Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition
Patent
1987-02-02
1987-12-08
Lieberman, Paul
Compositions: coating or plastic
Coating or plastic compositions
Corrosion inhibiting coating composition
252506, 252508, 252516, C09K 1502, C09K 1532
Patent
active
047116668
ABSTRACT:
An oxidation prevention coating for graphite up to at least 1000 degrees Centigrade. Both a non-conductive and a conductive coating are described for use in coating graphite crucibles, graphite electrodes, and the like. All of the compositions utilize a binder/suspension liquid phase in an amount from about 40 to about 55 wt % of the total paintable mixture. This binder/suspension liquid phase is formed by intimately mixing colloidal silica solution, mono-aluminum phosphate solution and ethyl alcohol. The non-conducting embodiment of the invention is produced by mixing finely divided boric acid and silicon carbide with the binder/suspension liquid phase. The preferred conductive coating substitutes a mixed TiC-SiC for the SiC of the non-conductive embodiment. The resultant material is very stable (i.e., does not settle), is paintable upon the graphite, and is easily dried at or near room temperature. A few thin coats, with drying between applications, totaling only about 0.15 to about 0.23 mm prevents detrimental oxidation through several cycles to at least 1000 degrees C.
REFERENCES:
patent: 2927043 (1960-03-01), Stetson
patent: 2995453 (1961-08-01), Noble et al.
patent: 3348929 (1967-10-01), Valtschev et al.
patent: 3510347 (1970-05-01), Strater
patent: 3960592 (1976-06-01), Birchall et al.
patent: 4319924 (1982-03-01), Collins, Jr. et al.
Chapman Lloyd R.
Holcombe, Jr. Cressie E.
Kirschner Helene
Lieberman Paul
ZYP Coatings, Inc.
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