本文介绍一种镍钨钙基底,镀铼的氧化物阴极,这种阴极在650～750℃的温度下工作,支取300～500mA/cm~2的电流,寿命相继达到15000～25000小时以上(有些还仍在继续进行)。这种阴极除具有一般氧化物阴极所具有的工艺简单、应用方便的优点外,还具有工作温度低、发射性能好和使用寿命长的特点。我们对一些不同厚度的镀层进行了发射性能与寿命方面的试验,同时对镀层所起的作用做了定性的分析。 This article describes a nickel tungsten calcium substrate, rhenium oxide cathode oxide, the cathode at 650 ~ 750 ℃ ​​temperature work, withdraw 300 ~ 500mA / cm ~ 2 current, life expectancy reached 15000 ~ 25000 hours or more Still going on). In addition to the common oxide cathode has a simple process, the advantages of easy application, but also has low operating temperature, emission performance and long life characteristics. We tested the emission performance and lifetime of some coatings with different thicknesses, and analyzed qualitatively the function of the coatings.