Thermal Conductivity Test of Large-Size Diamond by Laser Flash Method

Abstract

Abstract: In order to solve the problem of thermal conductivity test of large-size diamond, the ϕ100 mm sample holder of vertical mode and In-Plane mode was designed for the NETZSCH LFA467 HyperFlash instrument. The test results of the ϕ100 mm sample holder are proved to be credible from both principle and test results. From the theoretical analysis, it is concluded that the change of sample boundary conditions brought by the new sample holder has little effect on the test results. The thermal conductivity test results of the ϕ100 mm sample holder in the In-Plane mode are 6.5% higher than that of the standard sample holder, and the thermal conductivity test results of the ϕ100 mm sample holder in the vertical mode are 3.6% higher than that of the standard sample holder. The test results are still within the acceptable range. The ϕ100 mm sample holder designed in this paper can test ϕ100 mm samples at most, which helps to protect the integrity of samples. In this paper, the non-destructive testing of thermal conductivity of large-size diamond by laser flash method is realized.

Key words: diamond, laser flash method, thermal conductivity, large-size, thermal diffusivity

CLC Number:

TQ163

ZHANG Yalin, AN Xiaoming, GE Xingang, JIANG Long, LI Yifeng. Thermal Conductivity Test of Large-Size Diamond by Laser Flash Method[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(3): 503-510.

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