Carbon-graphite material for brushes of electric machines and me

Details Carbon-graphite material for brushes of electric machines and me Carbon-graphite material for brushes of electric machines and me

1977-02-22

1978-10-10

Guynn, Herbert B.

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

252508, 252509, 252511, 427113, 427114, 427380, 427385R, 427407R, 428408, H01B 106, H01R 3926

Patent

active

041195728

ABSTRACT:
A carbon graphite material for brushes of electric machines contains ultraphosphates of metals which are sealed by film-forming polymers. The material is impregnated in a mixture of a metal chloride with an aqueous solution of orthophosphoric acid and heat treated to form ultraphosphates of metals evenly distributed throughout the entire volume of the material. The material is then impregnated in a film-forming polymer resin solution, which enhances the contact characteristics of the material, and again heat treated till the resin is fully polymerized. As a result, the ultraphosphates which have formed earlier in the material, are sealed, thus becoming hydrolytically stable; at the same time, the contact characteristics of the material improve generally, the material becoming highly wear resistant, capable of operating within a wide range of temperatures, pressures and humidity.

REFERENCES:
patent: 2685539 (1954-08-01), Woodburn et al.
patent: 2685540 (1954-08-01), Woodburn et al.
patent: 2685541 (1954-08-01), Woodburn et al.
patent: 2909452 (1959-10-01), Parriss et al.
patent: 3342627 (1967-09-01), Paxton et al.
patent: 3713882 (1973-01-01), DeBrunner et al.
patent: 3996408 (1976-12-01), Fridman et al.
Noller, Chemistry of Organic Compounds, 3rd Edition, 1965, p. 603.
The Condensed Chemical Dictionary, Sixth Edition, pub. 1961, Reinhold Pub. Co., New York, p. 545.

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