摘要
低温泵中低温板上的吸附材料对低温泵的性能具有重要影响。以无机粘结剂为主成型剂、柔性聚氨酯为添加剂制备了涉氚气体低温真空泵中的活性炭吸附层,分析聚氨酯质量分数对活性炭吸附层比表面积的影响以及成型剂质量分数与活性炭吸附层物理机械性能间的关系,并详细研究涂覆吸附材料的低温板的抗温度冲击性能。实验结果表明:在成型剂中添加质量分数4.5%柔性聚氨酯,改善了成型剂在活性炭表面的润湿性,在增加了活性炭吸附层的抗压强度以及吸附层在低温板上附着力的同时,使得活性炭吸附层在77—353 K的温度区间内的抗温度冲击性能提高了2.18倍,研制的活性炭吸附层更能满足低温泵的运行需求。
The adsorbing material on the cryopanel in the cryopump has a strong influence on the performance of the cryopump.The activated carbon adsorbing layer used in a tritium-related cryopump was prepared with inorganic binder as the main layer-forming agent and flexible polyurethane as an additive.The effects of polyurethane mass fraction on the specific surface area of the activated carbon adsorbing layer were explored,and the relationship between the layer-forming agent mass fraction and the physical and mechanical properties of the activated carbon adsorbing layer were analyzed.Also,the temperature shock resistance of the cryopanel coated with the adsorbing material was studied in detail.The experimental results show that the wettability of the layer-forming agent on the surface of the activated carbon is improved by adding 4.5%mass fraction of flexible polyurethane to the layer-forming agent,which increases the compressive strength of the adsorbing layer and the adhesion of the adsorbing layer on the cryopanel,and the temperature shock resistance of the activated carbon adsorbing layer in the temperature range of 77-353 K is increased by 2.18 times.The as-prepared activated carbon adsorbing layer can better meet the operating requirements of the cryopump.
作者
李朝
郝彬琦
徐倩鑫
周何
常振旗
LI Chao;HAO Binqi;XU Qianxin;ZHOU He;CHANG Zhenqi(Department of Nuclear Science and Engineering,University of Science and Technology of China,Hefei 230026,Anhui Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2023年第12期25-29,76,共6页
Chemical Engineering(China)
基金
国家自然科学基金面上项目(21978279)
科技部国家磁约束聚变能发展研究专项项目(2017YFE0300504)。
关键词
低温泵
活性炭吸附层
成型剂
比表面积
温度冲击
cryopump
activated carbon adsorbing layer
layer-forming agent
specific surface area
temperature shock
