【摘要】 采用闪光法对柔性导热垫片的热扩散系数进行测量，分析了影响热扩散系数测量结果的不确定度来源，包括热扩散系数测量重复性、厚度测量、半升温时间及仪器示值误差等因素，评定得到厚度0.5 mm的超薄柔性导热垫片在25℃、50℃和150℃下的热扩散系数的相对扩展不确定度结果均为5.8%(k=2)，结果表明闪光法测量超薄柔性导热垫片热扩散系数在不同温度下的一致性较好。更多还原

【Abstract】 In this paper, the flash method is used to measure the thermal diffusivity of flexible thermal conductive pads, and the sources of uncertainty that affect the measurement results of the thermal diffusivity are analyzed. The sources of uncertainty include factors such as the measurement repeatability of the thermal diffusivity, thickness measurement, half-temperature rise time, and the indication error of the instrument. The evaluation of uncertainty shows that the relative expanded uncertainty results of the thermal diffusivity of the ultra-thin flexible thermal conductive pad with a thickness of 0.5 mm at 25℃, 50℃ and 150℃ are all 5.8%(k=2).The results demonstrate that the flash method has good consistency in measuring the thermal diffusivity of flexible thermal conductive pads at different temperatures.更多还原