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Factors affecting the phase composition of 612 aluminates for Ba–W cathode

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Abstract

The precursor powder of 612 aluminates were synthesized by using liquid-phase co-precipitation method. The microstructure and formation mechanisms of the precursor powder were investigated through X-ray diffraction, thermal gravimetric, differential scanning calorimetry, and scanning electron microscope. The effects of the stacking states of the precursor powder, calcination temperature, and atmosphere on the phase compositions of 612 aluminates were also systematically studied. Results showed that the prepared precursor powder was a mixture of BaCO3, BaCa(CO3)2, and amorphous AlOOH, which with particle size ranging from 20 to 30 nm. The stacking states of the precursor powder considerably influenced the phase composition of aluminates. The pressed precursor tablet can ensure the final phase composition of aluminates was Ba3CaAl2O7. When the precursor powder was calcined in CO2 atmosphere at 1400 °C for 2 h, the phase composition included Ba5CaAl4O12, BaAl2O4, and BaCO3. When the calcination temperature was increased, the main crystalline phase of aluminates changed from Ba5CaAl4O12 to Ba3CaAl2O7 in flowing N2, Ar, and static air. The barium–tungsten cathode prepared by aluminates of Ba3CaAl2O7 phase showed better emissivity than that of Ba5CaAl4O12 phase. The current density of pulse emission at 1050 °C can reach 35.31 A/cm2.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, 210009, China

    Jianjun Wei, Jinglin Li, Yongbao Feng, Xiaoyun Li, Saisai Xu & Tai Qiu

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  1. Jianjun Wei
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  2. Jinglin Li
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  3. Yongbao Feng
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Correspondence to Yongbao Feng.

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Wei, J., Li, J., Feng, Y. et al. Factors affecting the phase composition of 612 aluminates for Ba–W cathode. J Mater Sci: Mater Electron 29, 16330–16337 (2018). https://doi.org/10.1007/s10854-018-9723-7

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