# US 5,705,106 A · Heat-insulating structural carbon material and process for producing heat-insulating structural carbon material

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- Number: US 5,705,106 A
- Document ID: US5705106A
- Status: Granted
- Kind: A
- Application number: 08/464,799
- Filed: 1995-06-26
- Granted: 1998-01-06
- Earliest claimed: 1992-12-27
- Assignees: Aerospatiale Societe Nationale Industrielle; Niigrafit Research Institute
- Inventors: Sergey Anatoljevich Kolesnikov; Valery Ivanovich Kostikov; Alexander Victorovich Demin; Lyubov Semenovna Kondratova; Alexander Mikhailovich Vasiljev
- Web page: https://patentgrep.com/patent/US5705106A

## CPC

- C04B 35/83: Carbon fibres in a carbon matrix
- C04B 38/00: Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536})
- C04B 2111/00379: {the oriented elements being fibres}
- 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

## Abstract

The invention relates to a heat-insulating structural carbon material and the process for producing thereof. This heat-insulating structural material is prepared from a suspension of discrete carbon fibers in a viscoplastic liquid such as polyglycol, glycerine and petroleum oils, by molding a preform and orienting discrete filaments, followed by baking the preform and depositing pyrolytic carbon in the porous structure thereof. This heat-insulating material comprises a coke matrix, discrete carbon filaments, the coke matrix as a porous film-like structure of coke residue on said filaments, and pyrolytic carbon.

## Claims

### Claim 1

A process for producing a carbon structural thermal insulator, and comprising, preparing a suspension of discrete carbon fibers by mixing said fibers while agitating said fibers in a dispersive liquid, each of said discrete carbon fibers being made of a plurality of discrete filaments, molding a preform and orienting said discrete filaments, eliminating part of said dispersive liquid, and baking said preform in a mold, wherein said dispersive liquid is a non-water-containing viscoplastic liquid having a good wettability compared to components of said suspension, during preparation of said suspension said carbon fibers are mixed and agitated in said viscoplastic liquid until the fibers separate into said filaments such that said filaments are uniformly distributed by carbonizing said viscoplastic dispersive liquid in said preform, a porous structure of coke residue is formed on said filaments and additional rigidity is given to said preform after molding and baking of said preform by depositing pyrolytic carbon in the porous structure of said preform.

### Claim 2 (depends on 1)

A process according to claim 1, wherein said viscoplastic liquid is a polyglycol or glycerin.

### Claim 3 (depends on 1)

A process according to claim 1, wherein said viscoplastic liquid comprises a petroleum oil.

### Claim 4 (depends on 1)

A process according to claim 1, wherein said viscoplastic liquid is a mixture of pitch and a polyglycol.

### Claim 5 (depends on 1)

A process according to claim 1, orienting of the filaments is brought about by pouring beforehand the said suspension onto a surface of a filter whereon a preform is first shaped.

### Claim 6 (depends on 1)

A process according to claim 1, wherein said suspension is prepared and used in a heated state upon attaining viscosity of 50 to 500 cP.

### Claim 7 (depends on 1)

A process according to claim 1, said suspension is prepared from fibers at most 50 mm long.

### Claim 8 (depends on 1)

A process according to claim 1, wherein upon removing a portion of said viscoplastic liquid and preshaping a preform, the latter is postmolded in a mold until a solid phase/liquid phase ratio of 1:10 to 1:4 is attained.

### Claim 9 (depends on 1)

A process according to claim 1, wherein said viscoplastic liquid is a mixture of pitch and at least one petroleum oil.

### Claim 10 (depends on 1)

A process according to claim 1, wherein said viscoplastic liquid is a mixture of pitch and a mixture of petroleum oils.

### Claim 11 (depends on 1)

A process according to claim 1, wherein said viscoplastic liquid is a mixture of pitch and glycerin.