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Study on Morphology and Chemical States of Surface Active Layer of Th-W Cathode
Cheng, Yin1,2; Sun, Yuan1; Zhou, Yizhou1; Wang, Shiyang1; Meng, Jie1; Cao, Nan3; Shi, Wanpeng4
Corresponding AuthorSun, Yuan(yuansun@imr.ac.cn) ; Zhou, Yizhou(yzzhou@imr.ac.cn)
2022-04-01
Source PublicationMATERIALS
Volume15Issue:8Pages:11
AbstractThe surface morphology and chemical states of W-2%ThO2 thermionic cathode during vacuum high-temperature treatment were investigated in this research. The W-2%ThO2 thermionic cathode was prepared by a solid-liquid doping method combined with high-temperature sintering. The morphology and distribution of thorium oxide were observed using a transmission electron microscope and scanning electron microscope. The chemical states of elements at different temperatures were analyzed by X-ray photoelectron spectroscopy. Results indicate that the surface morphology and chemical form of the alloy evolve with the increase of temperature. The matrix had a lamellar structure at low temperatures, and the surface was relatively flat. The samples were heated to 500 degrees C, 1100 degrees C, and 1300 degrees C for 1 h. During the heating process, thorium oxide changed from granular to spherical, and the matrix was recrystallized. As the heating temperature rises, diffusion channels appear inside the cathode. As the temperature increases, the high-priced tungsten gradually decreases, and the zero-valent tungsten content increases. The adsorbed oxygen left the cathode surface, and the lattice oxygen increased. The surface oxygen content decreased, and the thorium and tungsten content increased.
Keywordthorium organization surface active layer chemical states
Funding OrganizationNational Natural Science Foundation of China ; National Science and Technology Major Project ; Technology Foundation of China ; Industrialization Innovation Team of the Industrial Technology Research Institute of the Chinese Academy of Sciences in Foshan
DOI10.3390/ma15082726
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51801206] ; National Science and Technology Major Project[J2019-VI-0018-0133] ; Technology Foundation of China ; Industrialization Innovation Team of the Industrial Technology Research Institute of the Chinese Academy of Sciences in Foshan[ZK-TD-2019-04] ; [2021JH15]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000786151800001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/172690
Collection中国科学院金属研究所
Corresponding AuthorSun, Yuan; Zhou, Yizhou
Affiliation1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Liaoning Zhongke Boyan Technol Co, Shenyang 113122, Peoples R China
4.Foshan Huizhen Technol Co, Foshan 528251, Peoples R China
Recommended Citation
GB/T 7714
Cheng, Yin,Sun, Yuan,Zhou, Yizhou,et al. Study on Morphology and Chemical States of Surface Active Layer of Th-W Cathode[J]. MATERIALS,2022,15(8):11.
APA Cheng, Yin.,Sun, Yuan.,Zhou, Yizhou.,Wang, Shiyang.,Meng, Jie.,...&Shi, Wanpeng.(2022).Study on Morphology and Chemical States of Surface Active Layer of Th-W Cathode.MATERIALS,15(8),11.
MLA Cheng, Yin,et al."Study on Morphology and Chemical States of Surface Active Layer of Th-W Cathode".MATERIALS 15.8(2022):11.
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