1.1 本试验方法包括测定主要均匀各向同性固体材料的热扩散率。热扩散率值范围为0.1至1000（mm） 2. s -1 可通过该测试方法在75到2800之间测量 K 1.2 实践 E2585 是本试验方法的附件，包含有关使用闪光法的详细信息。这两个文件是相辅相成的。 1.3 该测试方法是测试方法的更详细形式 C714 ，适用于更广泛的材料、应用和温度范围，并提高了测量精度。 1.4 本试验方法旨在允许多种仪器设计。在这种类型的测试方法中，确定施工细节和程序以涵盖可能给缺乏相关技术知识的人带来困难的所有意外事件，或限制基本技术改进的研究和开发，是不现实的。 1.5 本试验方法适用于在基本上完全致密（最好是低孔隙率）、均匀且各向同性的固体材料上进行的测量，这些材料对施加的能量脉冲不透明。 经验表明，对这些严格准则的一些偏离可以通过谨慎和适当的实验设计来适应，从而大大扩大了该方法的实用性。 1.6 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。 1.7 对于使用激光作为电源的系统，必须完全满足安全要求。 1.8 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。 1.9 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 热扩散率是一种重要的瞬态热特性，用于设计应用、确定安全工作温度、过程控制和质量保证等目的。 5.2 闪光法用于测量各种固体材料的热扩散系数α值。 由于试样几何形状简单、试样尺寸要求小、测量速度快且易于处理，因此它特别具有优势。 5.3 在某些严格条件下，当以定量方式使用该方法时，可以确定均质各向同性不透明固体试样的比热容（见 附录X2 ). 5.4 热扩散率结果以及比热容的相关值( C p )和密度（ρ）值，在许多情况下可以根据以下关系得出热导率（λ）:

1.1 This test method covers the determination of the thermal diffusivity of primarily homogeneous isotropic solid materials. Thermal diffusivity values ranging from 0.1 to 1000 (mm) 2 s -1 are measurable by this test method from about 75 to 2800 K. 1.2 Practice E2585 is adjunct to this test method and contains detailed information regarding the use of the flash method. The two documents are complementing each other. 1.3 This test method is a more detailed form of Test Method C714 , having applicability to much wider ranges of materials, applications, and temperatures, with improved accuracy of measurements. 1.4 This test method is intended to allow a wide variety of apparatus designs. It is not practical in a test method of this type to establish details of construction and procedures to cover all contingencies that might offer difficulties to a person without pertinent technical knowledge, or to restrict research and development for improvements in the basic technique. 1.5 This test method is applicable to the measurements performed on essentially fully dense (preferably, but low porosity would be acceptable), homogeneous, and isotropic solid materials that are opaque to the applied energy pulse. Experience shows that some deviation from these strict guidelines can be accommodated with care and proper experimental design, substantially broadening the usefulness of the method. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 For systems employing lasers as power sources, it is imperative that the safety requirement be fully met. 1.8 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. 1.9 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 Thermal diffusivity is an important transient thermal property, required for such purposes such as design applications, determination of safe operating temperature, process control, and quality assurance. 5.2 The flash method is used to measure values of thermal diffusivity, α, of a wide range of solid materials. It is particularly advantageous because of simple specimen geometry, small specimen size requirements, rapidity of measurement and ease of handling. 5.3 Under certain strict conditions, specific heat capacity of a homogeneous isotropic opaque solid specimen can be determined when the method is used in a quantitative fashion (see Appendix X2 ). 5.4 Thermal diffusivity results, together with related values of specific heat capacity ( C p ) and density (ρ) values, can be used in many cases to derive thermal conductivity (λ), according to the relationship: