Abstract
The Ce1-xYxO2-x/2 samples were synthesized with different doping amount by solid state reaction method. Phase structures of the samples were analyzed and characterized by XRD. The effects of different doping amount on infrared emissivity properties at 3-5µm wavebands were investigated systematically. It is found that the powder with doping molality of x=0.2 exhibits the lowest infrared emissivity value ca. 0.21 when the test temperature is 600 °C. The mechanism for the low infrared emissivity is explored thoroughly. The reduction of infrared emissivity with increasing temperature is ascribed to the enhancement of electrical conductivity. Our results suggest that Ce1-xYxO2-x/2 powder with x=0.2 is a potential candidate for stealth material of aircraft engines.
Highlights
The infrared (IR) radiation of an aircraft is one of the most important factors which affect the detection range of an IR detection system [1]
IR radiation from a specific exhaust system can be attributed to two parts: hot plume IR radiation and high temperature engine parts IR radiation, such as that of nozzle, and turbine blades [2]
In order to improve the survivability of military targets on the battlefield, it is important to develop the materials with low emissivity at high temperature
Summary
The infrared (IR) radiation of an aircraft is one of the most important factors which affect the detection range of an IR detection system [1]. As for Aircraft engine, it usually produces strong infrared radiation because of its high working temperature, which renders the aircraft exposed to the enemy [3]. In order to improve the survivability of military targets on the battlefield, it is important to develop the materials with low emissivity at high temperature. In order to improve the conductivity of CeO2 samples, doping is the most effective and convenient method. In order to reduce the effect of lattice distortion on the conductivity of CeO2 samples, Y3+ ions (90 pm) with similar radii to Ce4+ ions are the appropriate doping ions [12]. We proposed the Y3+ ions doped CeO2 samples via solid state reaction method in this work, and the influences of doping molality on conductivity and infrared emissivity are discussed in detail
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