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Updated: Sep 23, 2025
Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method
Published on: October 6, 2017
Fabrication of low-density carbon-bonded carbon fiber composites with an Hf-based coating for high temperature
Lin Xu1, Wenbing Yang1, Zhen Fan1
1Science and Technology of Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials and Technology Beijing 100076 China xulinhit@126.com zhangdahai2014@126.com.
Abstract:
A novel Hf-based anti-oxidation coating has been prepared on the surface of low-density carbon-bonded carbon fiber composites (CBCFs). The coating exhibits a gradient transition structure, with mainly HfB2, Hf2Si and SiC ceramics. Oxyacetylene torch testing has been utilized to evaluate the ablation resistance under the condition ranging from 1.6 MW m-2 to 2.2 MW m-2 for 300 s. The experimental results show that the as-prepared Hf-based coating can effectively protect CBCFs under high-temperature oxidation conditions. The surface maximum temperature can reach 1616-2037 °C, and the mass ablation rates vary from -3.5 × 10-5 g s-1 cm-2 to 1.5 × 10-5 g s-1 cm-2. The formation of a dense SiO2 glass layer embedded with HfO2 grains or particle accumulation in the HfO2 layer is responsible for the good ablation resistance.
