材料科学
纳米压痕
金属间化合物
铱
涂层
微观结构
胶结(地质)
冶金
复合材料
合金
生物化学
催化作用
化学
水泥
作者
Fayuan Li,Li’an Zhu,Kaili Zhang,Zhen Wang,Yicong Ye,Shun Li,Yu Tang,Shuxin Bai
标识
DOI:10.1016/j.jmrt.2024.01.067
摘要
An Ir–Zr intermetallic coating was prepared onto Re/Ir coated graphite through a pack cementation method. The microstructure, nanoindentation and ablation behaviors of the coating system were investigated. The Ir–Zr coating was about 20 μm thick and consisted of 4 intermetallic phases which showed a quasi-gradient transition in composition. Nanoindentation measurements indicated that most of the intermetallic phases had higher hardness but lower Young's modulus compared to pure iridium. By ablation test in a high-frequency plasma wind tunnel, the heat flux limit of the Ir–Zr coating was measured to be about 6.1 MW/m2, and the endurance time was about 100 s under this condition. The coating failed at ∼2240 °C during the ablation test when the iridium melted, but the unfused parts remained complete and in good adhesion with the iridium beneath. The average normal emissivity between 2 and 5 μm of the sample was measured to be ∼0.82 at around 2092 °C before failure, which was higher than pure iridium and bulk ZrO2.
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