Ablation-resistant Ir/Re coating on C/C composites at ultra-high temperatures

• 作者: Hong Zhang Li-An Zhu Shu-Xin Bai Yi-Cong Ye
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: RARE METALS(Monthly)
• 页码范围: 199-208
• 页数: 10页
• 语种: 英文
• DOI: 10.1007/s12598-015-0509-2

摘要

An iridium/rhenium (Ir/Re) double-layer coat-ing was prepared on carbon/carbon (C/C) composites by chemical vapor deposition (CVD) and electrodeposition.The morphologies and bond strengths of the coatings on the C/C substrate were examined.The ablation resistance of the Ir/Re coating was studied at 1800 ℃ in an oxy-acetylene torch flame for 300 s.The results show that Re interlayer increases the bond strength between Ir coating and C/C substrate by over 100 ％.During entire high-temperature ablation process,Ir/Re coating keeps intact without any signs of ablation damage.Ir coating gets smoother and the grain size becomes larger after ablation,with the preferred orientation changing from <311> to<220>.Although some voids are observed along the grain boundaries of the as-ablated Ir coating,Ir/Re coating keeps intact on C/C composites.The study indicates that Ir/Re coating can provide good ablation resistance up to 1800 ℃for C/C composites,especially for the continuous ablation applications.