Glass-to-Iron Sealing

概要

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Nowadays, various types of hermetic seals made by glass-to-iron sealing technique are widely used in electronic industry. Though some theoretical and experimental studies on stresses in seals have been reported by several researchers, we have as yet very little informations as to practical sealing procedures, such as condition of preoxidation of iron or sealing atmosphere. This study was planned for finding the optimum sealing procedure and for disclosing the mechanisms of glass-to-iron bonding. The results obtained may be summerized as follows;(1) The excellent glass-to-iron bonding may be obtained by preoxidizing iron to a predetermined and controlled amount of oxidation.(2) In such seals, iron oxide is completely dissolved into glass, and glass is directly contacted with rough surface of metallic iron without showing gradual structure transition from glass to iron.(3) In seals which are made with oxide free iron, glass is contacted with smooth surface of metallic iron, and glass-to-iron bonding is not so strong as that of oxide seals.(4) In spite of these facts, oxidation of iron seems not always necessary for practical application.(5) Effects of carbon contents in iron on sealability are not clear.
社団法人日本材料学会の論文