Ablation behaviors and mechanism of ultra‐thick anti‐oxidation layer coating on carbon‐bonded carbon fiber composites.

To enhance the oxidation resistance capability of the carbon‐bonded carbon fiber composites (CBCFs), a silicide ultra‐thick coating as high as 1.6 mm with gradient structure is designed and fabricated via a multi‐step rapid sintering method. Compared with other ceramic layers on carbon fiber‐based composites, ultra‐thick anti‐oxidation layer coated‐CBCFs have the lowest thermal conductivity. Additionally, ablation behaviors of the ultra‐thick ceramics layer coated‐CBCFs under the oxyacetylene torch are also investigated. After being exposed to oxyacetylene torch, the ultra‐thick ceramics layer coated‐CBCFs possess a linear rate range from 0.6 to 1.2 μm/s, while a mass ablation rate ranges from 4.95 × 10−5 g/m2 s to 1.45 × 10−3 g/m2 s. [ABSTRACT FROM AUTHOR]