Influence of Aluminates Composition on Ba-W Cathode Characteristics

doi:10.3724/SP.J.1077.2013.13242

Abstract

Abstract: Precursor powder of 612 aluminates (n(BaO):n(CaO):n(Al₂O₃)=6:1:2) was prepared by liquid phase co-precipitation method. In addition, the aluminates were prepared by calcinations of the precursor powder under different atmospheres (H₂, CO₂, N₂) and temperatures (1300℃, 1400℃, 1500℃). The obtained products are characterized 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 systematically investigated. The results show that the crystalline phase of aluminates prepared under H₂ at 1500℃ is Ba₅CaAl₄O₁₂, The Ba-W cathodes impregnated with this kind aluminates have the maximum emission current density (12.2 A/cm²) and the minimum rate of evaporation (1.09×10^-8 g/(cm²?s)).

Key words: aluminates, Ba₅CaAl₄O₁₂, co-precipitation, Ba-W cathode

CLC Number:

TB742

WANG Kai-Feng, LIU Wei, WANG Jin-Shu. Influence of Aluminates Composition on Ba-W Cathode Characteristics[J]. Journal of Inorganic Materials, 2013, 28(12): 1354-1358.

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