颗粒增强铝基复合材料的差分扫描热分析

In-Situ Synthesis of Particle-Reinforced Aluminum Matrix Composite by Differential Scanning Calorimetry

利用差分扫描分析研究了利用Al-TiO2－B2O3系统制备Al2O3和TiB2颗粒增强金属基复合材料的原位反应过程．用X射线衍射分析了反应过程中的相变．实验结果表明，在较低的扫描速率下，当TiO2和B2O3的克分子比为1时，TiB2和α－A12O3在800℃～9000℃之间形成，而在加热和冷却过程中采用低扫描速率有利于揭示原位反应的细节．加入过量TiO2或B2O3导致了钛或硼的铝化物在冷却过程中的析出．

The in-Situ process of alumina and titanium dioxide particles in aluminum matrix composite, usingAl-TiO2-B2O3 system, has been investigated by means of differential thermal analysis, together with X-raydiffraction analysis. The in-situ reactions in the system were found to lead to the formation of TiB2 andα-Al2O3, between 800℃ and 900℃ when starting with equimolar of TiO2 and B2O3 at lower scan rate. Theslow rate also revealed more detailed information on the in-situ reaction process duing both heating andcooling. During cooling, the precursor containin eithe excessve TiO2 or B2O3 resulted precipitation of corresponding titanium or boron aluminide. The experimental results of X-ray diffraction also evidenced the reactionspresented in the system.