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High-temperature oxidation behavior of Co-doped WB2 ceramics in air
Ma, Ke1; Cao, Xiaozhou2; Xue, Xiangxin2; Xu, Jingjun1; Zuo, Jun1; Li, Meishuan1
Corresponding AuthorXue, Xiangxin(xuexx@mail.neu.edu.cn)
2021-09-01
Source PublicationINTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
ISSN0263-4368
Volume99Pages:10
AbstractWith the high melting point, excellent mechanical properties and good thermal stability, WB2 is a candidate of the promising high-temperature structural materials. WB2 ceramics were hot pressed at low temperatures (similar to 1500 degrees C) with a small amount of Co as sintering aids, achieving high relative density and mechanical properties. In this paper, Co-doped WB2 ceramics were selected as test materials to carry out the oxidation experiments systematically. The oxidation resistance of the samples was evaluated at temperatures of 800 degrees C, 1200 degrees C, and 1600 degrees C in static air. At 1200 degrees C and below, Co-doped WB2 ceramics still possessed good oxidation resistance. The oxidation behaviors of the Co-doped WB2 ceramics were studied and the oxidation mechanism was discussed in detail. Besides, the oxidation kinetics of the Co-doped WB2 ceramics at 1200 degrees C were studied. The result showed the oxidation rate of WB2 ceramics basically obeyed a parabolic law at 1200 degrees C. The existence of Co aids was not good for the oxidation resistance of WB2 ceramics, mainly due to the increasing oxygen vacancy concentration of the oxide scale. The phase compositions, the microstructure of the surface and cross section of the oxidized samples were characterized using X-ray diffraction and scan electron microscopy along with energy dispersive spectrometry. Beneath the surface, the oxide scale of Co-doped WB2 ceramics consisted of mainly WO3 skeleton layer and glassy B2O3 layer, which contributed to the good oxidation resistance at 1200 degrees C.
KeywordCo-doped WB2 ceramics Oxidation behavior Kinetics Oxide scale Microstructure
Funding OrganizationNational Natural Science Foundation of China
DOI10.1016/j.ijrmhm.2021.105603
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51472048] ; National Natural Science Foundation of China[52071318]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000674610200006
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159581
Collection中国科学院金属研究所
Corresponding AuthorXue, Xiangxin
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Northeastern Univ, Sch Met, Dept Resource & Environm, Shenyang 110819, Peoples R China
Recommended Citation
GB/T 7714
Ma, Ke,Cao, Xiaozhou,Xue, Xiangxin,et al. High-temperature oxidation behavior of Co-doped WB2 ceramics in air[J]. INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS,2021,99:10.
APA Ma, Ke,Cao, Xiaozhou,Xue, Xiangxin,Xu, Jingjun,Zuo, Jun,&Li, Meishuan.(2021).High-temperature oxidation behavior of Co-doped WB2 ceramics in air.INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS,99,10.
MLA Ma, Ke,et al."High-temperature oxidation behavior of Co-doped WB2 ceramics in air".INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 99(2021):10.
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