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Glass Coats For Hot Isostatic PressingSurface voids sealed from pressurizing gas. Coating technique enables healing of surface defects by hot isostatic pressing (HIP). Internal pores readily closed by HIP, but surface voids like cracks and pores in contact with pressurizing gas not healed. Applied to casting or weldment as thick slurry of two glass powders: one melts at temperature slightly lower than used for HIP, and another melts at higher temperature. For example, powder is glass of 75 percent SiO2 and 25 percent Na2O, while other powder SiO2. Liquid component of slurry fugitive organic binder; for example, mixture of cellulose acetate and acetone. Easy to apply, separates voids from surrounding gas, would not react with metal part under treatment, and easy to remove after pressing.
Document ID
19890000297
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Ecer, Gunes M.
(Rockwell International Corp.)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 6
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
MFS-29501
Accession Number
89B10297
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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