Aluminum oxide coating provides surface which will not be wetted by brazing alloy and which stops metallic diffusion welding of tooling materials to part being produced. This method eliminates loss of tooling materials and parts from braze wetting and allows fall-apart disassembly of tooling after brazing

Carter, P. D.

Layton, R. E.

Stratton, F. W.

English

NASA Technical Reports Server

Retort Cap
Upper Slipsheet
Tooling Honeycomb
Perforated Skin
Tooling Honeycomb
Retort Bottom
Weld Closure 
Honeycomb 
Skin 
Lower Slipsheet 
.
October 1973	 B73-10358 
NASA TECH BRIEF 
Langley Research Center
	 4r 
NASA Tech Briefs announcenew 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. 
New Concept in Brazing Metallic -Honeycomb Panels 
A new concept has been devised for the brazing of 
acoustically-treated, metallic honeycomb-panel assem-
blies. It consists of the application of an aluminum 
oxide coating sprayed on tooling materials. This coating 
provides a surface which will not be wetted by the 
brazing alloy and which stops metallic diffusion welding 
of tooling materials to the part being produced. 
The illustration shows how the reusable tooling 
honeycomb and aluminum oxide-coated slipsheets are 
used on both sides of the part assembly to wick the 
brazing alloy out of any perforations. 
Braze alloy is applied to the part pieces which are 
then installed in the retort. The retort is sealed to effect 
control of the atmosphere surrounding the braze prod-
uct. Pressure is applied to the exterior of the retort to 
maintain preload intimacy of the part pieces. The retort 
assembly is heated sufficiently to braze the part and 
then is cooled. The retort seal is broken, and the part 
is removed. 
This method eliminates the loss of tooling materials
and parts from braze wetting and allows fall-apart 
disassembly of the tooling after brazing. 
Note: 
No further documentation is available. Specific ques-
tions, however, may be directed to: 
Technology Utilization Officer 
Langley Research Center 
Mail Stop 139-A 
Hampton, Virginia 23665 
Reference: B73-10358 
Patent status: 
NASA has decided not to apply for a patent. 
Source: Paul D. Carter, Robert E. Layton, 
and Francis W. Stratton of
The Boeing Company 
under contract to
Langley Research Center 
(LAR-10957) 
Category 08 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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New concept in brazing metallic honeycomb panels

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