以AIN-Y2O3-La2O3为烧结助剂,在5.5 GPa,1 550℃下对c-BN-β-Si3N4复合材料进行了超高压烧结.借助X射线及扫描电镜对烧结样品进行了分析和观察,探讨了保温时间对产物的组成、形貌及力学性能的影响.结果表明:1)超高压条件下c-BN保持了原有的结构及形貌,发育良好的棒状β-Si3N4晶体均匀分布于烧结体中；α-Si3N4完全转变成β-Si3N4的时间随c-BN含量的增加而延长；烧结体相对密度和弯曲强度均随c-BN含量的增加而降低,硬度则随着c-BN含量的增加而增加,而相对密度的降低在一定程度上抵消了c-BN对硬度提高的贡献.2)c-BN质量分数为50％的复合材料同时具备较高的弯曲强度及硬度,其值分别为830 MPa与29.3 GPa.
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