摘要
本文开展了活性物质为钨酸钡锶的浸渍式钨酸盐钡钨阴极的研究,主要包括钨酸钡锶盐的合成,浸渍式钨酸钡锶阴极的制备及其发射性能的测试。实验结果表明:在1400℃空气气氛中合成了主要相为Ba_3WO_6及Ba_2SrWO_6的钨酸钡锶盐。在1800℃浸渍该钨酸盐与氢化锆的混合物成功制备了浸渍式钨酸盐阴极,阴极发射性能测试结果表明在1050℃_(br)和1000℃_(br)时直流发射电流密度分别为7.54和4.30 A/cm^2。
A novel type of the impregnated tungsten cathode activated by Ba-Sr tungstate was fabricated.The influence of the fabrication conditions,including but not limited tothe synthesis temperature of Ba-Sr tungstate,impregnation temperature of a mixture of tungstate and zirconium hydride,and porosity of tungsten base,on the emission characteristics of the cathode was investigated with X-ray diffraction,scanning electron microscopy,and energy dispersive spectroscopy.The results show that the fairly uniform stable DC emission current density of the cathode reaches 7.54 A/cm^2 at1050℃_（br） and 4.30 A/cm^2 at 1000℃_（br）,respectively,impregnated at 1800℃ with Ba-Sr tungstate sintered at 1400℃ in air and existing mainly in the phases of Ba_3WO_6 and Ba_2SrWO_6.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2016年第1期28-32,共5页
Chinese Journal of Vacuum Science and Technology
关键词
钨酸盐阴极
钨酸钡锶
X射线衍射分析
发射电流密度
Tungstate cathode
Barium-strontium tungstate
XRD analysis
Emission current density
