High temperature inorganic paint

Details High temperature inorganic paint High temperature inorganic paint

1992-12-01

1994-05-10

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Alkali metal silicate containing

106430, 106444, 106439, 106903, 1062861, 252500, C09D 102, C09D 524, C09D 533

Patent

active

053104226

ABSTRACT:
An inorganic paint suitable for harsh environments, and particularly suitable as a thermal control coating for spacecraft, includes a mixture of 50% or more dry weight barium titanate (BaTiO.sub.3) pigment powder with a binder of an alkali metal silicate such as potassium silicate K.sub.2 SiO.sub.3 or sodium silicate Na.sub.2 SiO.sub.3. Instead of alkali metal silicate binder, a glass frit may be used, which when fused binds the pigment to the substrate. The coefficient of thermal expansion of the pigment is about 12.times.10.sup.-6 /.degree.C. The coefficient of thermal expansion of the paint is moved toward the coefficient of expansion of the substrate by addition of a filler consisting of magnesia to increase the paint's coefficient of expansion, or alumina and/or silica to decrease the paint's coefficient of expansion. The paint survives harsh environments, ultraviolet radiation and a fluence of charged particles, while maintaining a low solar absorptance and high thermal emittance. Ceria may be added to the paint to reduce formation of color centers. The paint may be extruded onto a vaporizable transfer medium to form a tape.

REFERENCES:
patent: 2998328 (1961-08-01), Munger et al.
patent: 3222197 (1965-12-01), Sibert et al.
patent: 4173485 (1979-11-01), Woditsch et al.
patent: 5066330 (1991-11-01), Holcombe, Jr. et al.
patent: 5164003 (1992-11-01), Bosco et al.
"Application of a New Detector For Cathodeluminescense Measurement in the Wavelength Range to 1.8 mu M", by Koschek et al, published at pp. 199-204 of the journal Scanning, vol. 7, No. 4, 1985 (W. Germ.).
"Asymmetric Transmission Through a Photorefractive Crystal of Barium Titanate" by McDonald et al., published by pp. 146-150 of vol. 50, No. 3 of Optics Communications, Jun. 1, 1984 (Netherlands).
"High Luminous Efficiency Thin-Film Electroluminescent Devices with Low Resistivity Insulating Materials", by Hsu et al., published at pp. 1509-1512 of vol. 71, No. 3 of the Journal of Applied Physics, Feb. 1, 1992 (USA).

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