Transient liquid phase ceramic bonding

Patent · Sat Jan 01 00:00:00 EST 1994

OSTI ID:869639

Glaeser, Andreas M ^[1]

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1. Berkeley, CA

Ceramics are joined to themselves or to metals using a transient liquid phase method employing three layers, one of which is a refractory metal, ceramic or alloy. The refractory layer is placed between two metal layers, each of which has a lower melting point than the refractory layer. The three layers are pressed between the two articles to be bonded to form an assembly. The assembly is heated to a bonding temperature at which the refractory layer remains solid, but the two metal layers melt to form a liquid. The refractory layer reacts with the surrounding liquid and a single solid bonding layer is eventually formed. The layers may be designed to react completely with each other and form refractory intermetallic bonding layers. Impurities incorporated into the refractory metal may react with the metal layers to form refractory compounds. Another method for joining ceramic articles employs a ceramic interlayer sandwiched between two metal layers. In alternative embodiments, the metal layers may include sublayers. A method is also provided for joining two ceramic articles using a single interlayer. An alternate bonding method provides a refractory-metal oxide interlayer placed adjacent to a strong oxide former. Aluminum or aluminum alloys are joined together using metal interlayers.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• DOE Contract Number: AC03-76SF00098
• Assignee: Regents of University of California (Oakland, CA)
• Patent Number(s): US 5372298
• OSTI ID: 869639
• Country of Publication: United States
• Language: English

Related Subjects

transient
liquid
phase
ceramic
bonding
ceramics
joined
metals
method
employing
layers
refractory
metal
alloy
layer
placed
melting
pressed
articles
bonded
form
assembly
heated
temperature
remains
solid
melt
reacts
surrounding
single
eventually
formed
designed
react
completely
intermetallic
impurities
incorporated
compounds
joining
employs
interlayer
sandwiched
alternative
embodiments
sublayers
provided
alternate
provides
refractory-metal
oxide
adjacent
strong
former
aluminum
alloys
interlayers
alternative embodiments
placed adjacent
refractory layer
ceramic article
metal layers
refractory metal
metal layer
metal oxide
liquid phase
alternative embodiment
aluminum alloy
method provides
ceramic articles
method provide
aluminum alloys
remains solid
transient liquid
bonding temperature
joining ceramic
metallic bond
oxide interlayer
method employing
bonding layer
phase ceramic
layer sandwiched
surrounding liquid
method employ
phase method
oxide form
refractory compound
refractory compounds
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