Si₃N₄-MoSi₂复合陶瓷导电性能研究  

Study on the Conductive Property of Si_3N_4-MoSi_2 Composite Ceramics

作　　者：谭威[1] 林旭平[1] 马景陶[1] 张宝清[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室

出　　处：《稀有金属材料与工程》2011年第S1期196-198,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重大研究计划资助(90916025)

摘　　要：研究不同MoSi2含量对Si3N4-MoSi2复合陶瓷导电性能的影响,并对导电机制进行分析。Si3N4-MoSi2复合陶瓷的电阻率随着MoSi2含量增加而降低,呈"S"型曲线。当MoSi2含量为30%~35%(体积分数,下同)时,电阻率由1010Ω·cm骤降至10-3Ω·cm。MoSi2作为导电相在复合陶瓷中起导电通道作用,当其含量超过30%时,导电相形成连通网络结构,使复合陶瓷电阻率迅速下降。复合陶瓷中有新相Mo5Si3生成,Mo5Si3相同样起导电相作用。The effect of different content of MoSi2 on the conductive property of Si3N4-MoSi2 composites was investigated, and its conductive mechanism was also studied. The resistivity is decreased when the content of MoSi2 is increased, and its relation curve performs like 'S'. The resistivity changes from 1010 to 10-3 Ω·cm when the content of MoSi2 is 30vol%~35vol%. The conductive phase MoSi2 in the composites forms conducting network structure when the content of MoSi2 is more than 30vol%, resulting in decreased resistivity. Proper quanlity of Mo5Si3 appear in composites, which work as a conductive phase, too.

关 键 词：二硅化钼 氮化硅 导电陶瓷 

分 类 号：TQ174.1[化学工程—陶瓷工业]