Abstract
The infrared high emissivity ceramic material plays an important role in thermal protection of hypersonic vehicles. LaCrO3, characterized by excellent thermal stability and high emissivity, can be applied as infrared high emissivity material. LaCrO3 and Mg2+ doped LaCrO3 were prepared via solid state reaction method. XRD analyses showed that LaCr1-xMgxO3 (x = 0, 0.1, 0.2, 0.25, 0.3) were single-phase solid solutions. The doping-effect of Mg2+ on the infrared emissivity was investigated. In the range of 2.5–8 μm, the infrared emissivity of all doped materials had significant improvement, the average emissivity of materials increased from 0.66 to 0.83. In the range above 8 μm, the emissivity of all materials had a similar trend and compared to LaCrO3, the emissivity of Mg2+ doped LaCrO3 had little decrease.
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