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Archive > Volume Issue 5 > 2024(5):645-655. DOI:10.16356/j.1005-1120.2024.05.009 Prev Next

Ablation Processes for HfC-Coated 2.5D Needle-Punched Composites Used for Aerospace Engines Under Hypersonic Flight Conditions

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    Abstract:
    The working environment of aerospace engines is extremely harsh with temperature exceeding 1 700 ℃ and accompanied by thermal coupling effects. In this condition， the materials employed in hypersonic aircraft undergo ablation issues， which can cause catastrophic accidents. Due to the excellent high-temperature stability and ablation resistance， HfC exhibits outstanding thermal expansion coefficient matching that of C/SiC composites. 2.5D needle-punched C/SiC composites coated with HfC are prepared using a plasma spraying process， and a high-enthalpy arc-heated wind tunnel is employed to simulate the re-entry environment of aircraft at 8 Mach and an altitude of 32 km. The plasma-sprayed HfC-coated 2.5D needle-punched C/SiC composites are subjected to long-term dynamic testing， and their properties are investigated. Specifically， after the thermal assessment ablation experiment， the composite retains its overall structure and profile； the total mass ablation rate is 0.074 45 g/s， the average linear ablation rate in the thickness direction is -0.067 5 μm/s， and the average linear ablation rate in the length direction is 13.907 μm/s. Results verify that plasma-sprayed HfC coating exhibits excellent anti-oxidation and ablation resistance properties. Besides， the microstructure and ablation mechanism of the C/SiC composites are studied. It is believed that this work will offer guideline for the development of thermal protection materials and the assessment of structural thermal performance.

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    Project Supported:
    This work was financially supported by the National Key R&D Program of China （No.2022YFB3-401900）， the National Natural Science Foundation of China （No.U21A20134）， and the Shandong Provincial Natural Science Foundation （Excellent Young Fund， No.

    Clc Number:
    TB332

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