Paintable composition for protecting metals and ceramics during

Details Paintable composition for protecting metals and ceramics during Paintable composition for protecting metals and ceramics during

1988-06-10

1990-02-06

Lieberman, Paul

Compositions: coating or plastic

Coating or plastic compositions

Silicon dioxide containing

1062861, 1062862, 1062863, 1062864, 1062865, 1062866, 1062867, 106286, 106 8, C09K 1502

Patent

active

048986186

ABSTRACT:
Paintable compositions for the formation of coatings on, for example, iron-based metals that, when dry, inhibit oxidation, decarburization and other similar reactions when the metal is heated to temperatures of about 2300 degrees F. (1300 degrees C.). The preferred binder portion of the composition, which in itself provides reasonable protection when dry, consists essentially of an aqueous colloidal silica solution together with an aqueous alkali hydroxide and oxides selected from the transition metals cobalt, chromium, iron, manganese, nickel, titanium, zinc and zirconium. The composition is benefitted by the addition of Sb.sub.2 O.sub.3. The preferred ranges of composition are described as well as certain additives to enhance performance under various conditions. These include the use of filler materials, as well as high expansion additives when the coating is to withstand temperatures recycling of the metal, and low expansion additives to enhance spallation following a single heating. The coating is useful for other metal and ceramic substrates to prevent or reduce deleterious damage to the surface at high temperatures.

REFERENCES:
patent: 2803566 (1957-08-01), Smith-Johannsen
patent: 3130061 (1964-04-01), McMahon
patent: 3647695 (1972-03-01), Hasegawa et al.

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