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Open AccessArticle

Effect of CaO on Phase Composition and Properties of Aluminates for Barium Tungsten Cathode

by Jinglin Li 1,2, Jianjun Wei 1,2, Yongbao Feng 1,2,* and Xiaoyun Li 1,2
1
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
2
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1380; https://doi.org/10.3390/ma11081380
Received: 5 June 2018 / Revised: 3 August 2018 / Accepted: 5 August 2018 / Published: 8 August 2018
6BaO·xCaO·2Al2O3 (x = 0.8, 1.2, 1.6, 2, and 2.2) aluminates were synthesized via a liquid phase co-precipitation method. Effects of the molar amount of CaO on the phase of aluminates before and after melting and their hygroscopic phase, melting properties, environmental stability, evaporation, and emission properties were systematically studied. The results show that with the increase of the molar amount of CaO, the aluminates change from a mixture phase to a single phase of Ba3CaAl2O7, and the diffraction peak shifts to a higher angle. The melted phase of the aluminates changed from a single phase to a mixed phase of Ba5CaAl4O12 and Ba3CaAl2O7. Meanwhile, the comprehensive properties of the aluminates are improved. The weight gain of 6BaO·2CaO·2Al2O3 aluminates is only 10.88% after exposure to air for 48 h; the pulse emission current density of barium tungsten cathodes impregnated with 6BaO·2CaO·2Al2O3 aluminates in the porous tungsten matrix can reach 28.60 A/cm2 at 1050 °C, and the evaporation rate is 2.52 × 10−10 g/(cm2·s). View Full-Text
Keywords: aluminates; molar amount of CaO; phase composition; emission current; evaporation rate aluminates; molar amount of CaO; phase composition; emission current; evaporation rate
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Li, J.; Wei, J.; Feng, Y.; Li, X. Effect of CaO on Phase Composition and Properties of Aluminates for Barium Tungsten Cathode. Materials 2018, 11, 1380.

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