# US 5,352,486 A · Method for producing carbon material coated with carbon film and the use of carbon material

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- Number: US 5,352,486 A
- Document ID: US5352486A
- Status: Granted
- Kind: A
- Application number: 07/872,400
- Filed: 1992-04-23
- Granted: 1994-10-04
- Earliest claimed: 1991-08-23
- Assignees: Toyo Tanso Co., Ltd.
- Inventors: Takashi Matsumoto; Hiroaki Ogura; Osamu Okada; Shinsuke Goda
- Web page: https://patentgrep.com/patent/US5352486A

## CPC

- C04B 35/524: obtained from polymer precursors, e.g. glass-like carbon material
- B22D 11/059: Mould materials or platings
- C04B 35/521: {obtained by impregnation of carbon products with a carbonisable material}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)

## Abstract

There is provided a method for producing a carbon material coated with carbon film comprising the steps of dissolving an aromatic polyamide imide resin in an organic solvent to obtain a solution, applying this solution to a carbon material or impregnating the carbon material with the solution, curing the material at 300 to 400%, and carbonizing and/or graphitizing the material by baking under non-oxidizing atmosphere. There is also provided a carbon material coated with an amorphous carbon film which is a product of thermal decomposition of aromatic polyamide imide.

## Claims

### Claim 1

A method for producing a carbon material coated with carbon film comprising the steps of:
dissolving an aromatic polyamide imide resin in an organic solvent to obtain a solution having a concentration of the aromatic polyamide imide resin of 10 to 50%, said aromatic polyamide imide resin being a resin of low molecular weight of about 10 to 100 in number of monomers; applying said solution to the carbon material or impregnating the carbon material with said solution, said carbon material selected from the group consisting of isotropic carbon, isotropic graphite material and material of a carbon/carbon composite; curing said material at 300.degree. C. to 400.degree. C.; and carbonizing and/or graphitizing said material by baking under a non-oxidizing atmosphere.