A white porcelain enamel coating was developed for application to high temperature metallic alloy substrates on spacecraft The coating consists of an optically pacifying zirconia pigment, a Lithia-sarcoma-silica frit, and an inorganic pigment dispersant The coating is fired at 1000 to 1 150 C to form the enamel. The coating has a solar absorptance (αs )of 0 22 and a total normal emittance of 0. 82 for a 0. 017 cm thick coating and exhibits a Δαs = 0. 04 after 1000 equivalent solar hours of ultraviolet radiation The coating exhibits excellent adhesion, cleavability, and integrity and is thermal shock resistant to 900 C. Capability to coat large panels has been demonstrated by successful coating of 30 cm x 30 cm Hastelloy X alloy panels.
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