Coating processes – Electrical product produced – Metallic compound coating
Patent
1990-08-15
1991-07-23
Bell, Janyce
Coating processes
Electrical product produced
Metallic compound coating
427106, 427108, 4271261, 427165, 427226, 427380, B05D 512, B05D 302
Patent
active
050342460
ABSTRACT:
A method is disclosed for forming a tungsten oxide film on a substrate by applying an alkyl amine tungstate compound thereon and removing at least a portion of the alkyl amine tungstate compound to form a tungsten oxide film.
In a preferred embodiment, a solution of alkyl amine tungstate compound is formed in a solvent to uniformly apply the alkyl amine tungstate compound; the solvent is removed by evaporation thereby forming a deposit; the deposit is heated for a time and at a temperature sufficient to at least partially pyrolyze the alkyl amine tungstate compound.
The alkyl amine tungstate compound desirably may be selected from the group consisting of bis (di-n-octylammonium) tetratungstate, and di (n-octadecylammonium) tetratungstate. Preferably, bis (di-n-octylammonium) tetratungstate is used.
The invention also provides tungsten oxide films which include suboxides of tungsten oxides (WO.sub.3); which have an average ratio of oxygen atoms to tungsten atoms equal to or less than 3:1; which are denser than films produced from currently known MOD precursor compounds; which have a color gradient, that is, regions of different color; and wherein the regions of color are electrochromic.
REFERENCES:
patent: 3617341 (1971-11-01), Fetterman
patent: 4347265 (1982-08-01), Washo
patent: 4960618 (1990-10-01), Tanitso et al.
Engelken et al, "Growth of Tungsten Selenide Films . . . ((NH.sub.4).sub.2 WSe.sub.4)", Mat. Res. Bull., vol. 20 (1985), pp. 1173-1179.
Yamanaka et al, "The Electrochromic Properties of . . . Organic Tungsten Compound", Jap J. Appl Phys, vol. 20 (4) (1981), pp. 307-308.
Unuma et al, "Preparation of Transparent Amorphous Tungsten Trioxide . . . Dip Coating Method", Jour. Mat. Sci. Letters 5 (1986), pp. 1248-1250.
Boyer et al, "New Preparation of . . . W.sub.6 O.sub.19 ", C.R. Acad. Sci. Paris, 281 (Series C, 1975), pp. 59-62 (English Translation of the Original French version).
Habib Mohammad A.
Maheswari Shyam P.
Mance Andrew M.
Micheli Adolph L.
Bell Janyce
Fekete Douglas D.
General Motors Corporation
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