(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 利用元素粉末冶金方法制备了TiAl合金排气阀。为提高排气门杆部的致密度、均匀度，设计了特有的径向热压工艺，并从理论上分析了与该工艺相关的压坯密度、致密化和应力变化规律。制备出高径比为10.7，密度为3.79g/cm3的粉末冶金TiAl合金汽车发动机排气门。
关键字: 粉末冶金；TiAl基合金；排气门
TiAl-based alloy automotive
exhaust valve
（State Key Laboratory for Powder Metallurgy，
Central South University， Changsha 410083，China）
Abstract:In order to manufacture TiAl-based alloy automotive exhaust valve，a new powder densification and near net shaping technique (named as radial hot pressing) was suggested. The density of the powder compact，the densification equation and stress equation for radial hot pressing have been determined theoretically. By this technique，TiAl-based alloy automotive valve with large height-to-diameter ratio of 10.7 has been obtained，and its density up to 3.79g/cm3，which has proven the feasibility of radial hot pressing experimentally.
Key words: powder metallurgy; TiAl-based alloy; valve
