Abstract
In this paper, we study the oxidation behaviour of a ZrB2/Al-doped SiC composite at 1500°C. The composite was prepared by hot-pressing the mixture of ZrB2 and polymer-derived SiC(Al). The oxidation behaviour was studied by measuring the weight change as a function of oxidation time and by observing the structure of the oxide layer. It is shown that the ZrB2–SiC(Al) exhibits different oxidation behaviour and improved oxidation resistance as compared to the conventional ZrB2–SiC without Al-doping. The improvement in oxidation resistance is attributed to that Al-doping could increase the bond strength of the Si–O and suppress the active oxidation of SiC.
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