Standard Guide for Thermal Diffusivity of Carbon and Graphite by Thermal Pulse Method

Importancia y uso:

5.1 Thermal diffusivity is an important property required for such purposes as design applications under transient heat flow conditions, determination of safe operating temperature, process control, and quality assurance.

5.2 The flash method is used to measure values of thermal diffusivity (α) of a wide range of solid materials. It is particularly advantageous because of the simple specimen geometry, small specimen size requirements, rapidity of measurement, and ease of handling materials having a wide range of thermal diffusivity values over a large temperature range with a single apparatus. The short measurement times involved reduce the chances of contamination and change of specimen properties due to exposure to high temperature environments.

5.3 Thermal diffusivity results in many cases can be combined with values for specific heat (C_p) and density (ρ) to derive thermal conductivity (λ) from the relation λ = αC_pρ. For guidance on converting thermal diffusivity to thermal conductivity, refer to Practice C781.

5.4 This test method described in this guide can be used to characterize graphite for design purposes.

5.5 Test Method E1461 is a more detailed form of this test method described in this guide and has applicability to much wider ranges of materials, applications, and temperatures.

Subcomité:

D02.F0

Referida por:

C1793-15R24, C1783-15R24, C1470-20, E1461-13R22, D7775-21

Volúmen:

05.05

Número ICS:

71.060.10 (Chemical elements)

Palabras clave:

carbon; graphite; thermal conductivity; thermal diffusivity;