稀土钼合金力学和热发射性能的研究  

A Study on Mechanical and Thermionic Properties of Rare Earth Oxide-Doped Molybdenum

作　　者：张久兴[1] 周美玲[1] 周文元[1] 王金淑[1] 聂祚仁[1] 左铁镛[1] 

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100022

出　　处：《稀有金属》2002年第2期124-128,共5页Chinese Journal of Rare Metals

基　　金：国家 973项目 (G19980 6 1316 );北京市科技新星计划资助项目 ( 95 2 872 2 0 0 )

摘　　要：稀土氧化物 (La2 O3 、Y2 O3 )在强化钼的同时 ,对钼具有显著的韧化作用 ,即具有综合强韧化作用。稀土钼材作为高温结构材料正逐步取代Al Si K掺杂钼 (ASK)和TZM钼合金 ;通过成分设计和加工工艺优化 ,稀土钼还是一种工作温度低、无放射性污染的新型阴极材料 ,由稀土钼作为阴极的电子管 ,发射性能与寿命均达到或超过同类型W ThO2 阴极电子管 ,达到实用化水平。因此 ,稀土钼作为一种集结构与功能于一身的新型材料 。Our recent researches and advances in rare earth doped molybdenum were described systematieally. It is shown that no matter under the condition of room temperature, low temperature or high temperature, the strength and the tougness properties of the rare earth oxide doped molybdenum and its thermionic emission capacity, are greatly improved by the addition of La 2O 3 and Y 2O 3. The rare earth oxides(La 2O 3, Y 2O 3) exhibit a comprenhensive strengthening and toughening effect on molybdenum, which makes the molybdenum toughened with more ductility and lower DBTT while the strength of molybdenum increases. Besides it is proved that rare earth doped molybdenum cathode has better emission property and lower operating temperature than W ThO 2 cathode. Therefore, the rare earth doped molybdenum is widely used as thermionic cathode and high quality structural materials.

关 键 词：稀土钼合金 热发射性能 强韧化 阴极 电子发射 

分 类 号：TG146.412[一般工业技术—材料科学与工程] TG146.45[金属学及工艺—金属材料]