Carbon chalcogenide macromolecular composition and process for p

Details Carbon chalcogenide macromolecular composition and process for p Carbon chalcogenide macromolecular composition and process for p

1990-06-28

1991-09-03

Beck, Shrive

Coating processes

Coating by vapor, gas, or smoke

Carbon or carbide coating

427 451, 427 50, 427 531, C23C 1650

Patent

active

050453556

ABSTRACT:
A carbon chalcogenide macromolecular composition prepared from carbon dichalcogenide and to a process for the preparation thereof. A carbon dichalcogenide, for example, carbon disulfide, in entrained in an inert gas, and the mixture formed therefrom is passed over a hot tungsten filament wherein carbon disulfide is degraded into fragments. The fragments are then deposited onto a surface of a nonreactive substrate. The deposited fragments recombine to form the macromolecular composition. A significant characteristic of the composition is its threshold voltage above which its electrical resistance drops precipitously. This characteristic also exhibits a unique temperature dependence. Dopants may be added to the composition to reduce the electrical resistance.

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Butcher, E., Weston, J., and Gebbie, H., High-Pressure Preparation of Black Solid Carbon Disulfide (1964), J. Chem. Phys. 41,2554-2555.
Whalley, E., Structure of Bridgman's Black Carbon Disulphide, (1960), Can. J. Chem. 38, 2105-2108.
Bridgman, P. W., Freezing Parameters and Compressions of Twenty-One Substances to 50,000 KG/CM2, (1941), Pro. Amer. Acad. Arts and Sci. 74,399-424.

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