Carbon-carbon bearing plate precursor and preparation method and application thereof

Abstract

The invention provides a carbon-carbon bearing plate precursor as well as a preparation method and application thereof, and relates to the technical field of materials. The preparation method of the carbon-carbon bearing plate precursor provided by the invention comprises the following steps: mixing a thermosetting phenolic resin adhesive, carbon fiber powder, graphite powder and a surface modifier, and drying to prepare a precursor filler; and sequentially spreading the precursor filler and laying the net tire layer on the net tire layer, repeating the process until the design density of the product is reached, and then performing hot pressing treatment to obtain the carbon-carbon bearing plate precursor. According to the preparation method, a needling compounding method is not used, layering and cracking abnormity caused by repeated needling or insufficient needling compounding of the net tire is reduced, the density of the precursor stage is improved, the density of the carbon-carbon bearing plate precursor prepared through the preparation method can reach 1.52 g / cm < 3 > after pressing, the porosity is low, the subsequent densification process is shortened, and the production cost is reduced. And the production cost of the product is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, in particular to a carbon-carbon bearing plate precursor and a preparation method and application thereof. BACKGROUND

[0002] Currently, a traditional carbon-carbon composite material precursor is made by using a flat plate needling process, raw materials are carbon fiber web and composite weftless cloth made of carbon fiber filaments and the web, and on this basis, the web and the composite weftless cloth are combined in a certain way to form a unit layer, the unit layers are stacked at a certain angle, and a flat plate needling machine is used for composite needling to realize the production of the carbon-carbon composite material precursor.

[0003] Due to the density limitation of the raw materials and the requirement of the flat plate needling process, the density of the traditional carbon-carbon composite material precursor is limited, and the density is only 0.4-0.5 g / cm 3 , which puts high requirements on subsequent densification by gas phase method or liquid phase method. At the same time, due to multiple rounds of gas deposition or liquid densification, the delivery time of the current carbon-carbon composite material products with high density (>1.40 g / cm 3 ) is long and the product consistency is poor.

[0004] The carbon-carbon composite material precursor is made by using a flat plate needling process, the bottom unit layer is subjected to a large needling density and high compression, causing the internal density of the precursor to be gradiently distributed, and the unevenly distributed density of the precursor in the subsequent densification process further affects the overall density of the product, causing uneven stress distribution in the product, resulting in abnormal deformation, warping, etc.

[0005] The traditional carbon-carbon composite material precursor is made by repeatedly stacking and needling the unit layer formed by the carbon fiber web and the carbon fiber weftless cloth, the carbon fiber weftless cloth is composed of the web and the carbon fiber filaments, the carbon fiber filaments are bent after needling, and the high strength advantage of the carbon fiber filaments cannot be effectively utilized, and the longitudinal carbon filaments formed after needling are few, the bonding strength between the unit layers is low, and the product is prone to delamination and cracking.

[0006] Therefore, the present application is proposed. SUMMARY

[0007] The first object of the present application is to provide a preparation method of a carbon-carbon bearing plate precursor, and the prepared carbon-carbon bearing plate precursor has high filling rate, high density, high density uniformity, low mechanical stress and other properties, so as to improve the insufficient bending resistance, low service life and insufficient bulk density of the current carbon-carbon bearing products, and promote the realization of the domestic substitution of semiconductor carbon-carbon bearing plates.

[0008] The second object of the present application is to provide a carbon-carbon bearing plate precursor.

[0009] The third object of the present application is to provide an application of the above-mentioned carbon-carbon bearing plate precursor in the preparation of a carbon-carbon bearing plate.

[0010] In order to achieve the above-mentioned objects, the following technical solutions are adopted: In a first aspect, the present application provides a preparation method of a carbon-carbon bearing plate precursor, comprising the following steps: a. mixing a thermosetting phenolic resin adhesive, carbon fiber powder, graphite powder and a surface modifier, and drying to obtain a precursor filler; b. sequentially spreading the precursor filler and the laid web layer on the web layer, and repeating the process until the designed density of the product is reached, and then preparing a carbon-carbon bearing plate precursor after heat pressing treatment; The mass ratio of the thermosetting phenolic resin adhesive, carbon fiber powder, graphite powder and surface modifier is (1.2-1.8):(0.5-0.8):(0.2-0.5):(0.08-0.12); The surface modifier comprises water, alcohol, KH560 and KH550, and the mass ratio of water, alcohol, KH560 (silane coupling agent 560) and KH550 (silane coupling agent 550) is 1:(8-10):(2-3):(0.1-0.5).

[0011] As a further technical solution, the mesh number of the carbon fiber powder is 50-500 mesh; The mesh number of the graphite powder is 500-1000 mesh.

[0012] As a further technical solution, the web layer comprises at least one web.

[0013] As a further technical solution, the preparation method of the web is as follows: The chopped carbon filaments are prepared into a fiber web using a roller-type carding machine with a doffer and a random roller, and then the fiber web is fed into a pre-needling machine for needle punching reinforcement to obtain the web.

[0014] As a further technical solution, the length of the chopped carbon filaments is 40-120 mm, and the mass proportion of the chopped carbon filaments with a length less than 60 mm is less than 50%, and the mass proportion of the chopped carbon filaments with a length greater than 100 mm is not less than 10%; Preferably, the length of the chopped carbon filaments is 70-80 mm.

[0015] As a further technical solution, the grammage of the web is 95-105 g / m 2 .

[0016] As a further technical solution, the laying method of the web is 90° turning for each layer.

[0017] As a further technical solution, the temperature of the hot-pressing treatment is 170-230 DEG C, the time is 90-180 min, and the compression ratio is 1.2-1.5.

[0018] In a second aspect, the application provides a carbon-carbon bearing plate precursor prepared by the preparation method.

[0019] In a third aspect, the application provides the use of the carbon-carbon bearing plate precursor in the preparation of a carbon-carbon bearing plate.

[0020] Compared with the prior art, the application has the following beneficial effects: The preparation method of the carbon-carbon composite bearing plate precursor provided by the application does not use needle punching compounding, reduces the delamination and cracking caused by repeated needle punching or insufficient needle punching compounding of the tire, and improves the density at the precursor stage. The density of the carbon-carbon bearing plate precursor prepared by the preparation method of the application can reach 1.52 g / cm 3 after pressing, the porosity is low, the subsequent densification process is reduced, and the product production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 The structure of the carbon-carbon bearing plate precursor of the application is shown in the figure. DETAILED DESCRIPTION

[0023] The embodiments of the application will be described in detail below in combination with the embodiments and examples, but those skilled in the art will understand that the following embodiments and examples are only used to illustrate the application and should not be regarded as limiting the scope of the application. Based on the examples in the application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the application. If the specific conditions are not specified, the conventional conditions or the conditions recommended by the manufacturer are used. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0024] In a first aspect, the application provides a preparation method of a carbon-carbon bearing plate precursor, comprising the following steps: a. Mix thermosetting phenolic resin binder, carbon fiber powder, graphite powder and surface modifier, and prepare a precursor filler after drying; b. Sprinkle the precursor filler and the overlaying scrim layer on the scrim layer in turn, and repeat the process (i.e. sprinkle the precursor filler and the overlaying scrim layer on the scrim layer in turn) until the designed density of the product is reached, and then prepare the carbon-carbon bearing plate precursor after heat pressing.

[0025] The mass ratio of the thermosetting phenolic resin binder, carbon fiber powder, graphite powder and surface modifier may be, for example, but is not limited to, 1.2:0.8:0.2:0.12, 1.8:0.5:0.5:0.08 or 1.3:0.7:0.3:0.1. The phenolic resin binder in the present application can be a solid powder or a liquid. The addition ratio of the carbon fiber powder is adjusted according to its particle size. If the particle size of the carbon fiber powder is small, its addition amount can be appropriately increased. If the particle size of the carbon fiber powder is large, its addition amount needs to be appropriately reduced.

[0026] The surface modifier includes water, alcohol, KH560 and KH550. The mass ratio of water, alcohol, KH560 and KH550 may be, for example, but is not limited to, 1:8:3:0.1, 1:10:2:0.5 or 1:8.6:2.2:0.3.

[0027] The surface modifier can improve the interfacial bonding performance and dispersion performance between the powder filler and the scrim, improve the bonding performance between the powder phenolic resin and the recycled carbon fiber powder and graphite powder in the filler, reduce the agglomeration of the filler, and achieve uniform mixing of the filler. The KH550 silane coupling agent is used to achieve uniform mixing of the resin, graphite powder and other powdered materials, improve the chemical bonding between the carbon fiber system and the thermosetting phenolic resin system, the KH560 has good reaction performance with the hydroxyl groups existing in the epoxy system, the carbon fiber and the phenolic resin, which helps to reduce interface defects, and the combination of the two silane coupling agents helps to improve the crosslinking degree after curing, form a silane system crosslinking network, and improve the interlaminar shear performance, bending resistance and impact resistance of the composite material.

[0028] The preparation method of the carbon-carbon composite bearing plate precursor provided by the present application does not use needle punching composite method, reduces the delamination and cracking abnormalities caused by repeated needle punching or insufficient needle punching of the scrim, and improves the density of the precursor stage; the ratio of the scrim and the filler can be adjusted to realize the flexibility of the carbon-carbon bearing plate precursor process; recycled carbon fiber powder can be used for filling to reduce the generation of solid waste of carbon fiber products and achieve green environmental protection; the density of the prepared carbon-carbon bearing plate precursor after pressing can reach 1.52 g / cm 3 , the porosity is low, the subsequent densification process is reduced, and the production cost of the product is reduced.

[0029] In some alternative embodiments, the carbon fiber powder has a mesh size of 50-500 mesh. The graphite powder has a mesh size of 500-1000 mesh.

[0030] In some alternative embodiments, the surface modifier has a pH of 5-6, preferably 5.5.

[0031] The web layer is composed of one or more web layer stacks, and in some alternative embodiments, the web layer comprises at least one web. For example, the web layer can be composed of only one web, or can be composed of multiple webs.

[0032] In some alternative embodiments, the web is prepared by the following method: The chopped carbon filaments are prepared into a fiber web using a roller carding machine with a doffer and a randomizer roller, and then the fiber web is fed into a pre-needling machine for needle punching reinforcement to obtain the web.

[0033] The use of a roller carding machine with a roller and a randomizer roller in the web production stage further improves the carding degree of the web, improves the tensile strength and isotropic degree of the web, and reduces the mechanical property difference in the CD and MD directions of the web.

[0034] In some alternative embodiments, the length of the chopped carbon filaments is 40-120 mm, and the mass proportion of chopped carbon filaments with a length of less than 60 mm is less than 50%, and the mass proportion of chopped carbon filaments with a length of more than 100 mm is not less than 10%. Preferably, the length of the chopped carbon filaments is 70-80 mm, for example, but not limited to, 70 mm, 72 mm, 74 mm, 76 mm, 78 mm, or 80 mm.

[0035] The use of a mixture of carbon fiber chopped filaments of different lengths imparts sufficient strength, processability, and durability to the fiber web, the web, and the carbon-carbon thermal insulation hard felt, and to some extent, the carbon filaments with a fiber length of <60 mm can be replaced by carbon fiber preforms, soft felt edges, and other materials after being broken and opened, thereby reducing production costs.

[0036] In some alternative embodiments, the grammage of the web can be, for example, but not limited to, 95 g / m 2 , 100 g / m 2 , or 105 g / m 2 .

[0037] In some alternative embodiments, the web is laid in a 90° turning manner for each layer to eliminate the mechanical property difference in the transverse and longitudinal directions caused by the anisotropy of the web, and to achieve uniform mechanical properties in all directions.

[0038] In some alternative embodiments, the temperature of the hot-pressing process can be, but is not limited to, 170℃, 200℃ or 230℃, the time can be, but is not limited to, 90min, 100min or 180min, and the compression ratio can be, but is not limited to, 1.2, 1.35 or 1.5.

[0039] In a second aspect, the present application provides a carbon-carbon bearing plate precursor prepared by the above method.

[0040] The carbon-carbon bearing plate precursor prepared by the method has high filling rate, high density, high density uniformity (density distribution in the precursor is uniform, and the density distribution deviation is less than 3%), low mechanical stress and other properties, which helps to improve the insufficient bending resistance, low service life and insufficient bulk density of current carbon-carbon bearing products, and promotes the realization of domestic substitution of semiconductor carbon-carbon bearing plates.

[0041] In a third aspect, the present application provides the use of the above carbon-carbon bearing plate precursor in the preparation of a carbon-carbon bearing plate.

[0042] The carbon-carbon bearing plate precursor provided by the present application can be prepared into a carbon-carbon bearing plate after subsequent carbonization, densification and high-temperature processes.

[0043] The present application will be further described by specific examples and comparative examples, but it should be understood that these examples are only for a more detailed description and should not be understood as limiting the present application in any form.

[0044] It should be noted that in the following examples and comparative examples, the hot-setting phenolic resin adhesive has a product number of 8405, and the carbon residue rate of the hot-setting phenolic resin adhesive is 40% (after the resin is cross-linked by heat setting, the weight percentage of the substance remaining after decomposition under the protection of an atmosphere at 800℃ to the original substance is 40%).

[0045] Example 1 A method for preparing a carbon-carbon bearing plate precursor includes the following steps: Short cutting of carbon fibers: the present application uses mixed short-cut carbon filaments with a length of 40-120mm, the mass proportion of short-cut carbon filaments with a short cutting length of less than 60mm is less than 50%, and the mass proportion of short-cut carbon filaments with a short cutting length of more than 100mm is not less than 10%; Carding: the mixed short-cut carbon filaments after short cutting are fed into a roller carding machine with a doffer and a randomizer through a transmission apron, the short-cut carbon filaments are repeatedly opened and carded through a working roller, a cylinder and a doffer, and the fiber web is further randomized through a randomizer to form a fiber web, and the fiber web is cross-laid using a reciprocating laying machine; Needle punching reinforcement: the fiber web after cross-laying is fed into a pre-needling machine through a feeding device to reinforce the fiber web by needle punching, to form a web with high isotropy (MD: CD = 1.3:1), and the web has a grammage of 100±5 g / m 2 ; Cutting and preparing: the reinforced web is cut according to the product blank size and density, and the web is prepared according to the required number and weight of the web for the carbon-carbon bearing plate; Filler mixing: deionized water, alcohol and silicon-based coupling agent are mixed in a specific ratio (the ratio is deionized water: anhydrous alcohol: KH560: KH550 = 1:8.6:2.2:0.3), the pH value is adjusted (the pH value is 5.5), and the surface modifier is prepared after stirring for 30-60 min; Using a stirrer, hot-set phenolic resin adhesive (carbon residue 40%), recycled carbon fiber powder (80-500 mesh), graphite powder (500-1000 mesh) and surface modifier (mixing ratio 1.3:0.7:0.3:0.1) are added in sequence and stirred at a frequency of 35 Hz for 25 min, and then placed in a 130℃ oven for baking for 60 min to prepare the precursor filler.

[0046] Laying and hot pressing: a single layer is placed under the screen mesh of a high-frequency vibrating screen, the precursor filler is uniformly spread on the surface of the web using the high-frequency vibrating screen, and after the filler is completely spread, a single layer of web is placed on the top surface of the filler again, and the process is repeated until the designed density of the product is reached, and the web is laid in a 90° direction for each layer; The completed carbon-carbon bearing plate precursor is placed in a press for hot pressing, the compression ratio is set to 1.35, the hot pressing temperature is 220℃, and the holding time is 100 min, and then the carbon-carbon bearing plate precursor is prepared, as shown in Figure 1 .

[0047] Example 2 A method for preparing a carbon-carbon bearing plate precursor, comprising the following steps: Carbon fiber chopping: the mixed chopped carbon filaments used in the present application have a length of 40-120 mm, the mass proportion of the chopped carbon filaments with a length less than 60 mm is less than 50%, and the mass proportion of the chopped carbon filaments with a length greater than 100 mm is not less than 10%; Carding: the mixed chopped carbon filaments after chopping are fed into a roller carding machine with a doffer and a randomizer through a transmission apron, the chopped carbon filaments are repeatedly opened and carded by a working roller, a cylinder and a doffer, and the fiber web is further randomized by a randomizer to form a fiber web, and the fiber web is cross-laid using a reciprocating laying machine; Needle punching reinforcement: the fiber web after cross-laying is fed into a pre-needling machine through a feeding device to perform needle punching reinforcement on the fiber web, to form a web with high isotropy (MD: CD = 1.3: 1), and the web has a grammage of 100 ± 5 g / m 2 ; Cutting and preparing: the reinforced web is cut according to the product blank size and density, and the web is prepared according to the required number and weight of the web for the carbon-carbon bearing plate; Filler mixing: deionized water, alcohol and silicon-based coupling agent are mixed in a specific ratio (the ratio is deionized water: anhydrous alcohol: KH560: KH550 = 1:8:2:0.1), the pH value is adjusted (the pH value is 5.5), and the surface modifier is prepared after stirring for 30-60 min; The mixer is used to add, in sequence, the thermosetting phenolic resin adhesive (40% residual carbon), the recycled carbon fiber powder (80-500 mesh), the graphite powder (500-1000 mesh) and the surface modifier (the mixing ratio is 1.2:0.8:0.2:0.12) at a frequency of 35 Hz for 25 min, and then the precursor filler is prepared by baking in a 130℃ oven for 60 min.

[0048] Laying and hot pressing: the single-layer or multi-layer web is placed under the screen of the high-frequency vibrating screen, the precursor filler is uniformly spread on the surface of the web by using the high-frequency vibrating screen, the single-layer or multi-layer web is placed again on the top surface of the filler after the filler is completely spread, and the process is repeated until the designed density of the product is reached, and the web is laid in a 90° direction for each layer; The completed carbon-carbon bearing plate precursor is placed in the press for hot pressing, the compression ratio is set to 1.2, the hot pressing temperature is 170℃, and the holding time is 180 min, and then the carbon-carbon bearing plate precursor is prepared.

[0049] Example 3 A method for preparing a carbon-carbon bearing plate precursor, comprising the following steps: Carbon fiber cutting: the present application uses a short carbon fiber with a length of 70-80 mm; Carding: the mixed short carbon fiber after cutting is fed into the roller carding machine with a transmission leather apron through a conveying apron, the short carbon fiber is repeatedly opened and carded through the working roller, the cylinder and the doffer, and the fiber web is further randomized through the randomizer to form a fiber web, and the cross-laying machine is used to cross-lay the fiber web; Needle punching reinforcement: the fiber web after cross-laying is fed into a pre-needling machine through a feeding device to perform needle punching reinforcement on the fiber web, to form a web with high isotropy (MD: CD = 1.3: 1), and the web has a grammage of 100 ± 5 g / m 2 ; Cutting and preparing materials: cutting the finished reinforced tire according to the product blank size and density, and preparing materials according to the required number and weight of the tire for the carbon-carbon bearing plate; Filling mixture: mixing deionized water, alcohol, and silicon-based coupling agent in a specific ratio (the ratio of deionized water: anhydrous alcohol: KH560: KH550 is 1:10:3:0.5), adjusting the pH value (the pH value is 5.5), and stirring for 30-60 min to prepare the surface modifier; Using a blender, add the thermosetting phenolic resin adhesive (carbon residue 40%), recycled carbon fiber powder (80-500 mesh), graphite powder (500-1000 mesh), and surface modifier (mixing ratio 1.8:0.5:0.5:0.08) in sequence, stir at a frequency of 35 Hz for 25 min, and then place in a 130°C oven for 60 min to prepare the precursor filler.

[0050] Laying and hot pressing: using single or multiple layers of tire under the high-frequency vibrating screen mesh, using the high-frequency vibrating screen to evenly spread the precursor filler on the surface of the tire, and then placing another single or multiple layers of tire on the top surface of the filler, and repeating the process until the designed density is reached. The tire laying method is to turn 90° for each layer. Place the completed carbon-carbon bearing plate precursor in the press and heat press, with a compression ratio of 1.5 and a hot pressing temperature of 230°C for 90 min, to prepare the carbon-carbon bearing plate precursor.

[0051] Comparative Example 1 The difference from Example 1 is that only KH550 coupling agent is used to prepare the surface modifier (i.e. all KH560 coupling agent is replaced by KH550 coupling agent, and the ratio of water, alcohol and KH550 in the surface modifier is 1:8.6:2.5). The inventors found that this surface modifier can achieve uniform mixing of carbon fiber powder, graphite powder and powdered phenolic resin, but the curing crosslinking degree of phenolic resin is reduced due to the presence of amino groups during the curing process, the resin hygroscopicity increases, and the precursor appears to be 1-1.5 mm thicker than the designed thickness during the curing process. A large amount of small molecule substances are released during carbonization, further causing the precursor thickness to expand, resulting in a lower density than the designed density after carbonization. The density of the precursor during the curing stage is 1.32-1.38 g / cm 3 , and the density after carbonization is 1.05-1.10 g / cm 3 .

[0052] Comparative Example 2 The difference from example 1 is that only KH560 coupling agent is used to prepare the surface modifier (i.e. all KH550 coupling agent is replaced by KH560 coupling agent, and the ratio of water, alcohol and KH560 in the surface modifier is 1:8.6:2.5). The inventor has found that the surface modifier is insufficient to infiltrate the surface of the powdered resin, carbon fiber powder and graphite powder, resulting in uneven mixing of the materials, and the phenomenon of small granular groups of materials, and the phenomenon of uneven surface of the carbon plate after carbonization of the precursor, and the product density deviation is >5%; Comparative example 3 The difference from example 1 is that no surface modifier is added.

[0053] The inventor has found that, due to the absence of the surface modifier, the precursor filler is not uniformly mixed, and the carbon fiber powder, graphite powder and powdered phenolic resin are aggregated, and the filler is not uniformly mixed, and the material is not uniformly spread during the spreading process, and the precursor is carbonized after heat pressing and curing, and the product surface is bulged and layered, and the product density distribution is uneven, resulting in "S" deformation, and the product density deviation is >10%.

[0054] Comparative example 4 The traditional scheme is used to prepare the precursor, and the precursor is prepared by using 300g / m 2 Woven tire + two 50g / m 2 flat needle to make a precursor, and the saturated impregnation pressing scheme is used in the curing stage, and the resin plate density after curing and pressing is 1.10-1.15g / cm 3 , and the product density after the first carbonization process is 0.95-1.05g / cm 3 .

[0055] The present application uses a woven tire to fill the pores of the precursor after pressing with different particle size fillers, and the porosity of the precursors in examples 1-3 is <10.6% after pressing, the density deviation in the precursor is <3%, and the density is >1.5g / cm 3 (the density of example 1 is 1.52g / cm 3 ); and it is not easy to warp and deform.

[0056] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preparing a carbon-carbon bearing plate precursor, characterized in that, Includes the following steps: a. A precursor filler is prepared by mixing thermosetting phenolic resin binder, carbon fiber powder, graphite powder and surface modifier, and then drying the mixture. b. The precursor filler is sequentially spread on the mesh layer and the mesh layer is covered, and this process is repeated until the design density of the product is reached. Then, the carbon-carbon bearing plate precursor is prepared by hot pressing. The mass ratio of the thermosetting phenolic resin adhesive, carbon fiber powder, graphite powder, and surface modifier is (1.2-1.8):(0.5-0.8):(0.2-0.5):(0.08-0.12). The surface modifier includes water, alcohol, KH560 and KH550, and the mass ratio of water, alcohol, KH560 and KH550 is 1:(8-10):(2-3):(0.1-0.5).

2. The preparation method according to claim 1, characterized in that, The carbon fiber powder has a mesh size of 50-500 mesh; The graphite powder has a mesh size of 500-1000 mesh.

3. The preparation method according to claim 1, characterized in that, The mesh layer comprises at least one layer of mesh.

4. The preparation method according to claim 3, characterized in that, The method for preparing the mesh tire is as follows: Short carbon filaments are processed into a fiber web using a roller carding machine with doffers and randomized rollers. The fiber web is then fed into a pre-needling machine for needle punching reinforcement to obtain the web core.

5. The preparation method according to claim 4, characterized in that, The length of the chopped carbon filament is 40-120mm, and the mass proportion of chopped carbon filament with a length of less than 60mm is less than 50%, while the mass proportion of chopped carbon filament with a chopped length of more than 100mm is not less than 10%. Preferably, the length of the chopped carbon wire is 70-80 mm.

6. The preparation method according to claim 3, characterized in that, The mesh tire has a weight of 95-105 g / m². 2 .

7. The preparation method according to claim 3, characterized in that, The mesh is laid out by rotating each layer 90°.

8. The preparation method according to claim 1, characterized in that, The hot pressing treatment is performed at a temperature of 170-230℃ for 90-180 minutes, with a compression ratio of 1.2-1.

5.

9. A carbon-carbon bearing plate precursor, characterized in that, It is prepared by the preparation method according to any one of claims 1-8.

10. The application of the carbon-carbon bearing plate precursor according to claim 9 in the preparation of carbon-carbon bearing plates.

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