针对传统陶瓷类增强颗粒与金属基体间性质差异较大而致界面结合问题, 探索具金属性质的Ti颗粒作为增强体制备铝基复合材料的途径。对质量比为Al:Ti=77％:23％混和粉体进行真空热压烧结, 分析了烧结组织演变过程。实验结果表明:通过控制烧结条件, 可获得由Al3Ti、TiAl金属间化合物及Ti构成的增强体, 增强体与基体结合良好。烧结温度升高, 有利于扩散反应速度以及材料性能的提高, 利用真空热压烧结方法制备金属间化合物及Ti复合增强铝基复合材料的合理烧结温度为600℃-630℃。
In an attempt to improve the weak-bonding interface of metallic matrixes and conventional ceramic reinforcing agents, a way to prepare Al-based composites reinforced by using Ti particles was explored. Firstly, Al and Ti powders with nominal mass ratio of 77:23 were mixed fully and heat-sintered under the condition of vacuum and some pressure. Then microstructural evolution of the resultant products during the sintering process was characterized. It shows that a kind of laminated reinforcements composed of intermetallic Al3Ti, TiAl and metallic Ti can be formed under appropriate sintering conditions, and the reinforcements have good bonding with Al matrix. The optimum sintering temperature for preparing such high-performance Al-based composites is from 600℃ to 630℃.
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