure of 60 MPa. The addition of YB2C2 played a significant role in the simultaneous achievement of superior mechanical properties and medium thermal conductivity of Si3N4 ceramics. Due to the existence of multilayer YB2C2 nanoplatelets, the flexural strength and fracture toughness of Si3N4 ceramics reached up to 1189.6 +/- 43.7 MPa and 9.46 +/- 0.14 MPa m(1/2), respectively. Owing to the reaction between YB2C2 and native SiO2 on the surface of Si3N4 powders, the lattice oxygen was removed and the thermal conductivity of Si3N4 ceramics was about 77.0 W/(m.K).

引用

页码：5239 / 5243

页数：5

共 25 条

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