利用顶杆法膨胀仪，探讨了材料结构、密度与热膨胀的关系，用其它实验方法交叉结合对材料的相变进行了研究，并通过热膨胀曲线确定某些材料的特定工艺参数，实验证实了热膨胀在材料热学性能研究领域中是一种非常简捷、可靠、实用的工具之一 The relationship between material structure, density and thermal expansion was discussed by the top rod dilatometer. The phase transition of the material was studied by cross-linking with other experimental methods. The thermal expansion curve was used to determine the specific process parameters of some materials. The thermal expansion One of the most simple, reliable and practical tools in the field of thermal properties of materials