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《Journal of the Chinese Ceramic Society》 2007-03
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EFFECT OF ALUMINUM NITRIDE POWDER CHARACTERISTICS ON MICROSTRUCTURE AND PROPERTIES OF ALUMINUM NITRIDE-BORON NITRIDE COMPOSITE CERAMICS

QIN Mingli1,DU Xueli1,2,SUN wei1,LI Shuai1,QU Xuanhui1,3(1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083;2.School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300191;3.State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)  
Two different kinds of aluminum nitride(AlN)powders with specific surface areas of 4.26 m2/g and 17.4 m 2/g and oxygen contents of 0.98%(in mass,the same below)and 1.69%were used to prepared aluminum nitride-boron nitride(AlN-15BN,content of BN is 15%in mass)composite ceramics.The effect of AlN powder characteristics on the microstructure and properties of AlN-15BN composites were studied.It was found that the characteristics of AlN powder have a great influence on the densification and properties of AlN-15BN ceramics.The densification temperature of composite ceramics with AlN powders synthesized from the combustion precursor was at 1 500—1 650℃.The AlN-15BN ceramics with relative density 95.6%and Rockwell hardness HR A =72 were obtained after sintering at 1 650℃for 3 h.The density of this composite did not increase with the continual increase of sintering temperature.However,the thermal conductivity was increased with the increasing of sintering temperature and could reach 132.6 W/(m.K)when sintered at 1 850℃,but the hardness was reversed to HR A =64.2.For AlN-15BN ceramics prepared with powders synthesized from the precipitated precursor,the densification temperature was in the range of 1 650—1 800℃.The AlN-15BN ceramics with relative density 86.4%,thermal conductivity 104.2 W/(m.K)and HR A =56.2 was obtained after sintering at 1 850℃for 3 h.
【Fund】: 国家杰出青年科学基金(50025412);; 国家重点基础研究发展规划(G2000067203)资助项目
【CateGory Index】: TQ174.1
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