ZrB2–SiC Oxidation Protective Coating on C/C Composites Prepared by Vapor Silicon Infiltration Process
ZrB2–SiC coating on C/C composites was prepared through vapor silicon infiltration process. The coated C/C composites showed excellent oxidation performance at 1500°C. Isothermal oxidation results showed that there was weight gain accompanied in the whole oxidation process and no evidence of oxidation of C/C composite substrate was observed. The thickness of coating increased from 120 m to about 200 m after oxidizing at 1500°C. Three distinct layers could be observed in the coating, namely, outer SiO2-rich layer, middle ZrB2-rich layer, and inner SiC-rich layer. ZrB2 particles were coarsened after oxidation.
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Document Type: Research Article
Publication date: 2010-04-01