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A series of samples of hexagonal boron nitride-aluminum nitride ceramic com-posites with different amounts of CaF2 as sintering aid were prepared by spark plasma sintered at 1700-1850 ℃ for 5 min.The addition of CaF2 effectively lowered the sintering temperature and promoted the densification of AlN-BN composites.With the increase of sintering temperature,the density increased,and the contiguity of AlN grains enhanced in AlN-BN composites.Thermal conductivity of AlN-BN composites increased with the increase in CaF2 content and sintering temperature,and there is a maximum value of 78.6 W·m-1·K-1 when the sample with 3wt% CaF2 sintered at 1800 ℃.
A series of samples of hexagonal boron nitride-aluminum nitride ceramic com-posites with different amounts of CaF2 as sintering aid were prepared by spark plasma sintering at 1700-1850 ° C for 5 min. The addition of CaF2 substantially lowered the sintering temperature and promoted the densification of AlN-BN composites. With the increase of sintering temperature, the density increased, and the contiguity of AlN grains enhanced in AlN-BN composites. thermoplastic conductivity of AlN-BN composites increased with the increase in CaF2 content and sintering temperature, and there is a maximum value of 78.6 W · m-1 · K-1 when the sample with 3 wt% CaF2 sintered at 1800 ° C.