Duplex glass preforms for hermetic glass-to-metal sealing
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United States of America Patent
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Dec 29, 1987
Grant Date -
N/A
app pub date -
Oct 28, 1986
filing date -
Oct 28, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A duplex glass preform for forming hermetic glass-to-metal seals. The duplex glass preform comprises a glass infrastructure or matrix having at least one end thereof modified by the selective distribution therein of ceramic particles. The ceramic particles are selectively distributed to form a ceramic density gradient having the largest concentration of ceramic particles at the surface and gradually decreasing with depth. The duplex glass preform of the present invention has utility in forming glass-to-metal seals in hybrid metal packages containing microcircuit chips.
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