【摘要】 采用反应烧结方法，利用ＴｉＯ２，Ａｌ和Ｂ粉末间的放热反应在较低的温度下制备Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷和原位生长Ａｌ２Ｏ３和ＴｉＢ２弥散粒子增强Ａｌ复合材料Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷是密度ρ～０．８的多孔体，由尺寸约１０μｍ的生长单元构成晶粒，在陶瓷中还含有少量的Ａｌ３Ｔｉ．Ａｌ基复合材料中原位形成的Ａｌ２Ｏ３和ＴｉＢ２粒子尺寸小于２μｍ，在基体中呈现均匀分布，没有发现Ａｌ３Ｔｉ生成．这种原位Ａｌ基复合材料具有优于ＳｉＣｗ／Ａｌ复合材料的强度．更多还原

【Abstract】 Utilizing the exothermic reaction between TiO2, Al and B powders, the Al2O3-TiB2 composite ceramics and the in-situ formed A12O3 and TiB2 particulates reinforced Al composite were fabricated at lower temperature by reaction sinter method. Al2O3-TiB2 is porous ceramics with 80% of theoretical density, and its grain is consisted of growth units with a size of about 10μm. There was small amount of Al3Ti in the ceramics. The in-situ formed Al2O3 and TiB2 particulates with a size of less than 2μm are uniformly distributed in aluminum matrix, no Al3Ti was found in the composite. The in-situ composite exhibits a strength which is superior to that of SiCw/ Al composite.更多还原