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在600℃以内,氧化铈粉体在3～5μm波段的红外发射率随着测试温度的升高而降低。通过设计关于热处理的正交实验和单因素实验,发现采用以4℃/min的升温速率升至1300℃保温4h后,氧化铈粉体在常温下的发射率最低,可降至0.37;测试温度升至600℃时,发射率则可降至0.3,可以考虑作为发动机用红外低发射率耐高温涂层的填料。通过XRD、SEM等表征手段,分析了热处理引起发射率变化的原因。
Within 600 ℃, the infrared emissivity of cerium oxide in 3 ~ 5μm band decreases with the increase of test temperature. By designing the orthogonal experiment and single factor experiment about heat treatment, we found that the emissivity of cerium oxide powder is the lowest at room temperature, which can be reduced to 0.37 after the temperature is raised to 1300 ℃ for 4h at the rate of 4 ℃ / min. The test temperature Emitted to 600 ℃, the emissivity can be reduced to 0.3, can be considered as the engine with infrared low emissivity high temperature coating filler. By XRD, SEM and other means of characterization, analysis of the cause of emissivity changes caused by heat treatment.