Effect of BaO on the phase composition and properties of aluminates for Ba-W cathodes

Li, Jinglin; Zhao, Wei; Wei, Jingxuan; Feng, Yongbao; Li, Xiaoyun; Qiu, Tai

doi:10.1016/j.ceramint.2018.11.105

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…5 The barium calcium aluminates for impregnated cathodes can be classified into the types 411, 612, 532, and 512 according to their chemical compositions. [6][7][8][9] The digits represent the molar ratio of the oxides in the materials. For example, in a 411-aluminate, the molar ratio of barium oxide, calcium oxide, and alumina is 4:1:1.…”

Section: Introductionmentioning

confidence: 99%

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Phase selectivity and environmental stability of 612‐aluminate synthesized by sintering Co‐precipitated precursor

Dong,

Zhou,

Gong

et al. 2023

Int J Applied Ceramic Tech

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The environmental stability of barium calcium aluminate for impregnated cathodes is significant for storing impregnants and fabricating thermionic cathodes. In this work, two types of phase structures are obtained in the 612‐type aluminate. The Ba3CaAl2O7 single‐phase structure is obtained if the crucible is uncovered after sintering for 300 min at 1200°C. In contrast, the Ba3Al2O6 and BaCO3 dual‐phase structure is achieved by suppressing the solid‐state reaction by covering the crucible and reducing the sintering duration to 75 min. The dual‐phase sample exhibits superior environment stability to the single‐phase one when exposed to moist air. The reason could be attributed to the smaller specific surface area and total pore volume of the dual‐phase sample due to the incomplete liberty of gases in sintering. Because of their identical compositions, the cathodes impregnated with different sintered phases possess comparable electron emission capacities. This work provides an effective process to synthesize 612‐aluminate with good environmental stability and emissive capacity.

show abstract

Section: Introductionmentioning

confidence: 99%

“…The barium calcium aluminates for impregnated cathodes can be classified into the types 411, 612, 532, and 512 according to their chemical compositions 6–9 . The digits represent the molar ratio of the oxides in the materials.…”

Section: Introductionmentioning

confidence: 99%

Phase selectivity and environmental stability of 612‐aluminate synthesized by sintering Co‐precipitated precursor

Dong,

Zhou,

Gong

et al. 2023

Int J Applied Ceramic Tech

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Cathodes in magnetrons: A review

Liu,

Yang,

Sun

et al. 2024

MetalMat

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Magnetron is currently one kind of the most widely used vacuum electronic devices. The cathode, as the electronic source of the device, is the core of magnetrons. With the development of magnetrons, the requirements for cathode performance are also increasing, including thermal electron emission and secondary electron emission performance. This article reviews the development history of cathodes used in magnetrons, discusses the performance and application fields of various cathodes, and the relationship between performance and structure. However, there are still certain problems with various cathode materials that make it difficult to truly cover all magnetrons. The ongoing challenges relating to the magnetron cathodes have been discussed in this paper.

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Experimental and first-principles investigations on W-Ir mixed matrices cathodes with improved emission performance

Gao

Chu

Wang

et al. 2022

Applied Surface Science

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Effect of BaO on the phase composition and properties of aluminates for Ba-W cathodes

Cited by 7 publications

References 17 publications

Phase selectivity and environmental stability of 612‐aluminate synthesized by sintering Co‐precipitated precursor

Phase selectivity and environmental stability of 612‐aluminate synthesized by sintering Co‐precipitated precursor

Cathodes in magnetrons: A review

Experimental and first-principles investigations on W-Ir mixed matrices cathodes with improved emission performance

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