前言随着宇航事业的迅速发展,许多单位越来越多地采用超低温技术。由于不同材料的热胀冷缩现象而引起的应力集中往往造成产品的损坏而报废。所以,各种新型材料的低温线膨胀系数是材料研究和产品设计中不可缺少的数据之一。 Introduction With the rapid development of the aerospace industry, many units are increasingly using ultra-low temperature technology. Due to the thermal expansion and contraction of different materials caused by stress concentration often result in product damage and scrapped. Therefore, the low temperature coefficient of linear expansion of various new materials is one of the indispensable data in material research and product design.