Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1997-12-19
1999-03-02
Dudash, Diana
Stock material or miscellaneous articles
Composite
Of silicon containing
427192, 427193, 427195, 427226, 4273762, 427387, 428404, 428405, 428688, 428689, 428697, 428334, B05D 506, B05D 512, B32B 3300, B32B 1800
Patent
active
058768564
ABSTRACT:
An article such as a spacecraft thermal radiator includes a substrate having a white thermal control coating thereon. The thermal control coating is formed of a matrix of a silica/silicate transformation product of a ceramic precursor, and a plurality of doped zinc oxide pigment particles distributed in the matrix. The zinc oxide pigment particles are doped with an element that forms shallow donorlike states in the zinc oxide. The coating has a solar absorptance of from about 0.2 to about 0.3 and an initial electrical resistivity of from about 1.times.10.sup.6 ohms per square to about 1.times.10.sup.8 ohms per square. The coating is stable at continuous operating temperatures of 225.degree. C., with short-term exposures of up to 800.degree. C.
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Dudash Diana
Grunebach Georgann S.
Gudmestad Terje
Hughes Electronics Corporation
Sales Michael W.
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