Composite materials associating an amorphous barium fluoride coa

Details Composite materials associating an amorphous barium fluoride coa Composite materials associating an amorphous barium fluoride coa

1985-02-25

1987-04-28

Kellogg, Arthur

Stock material or miscellaneous articles

Composite

Of quartz or glass

65 45, 65 51, 65 591, 65 601, 65 607, 501 40, 501904, 428433, 427422, C03C 3112, C03C 800

Patent

active

046614133

ABSTRACT:
The invention gives a coating with a very high vitrification rate. The resulting surface has physicochemical characteristics which are similar to those of fluoride glass. In order to achieve this result, the material constituting the fluoride glass enamel quickly crosses the temperature range between the melting point and the glossy transition temperature. Moreover, the metallic substrate temperature must be high enough to enable an active physiochemical process at the glass-metal interface which results in a correct "hooking". A "hooking" temperature is higher than one where a physical adhesion occurs, which results from Van der Waals interactions without any formation of chemical bonds at the glass-metal interface. The particular chemical reactivity of molten fluorides, which otherwise results in critical problems of corrosion, is in this case a favorable factor which generally reduces the hooking temperature to a level which is far below the glass melting temperature.

REFERENCES:
patent: 2015483 (1935-09-01), Lilienfeld
patent: 2642633 (1953-06-01), Dalton
patent: 2744034 (1956-05-01), Dalton et al.
patent: 4173459 (1979-11-01), Aulich et al.
patent: 4221825 (1980-09-01), Guerder et al.
patent: 4341873 (1982-07-01), Robinson et al.
"Etude Comparee de Verres Fluores dans les Diagrammes Ternaires Zr.F.sub.4 -BaF.sub.2 -MmF.sub.n ", by Poulain et al, 1979, Revue de Chimie Minerale, vol. 16, pp. 267-276.

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