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Ablation and surface heating behaviors of graphite based Ir-Al coating in a plasma wind tunnel.
- 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]
- Subjects :
- *WIND tunnels
*GRAPHITE
*IRIDIUM
*ALUMINUM
*ABLATION (Aerothermodynamics)
Subjects
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