Two groups of refractory metal compositions have been developed that are very useful as high temperature brazing alloys for sealing between ceramic and metal parts. Each group consists of various compositions of three selected refractory metals which, when combined, have characteristics required of good braze alloys

Erwin, G., Jr.

Lindberg, R. A.

Mckisson, R. L.

English

NASA Technical Reports Server

June 1973	 B73-10205 
NASA TECH BRIEF 
Lewis Research Center 	
-4 
NASA Tech Briefs announce now technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Braze Alloys for High Temperature Service 
in this group permit brazing in the temperature range of 
1650°C to 2000°C. The shaded area of Figure 2 illus-
trates the brazing range of such alloy compositions. 
Since the temperature-time history of the brazing 
operation varies depending upon the nature of the specific 
materials being joined and the rates at which the par-
ticular alloy composition react with the surfaces of the 
parts to be brazed, there is a high degree of flexibility 
in selecting the braze alloy compositions and in per-
forming the brazing operations. The documentation 
listed below describes how to select a braze composition 
and how to use it. 
. 
fl
Figure 1. Braze Alloy System for High Temperatures (Values in °C) 
Two groups of refractory metal compositions have 
been developed that are very useful as high temperature 
brazing alloys for sealing between ceramic and metal 
parts. Each of the two groups consists of various com-
positions of three selected refractory metals. Individ-
ually, these component refractory metals are not suit-
able as braze materials; however, combined, they have 
the required characteristics of good braze alloys. 
The first group of braze alloys consists of zirconium, 
vanadium, and columbiUm (niobium). The various re-
fractory metal compositions in this group permit brazing 
in the temperature range of 14000C to 20000C. The 
range of such alloy compositions is depicted by the 
shaded area of Figure 1. 
The second group consists of titanium, vanadium, and 
columbium. The various refractory metal compositions
120 1900  
Figure 2. Braze Alloy System for High Temperatures (Values in °C) 
Notes: 
1. Since refractory metals are subject to oxidation at 
temperatures above 1000°C, an inert gas environ-
ment must be provided for brazing with these re-
fractory metal compositions and for the subsequent 
use of the brazed joint.
(continued overleaf) 
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Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
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Brazes made from these alloy compositions have been 
tested for use in structures or components at tem-
peratures in the range of 1000°C to 1600°C although 
satisfactory use at lower temperatures can be expected. 
The following documentation may be obtained from: 
National Technical Information Service 
Springfield, Virginia 22151 
Single document price $3.00 
(or microfiche $0.95) 
Reference: NASA CR-72850(N72-75945), Eval-
uation of High Temperature Electrical Materials 
and Components 
Reference: NASA CR-1592 (N70-35822), Ther-
mal-Vacuum Testing of High Temperature Elec-
trical Components 
Reference: NASA CR-1591 (N70-34076), Ce-
ramic-Metal Bore Seal Development 
Single document price $16.75 
(or microfiche $0.95) 
Reference: NASA CR-120831 (N73-14484), 
High Temperature (1200°C) Ceramic-to-Metal 
Seal Development
Single document price $6.00 
(or microfiche $0.95) 
Reference: NASA CR-54093 (N66-35217) Bore 
Seal Technology - Topical Report 
4. Technical questions may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B73-10205 
Patent status: 
NASA has decided not to apply for a patent. 
B73-10205
Source: R. A. Lindberg 
Lewis Research Center 
and R. L. McKisson and G. Erwin, Jr., of 
Rockwell International Corp. 
under contract to 
Lewis Research Center 
(LEW-1 1374) 
Category 06


Braze alloys for high temperature service

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