【摘要】 介绍了α－Ａｌ２Ｏ３， ＴｉＢ２增强自生铝基复合材料 ＸＤ合成工艺，分析了合成反应的热力学及动力学机理．在 Ａｌ－ＴｉＯ２系中未加 Ｂ粉时，生成的增强相是 Ａｌ３Ｔｉ和α－Ａｌ２Ｏ３，通过 Ｂ粉的加入，使 Ａｌ－ＴｉＯ２－Ｂ系中棒状物 Ａｌ３Ｔｉ随 Ｂ／ＴｉＯ２摩尔比的增加而逐渐减少，在 Ｂ／ＴｉＯ２的摩尔比为 ２时，棒状物基本消失．同时分析了升温速率、 Ｂ／ＴｉＯ２摩尔比对燃烧温度、体收缩率的影响．更多还原

【Abstract】 In situ Al-based composites reinforced by α-Al2O3 and TiB2 particles were fabricated by means of exothermic dispersion reaction processing method. The thermodynamic and kinetic mechanisms of reactions have been analyzed. In Al-TiO2 system Al3Ti and α-Al2O3 form and in Al-TiO2-B system Al3Ti, α-Al2O3 and TiB2 form. Al3Ti phase was eliminated completely when the mole ratio of B/TiO2 is about equal to 2. The effects of heating rate and mole ratio of B/TiO2 on combustion temperature and bulk shrinkage were discussed as well.更多还原