Title: Three-component ceramic coating for silica insulation

Abstract: Low density, fibrous, rigid, silica insulations are rendered impervious to moisture by application of a ceramic glaze coating comprising a silica barrier layer, an emissivity layer comprising a high silica glass component and an emmissivity agent and an overglaze layer comprising a high silica glass component and a borosilicate glass component. The resulting three-layered ceramic glaze laminate adhered to the fibrous silica insulation provides a moisture-impervious insulating material which exhibits a high emmissivity and is resistant to delamination and spalling at repeated cycles of thermal shock.

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Inventors: Fletcher, James C. Administrator of the National Aeronautics and Space (Mountain View, CA, US)
Pechman, Alexander (Mountain View, CA, US)
Beasley, Robert M. (Sunnyvale, CA, US)

Application Number: 482105
Filing Date: 1974-06-24
Publication_date: 1976-05-04
Assignee:
Primary Class(es): 428/215 427/376.2, 427/379, 427/380, 427/402, 428/332, 428/428, 428/450, 428/698, 428/701, 428/920, 501/66
Other Classes:
US Patent Ref:

2379507	Jul, 1945	Deyrup	117/125.
2627101	Feb, 1953	Le Clercq	117/70.
3364041	Jan, 1968	Swain et al.	106/52.
3389214	Jun, 1968	Smothers	117/125.
3458345	Jul, 1969	Fenner	117/125.
3637425	Jan, 1972	McMillan et al.	117/125.

Other Refs: 567,424

Dec, 1958	CA

Primary Examiner: Husack, Ralph
Assistant Examiner:
Attorney: McClenny; Carl O., Manning; John R., Matthews; Marvin F.