以氮化铝(AlN)和氮化硼(BN)为原料,无烧结助剂、热等静压烧结制备了AlN-BN复相陶瓷,研究了热等静压温度和压强对两种不同原料配比(摩尔比)烧结试样的微观结构和性能的影响.结果表明:增加BN的添加量对复相陶瓷的烧结致密化影响较小,但逐渐降低硬度和热导率、增大体积电阻率.相同原料配比下,复相陶瓷的密度越高,其热导率、体积电阻率、硬度越高.热导率和体积电阻率的实测值与两相复合模型方程λcom=λ2(λ1+F)(1-Φ)(λ2-λ1)/λ2-(1+F)(1-Φ)(λ2-λ1)较为符合.当nAlN∶nBN=75∶25时,在温度为1600℃、压强为90 MPa、保温3h的热等静压工艺下可以制备出相对密度达98.03％、热导率为77.29 W/(m·K)、体积电阻率为1.35× 1015Ω·cm的复相陶瓷.
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