Effects of Microstructure Modification on Properties of AlN/BN Composites

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 23; no. 1; pp. 121 - 124
• Main Author: 李美娟 张联盟 SHEN qiang ZHANG Dongming
• Format: Journal Article
• Language: English
• Published: Wuhan Wuhan University of Technology 01.02.2008; Springer Nature B.V
• Subjects: Chemistry and Materials Science; Heat treating; Materials Science; Mechanical properties; Studies; 导热性; 导热系数; 微观结构; 氮化铝/氮化硼复合物; AlN/BN composites; thermal conductivity; microstructure modification
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-006-1121-y

It is very difficult to prepare full-densified aluminum nitride-boron nitride （AIN/BN） composite ceramics with homogeneous microstructure and high thermal conductivity. Spark plasma sintering （SPS） was used to fully densify the AIN/BN composites in this work. Microstructure, mechanical properties and thermal conductivity of the SPS sintered AIN/BN composites with 5-30 vol% BN were investigated. The results show that the microstructure of composites is fine and homogenous, and the AIN/BN composites exhibit high mechanical properties. To promote the growth of AIN grains and modify the distribution of grain boundary in AIN/BN composites, a heat treating methodology was introduced through gas pressure sintering （GPS）. This processing was significantly beneficial to enhancing the thermal conductivity of the specimen. The thermal conductivity of AIN/BN composites with 5-30 vol% BN reached 60 W/m K after the samples were treated by GPS.