Thermal conductivity of AlN ceramics sintered with CaF2 and YF3

被引：61

作者：

Qiao, L ^{[1
]}

Zhou, HP

Fu, RL

机构：

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

[2] China Univ Min & Technol, Coll Mech Elect & Mat Engn, Xuzhou 221008, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2003年 / 29卷 / 08期

关键词：

sintering; microstructure-final; thermal conductivity; aluminum nitride;

D O I：

10.1016/S0272-8842(03)00033-6

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：

Dense AlN ceramics with a thermal conductivity of 180W/m(.)K were obtained at the sintering temperature of 1750 degreesC using CaF2 and YF3 as additives. At temperatures below 1650 degreesC, the shrinkage of AlN ceramics is promoted by liquid (Ca,Y)F-2 and Ca12Al14O32F2. Liquid CaYAlO4 mainly improves the densification of the sample when the sintering temperature increases to 1750 degreesC. The formation of liquid (Ca,Y)F-2 at a relatively low temperature results in homogeneous YF3 distribution around the AlN particles, which benefits the removal of oxygen impurity in the AlN lattice, and thus a higher thermal conductivity. (C) 2003 Elsevier Ltd and Techna S.r.l. All rights reserved.

引用

页码：893 / 896

页数：4