Abstract
High ablation resistant carbon–phenolic (C–Ph) composites were fabricated by the addition of nano silica powder and tested under plasma arc jet at a flux of 2.5 MW m −2 . Nano silica C–Ph composites exhibited much higher ablation resistance compared to conventional C–Ph composites under similar conditions. Microstructure and X-ray diffraction studies reveal that nano silica reacts with char at high-temperature, forming ablation resistant silicon carbide phase. The mechanism of in situ siliconization and the thermophysical properties of the C–Ph composites are discussed.
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