Development of tin-plated regenerator material

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Xu, M.Y.^1 ; Morie, T.^1 ; Tsuchiya, A.^1

Technology Research Center, Sumitomo Heavy Industries, Ltd., 2-1-1 Yato-cho, Nishitokyo-shi, Tokyo

188-8585, Japan^1

关键词: Bronze screens;    Comparison test;    Cooling Capacity;    Diameter ratio;    G-m cryocooler;    Low pressures;    Regenerator materials;    Temperature decrease;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012076/pdf
DOI  :  10.1088/1757-899X/171/1/012076

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

To improve the efficiency of a cryocooler, it is vital to improve the regenerator. In general, the heat capacity of materials decreases as temperature decreases. Thus, when temperature is below 50 K, lead spheres are often used as a regenerator material. However, the pressure drop through a sphere regenerator is larger than that through a screen regenerator. To overcome this dilemma, a new, low pressure loss tin-plated screen is proposed. A comparison test was performed with a two-stage GM cryocooler by replacing part of the first stage regenerator material, bronze screens with tin-plated screens. Compared to a regenerator filled with bronze screens, the cooling capacity of the first stage increased by about 14% at 40 K and 90% at 30 K with such tin-plated screens. The ratio of the wire diameter before and after the deposition was also optimized. An optimum cooling capacity of 53.5 W at 40 K was obtained at a diameter ratio of about 1.4. The detailed experimental results are reported in this paper.