Oxidation behavior of ZrC-based composites in static laboratory air up to 1300 degree C

Two ZrC-based composites, viz., ZrC+20vol.%SiC and ZrC+20vol.%SiC+20vol.%ZrB2, were prepared by hot pressing. The oxidation behavior of the composites was studied in the temperature range of 800 degree C-1300 degree C in air. From the mass gain tests, the surface and cross-sectional SEM observation...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2014-09, Vol.46, p.159-167
Main Authors: Ma, Baoxia, Han, Wenbo, Guo, Erjun
Format: Article
Language:English
Subjects:
Borosilicate
Cross sections
Gain
Hot pressing
Oxidation
Oxidation resistance
Refractory metals
Silicon carbide
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Summary:Two ZrC-based composites, viz., ZrC+20vol.%SiC and ZrC+20vol.%SiC+20vol.%ZrB2, were prepared by hot pressing. The oxidation behavior of the composites was studied in the temperature range of 800 degree C-1300 degree C in air. From the mass gain tests, the surface and cross-sectional SEM observation and EDS analysis of the oxidized samples, it was found that the ZrC+20vol.%SiC composite seemed to have a high oxidation resistance below 1000 degree C, but the ZrC+20vol.%SiC+20vol.%ZrB2 composite appeared a more excellent oxidation resistance up to 1200 degree C. It is main reason that the oxidation rate of ZrC is higher than that of SiC below 1300 degree C, meaning that SiO2 from SiC is insufficient to form a dense tight protection film; however, the addition of ZrB2 particles promotes the formation of more borosilicate above 1000 degree C, which exerts more protective effect by self-healing mechanism.
ISSN:0263-4368
DOI:10.1016/j.ijrmhm.2014.05.013