ISO 22007-2:2022 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

标准编号：ISO 22007-2:2022

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：2022-06

标准范围

本文件规定了一种测定塑料的热导率和热扩散率以及因此每单位体积的比热容的方法。实验装置可以设计成匹配不同的样品尺寸。可以在一定温度和压力范围内的气体和真空环境中进行测量。该方法为测试均匀和各向同性材料以及具有单轴结构的各向异性材料提供了指南。材料的均匀性延伸到整个样品，并且在探测深度限定的范围内不存在热障（除了靠近探头的那些）（见3.1）。该方法适用于热导率λ值约为0.010？W？m？1？K？1？<？不？<？500？W？m？1？K？1，热扩散率α的值在5？×？10？8？m2？s？1？<？什么？<？10？4？m2？s？1，并且对于温度T，在大约50？K？<？T？<？1？000？K.笔记？1？单位体积的比热容，C，C？=？问:cp，其中ρ是密度，cp是单位质量和恒定压力下的比热，可以通过将热导率λ除以热扩散率α，即C？=？λ/α，并且在大约0,005的范围内？MJ？m？3？K？1？<？C？<？5？MJ？m？3？K？1.也称为体积热容。笔记？2？如果目的是确定非均匀产品（例如装配式面板）或材料的非均匀板材在整个厚度方向上的热阻或表观热导率，则参考ISO？8301，ISO？8302和ISO？472.还可以确定液体的热传输特性，只要注意使热对流最小化。

This document specifies a method for the determination of the thermal conductivity and thermal diffusivity, and hence the specific heat capacity per unit volume of plastics. The experimental arrangement can be designed to match different specimen sizes. Measurements can be made in gaseous and vacuum environments at a range of temperatures and pressures.This method gives guidelines for testing homogeneous and isotropic materials, as well as anisotropic materials with a uniaxial structure. The homogeneity of the material extends throughout the specimen and no thermal barriers (except those next to the probe) are present within a range defined by the probing depth(s) (see 3.1).The method is suitable for materials having values of thermal conductivity, λ, in the approximate range 0,010 W？m^？1？K^？1 < λ < 500 W？m^？1？K^？1, values of thermal diffusivity, α, in the range 5 × 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, C = ρ ？ c_p, where ρ is the density and c_p is the specific heat per unit mass and at constant pressure, 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 is also referred to as the volumetric heat capacity.NOTE 2   If the intention is to determine the thermal resistance or the apparent thermal conductivity in the through-thickness direction of an inhomogeneous product (for instance a fabricated panel) or an inhomogeneous slab 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 minimize thermal convection.

标准预览图