涉氚环境下聚酰亚胺的密封性能评估

Evaluation on Sealing Properties of Polyimide under Tritium Surroundings

摘要: 对几种拟用于氚处理环境中的聚酰亚胺密封材料性能指标如压缩率和回弹率、压缩永久变形量、抗氚辐照性能、漏率等进行了系统研究。结果表明，S-03和PI-100型聚酰亚胺的回弹率大于30%，压缩率小于30%，应力松弛率小于25%，压缩永久变形量小于10%，其性能指标完全满足密封元件要求；在氚气氛环境下静态贮存一段时间后，其性能指标均有不同程度变化，但仍满足密封要求。因此，S-03和PI-100型聚酰亚胺密封材料完全满足在氚环境下的使用要求，有望替代聚四氟乙烯密封材料。

Abstract: Researches on compressibility, rebound degree, compaction permanent deformation, tritium an-tiradiation properties, permeability etc. were carried out on several polyimide sealing materials under tritium surroundings. The results declare that two kinds of polyimide materials S-03 and PI-100 which rebound degree over 30% and compressibility less-than 30%, stress relaxation less-than 25% and compaction permanent deformation less-than 10% meet the demand of sealing component guideline. The permeability of all the polyimide materials is meeting the demand of sealing under tritium surroundings. Thus, two kinds of polyimide materials S-03 and PI-100 meet the demand of operating requirement in tritium environment, and they are hopeful substitutes on Teflon sealing materials.