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 »
- Inventors:
-
- Danville, CA
- Albuquerque, NM
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 875085
- Patent Number(s):
- 6528123
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B23 - MACHINE TOOLS B23K - SOLDERING OR UNSOLDERING
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
- 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 = {Wed Jan 01 00:00:00 EST 2003},
month = {Wed Jan 01 00:00:00 EST 2003}
}