Preparation and properties of Os–Ir–Al alloy for impregnated tungsten cathodes  

作　　者：Yang Xia Yuan-Feng Xie Heng Jiang Hong Lv Yu-Min Wang 

机构地区：[1]Powder Metallurgy and Special Material Research Department,General Research Institute of Nonferrous Metals

出　　处：《Rare Metals》2013年第6期564-568,共5页稀有金属（英文版）

基　　金：supported by the Special Fund Project for Technology Research and Development of Scientific Research Institute (No. 2012EG115001)

摘　　要：Os–Ir–Al alloy was fabricated by powder metallurgy technique.IrAl and OsIr interalloys were synthesized to reduce the Al evaporation and ensure the composition of the ternary alloy.Analysis on microstructures shows that each component is distributed homogeneously,and the green density reaches 94.9%.Ba–W cathodes with Os–Ir–Al alloy magnetic sputtered on the tips are prepared and directly current density tests are carried out on these cathodes.It is found that at 1,050℃,the average zero field emission density of the cathode reaches up to 20 Aácm-2.The improvements of cathodic current density and stability may indicate the prosperous application of Os–Ir–Al alloy on cathode.Os–Ir–Al alloy was fabricated by powder metallurgy technique.IrAl and OsIr interalloys were synthesized to reduce the Al evaporation and ensure the composition of the ternary alloy.Analysis on microstructures shows that each component is distributed homogeneously,and the green density reaches 94.9%.Ba–W cathodes with Os–Ir–Al alloy magnetic sputtered on the tips are prepared and directly current density tests are carried out on these cathodes.It is found that at 1,050℃,the average zero field emission density of the cathode reaches up to 20 Aácm-2.The improvements of cathodic current density and stability may indicate the prosperous application of Os–Ir–Al alloy on cathode.

关 键 词：CATHODE Os–Ir–Al alloy Interalloys HOMOGENEOUS Current density 

分 类 号：TG174.4[金属学及工艺—金属表面处理]