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

作　　者：ZHANG Ziyi SHI Zhenyu NI Jing WANG Jilai ZHANG Chengpeng 

机构地区：[1]Key Laboratory of High Efficiency and Clean Mechanical Manufacture(Ministry of Education),Shandong University,Jinan 250061,P.R.China [2]School of Mechanical Engineering,Shandong University,Jinan 250061,P.R.China [3]State Key Laboratory of Reliability and Intelligence of Electrical Equipment,School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,P.R.China [4]School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310012,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2024年第5期645-655,共11页南京航空航天大学学报（英文版）

基　　金：financially supported by the National Key R&D Program of China(No.2022YFB3-401900);the National Natural Science Foundation of China(No.U21A20134);the Shandong Provincial Natural Science Foundation(Excellent Young Fund,No.ZR2022YQ48).

摘　　要：The working environment of aerospace engines is extremely harsh with temperature exceeding 1700℃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 0.07445 g/s,the average linear ablation rate in the thickness direction is-0.0675μm/s,and the average linear ablation rate in the length direction is 13.907μm/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.

关 键 词：2.5D needle-punched C/SiC composites ablation mechanism arc-heated wind tunnel experiment high enthalpy flow 

分 类 号：TB332[一般工业技术—材料科学与工程]