Summary of the Method for Sealing (Leakage) Examination
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摘要:密封是保证产品可靠作用的重要措施，无论是真空元器件，还是军工产品等均需进行密封试验，特别是空间技术中所用的器件如点火器、引爆装置都需进行密封检验。美国马歇尔飞行中心对电器做了大量密封性试验，发现由于泄漏致使9.8%~38.0%产品失效。泄漏可分为“粗漏”和“细漏”两种，其对应的检验方法也不相同：粗漏一般用气泡法；细漏检验用氦质谱法和放射性示踪法等。本文全面简要系统介绍了各种密封性检测方法。重点就氦质谱法的原理、检验方法做了较详细论述。
Abstract:Sealing ability is an important measure for ensuring the reliable function of products. Vacuum comp-onents and military used products, especially all devices for use in space technology, such as ignitors, explosive devices, need sealing examination. Marshall aircraft fly center of U.S. has made a lot of sealing tests for electrical equipments. As a result, they have found that there were 9.8%~38.0% products failed in the test because of leakage. There are two kinds of leakages. One is "thick", the other is "thin". The corresponded examining method of the two is not the same. Generally, "thick" leakage shall be examined by using air bubble method, thin leakage shall be examined by using mass spectrographic analysis of helium and tracer determination method of radioactivity etc. Various kinds of examination method of sealing ability are given. Examination method of mass spectrographic analysis of helium have been mainly described in the paper.
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