Thermal conductivity is a basic parameter to characterize the material′s heat transfer ability.It is closely related to the type of material and process parameters such as temperature and pressure during the molding process.Therefore,the sample preparation test may not reflect the characteristics of the real product,and it needs to be suitable for the local thermal conductivity of irregularly shaped samples.A test method based on laser thermal imaging is proposed to reduce the heat transfer time to ensure that the thermal response is only sensitive to materials in a local area.The temperature field evolution data recorded by high-resolution thermal imaging simultaneously inverts the spot distribution and material thermal conductivity.The powder-formed ferrite samples were used for experimental verification.Ten repeated experiments were performed on the regular samples.The relative standard deviation was 2.3 %,and the relative deviation between the mean and the test results of the Hot-Disk method was 0.1 %.For the irregular-shaped samples,3 positions tested with a maximum relative deviation of 1.6 %.This method is expected to be used for in-situ non-destructive testing of irregularly shaped,small-sized,non-uniform material parts.
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张绩松,王晓娜,侯德鑫,叶树亮.基于激光热成像的局部导热系数测试[J].激光与红外,2020,50(12):1426~1432 ZHANG Ji-song, WANG Xiao-na, HOU De-xin, YE Shu-liang. Local thermal conductivity measurement based on laser thermography[J]. LASER & INFRARED,2020,50(12):1426~1432