标准编号：ISO 22007-2:2015
中文名称：塑料 导热率和热扩散率的测定 第2部分：瞬态平面热源（热盘）法
英文名称：Plastics — Determination of thermal conductivity and thermal diffusivity — Part 2: Transient plane heat source (hot disc) method
发布日期：2015-08
标准范围
This part of ISO 22007 specifies a method for the determination of the thermal conductivity andthermal diffusivity, and hence the specific heat capacity per unit volume of plastics. The experimentalarrangement can be designed to match different specimen sizes. Measurements can be made in gaseousand vacuum environments at a range of temperatures and pressures.This method is suitable for testing homogeneous and isotropic materials, as well as anisotropic materialswith a uniaxial structure. The homogeneity of the material extends throughout the specimen and nothermal barriers (except those next to the probe) are present within a range defined by the probingdepth(s) (see 3.2 below).The method is suitable for materials having values of thermal conductivity, λ, in the approximaterange 0,010 W?m?1?K?1 < λ < 500 W?m?1?K?1, values of thermal diffusivity, α, in the range5 × 10?8 m2?s?1 < α < 10?4 m2?s?1, and for temperatures, T, in the approximate range 50 K < T < 1 000 K.NOTE 1 The specific heat capacity per unit volume, C, can be obtained by dividing the thermal conductivity, λ,by the thermal diffusivity, α, i.e. C = λ/α, and is in the approximate range 0,005 MJ?m?3?K?1 < C < 5 MJ?m?3?K?1. It isalso referred to as the volumetric heat capacity.NOTE 2 If the intention is to determine the thermal resistance or the apparent thermal conductivity in thethrough-thickness direction of an inhomogeneous product (for instance a fabricated panel) or an inhomogeneousslab of a material, reference is made to ISO 8301, ISO 8302, and ISO 472.The thermal-transport properties of liquids can also be determined, provided care is taken to minimizethermal convection.
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