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.
Spray Coating Apparatus Having A Rotatable Workpiece Holder
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.
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.
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).
Victor Katvala 1965 graduate of James Lick High School in San jose, CA is on Classmates.com. See pictures, plan your class reunion and get caught up with Victor and other high ...