Zirconium diboride (ZrB2) ceramic matrix composites reinforced by silicon carbide platelets (SiCpl) were prepared by hot pressing. Five groups of specimens were prepared, in which the contents of SiC platelets were 0, 5, 10, 15 and 20 vol%, respectively. The oxidation behaviors of specimens at different temperatures from 800° to 1600°C for 1 h and at 1200°C for different times from 0.5 to 4 h were investigated. With the increase of SiCpl content, the mass gain exhibited a decreasing trend. Oxidation thermodynamics and kinetics of the SiCpl/ZrB2 composites were discussed. A characteristic structure of hollow quadrangular prismy ZrO2 crystal emerged on the sample surface after oxidation was found and the possible formation mechanism was also presented. The surface element analysis indicated that the main products of oxidation were m-ZrO2, SiO2, and borosilicate (aluminosilicate).
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