Method for recovering powdered silver-palladium braze alloy from an acrylic spray binder and rubber masking adhesive used in spray brazing is devised. The process involves agitation and dissolution of masking materials and recovery of suspended precious metal particles on a filter

Cierniak, R.

Colman, G.

De Carlo, F.

English

NASA Technical Reports Server

December 1966	 Brief 66-10631 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Silver—Palladium Braze Alloy Recovered from Masking Materials 
The problem: 
To devise an economical method for recovering 
powdered silver-palladium braze alloy from an acrylic 
spray binder and rubber masking adhesive used in 
spray brazing. 
The solution: 
A recovery process involving agitation and dissolu-
tion of the masking materials in organic solvents and 
recovery of the suspended precious metal particles on 
a filter. 
How it's done: 
The metal-powder-coated masking materials are 
stripped from the brazed structure and immersed in a 
methylene chloride bath, which is then subjected to 
ultrasonic vibration. The resultant contaminated 
metal-powder sludge is removed from the bath and 
placed in a high-speed stirrer containing a toluene-
methyl ethyl ketone mixture to dissolve the organic 
contaminants from the sludge. The suspended metal 
particles are separated from the resultant solution by
filtration under vacuum, washed on the filter with fresh 
portions of the solvent mixture, and finally dried. 
Note: 
Inquiries concerning this invention may be di-
rected to:
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B66-10631 
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: R. Cierniak, G. Colman,

and F. Decarlo of

North American Aviation, Inc.

under contract to

Marshall Space Flight Center

(M-FS- 1845) 
Category 03 
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.
https://ntrs.nasa.gov/search.jsp?R=19660000629 2020-03-11T17:45:55+00:00Z


Silver-palladium braze alloy recovered from masking materials

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