致冷镜相变材料的实验研究及应用分析
Experimental research and application analysis of solid-to-liquid phase-change material
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摘要: 研发了一种用于相变致冷的高热导率、固液转换时体积变化率小以及膨胀系数与Si基底接近的镓基相变合金材料；在实验室里模拟实际工况，对镓基相变合金材料试件进行了实验测试，确定某一组分编号可基本满足实际使用需求的镓基相变合金材料。按照实际应用条件对在强激光条件下填充在硅镜内部的该相变材料的应用效果进行了有限元的仿真计算, 结果表明：在初始温度为298 K的真空绝热环境中，热流密度为0.198 4 W/mm2,采用该镓基相变合金材料能够将镜面温度控制在313 K，抑制了镜面的热畸变。Abstract: The paper presents a kind of researching PCM of gallium-based alloy material with high heat conductance, low volume variation rate in solid-to-liquid phase and low linear expansion coefficients. In the laboratory the actual conditions are simulated to test the PCM samples, which confirms that a group of PCM samples of gallium alloy material can meet the basic need. Then, the finite element method is used to simulate the performance of PCM under actual application condition. The results show that in the vacuum insulation conditions and at 298 K original temperature the developed gallium-based alloy PCM can help to control the mirror temperature below 313 K and control thermal distortion of the mirrors.
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