Nickel for Glass Sealing

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  • 硝子封着用ニッケル
  • ガラス フウ チャクヨウ ニッケル

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Abstract

Glass nickel sealing in spite of the relatively large difference in expansion coefficient between them is made possible by the process of producing a bubble layer around the nickel wire, which minimizes the strains in the glass and protects the sealed part from cracking. In this experiment two important properties of rickel for glass sealing were examined: Namely, the character of producing bubbles and the wettability of glass to nickel were investigated by measuring the bubble size produced on the sealed part and the contact area of glass spread on the nickel plate in heating at various temperatures. The results obtained are as follows: (1) The wettability of glass to nickel depends on the surface condition of the metal. The mechanically polished specimen was very wettable. (2) In the specimens with several alloying elements added, manganese-added alloy was very wettable, while silicon-added specimen, was hard to be wetted. In the other specimens containing aluminum, chromium and magnesium, no effect of additions on the wettability of glass was observed. (3) The capacity of producing a good bubble layer depends on the melting condition of nickel. The specimen incompletely deoxidized and degassed showed good result, while the fully treated specimens produced no bubble at the part of sealing. (4) The gassy nickel containing relatively much carbon and incompletely degassed in molten state showed remarkable hardening (Hv about 300) by low temperature annealing and good resistance to atmospheric oxidation in heating at 700∼900°C temperature range.

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