原位碳化硅复合锆莫来石材料的制备及机理研究

Preparation and the Reaction sintering Mechanism of Mullite Zirconia SiC(p) Ceramics

通过反应烧结锆英石、氧化铝和碳黑的混合物制备了原位ＳｉＣ颗粒复合的锆莫来石材料并研究了烧结机理。结果表明：通过反应烧结可制得原位ＳｉＣ颗粒复合的锆莫来石材料；球状或椭球状的ＺｒＯ２晶粒以均匀分布和聚集体两种形式分布于ＳｉＣ、莫来石、氧化铝及玻璃相共同组成的基质中；反应烧结过程中，ＳｉＣ、莫来石的生成反应滞后于锆英石的分解反应；烧结前期以ＳｉＣ的生成反应为主，烧结后期以莫来石的形成及致密化进程为主。

Mullite zirconia ceramics with in situ SiC powder were prepared by Reaction sintering process.The reaction sintering mechanism was studied.The results indicate that mullite zirconia SiC(p) ceramics can be prepared by reaction sintering process.Homogeneously distributed zirconia and zirconia cluster exist in the matrix containing mullite,alumina,SiC and glass phase.The decomposition of zircon carries out firstly compared with the formation of SiC and mullite.The formation of SiC happens predominantly at the initial stage of sintering ,while that of mullite and densification process do at the later stage.