Variations of phases and microstructure of reaction products in the interface of Al[sub 2]O[sub 3]/Ag-Cu-Ti joint system with heat-treatment

Journal Article · Wed Nov 30 23:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90071-X· OSTI ID:6989878

Byun, W; Kim, H ^[1]; Yun, M ^[2]

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1. KAIST, Taejon (Korea, Republic of). Dept. of Inorganic Materials Science and Engineering
2. Korea Electrotechnology Research Inst., Changwon (Korea, Republic of)

Ceramic-to-metal (C/M) joining is of particular importance because of physical and economic limitations that restrict the size and complexity of ceramic components. The active filler metal method is one of the C/M joining techniques and involves the use of elements with a strong affinity for O[sub 2], e.g., Ti or Zr. Active metal elements, typically Ti, have been shown to be effective in wetting various oxides. In the Ag-Cu-Ti/Al[sub 2]O[sub 3] system the primary concern has been focused on the formation of Ti-contained phases as a result of chemical reaction between Al[sub 2]O[sub 3] and the Ti-containing brazing alloy. Previous studies suggested that Ti in brazing alloy reacts with the Al[sub 2]O[sub 3] ceramic surface to form compounds such as TiO. These compounds act as a transition layer between the Al[sub 2]O[sub 3] and the brazing alloy. The chemical reaction products at the C/M interface are important because they influence the mechanical strength of the joint. These products are affected by the composition of the brazing alloy and the process conditions such as the heat-treatment temperature and time. Consequently, microstructural studies of interfacial reaction products must be carried out to understand the relationships between the structure and the properties of the joint. The purpose of the present study is to investigate the phase evolution and the microstructural characteristics of chemical reaction products formed in the interface between the commercial alumina and the Ti-containing brazing filler metal at various heat-treatment conditions.

• OSTI ID: 6989878
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:11; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360602 -- Other Materials-- Structure & Phase Studies
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COPPER ALLOYS
ELEMENTS
FABRICATION
FILLER METALS
INTERFACES
JOINING
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
SILVER ALLOYS
SILVER BASE ALLOYS
TITANIUM
TRANSITION ELEMENTS