锆莫来石-碳化硅材料反应烧结过程的研究

Research on the reaction-sintering process of zirconia-mullite composite with in-situ SiC(p)

研究了用锆英石、氧化铝和炭黑的混合物制备原位SiC颗料复合锆莫来石材料的反应烧结进程和显微结构特征。结果表明：反应烧过程中，SiC、莫来石的生成反应滞后于锆莫来石的分解反应；反应前期，SiC的生成占主导作用。反应后期，莫来石的形成及致密化进程占主导作用；材料中存在大量气孔，ZrO3以均匀分布和聚集体两种形式分布于莫来石、SiC及玻璃相构成的基质中。

The reaction -sintering mechanism and microstructure of zirconia-mullite ceramics with in situ SiC powder were investigated. The results indicate that decomposition of zircon occurs firstly before the formation of SiC and mullite.The formation of SiC happens predominantly at the initial stage of sintering, while tbe formation of mullite and densification process takes place at the later stage. A lot of pores are observed in the samples. The homogeneous distributed zirconia and zirconia agglomerates are found in the matrix formed by mullite, SiC and glassy phase.