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机构地区:[1]北京工业大学教育部新型功能材料重点实验室,北京100124
出 处:《无机材料学报》2013年第12期1354-1358,共5页Journal of Inorganic Materials
基 金:国家自然科学基金(51225402;51071005)~~
摘 要:采用液相共沉淀法制备了612铝酸盐(n(BaO):n(CaO):n(Al2O3)=6:1:2)前驱粉末,在不同气氛(H2、CO2、N2)、不同温度(1300℃、1400℃、1500℃)焙烧制备铝酸盐,系统研究了不同工艺制备的铝酸盐对钡钨阴极性能的影响。结果表明:前驱粉末的最佳焙烧工艺为:H2气氛、1500℃,可获得主相为Ba5CaAl4O12的铝酸盐,用其制备的钡钨阴极发射电流密度可达12.2 A/cm2,蒸发速率仅为1.09×10-8g/(cm2 s)。Precursor powder of 612 aluminates (n(BaO):n(CaO):n(A120))=6:1:2) was prepared by liquid phase co-precipitation method. In addition, the aluminates were prepared by calcinations of the precursor powder under dif- ferent atmospheres (H〉 CO2, N2) and temperatures (1300~C, 1400~C, 1500~C). The obtained products are character- ized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), TG-DTA and so on. Then effects of different aluminates on the emission properties of Ba-W cathode were systemati- cally investigated. The results show that the crystalline phase of aluminates prepared under H2 at 1500~C is BasCaA14012, The Ba-W cathodes impregnated with this kind aluminates have the maximum emission current density (12.2 A/cm:) and the minimum rate of evaporation (1.09 ~ 10-8 g/(cmLs)).
关 键 词:铝酸盐 Ba5CaAl4O12 共沉淀法 钡钨阴极
分 类 号:TB742[一般工业技术—材料科学与工程]
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