摘要
介绍了激光热波技术用于测量薄膜材料和纤维材料热扩散率的测试系统,测试温度范围为20~500℃。讨论了测量中的各种试验条件、基本公式和误差分析。在理论上此系统可以应用于任何厚度样品面向热扩散率的测量。通过对厚度在30~300μm的金属薄膜材料如不锈钢、铝和铜所进行的测量,证明了此测试系统和测试方法是准确可靠的。同时用此测试系统对玻璃布编织材料、有机高分子膜和各种纤维材料的热扩散率进行了测量,表明此系统可以实现从低热扩散率到高热扩散率的测量。特别是通过对有机高分子膜聚欧亚胺的测试,得到其热扩散率星级同不锈钢相同,从而证明了有机高分子膜状材料的热物理性能由于其材料工艺的原‘因与块状材料的热物理性能有区别。
A new device to measure thermal diffusivity of thin films and fibers up to 500℃ was developed by using laser thermal wave technique. The experimental conditions, fundamental equa-tions for the measurement and error analysis are discussed. In principle, this device can be applied no matter how thin a sample may be. The device was used for samples of stainless steel, alu-minium, copper and polymer with the thickness ranging from 30 to 300μm. All these proves that the testing device and method is reliable. This device can also be used to test the thermal diffusivi-ties of glass cloths, polymer films and various kinds of fibers. All these experiments indicates that this device is fit to test the high or low thermal diffisivities. By testing the polyimide films, it is ob-tained that it's thermal diffusivity is of the same order of magnitude as that of stainless sted, which proves that the thermal properties of polymer films are different from those of bulk materials due to different processing conditions. It is concluded that this device is useful for measurement of thin materials and fibers with a variety of thermal diffusivities.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
1997年第2期49-53,共5页
Aerospace Materials & Technology
关键词
薄膜
纤维
热扩散率
激光热波法
Thermal diffusivity, Thin film, Fiber, Laser thermal wave method