1.1 本规程描述了一种测定表观导热系数λ的技术 一 ，和热扩散系数α 一 ，材料。它适用于表观导热系数在约0.02<λ范围内的固体材料 一 如果使用不锈钢304熔渣量热器和K热电偶，在300 K和1100 K之间的近似温度范围内<20 W/（m·K），如果使用氧化铝熔渣量热器和PtRh热电偶，在1600 K以下。 注1: 虽然本规程也应适用于确定非反应材料的热导率和热扩散率，但已发现其在测试反应性耐火材料以及在高温暴露期间发生显著尺寸变化的耐火材料时特别有用。 1.2 以国际单位制表示的数值应视为标准值。 本标准不包括其他计量单位。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 这种做法对测试一般材料（包括复合材料和多层类型）很有用。 5.2 本规程特别适用于在暴露于高温期间发生显著反应或局部尺寸变化或两者兼有的材料，因此难以使用现有标准试验方法（如试验方法）进行评估 C1113 . 5.3 通过在多个加热/冷却循环中执行测试，可以评估反应、相变和反应气体（例如蒸汽）的传质对热性能的影响。 注3: 已发现该规程特别适用于耐火材料的测试。

1.1 This practice describes a technique for the determination of the apparent thermal conductivity, λ a , and thermal diffusivity, α a , of materials. It is for solid materials with apparent thermal conductivities in the approximate range 0.02 < λ a < 20 W/(m·K) over the approximate temperature range between 300 K and 1100 K, if used stainless steel 304 slag calorimeter and K thermocouples, and up to 1600 K, if used Alumina slag calorimeter and PtRh thermocouples. Note 1: While the practice should also be applicable to determining the thermal conductivity and thermal diffusivity of non-reactive materials, it has been found specifically useful in testing fire resistive materials that are both reactive and undergo significant dimensional changes during a high temperature exposure. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This practice is useful for testing materials in general, including composites and multi-layered types. 5.2 The practice is especially useful for materials which undergo significant reactions or local dimensional changes, or both, during exposure to elevated temperatures and thus are difficult to evaluate using existing standard test methods such as Test Method C1113 . 5.3 Performing the test over multiple heating/cooling cycles allows an assessment of the influence of reactions, phase changes, and mass transfer of reactions gases (for example, steam) on the thermal performance. Note 3: This practice has been found to be especially applicable to testing fire resistive materials.