Brazing of alumina with Ti-Cu-0 dilute ceramics
The joining of ceramics using active metal braze alloys (such as Ag-Cu-Ti mixtures) produces a layered structure of interfacial reaction products, often including one or more `dilute ceramic` compounds. These phases have composition M{sub a}X{sub b} where M is one or more metallic elements, X is a light element such as carbon, oxygen, nitrogen, or boron, and a {much_gt} b. Replacing the active metal used in ceramic joints with one of these dilute ceramics would result in a joint without residual metal at the interface. The closer thermal expansion match with the substrate and the higher melting temperature of the dilute ceramic should reduce residual stresses and may improve high-temperature stability and strength. The work reported here is an initial study of the brazing of Al{sub 2}O{sub 3} using the dilute ceramics Ti{sub 4}Cu{sub 2}O and Ti{sub 3}Cu{sub 3}O. This is the first attempt to join ceramics directly with these transitional compounds as the interlayers. Recent efforts have made the ternary Ti-Cu-O phases available in bulk form and have provided information about their properties. Both solid slices and powders of the dilute ceramics were used to join alumina slabs to one another. Interlayer-substrate reactions must still occur in order to form a strong joint. This investigation concentrates on joint fabrication and on identification of reaction products and interface morphology using x-ray diffraction (XRD) and electron probe microanalysis (EPMA). The observed reaction products are discussed in light of the previously determined phase stabilities for the Ti-Cu-Al-O system.
- OSTI ID:
- 115549
- Report Number(s):
- CONF-9404233-; TRN: 95:002927-0131
- Resource Relation:
- Conference: 75. American Welding Society (AWS) annual meeting, Philadelphia, PA (United States), 10-15 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of 75th Diamond anniversary American Welding Society annual meeting; PB: 273 p.
- Country of Publication:
- United States
- Language:
- English
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