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介绍在BaF_2和NaCl基片上镀CaF_2、LaF_3和含氟聚合物(聚四氟乙烯,四氟乙烯与六氟丙烯共聚物、典型的防潮保护膜的加速潮湿试验(温度27～50℃,相对湿度95％,24小时为一个周期)。当BaF_2基片分别镀CaF_2、聚四氟乙烯和LaF_3时,试样的寿命分别从4个周期增加到9、26和42个周期以上。如热处理CaF_2薄膜,能使试样寿命增加2倍。NaCl分别镀CaF_2和聚四氟乙烯后,试样的寿命分别从不到1个周期增加到1和3个周期。NaCl基片镀LaF_3薄膜附着性差。CaF_2薄膜的微硬度测量说明与防潮有直接关系。热处理的作用是把组成薄膜的CaF_2细颗粒烧结以增加薄膜的密度、折射率和硬度,而降低湿气的渗透。在BaF_2和NaCl基片上镀CaF_2和聚四氟乙烯膜具有增透和防潮保护作用。
This paper introduces the accelerated wet tests of CaF_2, LaF_3 and fluoropolymers (polytetrafluoroethylene, tetrafluoroethylene and hexafluoropropylene copolymers, typical moisture-proof protective film on BaF_2 and NaCl substrates (temperature 27 ~ 50 ℃, relative humidity 95% and 24 hours) .When the BaF_2 substrates were coated with CaF_2, Teflon and LaF_3 respectively, the lifetimes of the samples increased from 4 cycles to 9, 26 and 42 cycles respectively.If the heat treatment of CaF_2 thin films , Which can increase the life of the sample by 2 times.After NiCa coated with CaF 2 and Teflon respectively, the life of the sample increased from less than 1 cycle to 1 and 3 cycles respectively.The adhesion of LaCl 3 film on NaCl substrate was poor.CaF 2 The measurement of the microhardness of the film is directly related to moisture proofing.The function of the heat treatment is to sinter the fine particles of the CaF 2 film to increase the density, refractive index and hardness of the film, thereby reducing the infiltration of moisture.At CaF 2 And polytetrafluoroethylene membrane has a penetration and moisture protection.