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Title: Process for forming unusually strong joints between metals and ceramics by brazing at temperatures that do not exceed 750/sup 0/C

Abstract

This invention is a process for joining metals to ceramics to form very strong bonds using low brazing temperature, i.e., less than 750/sup 0/C, and particularly for joining nodular cast iron to partially stabilized zirconia. The process provides that the ceramic be coated with an active metal, such as titanium, that can form an intermetallic with a low melting point brazing alloy such as 60Ag-30Cu-10Sn. The nodular cast iron is coated with a noncarbon containing metal, such as copper, to prevent carbon in the nodular cast iron from dissolving in the brazing alloy. These coated surfaces can be brazed together with the brazing alloy between at less than 750/sup 0/C to form a very strong joint. An even stronger bond can be formed if a transition piece is used between the metal and ceramic. It is preferred for the transition piece to have a coefficient of thermal expansion compatible with the coefficient of thermal expansion of the ceramic, such as titanium.

Inventors:
; ;
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
5386447
Application Number:
ON: DE85017731
Assignee:
Dept. of Energy
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRAZED JOINTS; CERAMICS; BRAZING; IRON; METALS; ZIRCONIUM OXIDES; BRAZING ALLOYS; SURFACE COATING; ALLOYS; CHALCOGENIDES; DEPOSITION; ELEMENTS; FABRICATION; JOINING; JOINTS; OXIDES; OXYGEN COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; WELDED JOINTS; WELDING; ZIRCONIUM COMPOUNDS; 360101* - Metals & Alloys- Preparation & Fabrication; 360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Hammond, J P, David, S A, and Woodhouse, J J. Process for forming unusually strong joints between metals and ceramics by brazing at temperatures that do not exceed 750/sup 0/C. United States: N. p., 1984. Web.
Hammond, J P, David, S A, & Woodhouse, J J. Process for forming unusually strong joints between metals and ceramics by brazing at temperatures that do not exceed 750/sup 0/C. United States.
Hammond, J P, David, S A, and Woodhouse, J J. Tue . "Process for forming unusually strong joints between metals and ceramics by brazing at temperatures that do not exceed 750/sup 0/C". United States.
@article{osti_5386447,
title = {Process for forming unusually strong joints between metals and ceramics by brazing at temperatures that do not exceed 750/sup 0/C},
author = {Hammond, J P and David, S A and Woodhouse, J J},
abstractNote = {This invention is a process for joining metals to ceramics to form very strong bonds using low brazing temperature, i.e., less than 750/sup 0/C, and particularly for joining nodular cast iron to partially stabilized zirconia. The process provides that the ceramic be coated with an active metal, such as titanium, that can form an intermetallic with a low melting point brazing alloy such as 60Ag-30Cu-10Sn. The nodular cast iron is coated with a noncarbon containing metal, such as copper, to prevent carbon in the nodular cast iron from dissolving in the brazing alloy. These coated surfaces can be brazed together with the brazing alloy between at less than 750/sup 0/C to form a very strong joint. An even stronger bond can be formed if a transition piece is used between the metal and ceramic. It is preferred for the transition piece to have a coefficient of thermal expansion compatible with the coefficient of thermal expansion of the ceramic, such as titanium.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {12}
}