A short carbon fiber reinforced carbon carbon felt and a method for manufacturing the same

Abstract

The application relates to the technical field of lithium battery cartridge manufacturing, and particularly discloses a short-fiber carbon fiber reinforced carbon-carbon cartridge and a preparation method thereof. The short-fiber carbon fiber reinforced carbon-carbon cartridge comprises the following raw materials in parts by weight: 15-45 parts of chopped carbon fibers, 38-63 parts of carbon powder or graphite powder, 10-40 parts of resin, 10-20 parts of coal tar pitch and 10-30 parts of fillers. The preparation method of the short-fiber carbon fiber reinforced carbon-carbon cartridge comprises the following steps: S1, stirring and mixing raw materials to obtain a mixture for standby; S2, placing the mixture obtained in S1 in a product mold and hot-pressing to form; S3, placing the semi-finished product hot-pressed in S2 in a high-temperature furnace for carbonization, and keeping vacuum or filling protective gas during the carbonization process; and S4, placing the semi-finished product carbonized in S3 in a high-temperature deposition furnace for CVI gas phase deposition to deposit a C coating, so as to obtain the short-fiber carbon fiber carbon-carbon cartridge.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium battery crucible manufacturing, in particular to a short carbon fiber reinforced carbon-carbon crucible and a preparation method thereof. BACKGROUND

[0002] The crucible is a new special tool for preparing ternary lithium and other raw materials in the lithium battery industry. In the traditional industry, the crucible is mainly made of inorganic non-metallic materials or graphite materials and is formed by pressing and baking. The main disadvantage is that the mechanical properties of the materials are poor, and damage such as wear and collision, cracking and the like easily occurs, thereby shortening the service life of the crucible. The new continuous fiber carbon-carbon crucible has the advantages of good sealing performance and high mechanical properties, can effectively solve the short service life, and can slow down the corrosion speed of lithium on the crucible to some extent, thereby effectively reducing the life cycle cost, and can be thinned in thickness compared with the graphite crucible, thereby improving the loading capacity of the negative electrode raw material and achieving rapid development. However, due to the high cost of raw materials and the complex preparation process (preparation of a preform, chemical vapor infiltration CVI, impregnation carbonization PIP, high-temperature graphitization, machining and coating), the price is high, and the manufacturing cycle is long. SUMMARY

[0003] In order to solve at least one of the above technical problems, a crucible with good mechanical properties, better electrical conductivity, low cost and relatively simple preparation process is developed, and the application provides a short carbon fiber reinforced carbon-carbon crucible and a preparation method thereof.

[0004] In one aspect, the short carbon fiber reinforced carbon-carbon crucible provided by the application comprises the following raw materials by weight: 15-45 parts of chopped carbon fiber, 38-63 parts of carbon powder or graphite powder, 10-40 parts of resin, 10-20 parts of coal tar pitch and 10-30 parts of filler; the resin is one of phenolic resin and bismaleimide resin.

[0005] The filler comprises silicon carbide.

[0006] By adopting the above technical solution, the application selects specific chopped carbon fiber, carbon powder or graphite powder, resin, coal tar pitch and filler and compounding them in a specific proportion, and the prepared crucible has excellent mechanical properties, thermal conductivity, electrical conductivity and corrosion resistance, thereby prolonging the service life of the crucible. The chopped carbon fiber has excellent electrical conductivity, high strength and high modulus, and also has high thermal conductivity, which can improve the electrical conductivity, mechanical strength and thermal conductivity of the crucible. The carbon powder, graphite powder and coal tar pitch can enhance the mechanical strength of the crucible and also increase the stability of the crucible, thereby reducing the side reaction and oxidation reaction of the battery during charging and discharging. The filler can improve the strength, hardness and high-temperature resistance of the crucible. The resin can be used as a binder to bond other raw materials together to form a solid crucible structure.

[0007] Optionally, the short carbon fiber reinforced carbon carbon retort comprises the following raw materials in parts by weight: 20-35 parts of chopped carbon fiber, 40-60 parts of carbon powder or graphite powder, 20-30 parts of resin, 13-18 parts of coal tar pitch and 15-25 parts of filler.

[0008] Optionally, the chopped carbon fiber is one or more of T300 carbon fiber, T400 carbon fiber and T700 carbon fiber, and the length of the chopped carbon fiber is 2-20 mm.

[0009] Optionally, the length of the chopped carbon fiber is 5-15 mm.

[0010] By adopting the above technical solution, the application selects one of T300, T400 and T700 chopped carbon fiber as the reinforcing phase, and limits the length of the chopped carbon fiber, so that the carbon retort has excellent electrical conductivity and good dispersion performance, the electrical conductivity of the product can be effectively improved, the uniformity of the electrical conductivity is better, local overheating and arc generation are avoided, the power consumption of the box furnace in the carbonization and graphitization process of the lithium battery negative material can be effectively reduced, the mechanical strength of the retort can be enhanced, the tensile, compressive and impact resistance of the retort can be improved, and the risk of deformation and rupture can be reduced.

[0011] Optionally, the particle size of the carbon powder or graphite powder is 200-400 mesh.

[0012] Optionally, the particle size of the resin is 200-300 mesh.

[0013] By adopting the above technical solution, the type and particle size of the resin are limited, the phenolic resin and bismaleimide resin with good chemical resistance are selected, and the corrosion resistance of the retort can be enhanced.

[0014] Optionally, the filler further comprises diatomite and alumina.

[0015] Optionally, the mass ratio of diatomite, silicon carbide and alumina in the filler is 1:(2-5):(0.4-1).

[0016] Optionally, the particle size of the filler is 200-600 mesh.

[0017] By adopting the above technical solution, the application selects the filler compounded by diatomite, silicon carbide and alumina in a specific ratio, and further limits the particle size of the filler, so that the dispersion of the filler can be enhanced, the shrinkage resistance, structural strength and high temperature resistance of the retort can be improved, and the safety, stability and service life of the lithium battery can be improved.

[0018] In a second aspect, the application provides a preparation method of the above short carbon fiber reinforced carbon carbon retort, comprising the following steps: S1, stirring and mixing chopped carbon fiber, carbon powder or graphite powder, resin, coal tar pitch and filler to obtain a mixture for standby use;

[0019] S2, placing the mixture obtained in S1 in a product mold, hot-pressing forming, the mold pressing temperature is 80-250 DEG C, the pressure is 10-30 MPa, to obtain semi-finished product I;

[0020] S3, placing the semi-finished product I in S2 in a high-temperature furnace for carbonization, keeping vacuum or filling protective gas during the carbonization process, the carbonization temperature is 800-1100 DEG C, to obtain semi-finished product II;

[0021] S4, placing the semi-finished product II in S3 in a high-temperature deposition furnace for CVI gas phase deposition, depositing C coating, depositing for 24-30 h, to obtain the short carbon fiber carbon carbon anode.

[0022] By adopting the technical scheme, the preparation process of the anode is relatively simple, compared with the preparation process (deposition, impregnation carbonization, graphitization, machining, coating) of the preform carbon carbon anode, near-size forming and low-cost manufacturing are realized, and the preparation of the carbon carbon anode product with high quality and low cost has obvious advantages.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The present application selects specific chopped carbon fibers, carbon powder or graphite powder, resin, coal tar pitch and filler and compounding according to a specific proportion, and the prepared anode has excellent mechanical properties, thermal conductivity, electrical conductivity and corrosion resistance, which improves the service life of the anode. The chopped carbon fiber has excellent electrical conductivity, high strength and high modulus, and also has high thermal conductivity, which can improve the electrical conductivity, mechanical strength and thermal conductivity of the anode. The carbon powder, graphite powder and coal tar pitch can enhance the mechanical strength of the anode, and also can increase the stability of the anode, reduce the side reaction and oxidation reaction of the battery during charging and discharging. The filler can improve the strength, hardness and high temperature resistance of the anode. The resin can be used as a binder to bond other raw materials together to form a solid anode structure.

[0025] 2. The present application selects a filler compounded by a specific proportion of diatomite, silicon carbide and alumina, and further limits the particle size of the filler, which can enhance the dispersibility of the filler, improve the shrinkage resistance, structural strength and high temperature resistance of the anode, and improve the safety, stability and service life of the lithium battery.

[0026] 3. The preparation process of the anode of the present application is relatively simple, compared with the preparation process (deposition, impregnation carbonization, graphitization, machining, coating) of the preform carbon carbon anode, near-size forming and low-cost manufacturing are realized, and the preparation of the carbon carbon anode product with high quality and low cost has obvious advantages. DETAILED DESCRIPTION

[0027] The application will be further described in detail below in combination with examples.

[0028] The short carbon fiber reinforced carbon carbon kiln of the application comprises the following raw materials by weight: 15-45 parts of chopped carbon fiber, 38-63 parts of carbon powder or graphite powder, 10-40 parts of resin, 10-20 parts of coal tar pitch and 10-30 parts of filler;

[0029] The resin is one of phenolic resin and bismaleimide resin.

[0030] The filler comprises silicon carbide.

[0031] The short carbon fiber reinforced carbon carbon kiln of the application is prepared by the following method comprising the following steps:

[0032] S1, the chopped carbon fiber, carbon powder or graphite powder, resin, coal tar pitch and filler are stirred and mixed to obtain a mixture for standby;

[0033] S2, the mixture obtained in S1 is placed in a product mold and hot-pressed to form a semi-finished product I, the mold pressing temperature is 80-250 DEG C, the pressure is 10-30 MPa;

[0034] S3, the semi-finished product I in S2 is placed in a high temperature furnace for carbonization, the vacuum or protective gas is filled during the carbonization process, the carbonization temperature is 800-1100 DEG C, and the semi-finished product II is obtained;

[0035] S4, the semi-finished product II in S3 is placed in a high temperature deposition furnace for CVI gas phase deposition, a C coating is deposited, the deposition time is 24-30 h, and the short carbon fiber carbon carbon kiln is obtained.

[0036] The short carbon fiber reinforced carbon carbon kiln of the application can be applied in the field of kiln manufacturing. Specific embodiments

[0038] The raw materials used in the application are all from commercially available products, and the specific sources are as follows:

[0039] Chopped carbon fiber: Shenzhen Turing Evolution Technology Co., Ltd., item number: T300, T400, T700;

[0040] Carbon powder: Hebei Yuan Ying New Material Co., Ltd.;

[0041] Graphite powder: Shanghai Xili Carbon Co., Ltd., item number: XLJ;

[0042] Phenolic resin: Zhengzhou Erqi Leixiang Chemical Trading Co., Ltd., model number: W2123;

[0043] Bismaleimide resin: Laizhou Baichen Insulating Material Co., Ltd.;

[0044] Coal tar pitch: Hebei Weixiang Chemical Technology Co., Ltd.;

[0045] Diatomaceous earth: Hebei Kexu Building Material Co., Ltd., item number: KX-GZT;

[0046] Silicon carbide: Ningxia Dehui Carbon Supplier, model: DH-06;

[0047] Alumina: Dongguan Dongchao New Material Technology Co., Ltd., item number: DCA-W.

[0048] The following are Examples 1-30 and Comparative Examples 1-2 of the present application, which respectively provide a short fiber carbon fiber reinforced carbon carbon kiln and a preparation method thereof.

[0049] The short fiber carbon fiber reinforced carbon carbon kiln prepared by Examples 1-30 and Comparative Examples 1-2 of the present application were subjected to experimental detection, and the detection items and detection methods are as follows:

[0050] Bending strength test: The bending strength of the prepared kiln was tested by four-point bending method; the kiln was cut into a size of 40mm x 5mm, and tested according to GB / T 14390-2008 standard.

[0051] Pressure resistance test: tested according to GB / T 5072-2008 standard.

[0052] Electrical conductivity test: tested the resistivity according to QJ 3074-1998 standard, and then calculated the electrical conductivity.

[0053] Example 1

[0054] A short fiber carbon fiber reinforced carbon carbon kiln, comprising the following components and the ratio of each component: 15 parts of T300 chopped carbon fiber with a length of 2mm, 45 parts of carbon powder with a particle size of 100 mesh, 15 parts of phenolic resin with a particle size of 100 mesh, 17 parts of coal tar pitch, and 26 parts of filler with a particle size of 100 mesh, wherein the filler is silicon carbide.

[0055] A preparation method of a short fiber carbon fiber reinforced carbon carbon kiln, comprising the following steps:

[0056] S1, stirring and mixing the raw materials to obtain a mixture for standby;

[0057] S2, placing the mixture obtained in S1 in a product mold, hot pressing, temperature is 80℃, pressure is 30MPa, hot pressing for 1h, to obtain a semi-finished product I;

[0058] S3, placing the semi-finished product I in S2 in a high temperature furnace for carbonization for 2h, filling protective gas nitrogen during the carbonization process, carbonization temperature is 800℃, to obtain a semi-finished product II;

[0059] S4, placing the semi-finished product II in S3 in a high-temperature deposition furnace for CVI gas-phase deposition to deposit a C coating, depositing for 26 hours to obtain the short carbon fiber reinforced carbon-carbon hearth.

[0060] Example 2

[0061] A short carbon fiber reinforced carbon-carbon hearth comprises the following components and their proportions: 18 parts of T400 short carbon fiber with a length of 2 mm, 63 parts of carbon powder with a particle size of 100 mesh, 10 parts of phenolic resin with a particle size of 100 mesh, 20 parts of coal tar pitch, and 30 parts of filler with a particle size of 100 mesh, wherein the filler is silicon carbide.

[0062] A method for preparing a short carbon fiber reinforced carbon-carbon hearth comprises the following steps:

[0063] S1, stirring and mixing raw materials to obtain a mixture for standby use;

[0064] S2, placing the mixture obtained in S1 in a product mold for hot pressing, with a temperature of 120°C, a pressure of 25 MPa, and hot pressing for 1 hour to obtain a semi-finished product I;

[0065] S3, placing the semi-finished product I in S2 in a high-temperature furnace for carbonization for 2 hours, with nitrogen gas being filled in during the carbonization process, and a carbonization temperature of 900°C to obtain a semi-finished product II;

[0066] S4, placing the semi-finished product II in S3 in a high-temperature deposition furnace for CVI gas-phase deposition to deposit a C coating, depositing for 30 hours to obtain the short carbon fiber reinforced carbon-carbon hearth.

[0067] Example 3

[0068] A short carbon fiber reinforced carbon-carbon hearth comprises the following components and their proportions: 39 parts of T700 short carbon fiber with a length of 2 mm, 54 parts of carbon powder with a particle size of 100 mesh, 35 parts of phenolic resin with a particle size of 100 mesh, 12 parts of coal tar pitch, and 10 parts of filler with a particle size of 100 mesh, wherein the filler is silicon carbide.

[0069] A method for preparing a short carbon fiber reinforced carbon-carbon hearth comprises the following steps:

[0070] S1, stirring and mixing raw materials to obtain a mixture for standby use;

[0071] S2, placing the mixture obtained in S1 in a product mold for hot pressing, with a temperature of 180°C, a pressure of 15 MPa, and hot pressing for 1 hour to obtain a semi-finished product I;

[0072] S3, placing the semi-finished product I in S2 in a high-temperature furnace for carbonization for 1.5 hours, with nitrogen gas being filled in during the carbonization process, and a carbonization temperature of 1000°C to obtain a semi-finished product II;

[0073] S4, placing the semi-finished product II in S3 in a high-temperature deposition furnace for CVI gas-phase deposition to deposit a C coating, depositing for 26 hours to obtain the short-fiber carbon fiber reinforced carbon carbon anode.

[0074] Example 4

[0075] A short-fiber carbon fiber reinforced carbon carbon anode comprises the following components and the proportions of the components: 45 parts of T300 short-cut carbon fiber with a length of 2 mm, 38 parts of graphite powder with a particle size of 100 mesh, 40 parts of bismaleimide resin with a particle size of 100 mesh, 10 parts of coal tar pitch, and 14 parts of filler with a particle size of 100 mesh, the filler being silicon carbide.

[0076] A method for preparing a short-fiber carbon fiber reinforced carbon carbon anode comprises the following steps:

[0077] S1, mixing raw materials to obtain a mixture for standby;

[0078] S2, placing the mixture obtained in S1 in a product mold for hot pressing, the mold pressing temperature being 250°C, the pressure being 10 MPa, and the hot pressing time being 1 hour to obtain a semi-finished product I;

[0079] S3, placing the semi-finished product I in S2 in a high-temperature furnace for carbonization for 1 hour, nitrogen gas being filled in during the carbonization process, the carbonization temperature being 1100°C to obtain a semi-finished product II;

[0080] S4, placing the semi-finished product II in S3 in a high-temperature deposition furnace for CVI gas-phase deposition to deposit a C coating, depositing for 24 hours to obtain the short-fiber carbon fiber reinforced carbon carbon anode.

[0081] Comparative Example 1

[0082] Based on Example 1, the difference between Comparative Example 1 and Example 1 is that no short-cut carbon fiber is included in Comparative Example 1, and the other steps and conditions are the same as in Example 1.

[0083] Comparative Example 2

[0084] Based on Example 1, the difference between Comparative Example 2 and Example 1 is that no coal tar pitch is included in Comparative Example 2, and the other steps and conditions are the same as in Example 1.

[0085] Experimental detection

[0086] The anodes obtained in Examples 1-4 and Comparative Examples 1-2 are detected according to the detection items and detection methods, and the detection results are shown in Table 1.

[0087] Table 1: Detection results of Examples 1-4 and Comparative Examples 1-2

[0088]

[0089] In combination with the results of Examples 1-4, Comparative Examples 1-2 and Table 1, it can be seen that the short carbon fiber reinforced carbon carbon kiln according to the present application has good bending strength and pressure resistance, and high electrical conductivity. Compared with traditional graphite kiln, the carbon carbon kiln according to the present application has better mechanical properties and electrical conductivity, excellent comprehensive performance, and longer service life. Compared with continuous carbon fiber preform kiln, the carbon carbon kiln according to the present application has low raw material cost and relatively simple preparation process while ensuring high quality.

[0090] Example 5

[0091] A short carbon fiber reinforced carbon carbon kiln, comprising the following components and their proportions: 35 parts of T300 chopped carbon fiber with a length of 2 mm, 40 parts of carbon powder with a particle size of 100 mesh, 30 parts of phenolic resin with a particle size of 100 mesh, 17 parts of coal tar pitch, and 15 parts of filler with a particle size of 100 mesh, the filler being silicon carbide. The preparation method is consistent with that of Example 3.

[0092] Example 6

[0093] A short carbon fiber reinforced carbon carbon kiln, comprising the following components and their proportions: 20 parts of T400 chopped carbon fiber with a length of 2 mm, 60 parts of graphite powder with a particle size of 100 mesh, 23 parts of phenolic resin with a particle size of 100 mesh, 13 parts of coal tar pitch, and 25 parts of filler with a particle size of 100 mesh, the filler being silicon carbide. The preparation method is consistent with that of Example 3.

[0094] Example 7

[0095] A short carbon fiber reinforced carbon carbon kiln, comprising the following components and their proportions: 28 parts of T700 chopped carbon fiber with a length of 2 mm, 48 parts of carbon powder with a particle size of 100 mesh, 25 parts of phenolic resin with a particle size of 100 mesh, 15 parts of coal tar pitch, and 20 parts of filler with a particle size of 100 mesh, the filler being silicon carbide. The preparation method is consistent with that of Example 3.

[0096] Example 8

[0097] A short carbon fiber reinforced carbon carbon kiln, comprising the following components and their proportions: 24 parts of T300 chopped carbon fiber with a length of 2 mm, 55 parts of graphite powder with a particle size of 100 mesh, 20 parts of bismaleimide resin with a particle size of 100 mesh, 18 parts of coal tar pitch, and 18 parts of filler with a particle size of 100 mesh, the filler being silicon carbide. The preparation method is consistent with that of Example 3.

[0098] Experimental detection

[0099] The kilns prepared in Examples 5-8 were detected according to the detection items and methods, and the detection results are shown in Table 2.

[0100] Table 2: Test results of Examples 5-8

[0101]

[0102] In combination with the data of Examples 1-8, Table 1 and Table 2, it can be seen that when the short carbon fiber reinforced carbon carbon kiln raw material composition and ratio is: 20-35 parts of short carbon fiber, 40-60 parts of carbon powder or graphite powder, 20-30 parts of resin, 13-18 parts of coal tar pitch and 15-25 parts of filler, the carbon carbon kiln prepared has better comprehensive performance.

[0103] Example 9

[0104] Based on Example 7, the difference between Example 9 and Example 7 is that the length of the short carbon fiber in this example is 5 mm, and the remaining steps and conditions are the same as those in Example 7.

[0105] Example 10

[0106] Based on Example 7, the difference between Example 10 and Example 7 is that the length of the short carbon fiber in this example is 10 mm, and the remaining steps and conditions are the same as those in Example 7.

[0107] Example 11

[0108] Based on Example 7, the difference between Example 11 and Example 7 is that the length of the short carbon fiber in this example is 15 mm, and the remaining steps and conditions are the same as those in Example 7.

[0109] Example 12

[0110] Based on Example 7, the difference between Example 12 and Example 7 is that the length of the short carbon fiber in this example is 18 mm, and the remaining steps and conditions are the same as those in Example 7.

[0111] Example 13

[0112] Based on Example 7, the difference between Example 13 and Example 7 is that the length of the short carbon fiber in this example is 20 mm, and the remaining steps and conditions are the same as those in Example 7.

[0113] Experimental test

[0114] Referring to the test items and test methods, the kiln prepared in Examples 9-13 was tested, and the test results are shown in Table 3.

[0115] Table 3: Test results of Examples 9-13

[0116]

[0117] In combination with the data of Examples 9-13 and Table 3, it can be seen that the bending strength, pressure resistance and electrical conductivity are all improved, which shows that the use of the short-cut carbon fibers with a length of 5-15 mm in the present application further improves the comprehensive performance of the carbon carbon anode.

[0118] Example 14

[0119] Based on Example 10, Example 14 differs from Example 10 in that the particle size of the carbon powder in the present example is 200 mesh, and the other steps and conditions are the same as in Example 10.

[0120] Example 15

[0121] Based on Example 10, Example 15 differs from Example 10 in that the particle size of the carbon powder in the present example is 300 mesh, and the other steps and conditions are the same as in Example 10.

[0122] Example 16

[0123] Based on Example 10, Example 16 differs from Example 10 in that the particle size of the carbon powder in the present example is 400 mesh, and the other steps and conditions are the same as in Example 10.

[0124] Example 17

[0125] Based on Example 10, Example 17 differs from Example 10 in that the particle size of the carbon powder in the present example is 450 mesh, and the other steps and conditions are the same as in Example 10.

[0126] Experimental detection

[0127] The anodes prepared in Examples 14-17 were detected according to the detection items and methods, and the detection results are shown in Table 4.

[0128] Table 4 Detection results of Examples 14-17

[0129]

[0130] In combination with the data of Examples 14-17 and Table 4, it can be seen that the bending strength, pressure resistance and electrical conductivity are all improved, which shows that the use of the carbon powder with a particle size of 200-400 mesh in the present application further improves the comprehensive performance of the carbon carbon anode.

[0131] Example 18

[0132] Based on Example 15, Example 18 differs from Example 15 in that the particle size of the resin in the present example is 200 mesh, and the other steps and conditions are the same as in Example 15.

[0133] Example 19

[0134] Based on Example 15, Example 19 is different from Example 15 in that the particle size of the resin in this example is 250 mesh, and the remaining steps and conditions are consistent with those in Example 15.

[0135] Example 20

[0136] Based on Example 15, Example 20 is different from Example 15 in that the particle size of the resin in this example is 300 mesh, and the remaining steps and conditions are consistent with those in Example 15.

[0137] Example 21

[0138] Based on Example 15, Example 21 is different from Example 15 in that the particle size of the resin in this example is 350 mesh, and the remaining steps and conditions are consistent with those in Example 15.

[0139] Experimental detection

[0140] Referring to the detection items and detection methods, the ladles prepared in Examples 18-21 were detected, and the detection results are shown in Table 5.

[0141] Table 5 Detection results of Examples 18-21

[0142]

[0143] In combination with Examples 18-21 and the data in Table 5, it can be seen that the bending strength, pressure resistance and electrical conductivity are all improved, which indicates that when the resin with a particle size of 200-300 mesh is used, the comprehensive performance of the carbon carbon ladle prepared is further improved.

[0144] Example 22

[0145] Based on Example 19, Example 22 is different from Example 19 in that the filler in this example further includes diatomite and alumina, and the weight ratio of diatomite, silicon carbide and alumina is 1:1:1.5, and the remaining steps and conditions are consistent with those in Example 19.

[0146] Example 23

[0147] Based on Example 19, Example 23 is different from Example 19 in that the filler in this example further includes diatomite and alumina, and the weight ratio of diatomite, silicon carbide and alumina is 1:6:0.2, and the remaining steps and conditions are consistent with those in Example 19.

[0148] Example 24

[0149] Based on example 19, example 24 is different from example 19 in that the filler in the present example further comprises diatomite and alumina, and the weight ratio of diatomite, silicon carbide and alumina is 1:2:0.4, and the remaining steps and conditions are consistent with those in example 19.

[0150] Example 25

[0151] Based on example 19, example 25 is different from example 19 in that the filler in the present example further comprises diatomite and alumina, and the weight ratio of diatomite, silicon carbide and alumina is 1:4:0.8, and the remaining steps and conditions are consistent with those in example 19.

[0152] Example 26

[0153] Based on example 19, example 26 is different from example 19 in that the filler in the present example further comprises diatomite and alumina, and the weight ratio of diatomite, silicon carbide and alumina is 1:5:1, and the remaining steps and conditions are consistent with those in example 19.

[0154] Example 27

[0155] Based on example 19, example 27 is different from example 19 in that the filler in the present example is diatomite, and the remaining steps and conditions are consistent with those in example 19.

[0156] Example 28

[0157] Based on example 19, example 28 is different from example 19 in that the filler in the present example is alumina, and the remaining steps and conditions are consistent with those in example 19.

[0158] Experimental detection

[0159] According to the detection items and detection methods, the kiln blocks prepared in examples 22-28 were detected, and the detection results are shown in table 6.

[0160] Table 6: Detection results of examples 22-28

[0161]

[0162] It can be seen from examples 22-28 and table 6 that the bending strength and pressure resistance are improved, which shows that when diatomite, silicon carbide and alumina are used as fillers and the mass ratio of the three is 1:(2-5):(0.4-1), the comprehensive performance of the prepared carbon-carbon kiln block is further improved.

[0163] Example 29

[0164] Based on example 25, example 29 is different from example 25 in that the particle size of the filler in this example is 200 mesh, and the remaining steps and conditions are consistent with those in example 25.

[0165] Example 30

[0166] Based on example 25, example 30 is different from example 25 in that the particle size of the filler in this example is 400 mesh, and the remaining steps and conditions are consistent with those in example 25.

[0167] Example 31

[0168] Based on example 25, example 31 is different from example 25 in that the particle size of the filler in this example is 600 mesh, and the remaining steps and conditions are consistent with those in example 25.

[0169] Example 32

[0170] Based on example 25, example 32 is different from example 25 in that the particle size of the filler in this example is 650 mesh, and the remaining steps and conditions are consistent with those in example 25.

[0171] Experimental detection

[0172] According to the detection items and detection methods, the carbon-carbon kiln blocks prepared in examples 29-32 were detected, and the detection results are shown in table 7.

[0173] Table 7: Detection results of examples 29-32

[0174]

[0175] According to the data of examples 29-32 and table 7, the bending strength, pressure resistance and electrical conductivity are all improved, which indicates that when the particle size of the filler is 200-600 mesh, the comprehensive performance of the prepared carbon-carbon kiln block is further improved, and the comprehensive performance of the carbon-carbon kiln block is better.

[0176] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A short carbon fiber reinforced carbon carbon felt, characterized by, The short carbon fiber, the carbon powder or the graphite powder, the resin, the coal tar pitch and the filler are mixed by stirring, and a mixture is obtained for standby use. The resin is one of a phenolic resin and a bismaleimide resin. The particle size of the carbon powder or the graphite powder is 200-400 mesh. The particle size of the resin is 200-300 mesh. The filler includes diatomite, silicon carbide and alumina, and the mass ratio of the diatomite, the silicon carbide and the alumina is 1: (2-5): (0.4-1).

2. The short fiber carbon fiber reinforced carbon carbon felt of claim 1, wherein, The short carbon fiber is one or more of T300 carbon fiber, T400 carbon fiber and T700 carbon fiber, and the length of the short carbon fiber is 2-20 mm.

3. The short fiber carbon fiber reinforced carbon carbon felt of claim 2, wherein, The length of the short carbon fiber is 5-15 mm.

4. The short fiber carbon fiber reinforced carbon carbon felt of claim 1, wherein, The particle size of the filler is 200-600 mesh.

5. A method of producing a short-fiber carbon fiber-reinforced carbon carbon muffi according to any one of claims 1 to 4, characterized by, The method comprises the following steps: S1, the short carbon fiber, the carbon powder or the graphite powder, the resin, the coal tar pitch and the filler are mixed by stirring, and a mixture is obtained for standby use; S2, the mixture obtained in S1 is placed in a product mold, and hot pressing is performed at a temperature of 80-250 DEG C and a pressure of 10-30 MPa to obtain a semi-finished product I; S3, the semi-finished product I in S2 is placed in a high-temperature furnace for carbonization, and a vacuum or a protective gas is filled during the carbonization process, and the carbonization temperature is 800-1100 DEG C to obtain a semi-finished product II; S4, the semi-finished product II in S3 is placed in a high-temperature deposition furnace for CVI gas phase deposition to deposit a C coating, and the deposition time is 24-30 h to obtain the short carbon fiber carbon carbon anode.

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