Tungsten carbide: A versatile additive to get trace alkaline-earth oxide impurities out of ZrB2 based ceramics

In this work, trace amounts of alkaline-earth oxide impurities (MxOy), M=Mg, Ca and Al, are identified from different graded ZrB2 based ceramics. The reactions in MxOy-WC systems at high temperature are therefore investigated via X-ray diffraction and element analysis, which have been further suppor...

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Bibliographic Details
Published in:Scripta materialia 2018-04, Vol.147, p.40-44
Main Authors: Zou, Ji, Ma, Hai-Bin, D'Angio, Andrea, Zhang, Guo-Jun
Format: Article
Language:English
Subjects:
Alkaline earth
Borides
Ceramics
Surface oxygen impurities
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Summary:In this work, trace amounts of alkaline-earth oxide impurities (MxOy), M=Mg, Ca and Al, are identified from different graded ZrB2 based ceramics. The reactions in MxOy-WC systems at high temperature are therefore investigated via X-ray diffraction and element analysis, which have been further supported by thermodynamic calculations. Since MxOy with low melting point deteriorates the high temperature performance of ceramics, the effective role of WC on strong ZrB2-SiC-WC ceramics is re-considered: apart from the contribution on removing of ZrO2, WC serves as a versatile additive with capacity to remove different oxide impurities from the ceramic body. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2017.12.033