粉末冶金TiAl合金排气门的研制  

Development of powder metallurgy TiAl-based alloy automotive exhaust valve

作　　者：欧阳鸿武[1] 刘咏[1] 贺跃辉[1] 黄伯云[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2002年第2期334-337,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家"八六三"计划资助项目 (715 -0 0 5 -0 0 40 )

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/cm3In 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 3.79?g/cm 3, which has proven the feasibility of radial hot pressing experimentally.

关 键 词：粉末冶金 TIAL基合金 排气门 研制 汽车 发动机 

分 类 号：U464.134.3[机械工程—车辆工程] TF125.22[交通运输工程—载运工具运用工程]