摘要
与常用的钢质排气门相比,ＴｉＡｌ基合金排气门的耐高温、抗磨损、抗氧化和导热性等性能更好,而且质量减轻一半。本文采用元素Ｔｉ、Ａｌ粉末混合、冷等静压和径向热压相结合的工艺,制备出高径比为１０．７,密度为３．７９ｇ/ｃｍ３的粉末冶金ＴｉＡｌ基合金汽车发动机排气门,为制备合格的ＴｉＡｌ基合金排气门探索了一条新的途径。同时指出,要大范围应用ＴｉＡｌ基排气门必须降低其成本。
Compared with common steel exhaust valve, TiAl base alloy exhaust valve has hatter high-tempera-ture resistance,better wear resistance,better oxidation resistance and better thermal conductance,and of a half masslighter. One powder metallurgy TiAl base alloy engine exhaust valve for motor vehicle, whose ratio of height to diam-eter is 10.7 and density is 3.79 g/cm3,has been made from mixed powder of Ti and Al with a cold isostaticpressing process in conjunction with a radial hot pressing process. One new method to make qualified TiAl base al-loy exhaust valve has been found. It is indicated at the same time that cost reduction has to be done to apply Ti-Al base alloy exhaust valve widely.
出处
《汽车技术》
北大核心
2002年第1期26-28,共3页
Automobile Technology
