Brazing process uses vapor-deposited titanium and an aluminum-zirconium-silicon alloy to prevent formation of brittle intermetallic compounds in stainless steel and aluminum bonding. Joints formed by this process maintain their high strength, corrosion resistance, and hermetic sealing properties

Huschke, E. G., Jr.

Nord, D. B.

English

NASA Technical Reports Server

August 1966	 Brief 66-10352 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Brazing Process Provides High-Strength Bond

Between Aluminum and Stainless Steel 
The problem: 
To devise a brazing process that will produce a duc-
tile, high-strength, corrosion-resistant bond between 
stainless steel and aluminum. The bonded joint must 
be capable of service over the temperature range from 
_3200
 to +1000°F. 
The solution: 
A brazing process employing vapor-deposited ti-
tanium and an aluminum-zirconium-silicon alloy 
which prevent the formation of brittle intermetallic 
compounds between the stainless steel and aluminum. 
How it's done: 
The titanium is vapor deposited to a thickness of 
0.00075 inch on the stainless steel component. A 
0.040-inch-thick layer of the aluminum-zirconium-
silicon alloy is then vapor deposited over the titanium 
barrier. The aluminum component can be readily salt-
bath brazed to the vapor , deposited alloy surface on 
the stainless steel component. 
Notes: 
1. No brittle intermetallic compounds have been 
found to form between the titanium and stainless 
steel. Although an intermetallic compound may 
be formed between the titanium and aluminum-
zirconium-silicon alloy, it is relatively thin (less 
than 0.0005-inch thick) and ductile.
2. Joints formed by this process have maintained their 
high strength, corrosion resistance, and hermetic 
sealing properties, and showed no change in metal-
lurgical structure after fatigue testing and thermal 
cycling. 
3. This process should be useful for the brazing of 
components to produce assemblies combining the 
high strength-to-weight ratio of aluminum with 
the strength and corrosion resistance of stainless 
steel. 
4. Inquiries concerning this invention may be di-
rected to:
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B66-10352 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546. 
Source: Douglas B. Nord

and Ernst G. Huschke, Jr. 
of North American Aviation, Inc.

under contract to

Marshall Space Flight Center

(M-FS-803) 
Category 05 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Brazing process provides high-strength bond between aluminum and stainless steel

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