压制压力对放电灯用阴极钨骨架孔隙结构和性能的影响  

Effects of pressing pressure on the pore structure and performance of tungsten cathode skeleton for discharge lamps

作　　者：张育宁 王德志[1] 吴壮志[1] 刘新利 段柏华[1] ZHANG Yuning;WANG Dezhi;WU Zhuangzhi;LIU Xinli;DUAN Bohua(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2023年第4期361-367,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点研发计划资助项目(2017YFB0305601);国家自然科学基金项目(51874368)。

摘　　要：孔隙结构均匀的钨骨架是制备高性能电子阴极及放电灯的关键材料。本文系统研究了压制压力对钨骨架孔隙结构、力学性能及放电灯性能的影响。结果表明,随压制压力增大,钨骨架的孔隙率和平均孔径减小,显微硬度及抗压强度提高,孔隙分布均匀性指数先增大后减小。压制压力为500 MPa时,钨骨架的孔隙结构和力学性能最佳,孔隙率为26.29%,平均孔径为1.24μm,孔隙分布均匀性指数为4.17,显微硬度为1506 MPa,抗压强度为810 MPa。该钨骨架作为阴极基体制备的氙气灯在连续闪烁50万次的情况下没有出现漏闪,阴极发射性能稳定,且未达到寿命极限,与现有阴极相比寿命显著提升。Tungsten skeleton with uniformly distributed pores is the key material for producing high-performance electronic cathodes and discharge lamps.This study systematically investigated the effects of pressing pressure on the pore structure,mechanical properties of the tungsten skeleton and the performance of discharge lamp.The results show that with the increase of pressing pressure,the porosity and average pore size of the tungsten skeleton decrease,the microhardness and compressive strength increase,and the uniformity index of pore distribution first increases and then decreases.When the pressing presure is 500 MPa,the pore structure and mechanical properties of the tungsten skeleton are the best,the porosity is 26.29%,the average pore size is 1.24μm,the uniformity index of pore distribution is 4.17,the microhardness is 1506 MPa,and the compressive strength is 810 MPa.The xenon lamp prepared by the tungsten skeleton as the cathode substrate do not show any flashovers after continuous flashing for 500000 times,and its cathode emission performance is stable,and the tungsten cathode has not reach its lifespan limit yet,which shows a significant improvement in lifespan compared to existing cathodes.

关 键 词：放电灯 钨骨架 电子阴极 孔隙结构 力学性能 

分 类 号：TM923.32[电气工程—电力电子与电力传动]