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Improved photoetching fabrication methodPhotoetching method producing well-defined lines with minimum undercutting was developed for etching coolant passages in nickel sheet. Phosphate coating is applied over conventional silver plate maskant and phosphoric acid solution is used to remove silver maskant. Phosphoric acid prevents etching of silver edges and mask has sharply-defined lines.
Document ID
19720000744
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Kistler, C. L. (Pratt and Whitney Aircraft)
Date Acquired
August 6, 2013
Publication Date
December 1, 1972
Subject Category
Fabrication Technology
Report/Patent Number
LEW-11268
Report Number: LEW-11268
Accession Number
72B10745
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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