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Title: Coating system to permit direct brazing of ceramics

Abstract

This invention relates to a method for preparing the surface of a ceramic component that enables direct brazing using a non-active braze alloy. The present invention also relates to a method for directly brazing a ceramic component to a ceramic or metal member using this method of surface preparation, and to articles produced by using this brazing method. The ceramic can be high purity alumina. The method comprises applying a first coating of a silicon-bearing oxide material (e.g. silicon dioxide or mullite (3Al.sub.2 O.sub.3.2SiO.sub.2) to the ceramic. Next, a thin coating of active metal (e.g. Ti or V) is applied. Finally, a thicker coating of a non-active metal (e.g. Au or Cu) is applied. The coatings can be applied by physical vapor deposition (PVD). Alternatively, the active and non-active metals can be co-deposited (e.g. by sputtering a target made of mullite). After all of the coatings have been applied, the ceramic can be fired at a high temperature in a non-oxidizing environment to promote diffusion, and to enhance bonding of the coatings to the substrate. After firing, the metallized ceramic component can be brazed to other components using a conventional non-active braze alloy. Alternatively, the firing and brazing steps canmore » be combined into a single step. This process can replace the need to perform a "moly-manganese" metallization step.« less

Inventors:
 [1];  [2]
  1. (Danville, CA)
  2. (Albuquerque, NM)
Issue Date:
Research Org.:
SANDIA CORP
OSTI Identifier:
875085
Patent Number(s):
6528123
Assignee:
Sandia Corporation (Albuquerque, NM) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
coating; permit; direct; brazing; ceramics; relates; method; preparing; surface; ceramic; component; enables; non-active; braze; alloy; directly; metal; preparation; articles; produced; purity; alumina; applying; silicon-bearing; oxide; material; silicon; dioxide; mullite; 3alsub2; osub32siosub2; active; applied; finally; thicker; coatings; physical; vapor; deposition; pvd; alternatively; metals; co-deposited; sputtering; target; fired; temperature; non-oxidizing; environment; promote; diffusion; enhance; bonding; substrate; firing; metallized; brazed; components; conventional; steps; combined; single; step; process; replace; perform; moly-manganese; metallization; vapor deposition; active metal; braze alloy; /427/

Citation Formats

Cadden, Charles H., and Hosking, F. Michael. Coating system to permit direct brazing of ceramics. United States: N. p., 2003. Web.
Cadden, Charles H., & Hosking, F. Michael. Coating system to permit direct brazing of ceramics. United States.
Cadden, Charles H., and Hosking, F. Michael. Wed . "Coating system to permit direct brazing of ceramics". United States. https://www.osti.gov/servlets/purl/875085.
@article{osti_875085,
title = {Coating system to permit direct brazing of ceramics},
author = {Cadden, Charles H. and Hosking, F. Michael},
abstractNote = {This invention relates to a method for preparing the surface of a ceramic component that enables direct brazing using a non-active braze alloy. The present invention also relates to a method for directly brazing a ceramic component to a ceramic or metal member using this method of surface preparation, and to articles produced by using this brazing method. The ceramic can be high purity alumina. The method comprises applying a first coating of a silicon-bearing oxide material (e.g. silicon dioxide or mullite (3Al.sub.2 O.sub.3.2SiO.sub.2) to the ceramic. Next, a thin coating of active metal (e.g. Ti or V) is applied. Finally, a thicker coating of a non-active metal (e.g. Au or Cu) is applied. The coatings can be applied by physical vapor deposition (PVD). Alternatively, the active and non-active metals can be co-deposited (e.g. by sputtering a target made of mullite). After all of the coatings have been applied, the ceramic can be fired at a high temperature in a non-oxidizing environment to promote diffusion, and to enhance bonding of the coatings to the substrate. After firing, the metallized ceramic component can be brazed to other components using a conventional non-active braze alloy. Alternatively, the firing and brazing steps can be combined into a single step. This process can replace the need to perform a "moly-manganese" metallization step.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {1}
}

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