The Influence of Ageing Process on the Barium Aluminate Phase Composition

Bezmaternykh, Anna O.; Shvaljov, Y.B.; Kudiiarov, Viktor N.; Губин, В. Е.; Babihina, Maria N.

doi:10.1051/matecconf/20167201012

Cited by 2 publications

(1 citation statement)

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“…To improve the properties of aluminates for Ba-W cathodes, researchers have focused on the effects of the synthesis process [ 8 , 11 , 12 ], the phase composition [ 6 , 13 ], the scandium element doping [ 14 , 15 , 16 ], and porous tungsten matrix [ 17 ] on the properties of aluminates. C. Lai et al [ 14 , 18 , 19 ] proposed the sputtering of a layer of unit or multi-element metal film on the surface of Ba-W cathode to prepare a coated cathode, which can improve its emission performance.…”

Section: Introductionmentioning

confidence: 99%

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

Wei

Feng

et al. 2018

Materials

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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).

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