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Ablation and surface heating behaviors of graphite based Ir-Al coating in a plasma wind tunnel.

Authors :
Zhang, Kaili
Bai, Shuxin
Zhu, Lian
Ye, Yicong
Zhang, Hong
Ai, Yuanlin
Li, Shun
Tang, Yu
Source :
Surface & Coatings Technology. Jan2019, Vol. 358, p371-377. 7p.
Publication Year :
2019

Abstract

Abstract The ablation and surface heating behaviors of iridium and Ir-Al coatings on graphite substrates under non-equilibrium conditions were investigated in a plasma wind tunnel. The results showed that the iridium coating had a much higher thermal response than the Ir-Al coating in non-equilibrium conditions. The iridium coating melted at a heat flux of 2.03 MW/m2 with the surface temperature up to 2494 °C, while the surface temperature of the Ir-Al coating was only 1330 °C at this condition. When the heat flux rose to 3 MW/m2, the surface temperature of the Ir-Al coating stayed at ~1520 °C. After continuous ablation at this condition for 500 s, the Ir-Al coating remained intact. It can be concluded that the Al alloying modification could largely improve the ablation resistance of an iridium coating. The present research proposed a novel idea for ultra-high temperature coating for hypersonic applications. Highlights • Pure iridium coating had a heat response of over 2440°C at a heat flux of 3MW/m2 in plasma wind tunnel • Ir-Al coating could withstand a heat flux of more than 3 MW/m2 in plasma wind tunnel • Surface temperature of Ir-Al was about 1000°C lower than iridium coating at the same condition [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02578972
Volume :
358
Database :
Academic Search Index
Journal :
Surface & Coatings Technology
Publication Type :
Academic Journal
Accession number :
133827169
Full Text :
https://doi.org/10.1016/j.surfcoat.2018.10.047