Carbon fiber graphite composite board and preparation method thereof

Abstract

The invention belongs to the technical field of composite boards, and particularly relates to a carbon fiber graphite composite board and a preparation method thereof.The composite board is prepared from short fibers, pitch coke powder and modified pitch; the short fibers are made of waste felt and carbon felt leftover materials; the pitch coke powder is prepared from large-particle pitch, the carbon content of the pitch coke powder is greater than or equal to 98%, the ash content is less than or equal to 0.5%, and the sulfur content is less than or equal to 0.5%; the ash content of the modified asphalt is less than or equal to 0.3%, and the softening point is 100-110 DEG C; according to the invention, waste residues and leftover materials are fully utilized, and the advantages of light weight, tensile strength and good breaking strength of carbon fibers are fully utilized to transform an original pure graphite product, so that the new product has the advantages of small density, convenience in disassembly and assembly, difficulty in damage and long service life, meanwhile, wastes are utilized, the production cost is reduced, and the benefit is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite plates, and relates to a composite material. A structural member prepared by using the material and method can be applied to negative electrodes or other high-temperature sintering fields, and specifically relates to a carbon fiber graphite composite plate and a preparation method thereof. Background Art

[0002] At present, in some high-temperature sintering furnaces, negative electrode box plate graphitization furnaces and other high-temperature environments, the structural parts and boxes used for support and partition are basically graphite plates or carbon plates. However, during use, it is found that graphite plates and carbon plates are heavy, have poor toughness, are difficult to carry and assemble, are easy to bump, and will crack after a few uses, resulting in high equipment maintenance costs and high product production costs. Summary of the invention

[0003] Purpose of the invention: To provide a carbon fiber graphite composite plate and a preparation method thereof, by utilizing waste carbon fiber felt and scraps to solve the shortcomings of graphite plates or carbon plates such as few uses, short life and high cost, to provide a structural part that is easy to assemble and has a long service life, thereby reducing production costs and improving efficiency.

[0004] Technical solution: A carbon fiber graphite composite plate, the composite plate is made of short fibers, asphalt coke powder and modified asphalt

[0005] The short fibers are made of waste felt and carbon felt scraps;

[0006] The asphalt coke powder is made of large-particle asphalt, and the carbon content of the asphalt coke powder is ≥ 98%, the ash content is ≤ 0.5%, and the sulfur content is ≤ 0.5%;

[0007] The ash content of the modified asphalt is ≤0.3% and the softening point is 100-110°C.

[0008] In a further embodiment, the asphalt coke powder is divided into powder A with 100-150 mesh, powder B with 150-250 mesh, and powder C with 250-350 mesh.

[0009] A method for preparing a carbon fiber graphite composite plate, used for the above-mentioned carbon fiber graphite composite plate, the preparation method comprising:

[0010] A: Opening: Use the opening equipment to open the waste felt and carbon felt scraps;

[0011] B: Cutting: The loosened carbon fiber is transported to the cutting machine, and the carbon fiber is cut into short fibers of different lengths by the cutting machine;

[0012] C: Grinding: Grinding the large particles of asphalt coke using a grinding machine;

[0013] D: Classification: The fine particles of the ground powder are separated into powder A, powder B and powder C through screening or grading equipment.

[0014] E: Grading: Take 5 parts of graded powder A, 3 parts of powder B and 2 parts of powder C, put them into a blender and stir at room temperature until they are evenly mixed;

[0015] F: Asphalt melting: Add the modified asphalt into the heating kettle to melt the asphalt into liquid state;

[0016] G: Mixing: Add the graded powder, melted asphalt and short fibers into the mixing equipment in sequence for mixing;

[0017] H: Pressing: The mixed paste is transported to the mold of the press and the press is turned on for pressing;

[0018] I: Calcination: Place the formed material in a calcination furnace and heat it;

[0019] J: Graphitization: Graphitization by heating;

[0020] K: Machining: After the above steps are completed and tested, they will enter the machining stage and be processed according to the required dimensions.

[0021] In a further embodiment, in step B, the length of the short fibers is 5 to 20 mm.

[0022] In a further embodiment, in step E, powder A, powder B and powder C are stirred in a mixer at room temperature for 15 to 30 minutes.

[0023] In a further embodiment, in step F, the temperature in the kettle is maintained at 140-160°C.

[0024] In a further embodiment, in step G, first 6 to 7 parts of the graded powder are added to the mixing equipment, and the powder temperature is maintained between 150 and 190°C. Then 3 to 4 parts of melted asphalt are added to the mixing equipment for mixing. Finally, 0.1 to 0.2 parts of short fibers are added to the mixing equipment in small amounts at a time, and the temperature is maintained at 150 to 190°C for mixing for 1.5 to 2 hours.

[0025] In a further embodiment, in step I, the formed material is placed in a roasting furnace, heated to 1000-1200° C. at a temperature rise rate of 5-10° C. / h, and kept warm for 7-10 days.

[0026] In a further embodiment, in step J, the graphitization is performed by heating to 2800-3000° C. at a temperature rise rate of 150-200° C. / h.

[0027] Beneficial effects: The present invention makes full use of waste residues and scraps, and fully utilizes the advantages of carbon fiber, such as light weight, good tensile and flexural strength, to transform the original pure graphite products, so that the new products have the advantages of low density, convenient disassembly and assembly, not easy to damage, and long life. At the same time, waste utilization reduces production costs and improves benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the preparation method of the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] A carbon fiber graphite composite plate and a preparation method thereof, comprising:

[0031] A: Opening: Use opening equipment to open the waste felt and carbon felt scraps. The performance indicators of carbon felt are as follows: carbon content ≥99.9%, ash content ≤500ppm.

[0032] B: Cutting: The loosened carbon fiber is transported to the cutting machine, and the cutting machine cuts the carbon fiber into short fibers of varying lengths of 5 to 20 mm.

[0033] C: Grinding: Grinding the large-particle asphalt coke with a grinding machine, wherein the carbon content of the asphalt coke is ≥ 98%, the ash content is ≤ 0.5%, and the sulfur content is ≤ 0.5%.

[0034] D: Classification: The fine particles of the ground powder are separated into powder A (100 mesh ~ 150 mesh), powder B (150 mesh ~ 250 mesh), and powder C (250 mesh ~ 350 mesh) through screening or grading equipment.

[0035] E: Grading: Take 5 parts of graded powder A, 3 parts of powder B and 2 parts of powder C, put them into a blender and stir at room temperature for 15 to 30 minutes to mix evenly.

[0036] F: Melting of asphalt: Add the modified asphalt into a heating kettle, maintain the temperature in the kettle at 140-160°C, and melt the asphalt into a liquid state. The ash content of the asphalt is ≤ 0.3%, and the softening point is 100-110°C.

[0037] G: Mixing: First, add 6 to 7 parts of the graded powder into the mixing equipment, maintain the powder temperature between 150 and 190°C, then add 3 to 4 parts of melted asphalt into the mixing equipment for mixing, and finally add 0.1 to 0.2 parts of short fibers in small amounts into the mixing equipment, maintain the temperature at 150 to 190°C and mix for 1.5 to 2 hours.

[0038] H: Pressing: The mixed paste is conveyed to the mold of the press and the press is turned on for pressing.

[0039] I: Calcination: Place the formed material in a calcining furnace, heat it to 1000-1200°C at a temperature rise rate of 5-10°C / h, and keep it warm for 7-10 days.

[0040] J: Graphitization: Heating to 2800-3000°C at a temperature rise rate of 150-200°C / h to graphitize it.

[0041] K: Machining: After the above steps are completed and tested, they will enter the machining stage and be processed according to the dimensions required by the customer.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A carbon fiber graphite composite plate, characterized in that: The composite board is made of short fibers, asphalt coke powder and modified asphalt; The short fibers are made of waste felt and carbon felt scraps; The asphalt coke powder is made of large-particle asphalt, and the carbon content of the asphalt coke powder is ≥ 98%, the ash content is ≤ 0.5%, and the sulfur content is ≤ 0.5%; The ash content of the modified asphalt is ≤0.3% and the softening point is 100-110°C.

2. A carbon fiber graphite composite plate according to claim 1, characterized in that: The asphalt coke powder is divided into A powder 100-150 mesh, B powder 150-250 mesh, C powder 250-350 mesh.

3. The method for preparing a carbon fiber graphite composite plate according to claim 1, characterized in that: Used to prepare the carbon fiber graphite composite plate according to any one of claims 1 to 2, the preparation method comprising: A: Opening: Use the opening equipment to open the waste felt and carbon felt scraps; B: Cutting: The loosened carbon fiber is transported to the cutting machine, and the carbon fiber is cut into short fibers of different lengths by the cutting machine; C: Grinding: Grinding the large particles of asphalt coke using a grinding machine; D: Classification: The fine particles of the ground powder are separated into powder A, powder B and powder C through screening or grading equipment. E: Grading: Take 5 parts of graded powder A, 3 parts of powder B and 2 parts of powder C, put them into a blender and stir at room temperature until they are evenly mixed; F: Asphalt melting: Add the modified asphalt into the heating kettle to melt the asphalt into liquid state; G: Mixing: Add the graded powder, melted asphalt and short fibers into the mixing equipment in sequence for mixing; H: Pressing: The mixed paste is transported to the mold of the press and the press is turned on for pressing; I: Calcination: Place the formed material in a calcination furnace and heat it; J: Graphitization: Graphitization by heating; K: Machining: After the above steps are completed and tested, they will enter the machining stage and be processed according to the required dimensions.

4. The method for preparing a carbon fiber graphite composite plate according to claim 3, characterized in that: In step B, the length of the short fibers is 5 to 20 mm.

5. The method for preparing a carbon fiber graphite composite plate according to claim 3, characterized in that: In step E, powder A, powder B and powder C are stirred in a mixer at room temperature for 15 to 30 minutes.

6. The method for preparing a carbon fiber graphite composite plate according to claim 3, characterized in that: In step F, the temperature in the kettle is maintained at 140-160°C.

7. The method for preparing a carbon fiber graphite composite plate according to claim 3, characterized in that: In step G, first add 6 to 7 parts of the graded powder into the mixing equipment, maintain the powder temperature between 150 and 190°C, then add 3 to 4 parts of melted asphalt into the mixing equipment for mixing, and finally add 0.1 to 0.2 parts of short fibers in small amounts into the mixing equipment, maintain the temperature at 150 to 190°C and mix for 1.5 to 2 hours.

8. The method for preparing a carbon fiber graphite composite plate according to claim 3, characterized in that: In step I, the formed material is placed in a roasting furnace, heated to 1000-1200° C. at a temperature rise rate of 5-10° C. / h, and kept warm for 7-10 days.

9. The method for preparing a carbon fiber graphite composite plate according to claim 3, characterized in that: In step J, the steel is graphitized by heating to 2800-3000° C. at a temperature increase rate of 150-200° C. / h.

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