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Title: Transient liquid phase ceramic bonding

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 togethermore » using metal interlayers.« less
Inventors:
 [1]
  1. (Berkeley, CA)
Issue Date:
OSTI Identifier:
869639
Assignee:
Regents of University of California (Oakland, CA) LBNL
Patent Number(s):
US 5372298
Contract Number:
AC03-76SF00098
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
Country of Publication:
United States
Language:
English
Subject:
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; /228/