Abstract
In this research, SiC coating was applied by pack cementation method at 1600°C to protect graphite and three-dimensional (3D) C/C composite from high temperature oxidation. The powder pack consisted of 50% Si, 40% SiC, and 10% Al2O3. The specimens were heat-treated at 1600°C in Argon atmosphere for 2 hours. Then, the oxidation resistance of coated substrates was studied at 1500°C for 3 hours. The phase microstructure and element distribution of the coating before and after oxidation were investigated by X-Ray diffraction and SEM. The formation of SiC diffusion coating was confirmed, including the compositional gradient of C and Si elements on the substrates. The oxidation results of SiC coated specimens show that the amount of SiO2 phase formed on the graphite is much more than C/C composite. Furthermore, because of the high viscosity of SiO2, it can seal most of the pores on the SiC surface formed on the graphite. Finally, the oxidation test resulted in 40 mg/cm2 and 7.5 mg/cm2 weight loss for C/C composite and graphite specimens, respectively.
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