奥氏体不锈钢导热系数的测定

Measurement of Thermal Conductivity for Austenitic Stainless Steel (SRM735) Below 300 K

本文描述300K以下金属导热系数的实验装置、控温系统、本实验室研制的奥氏体不锈钢(SRM-735)样品的特性及其导热系数的测量结果,并与NBS的推荐值作了比较,在(8～300)K范围内,导热系数相差±2.5％。测量的不确定度在300K时为±2.5％,在200K时为±2.0％,在100K时为±1.1％,在35K以下小于±4.0％。

An apparatus for precise measurement of thermal conductivity of Austenitic stainless steel (SRM735) below 300 K is described. Thermal conductivity and characteristic data are given for the specimens prepared in NIM. Comparing the results of this research with those of NBS, it shows that the measured values of thermal conductivity of NIM are in agreement with the recommended values of NBS within ±2.5% in the range of 8 to 300 K. The uncertainty of thermal conductivity measurement is estimated to be ±2.5% at 300 K,±2.0% at 200 K,±1.1% at 100K and ±4% below 35 K.