Victor W Katvala

US Patent:

7767305, Aug 3, 2010

Filed:

Jan 14, 2004

Appl. No.:

10/758611

Inventors:

David A. Stewart - Santa Cruz CA, US
Daniel B. Leiser - San Jose CA, US
Robert R. DiFiore - Fremont CA, US
Victor W. Katvala - San Jose CA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (NASA) - Washington DC

International Classification:

B32B 7/02
B32B 27/32
B32B 17/06
B32B 9/00

US Classification:

428428, 428408, 428426, 428446, 428704

Abstract:

Tantalum-based ceramics are suitable for use in thermal protection systems. These composite structures have high efficiency surfaces (low catalytic efficiency and high emittance), thereby reducing heat flux to a spacecraft during planetary re-entry. These ceramics contain tantalum disilicide, molybdenum disilicide and borosilicate glass. The components are milled, along with a processing aid, then applied to a surface of a porous substrate, such as a fibrous silica or carbon substrate. Following application, the coating is then sintered on the substrate. The composite structure is substantially impervious to hot gas penetration and capable of surviving high heat fluxes at temperatures approaching 3000 F. and above.

US Patent:

43122922, Jan 26, 1982

Filed:

Sep 22, 1978

Appl. No.:

5/945040

Inventors:

Marnell Smith - San Jose CA
Victor W. Katvala - San Jose CA
Ernest E. Porter - Saratoga CA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

B05C 1100
B05C 1302

US Classification:

118320

Abstract:

A spray coating apparatus is provided for rotating a workpiece relative to a spray station to obtain a uniform coating of the workpiece. In a typical example, the workpiece comprises a ceramic tile which is to be coated with a ceramic coating and the tile is to be used as a reusable component of the thermal protection system for a space shuttle. The apparatus for rotating the workpiece includes a base support having a first rotatable stage for rotation in the horizontal plane and a second rotatable stage for rotation in a second plane inclined at an angle, such as 45 degrees, to the horizontal plane and the workpiece is supported on this second stage. Thus the workpiece is rotatable in both of two planes of rotation. The workpiece support is detachable from the first rotatable stage and the workpiece is readily detachable from the workpiece support to facilitate off loading of the spray coated workpiece. The workpiece holder includes a spray guard extending around the periphery of the workpiece to shield that surface of the workpiece where no coating is desired.

US Patent:

50790820, Jan 7, 1992

Filed:

Jan 18, 1989

Appl. No.:

7/298149

Inventors:

Daniel B. Leiser - San Jose CA
Marnell Smith - San Jose CA
Rex A. Churchward - Mountain View CA
Victor W. Katvala - San Jose CA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

B32B 514

US Classification:

4283077

Abstract:

A porous body of fibrous, low density silica-based insulation material is at least in part impregnated with a reactive boron oxide containing borosilicate glass frit, a silicon tetraboride fluxing agent and a molybdenum silicide emittance agent. The glass frit, fluxing agent and emittance agent are separately milled to reduce their particle size, then mixed together to produce a slurry in ethanol. The slurry is then applied to the insulation material and sintered to produce the porous body.

US Patent:

40937712, Jun 6, 1978

Filed:

Oct 29, 1976

Appl. No.:

5/736910

Inventors:

James C. Administrator of the National Aeronautics and Space Fletcher
Howard E. Goldstein - Saratoga CA
Daniel B. Leiser - San Francisco CA
Victor W. Katvala - San Francisco CA

International Classification:

B32B 518
B32B 1706

US Classification:

428312

Abstract:

The present invention relates to reaction cured glass and glass coatings prepared by reacting a compound selected from the group of substances consisting of silicon tetraboride, silicon hexaboride, other boron silicides, boron and mixtures thereof with a reactive glass frit composed of a porous high silica borosilicate glass and boron oxide. The glassy composites of the present invention are useful as coatings on low density fibrous porous silica insulations used as heat shields and for articles such as reaction vessels that are subjected to high temperatures with rapid heating and cooling and that require resistance to temperature and repeated thermal shock at temperatures up to about 1482. degree. C (2700PF).