Influence of grain size on the thermal conductivity of tin oxide ceramics

被引:81
作者
Fayette, S
Smith, DS
Smith, A
Martin, C
机构
[1] Ecole Natl Super Ceram Ind, Grp Etud Mat Heterogenes, F-87065 Limoges, France
[2] Fac Sci, F-87060 Limoges, France
关键词
tin oxide; thermal conductivity; microstructure-final; grain size; SnO2;
D O I
10.1016/S0955-2219(99)00171-5
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
Measurement of the thermal diffusivity by the laser flash technique has been used to evaluate thermal conductivity values between 20 degrees C and 900 degrees C for tin oxide ceramics. By using MnO2 as a sintering additive, strong variation of the microstructure in terms of porosity and average grain size was achieved in the samples. For dense ceramics, larger average grain size yielded a significant increase in the room temperature thermal conductivity. This could be attributed to a reduction of the number of grain boundaries in the heat flow path. The grain boundary interfacial resistance was consequently estimated at 4.1x10(-8) m(2) KW-1. Data concerning the effects of additive amount, pore content, and temperature are also reported. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:297 / 302
页数:6
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