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Title: Method and apparatus for performing in-situ vacuum-assisted metal to glass sealing

A method and apparatus for assembling and fusing glass to metal in a glass-metal electrical component is disclosed. The component includes a metallic shell formed with upper and lower cylindrical recesses connected together by longitudinal passages, a pair of metal rings and plural metal pins assembled to define electrical feed-throughs. The component parts are assembled on a fixture having a sleeve-like projection and a central mounting projection establishing concentric nesting surfaces to which the metal rings are slip-fitted in concentric alignment with each other spaced from sidewalls of the lower recess. The pins are in electrical contact with the metal rings. A glass pre-form is seated within the upper recess. The assembled structure is heated to a temperature sufficient to melt the glass pre-form which flows under gravity through the passages into the lower recess to provide an insulative seal between the metal parts. The gravity flow of glass is assisted by applying vacuum to the lower recess, ensuring that all spaces between the metal parts are filled with sealing glass without formation of bubbles.
 [1];  [2]
  1. (Dayton, OH)
  2. (Hamilton, OH)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) SNL
Patent Number(s):
US 4612029
Contract Number:
Research Org:
Country of Publication:
United States
method; apparatus; performing; in-situ; vacuum-assisted; metal; glass; sealing; assembling; fusing; glass-metal; electrical; component; disclosed; metallic; shell; formed; upper; cylindrical; recesses; connected; longitudinal; passages; pair; rings; plural; pins; assembled; define; feed-throughs; fixture; sleeve-like; projection; central; mounting; establishing; concentric; nesting; surfaces; slip-fitted; alignment; spaced; sidewalls; recess; contact; pre-form; seated; structure; heated; temperature; sufficient; melt; flows; gravity; provide; insulative; seal; flow; assisted; applying; vacuum; ensuring; spaces; filled; formation; bubbles; glass sealing; metal rings; electrical contact; temperature sufficient; sealing glass; metal electrical; gravity flow; shell formed; metallic shell; metal electric; electrical component; /65/