大尺寸金刚石激光闪射法热导率测试研究

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

为解决大尺寸金刚石热导率的测试问题,本文在耐驰LFA467激光闪射仪的基础上,设计了垂直模式和In-Plane模式的φ100 mm测试样品架,从理论分析和实际测试两方面证明了φ100 mm样品架的可行性。从理论分析结果得出,新样品架带来的样品边界条件的变化对测试结果影响不大。从实际测试结果来看,垂直模式和In-Plane模式的φ100 mm样品架的热导率比标准样品架的热导率分别高3.6%和6.5%,仍在可接受范围内。本文设计的φ100 mm样品架最大能够测试φ100 mm的样品,有助于保护样品的完整性,实现激光闪射法大尺寸金刚石热导率的无损测试。

In order to solve the problem of thermal conductivity test of large-size diamond,theϕ100 mm sample holder of vertical mode and In-Plane mode was designed for the NETZSCH LFA467 HyperFlash instrument.The test results of theϕ100 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 theϕ100 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 theϕ100 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.Theϕ100 mm sample holder designed in this paper can testϕ100 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.