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SEALED GLASS BUSHINGS *
Author(s) -
Grigoribff W. W.,
Lampman C. M.
Publication year - 1943
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1943.tb15193.x
Subject(s) - bushing , gasket , materials science , metallurgy , borosilicate glass , welding , composite material , soldering , seal (emblem) , brass , annealing (glass) , alloy , copper , art , visual arts
A bstract Glass bushings with sealed‐in metal inserts have been developed to fulfill the need for hermetically sealed electrical apparatus. A special lead‐borosilicate glass called GE 1075 and a 42% nickel‐iron alloy, both of which have like thermal expansion characteristics, will produce a matched seal. The forming operation consists of melting the glass electrolytically, casting into preheated molds of graphite or iron which have the metal inserts in place, annealing from 500° to 350°C., and cutting off the stub end of the bushing. The finished bushings are fastened to the apparatus by welding or soldering, which eliminates the use of gaskets. A detailed description of the construction, forming process, and testing procedure is given.