Abstract
High performance oxidation resistant Si-SiC coating for C/C composites was prepared by a two-step pack cementation method using silicon, graphite powders as source materials and Al2O3, MgO, B2O3 as additives. XRD analyses revealed that the obtained coating was composed by β-SiC, Si and α-SiC; SEM analyses displayed that the as-prepared coating exhibited dense surface and cross-section microstructures. Isothermal oxidation test in air at 1773 K showed that the weight loss of the as-obtained Si-SiC coating coated sample after 200h was only 4.42 × 10–4 g.cm–2. The main cause of the weight loss of the coated sample after long time oxidation is due to the vaporization and exhausting of SiO2 glass film which could not provide sufficient glass phase to seal the holes.
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