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Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications IV
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Novel Ir-X Thermal Protection Coatings Designed For Extreme Aerodynamic Heating Environment, Kaili Zhang, Yicong Ye, Li`An Zhu, Shuxin Bai
Novel Ir-X Thermal Protection Coatings Designed For Extreme Aerodynamic Heating Environment, Kaili Zhang, Yicong Ye, Li`An Zhu, Shuxin Bai
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications IV
Due to the rapid evaporation of SiO2 protective layer, most Si-containing oxidation resistant coatings could not withstand a temperature above 1800℃, which is not enough for hypersonic voyage in upper atmosphere. With a higher melting point (2440℃) and lower oxygen permeability（10-20g·m-1·s-1）, iridium is supposed to be a promising coating material for ultra-high temperature applications. However, Iridium has a low emissivity ε(0.017 for 2.5-25μm) and high recombination coefficient γ(0.64 at 1200℃) of atomic oxygen, resulting in a much higher thermal response compared with the ceramic materials under the same aerodynamic environment. To solve this …