TEM of PDCs and corresponding coating, ablation temperature response curves and the microstructure evolution for the coatings. (IMAGE)

Tsinghua University Press

TEM of PDCs and corresponding coating, ablation temperature response curves and the microstructure evolution for the coatings.

Caption

Graphene shells with high thermal conductivity were introduced into polymer-derived SiC/TaC ceramics by adding DVB in polymers. The corresponding ZrC–SiC/TaC@C coating on SiC-coated carbon/carbon composites was fabricated by SAPS. The graphene shell in the ZrC–SiC/TaC@C coating had a robust heat dissipation effect for lowering the surface temperature to approximately 200 °C under an oxyacetylene torch with a heat flux of 2.38 mW/m2. The graphene shell in the ZrC–SiC/TaC@C coating delayed sintering of Ta-doped ZrO2 particles, resulting for the smaller grain sizes and forming a denser ZrO2 coating, further prolonging the anti-ablation life.

Credit

Journal of Advanced Ceramics, Tsinghua University Press

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