【摘要】 铂中加入双稀土元素后,其高温持久强度及蠕变断裂激活能得到很大提高。1300℃时合金的持久强度断裂时间是纯铂的23～360倍。研究表明,PtYLu合金熔炼过程中形成PtY（Lu）化合物;高温内氧化作用下形成Y₂O₃和Lu₂O₃氧化物;高温长时间作用下形成Pt₂Y（Lu）化合物。大部份稀土富集在晶界上。本文对微号双稀土无素提高Pt高温持久强度的机理讲行了探讨。更多还原

【Abstract】 It has been found that the high-temperature tensile strength and creep activation energy were increased when the binary-rare earth elements had been added into platinum. At 1300℃, the time of failure of the alloys is 23～360 times longer than that of Pt. It was demonstrated that the PtY （Lu） was formed during melting, Y₂O₃ and Lu₂O₃were formed at high-temperature. The Pt₂Y（Lu）was formed at high temperature and heat preservation for a long time. Most of rare earth elements were concentrated on the grain boundary of PtYLu alloy. The mechanism of the effect of rare earth elements on the platinum was discussed.更多还原