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Thermal Diffusivity Research of PI/SiO_2 Films by Laser Flash Method

Guanhu He

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Abstract

Laser flash method was succeeded in thermal diffusivity measurement,and with the heat capacity and density,the thermal conductivity can be calculated out.But it is difficult to apply this method in the thermal diffusivity measurement of semitransparent materials,especially for those materials which were semitransparent both in the infra-red wave length of laser beam and detector.In this paper,a new method has been made up to solve this problem.The diffusivity of polyimide(PI) film was measured in the temperature range of-73 ℃～290 ℃ and the thermal diffusivity of PI/SiO2 composite films with different content of SiO2 were researched also.

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What this paper is about

Laser flash method was succeeded in thermal diffusivity measurement,and with the heat capacity and density,the thermal conductivity can be calculated out.But it is difficult to apply this method in the thermal diffusivity measurement of semitransparent materials,especially for those materials which were semitransparent both in the infra-red wave length of laser beam and detector.In this paper,a new method has been made up to solve this problem.The diffusivity of polyimide(PI) film was measured in the temperature range of-73 ℃～290 ℃ and the thermal diffusivity of PI/SiO2 composite films with different content of SiO2 were researched also.

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Available abstract

Laser flash method was succeeded in thermal diffusivity measurement,and with the heat capacity and density,the thermal conductivity can be calculated out.But it is difficult to apply this method in the thermal diffusivity measurement of semitransparent materials,especially for those materials which were semitransparent both in the infra-red wave length of laser beam and detector.In this paper,a new method has been made up to solve this problem.The diffusivity of polyimide(PI) film was measured in the temperature range of-73 ℃～290 ℃ and the thermal diffusivity of PI/SiO2 composite films with different content of SiO2 were researched also.

Key concepts: Thermal diffusivity, Laser flash analysis, Materials science, Polyimide, Thermal conductivity, Thermal conductivity measurement, Laser, Flash (photography)

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