Understanding the controllability of soaking can control the infiltration area of ​​vacuum welding

In recent years, the author has made many in-depth explorations on the manufacturing and application characteristics of active alloy solders. The non-matchable one-step sealing of the vacuum switch tube ceramic shell and the inexpensive metal end cap has been studied and achieved good results. Expected results, tests show that the sealing solder has normal infiltration and good airtightness. Since the active alloy solder foil has good wettability to 95% Al2O3 ceramic but no apparent flooding, the cermet can be sealed in one step only by controlling the non-matching of the ceramic vacuum metal in the inner ring of the solder ring. The necessary quality control factors are few and easy to master. Corrosion-resistant and wear-resistant mortar pump can completely avoid a series of technical difficulties of the high-temperature metallization method. The non-matching of the vacuum switch tube ceramic metal can seal the outside diameter of the sample in one step, so that the solder can be used. The outer diameter of the immersed ring on the ceramic end face is obviously smaller than the outer diameter of the ceramic shell, and the inner diameter of the immersed ring is obviously larger than the inner diameter of the ceramic shell, which is favorable for the improvement of the voltage breakdown resistance of the vacuum switch tube.

However, in the real sense, the one-step sealing that can be achieved with high reliability and low cost sealing is worthy of the name. The active alloy solder foil method of Shanghai sewage pump is the most realistic way. The active alloy solder foil has good wettability and controllability to the ceramic, which can conveniently control the infiltration area of ​​the solder in the end face of the vacuum switch tube ceramic tube shell, and improve the anti-voltage breakdown ability of the whole tube; stainless steel, oxygen-free copper and strengthened copper With good brazing performance, these non-ferromagnetic low-cost metals can be used to replace the expensive Kovar alloy as a vacuum switch tube metal end cap and ceramic shell one-step sealing, further reducing product costs, and ensure that the vacuum switch tube The body has non-ferromagnetic properties and can work normally in a magnetic field environment.

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