Abstract
Glasses find wide applications, among others, in process technologies, vacuum science and technology etc. because of their desired thermo-mechanical properties and chemical durability. In particular, hermetic glass-to-metal (GM) seals are required mainly as electrical feed through for various types of gas based and electron devices, chemical process industries, including for packaging of power devices. The physico-chemical properties of glasses play important role in forming hermetic sealing with metals/alloys. The properties like thermal expansion coefficient, glass transition temperature, micro hardness, chemical durability etc. can be tailored by varying the glass composition by adding multi alkali and alkaline earth metal oxides to the base glass and varying the process parameters. We have prepared different types of glasses for the fabrication of different types of hermetic seals. Some of these are i) Lead silicate (LS) glass having SiO2, Na2O, K2O, BaO and PbO for compression type GM seals with SS304/Inconel and AISI 446 alloy ii) Borosilicate (BS) glass containing SiO2.Na2O.K20. Al2O3.B2O3 for matched type GM seals with Mo/ Kovar alloy and for uptake of synthetic dyes like Rhodamine 6G, Methylene Blue, Uranyl ions in process industries and nuclear industry iii) Sodium alumino phosphate (NAP) glass with P2O5-Na2O-B2O3-BaO- PbO for matched type GM seals with low melting metals (Al,Cu)/alloys like Cu-Be.
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