大功率等离子体炬钨铈阴极的研究(英文)  

Research on W-Ce Cathodes in High Power Plasma Torches

作　　者：夏维东[1] 万树德[1] 王念春 杨维宏[1] 王文浩[1] 汪海[1] 王从容[1] 赵良骥 袁家涛 

机构地区：[1]中国科学技术大学近代物理系

出　　处：《中国科学技术大学学报》1997年第4期395-398,共4页JUSTC

摘　　要：钨铈阴极用于大功率等离子体炬尚未见报道。这里报道的钨铈阴极为烧结块状结构，含ＣｅＯ２１％～４％，密度１６．５～１７．８ｇ／ｃｍ３，直径２０～３０ｍｍ，长度５～２５ｍｍ，在５０００Ａ电流下经受了３０～６０小时的试验运行考验。阴极温度分布的数值模拟表明：熔化区（温度高于３４１０℃）形状呈半椭圆形。用钢液溅射阴极表面，去除阴极表面熔化区液体。TunsgtenCerium (W-Ce) cathode used for great power plasma torches has not been seen reported previously. The block cathodes of agglomerating tungsten with 1-4% CeO_2, with diameters ranging between 20-30mm, lengths 5-25mm, densities 16.5-17.8g/cm3, are kept in operation for mroe than 50 hours under 5000A current. The numerical simulation on cathodes′ temperature distribution shows that the melting area where the temperature is above 3410℃ (the melting point of tungsten) is semioval. The melting hollows exposed after the tungsten is splashed down are a little greater that those of the numerical simulation. 

关 键 词：等离子体炬 热阴极 钨铈阴极 

分 类 号：O462.1[理学—电子物理学] O53[理学—物理]