ASTM E1225-1999 通过隔绝--比较--轴向热流技术对固体导热性的试验方法

标准号：ASTM E1225-1999
中文标准名称：通过隔绝--比较--轴向热流技术对固体导热性的试验方法
英文标准名称：Standard Test Method for Thermal Conductivity of Solids by Means of the Guarded-Comparative-Longitudinal Heat Flow Technique
标准类型：A42
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：A42
国际标准分类号：17.200.10 (Heat. Calorimetry)
适用范围： -For purposes of this technique, a system is homogeneous if the apparent thermal conductivity of the specimen, [lambda] , does not vary with changes of thickness or cross-sectional area by more than +5%. For composites or heterogeneous systems consisting of slabs or plates bonded together, the specimen should be more than 20 units wide and 20 units thick, respectively, where a unit is the thickness of the thickest slab or plate, so that diameter or length changes of one-half unit will affect the apparent [lambda] by less than +5%. For systems that are non-opaque or partially transparent in the infrared, the combined error due to inhomogeneity and photon transmission should be less than +5%. Measurements on highly transparent solids must be accompanied with infrared absorption coefficient information or the results must be reported as apparent [lambda] . Note 2-This test method may also be used to evaluate the thermal conductance/resistance of materials in contact.