CN105924199A - Rapid preparation method of low-cost carbon/carbon composite material - Google Patents

Abstract

The invention relates to a rapid preparation method of a low-cost carbon/carbon composite material, and belongs to the field of composite materials. The method is mainly used for reducing the preparation cycle and the cost of the high-density carbon/carbon composite material. A low-density carbon/carbon composite material is formed through compounding fixed carbon fiber fabric in fiber bundles, the carbon fiber bundles are filled with carbon particles to make macro-pores become micro-pores, and low-pressure liquid impregnation carbonization or chemical vapor infiltration and high temperature thermal treatment are carried out to obtain the high-density carbon/carbon composite material. Compared with traditional methods, the preparation method of the carbon/carbon composite material, disclosed in the invention, has the advantages of greatly shortened preparation cycle and greatly reduced preparation cost.

Description

A rapid preparation method of low-cost carbon/carbon composites

technical field

The invention relates to a rapid preparation method of a low-cost carbon/carbon composite material, which belongs to the field of composite materials.

Background technique

Carbon/carbon composites are widely used in high-temperature parts of aerospace vehicles due to their high-temperature resistance, excellent high-temperature mechanical properties, and high-temperature dimensional stability, such as ablation parts such as engine throat liners, nozzles, and aircraft ends. Traditional carbon/carbon composites can be prepared by liquid-phase or gas-phase methods. The liquid-phase method mainly uses pitch or resin as the precursor through repeated pressure impregnation, carbonization and high-temperature heat treatment, while the gas-phase method is mainly for Hydrocarbon organic gases are pyrolyzed at high temperature and deposited into carbon fiber fabrics by chemical vapor infiltration (CVI) technology. Generally, the liquid phase method can obtain higher density carbon/carbon composite materials, and the density can reach more than 2.0g/cm ³ through high pressure (pressure up to 50MPa or more); and the carbon/carbon composite materials formed by the simple CVI method The density is low, usually lower than 1.6g/cm ³ . Combining with the liquid phase method and continuing to use the high-pressure densification process to densify the carbon/carbon composite material prepared by the CVI method, a carbon/carbon composite material with a density higher than 1.8 g/cm ³ can also be obtained. In the molding process of traditional high-density carbon/carbon composite materials, the high-pressure densification process is the key to realize the filling of large pores in the material. It is precisely because of the use of multiple low-pressure liquid phase densification or long-term CVI processes and subsequent multiple liquid phase high-pressure densification processes that the production cycle of high-density (above 1.8g/cm ³ ) carbon/carbon composites It is very long, usually not less than 5 months, and due to the use of high-pressure or even ultra-high-pressure densification equipment, the manufacturing cost of materials is very high.

Contents of the invention

The technical problem solved by the invention: overcome the problems of long preparation period and high cost of existing high-density carbon/carbon composite materials, provide a rapid preparation method of low-cost carbon/carbon composite materials, and realize high-density carbon/carbon composite materials rapid and low-cost preparation.

The technical solution of the present invention: the carbon fiber fabric is shaped in advance, and then the pores in the carbon fiber bundles are filled by liquid-phase impregnated carbonization or chemical vapor deposition (CVI) method, and then the fiber bundles are filled with carbon particles, and the gap between the bundles is large. The pores are divided into micropores, and then a high-density carbon/carbon composite material is formed by liquid-phase low-pressure impregnation carbonization and high-temperature heat treatment, as follows:

(1) Use atmospheric pressure to impregnate resin or asphalt and solidify, carbonize or perform short-term chemical vapor infiltration (CVI) densification to realize the shaping of carbon fiber fabrics; during the fabric shaping process, use profiling tooling to maintain its shape and prevent fabric deformation; Obtain finalized carbon fiber fabric after completion;

(2) The shaped carbon fiber fabric is impregnated with resin or pitch under low pressure and then carbonized, or the shaped carbon fiber fabric is densified by chemical vapor infiltration (CVI) for a long time to basically fill the pores in the fiber bundle, and then perform high temperature heat treatment, Access to low-density carbon/carbon composites;

(3) Carbonaceous particles with a particle size smaller than the size of the pores between the carbon fiber bundles are mixed with a liquid carrier, and then vacuum-pressure impregnated into the pores between the fiber bundles in the low-density carbon/carbon composite material to form carbon particles filled with carbon/carbon Carbon composite materials;

(4) Continuing to use low-pressure impregnation resin or pitch for carbon particle-filled carbon/carbon composites and carbonize after curing, or continue to perform long-term chemical vapor infiltration (CVI) densification and high temperature for carbon particle-filled carbon/carbon composites Heat treatment to form a high-density carbon/carbon composite material.

The resin described in step (1), step (2) and step (4) is a resin mainly based on carbon residue after high temperature pyrolysis, including phenolic resin and furfuryl ketone resin; the pitch is an impregnating agent pitch, which can be coal One or more of base, petroleum base and synthetic asphalt.

The normal pressure impregnation process described in step (1) is the process of impregnating the fixed carbon fiber fabric in the liquid phase resin or molten pitch under normal pressure; the resin impregnation is carried out at normal temperature, and the fluidity of the resin can be obtained by The amount of solvent added is controlled; asphalt impregnation needs to be carried out in the asphalt liquid formed by heating.

The profiling frock described in step (1) is a fixed fabric shape, a mold and splint with open characteristics, and the material is graphite material, carbon/carbon composite material or metal, wherein graphite material and carbon/carbon composite material profiling frock can be It is further used in carbonization treatment and high temperature heat treatment process, while metal tooling can only be further used in carbonization treatment.

The short-term chemical vapor infiltration (CVI) densification described in step (1) refers to the process of vapor-phase pyrolytic deposition of propane, propylene, and methane on the surface of carbon fibers to form a thin layer of pyrolytic carbon matrix, wherein the densification time is relatively short, Not more than 100h; the optimal deposition time is 10h to 50h.

The low-pressure impregnation process described in step (2) is a process in which the shaped carbon fiber fabric is impregnated with liquid phase resin or asphalt under relatively low pressure, wherein the pressure is 0.1-3 MPa.

The long-term chemical vapor infiltration (CVI) densification process described in step (2) and step (4) is a longer gas phase densification process than step (1), and the deposition time is 100h to 500h.

The low-pressure impregnation process or CVI process in step (2) can be repeated 1-2 times until the density of the low-density carbon/carbon composite material is 20%-50% higher than that of the carbon fiber fabric.

The carbon particles in step (3) are solid powders mainly composed of carbon, including graphite powder, carbon black, and carbon fiber powder.

The liquid phase carrier in step (3) is a liquid phase system capable of uniformly dispersing carbonaceous particles therein, including one or more of alcohols, ketones, benzene series, and resins.

The vacuum-pressure impregnation process described in step (3) is to first vacuumize the low-density carbon/carbon composite material, and then use the liquid phase carrier containing carbonaceous particles to immerse the low-density carbon/carbon composite material and then pressurize the impregnation In the process, the pressurized pressure is 0.1-5MPa; in order to increase the filling degree of carbon particles, the vacuum-impregnation process can be repeated; after the impregnation is completed, the liquid phase carrier is removed by drying or cured by heating.

The high-temperature heat treatment process described in step (2) and step (4) is a heat treatment process with a maximum temperature not exceeding 2000°C.

The resin or pitch impregnation, curing, carbonization and high-temperature heat treatment processes described in step (4) can be carried out repeatedly until the density of the carbon/carbon composite material reaches a predetermined density or reaches a high density of 1.8g/ ^cm3 or more; wherein the last high-temperature The heat treatment temperature does not exceed 1500°C to maintain the high mechanical properties of the carbon/carbon composite.

The immersion pressure described in step (4) is in the range of 1-5 MPa.

Compared with the prior art, the present invention has beneficial effects as follows:

(1) The technical method greatly improves the densification efficiency by introducing carbon particulate matter, shortens the period for preparing high-density carbon/carbon composite materials by more than 30%, and reduces the manufacturing cost by more than 40%.

(2) This technical method can ensure sufficient filling and interface bonding in the fiber bundles by pre-forming matrix carbon in the fabric fiber bundles; at the same time, by controlling the highest heat treatment temperature and the last high-temperature heat treatment temperature, the mechanical properties of carbon/carbon composite materials can be effectively maintained. Performance is not greatly degraded by fast preparation.

(3) This technical method can be realized by low-pressure impregnation carbonization or/and chemical vapor infiltration, and abandons the high-pressure densification process required for the preparation of high-densification materials, thus avoiding high-pressure and ultra-high-pressure densification equipment, making high-density densification The cost of dense carbon/carbon composites has been reduced while process safety has been greatly increased.

detailed description

Example 1:

1) A needle-punched carbon fiber flat fabric with a density of 0.6g/cm ³ and a thickness of 30mm is used. A graphite plate with a sieve hole is used as a profiling tool, and it is fixed by graphite bolts. Then put it into the ethanol solution of phenolic resin for normal pressure impregnation. After the impregnation is completed, take it out and remove the excess resin on the surface, and then heat and cure. Carbonize the cured impregnated fabric at 900°C for 1 hour to obtain a shaped carbon fiber fabric.

2) Dip the shaped carbon fiber fabric into the phenolic resin and then pressurize to 1 MPa for pressurized liquid phase impregnation, remove excess resin on the surface after taking it out, and then heat and solidify. The cured impregnated fabric was carbonized at 900°C for 2h, and then heat-treated at 2000°C for 2h to obtain a low-density carbon/carbon composite material with a density of about 0.85g/cm ³ .

3) Use graphite powder with a particle size of 5 microns as filled carbon particles, fully disperse it in ethanol to form a suspension with a concentration of about 50g/100g, and then carry out pressure impregnation under a pressure of 3MPa to fill the graphite powder into low-density carbon/carbon composites, and then remove the ethanol solvent by heating and volatilizing. Repeat the filling process once to obtain carbon particle filled carbon/carbon composites.

4) Put the carbon particle-filled carbon/carbon composite material in the molten medium-temperature coal tar pitch, and carry out liquid-phase impregnation under a pressure of 3 MPa. After carbonization at 900°C and high-temperature heat treatment at 1800°C, liquid-phase pitch impregnation under a pressure of 4 MPa is carried out. , after carbonization at 900°C and high temperature heat treatment at 1800°C, impregnation with liquid phase pitch under a pressure of 5 MPa, and carbon/carbon composites with a density of 1.85 g/cm ³ were obtained after carbonization at 900°C and high temperature heat treatment at 1500°C.

Comparative example: the same fabric as in this example was subjected to the above (1) and (2) to obtain a low-density carbon/carbon composite material, and then the medium-temperature coal tar pitch was used as the impregnating agent for high-pressure densification and high-temperature heat treatment by traditional methods, and repeated A carbon/carbon composite material with a density of about 1.85 g/cm ³ was obtained after performing three times.

After testing, the technical method for preparing high-density carbon/carbon composite materials takes 3 months. Compared with the carbon/carbon composite material obtained by the traditional method in the comparative example, the preparation cycle and cost are reduced by more than 38% and 50% respectively, and the mechanical properties are basically the same without obvious decline.

Example 2:

1) Use a stitched carbon fiber flat fabric with a density of 0.9g/cm ³ and a thickness of 15mm. A graphite plate with a sieve hole is used as a profiling tool, and it is fixed by graphite bolts. It is then shaped using a chemical vapor deposition process. Using propane as a precursor, densify at 1000°C for 30 hours to obtain a shaped carbon fiber fabric.

2) After the shaped carbon fiber fabric is removed from the profiling tooling, the chemical vapor deposition densification is continued. Using propane as a precursor, densification at 1000°C for 300 hours, followed by high-temperature heat treatment at 1800°C, a low-density carbon/carbon composite material was obtained with a density of about 1.1g/cm ³ .

3) Use carbon black as the filling carbon particle, fully disperse it in the resin solution diluted with ethanol to form a suspension with a concentration of about 30g/100g, and then pressurize and impregnate the carbon black at a pressure of 5MPa Filled into a low-density carbon/carbon composite material, and then volatilized by heating to remove the ethanol solvent and cure the resin. Repeat the filling process once to obtain carbon particle filled carbon/carbon composites.

4) Put carbon particles filled carbon/carbon composites in phenolic resin, impregnate in liquid phase under a pressure of 3MPa, after carbonization at 900°C and heat treatment at a high temperature of 1800°C, then resin impregnation under a pressure of 4MPa, after 900°C After carbonization and high-temperature heat treatment at 2000°C, resin impregnation under 5MPa pressure was carried out, and carbon/carbon composite materials with a density of 1.89g/ ^cm3 were obtained after carbonization at 900°C and high-temperature heat treatment at 1500°C.

Comparative example: the same fabric as in this example was subjected to the above (1) and (2) to obtain a low-density carbon/carbon composite material, and then the medium-temperature coal tar pitch was used as the impregnating agent to perform high-pressure densification and high-temperature heat treatment by traditional methods, and repeated A carbon/carbon composite material with a density of about 1.90 g/cm ³ was obtained after performing three times.

After testing, the technical method for preparing high-density carbon/carbon composite materials takes 2.5 months. Compared with the carbon/carbon composite material obtained by the traditional method in the comparative example, the preparation cycle and cost are reduced by more than 45% and 45% respectively, and the mechanical properties are basically the same without obvious decline.

Example 3:

1) Use a three-way carbon fiber block fabric with a density of 1.1g/cm ³ and a thickness of 50mm. The metal groove with sieve holes on the wall is used as the profiling tool, and there is no obvious gap between the fabric and the tool. Then put it into the ethanol solution of phenolic resin for normal pressure impregnation. After the impregnation is completed, remove the excess resin on the surface, and then heat and cure. Carbonize the cured impregnated fabric at 900°C for 3 hours to obtain a shaped carbon fiber fabric.

2) After the shaped carbon fiber fabric is removed from the profiling tooling, the chemical vapor deposition densification is continued. Using propylene as a precursor, densification at 1000°C for 50 hours, followed by high temperature heat treatment at 1800°C, a low-density carbon/carbon composite material was obtained with a density of about 1.31g/cm ³ .

3) Use the carbon fiber powder obtained by grinding (with a particle size of about 10 microns) as filled carbon particles, fully disperse it in toluene to form a suspension with a concentration of about 25g/100g, and then pressurize it at a pressure of 5MPa Impregnation, filling carbon fiber particles into low-density carbon/carbon composites, and then removing the toluene solvent by heating and evaporating. Repeat the filling process once to obtain carbon particle filled carbon/carbon composites.

4) Put carbon particle-filled carbon/carbon composites in molten medium-temperature petroleum asphalt, and carry out liquid-phase impregnation under a pressure of 3 MPa. After carbonization at 900°C and high-temperature heat treatment at 2000°C, pitch impregnation under a pressure of 5 MPa was carried out, and a carbon/carbon composite material with a density of 1.89g/ ^cm3 was obtained after carbonization at 900°C and high-temperature heat treatment at 1500°C.

Comparative example: the same fabric as in this example was subjected to the above (1) and (2) to obtain a low-density carbon/carbon composite material, and then the medium-temperature coal tar pitch was used as the impregnating agent to perform high-pressure densification and high-temperature heat treatment by traditional methods, and repeated A carbon/carbon composite with a density of about 1.95 g/cm ³ was obtained after four passes.

After testing, the technical method for preparing high-density carbon/carbon composite materials takes 3 months. Compared with the carbon/carbon composite material obtained by the traditional method in the comparative example, the preparation cycle and cost are reduced by more than 45% and 60% respectively, and the mechanical properties decrease by no more than 5%, and there is no obvious decrease.

Example 4:

1) Use a stitched carbon fiber flat fabric with a density of 0.9g/cm ³ and a thickness of 15mm. A carbon/carbon composite plate with mesh holes is used as a profiling tool, which is fixed by carbon/carbon composite bolts. Then put it into the molten medium temperature asphalt for impregnation under normal pressure. After impregnation, take out and remove excess pitch on the surface, and carbonize at 900°C for 2 hours to obtain a shaped carbon fiber fabric.

2) After the shaped carbon fiber fabric is removed from the profiling tooling, the chemical vapor deposition densification is continued. Using methane as a precursor, densification at 1000°C for 50 hours, followed by high-temperature heat treatment at 2000°C, a low-density carbon/carbon composite material with a density of about 1.18g/cm ³ was obtained.

3) Use artificial graphite powder with a particle size of about 5 microns as the filled carbon particles, fully disperse it in the phenolic resin to form a suspension with a concentration of about 30g/100g, and use ethanol to control its fluidity under the pressure of 5MPa The low-density carbon/carbon composite material is impregnated under pressure, and the carbon particles are filled between the low-density carbon/carbon composite fiber bundles, and then the ethanol is removed by heating and volatilization, and the resin is cured. Repeat the filling process once to obtain carbon particle filled carbon/carbon composites.

4) Put carbon particles filled carbon/carbon composites in phenolic resin, impregnate in liquid phase under a pressure of 3MPa, after carbonization at 900°C and heat treatment at a high temperature of 1800°C, then resin impregnation under a pressure of 4MPa, after 900°C After carbonization and high-temperature heat treatment at 2000°C, resin impregnation under 5MPa pressure is carried out, and after carbonization at 900°C and high-temperature heat treatment at 1800°C, resin impregnation under 5MPa pressure, carbonization at 900°C and high-temperature heat treatment at 1500°C are carried out to obtain a density of 1.92g/cm ³ carbon/carbon composite.

Comparative example: the same fabric as in this example was subjected to the above (1) and (2) to obtain a low-density carbon/carbon composite material, and then the medium-temperature coal tar pitch was used as the impregnating agent to perform high-pressure densification and high-temperature heat treatment by traditional methods, and repeated A carbon/carbon composite with a density of about 1.96 g/cm ³ was obtained after four passes.

After testing, the technical method for preparing high-density carbon/carbon composite materials takes 3.3 months. Compared with the carbon/carbon composite material obtained by the traditional method in the comparative example, the preparation cycle and cost are reduced by more than 42% and 55% respectively, and the mechanical properties are basically the same without obvious decline.

Example 5:

1) A needle-punched carbon fiber flat fabric with a density of 0.6g/cm ³ and a thickness of 30mm is used. A graphite material plate with a sieve hole is used as a profiling tool, and it is fixed by graphite material bolts. Then put it into the molten medium temperature asphalt for impregnation under normal pressure. After impregnation, take out and remove excess pitch on the surface, and carbonize at 900°C for 2 hours to obtain a shaped carbon fiber fabric.

2) After the shaped carbon fiber fabric is removed from the profiling tooling, the chemical vapor deposition densification is continued. Using methane as a precursor, densification at 1000°C for 80 hours, followed by high-temperature heat treatment at 1800°C, a low-density carbon/carbon composite material was obtained with a density of about 0.86g/cm ³ .

3) Use carbon fiber powder with a particle size of 3 microns to 20 microns as filled carbon particles, fully disperse it in the ethanol solution with phenolic resin to form a suspension with a concentration of about 30g/100g, and then under the condition of a pressure of 5MPa The low-density carbon/carbon composite is impregnated under pressure, and the carbon particles are filled between the fiber bundles of the low-density carbon/carbon composite, and then the ethanol is removed by heating and volatilization, and the resin is cured. The filling process was repeated twice to obtain carbon particle-filled carbon/carbon composites.

4) Place the carbon/carbon composite material filled with carbon particles in molten medium-temperature asphalt, impregnate in liquid phase under a pressure of 3MPa, carbonize at 900°C, and then impregnate with resin under a pressure of 4MPa, carbonize at 900°C and carbonize at 2000°C After high temperature heat treatment, resin impregnation under 5MPa pressure, carbonization at 900°C and high temperature heat treatment at 1800°C, resin impregnation at 5MPa pressure, carbonization at 900°C and high temperature heat treatment at 1500°C, to obtain a density of 1.83g/cm ³ carbon/carbon composites.

Comparative example: the same fabric as in this example was subjected to the above (1) and (2) to obtain a low-density carbon/carbon composite material, and then the medium-temperature coal tar pitch was used as the impregnating agent to perform high-pressure densification and high-temperature heat treatment by traditional methods, and repeated A carbon/carbon composite with a density of about 1.86 g/cm ³ was obtained after four passes.

After testing, the preparation period of the high-density carbon/carbon composite material by this method is 3.5 months. Compared with the carbon/carbon composite material obtained by the traditional method in the comparative example, the preparation cycle and cost are reduced by more than 40% and 52% respectively, and the mechanical properties are basically the same without obvious decline.

Claims (14)

1. the fast preparation method of a low cost carbon/carbon compound material, it is characterised in that step includes:

(1) use normal pressure impregnating resin or pitch and solidify, carbonization treatment or carry out short time chemical vapor infiltration (CVI) the densified sizing realizing carbon fibre fabric thoroughly；Fabric type-approval process is protected by profiling fixture Hold its profile, prevent fabric distortion；Sizing carbon fibre fabric is obtained after completing；

(2) carbonization treatment is carried out after sizing carbon fibre fabric being used low pressure impregnating resin or pitch and solidifying, Maybe sizing carbon fibre fabric is carried out for a long time chemical vapor infiltration (CVI) density, by fibre bundle inner pore It is substantially filled with, then carries out high-temperature heat treatment, it is thus achieved that low-density carbon/carbon compound material；

(3) by granularity, less than between carbon fiber bundle, the carbonaceous particle of pore-size is by mixing with liquid phase carrier, so Final vacuum-impregnating by pressure, in the hole of fiber interfascicular in low-density carbon/carbon compound material, forms carbon granule and fills out Fill carbon/carbon compound material；

(4) after carbon granule being filled carbon/carbon compound material continuation employing low pressure impregnating resin or pitch and solidifying Carry out carbonization treatment, or carbon granule filling carbon/carbon compound material is proceeded long-time chemical vapor infiltration (CVI) densified and high-temperature heat treatment, forms high-compactness carbon/carbon compound material.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its It is characterised by: step (1), step (2) and step (4) described resin are for residual with carbon after high temperature pyrolysis It is left main resin, including phenolic resin, furfural acetone resin；Described pitch is dipping agent bitumen, can be coal One or more in base, petroleum base and synthetic asphalts.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its Be characterised by: the normal pressure dipping process described in step (1), for by carbon fibre fabric fixing for setting tooling in The process impregnated in liquid-phase resin or melted pitch under normal pressure；Resin dipping is carried out at normal temperatures, resin Mobility controlled by the number of solvent adding amount；Bituminizing then needs at the asphaltic liquid being thermally formed Body is carried out.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its Be characterised by: step (1) described profiling fixture is fixed fabric shape, have opening character feature mould, Clamping plate, material is graphite material, carbon/carbon compound material or metal, wherein graphite material and carbon/carbon compound material Profiling fixture can further apply carbonization treatment and high-temperature heat treatment process, and metal frock is only capable of further For carbonization treatment.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its It is characterised by: carry out that chemical vapor infiltration (CVI) is densified to be referred to third the short time described in step (1) Alkane, propylene, methane gas phase pyrolytic deposition form the process of thin layer pyrocarbon matrix to carbon fiber surface, wherein The densified time is shorter, less than 100h；Optimizing sedimentation time is 10h～50h.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its It is characterised by: the low pressure dipping process described in step (2) is that the carbon fibre fabric after shaping adds in relatively low Carrying out in the case of pressure impregnating liquid-phase resin or the process of pitch, wherein moulding pressure is 0.1～3MPa.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its It is characterised by: step (2) and step (4) is described carries out chemical vapor infiltration (CVI) density for a long time Process is the gas phase density process more longer than step (1) time, and sedimentation time is 100h～500h.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its It is characterised by: step (2) described low pressure dipping process or CVI process can repeat 1～2 time, directly Density to low-density carbon/carbon compound material increases by 20%～50% than carbon fibre fabric.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its Be characterised by: step (3) described carbon granule is the solid powder with carbon as main component, including graphite powder, Carbon black, carbon fiber powder.

The fast preparation method of a kind of low cost carbon/carbon compound material the most according to claim 1, its It is characterised by: the liquid phase carrier described in step (3) is the liquid phase that can be uniformly dispersed therein by carbonaceous particle System, including one or more in alcohols, ketone, benzene homologues, resin.

The fast preparation method of 11. a kind of low cost carbon/carbon compound materials according to claim 1, its It is characterised by: the vacuum described in step (3)-impregnating by pressure process is for first to enter low-density carbon/carbon compound material Row vacuumizes, and then will pressurize after low-density carbon/carbon compound material submergence with the liquid phase carrier containing carbonaceous particle The process of dipping, moulding pressure is 0.1～5MPa；Can be by vacuum-dipping for improving the compactedness of carbon granule Process repeats；After having impregnated, liquid phase carrier is removed or by being heating and curing by being dried.

The fast preparation method of 12. a kind of low cost carbon/carbon compound materials according to claim 1, its It is characterised by: the high-temperature heat treatment process described in step (2) and step (4) is less than 2000 DEG C for the highest Heat treatment process.

The fast preparation method of 13. a kind of low cost carbon/carbon compound materials according to claim 1, its It is characterised by: resin or bituminizing, solidification, carbonization and high-temperature heat treatment process described in step (4) can To be repeated, until the density of carbon/carbon compound material reaches predetermined density or reaches high-compactness 1.8g/cm³ Above；Wherein last high-temperature heat treatment temperature is less than 1500 DEG C, to keep carbon/carbon compound material relatively High mechanical property.

14. the fast preparation method of a kind of low cost carbon/carbon compound material according to claim 1, its It is characterised by: the impregnation pressure described in step (4) is in the range of 1～5MPa.