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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 AlN/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 AlN 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.
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 AlN / BN composites in this work. , 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 AlN grains and modify the distribution of grain boundary in AIN / BN composites, a heat treating method was introduced through gas pressure sintering (GPS). This processing was significantly beneficial to enhancing the thermal conductivity of the specimen. thermal conductivity of AIN / BN composites with 5-30 vol% BN reached 60 W / m K after the samples were treated by GPS.