Highly conductive carbon brush material and method for making same

Abstract

The application discloses a high-conductivity carbon brush material and a preparation method thereof. The high-conductivity carbon brush material is prepared by the following steps: generating zirconium oxide on the surface of carbon black in situ through a sol method to obtain a carbon black composite material, further improving the wear resistance and hardness of the carbon black, loading copper-iron hydrotalcite on the surface of the carbon black composite material, and then performing calcination in a reducing atmosphere to obtain a copper-iron bimetallic loaded carbon black composite material. The copper has excellent conductive performance, and the iron also has certain conductivity. The copper-iron bimetallic is loaded on the surface of the carbon black composite material, and the combination of the two can improve the comprehensive conductive performance of the carbon brush material. Meanwhile, the characteristics of the copper and the iron can be complementary. The copper can reduce friction and improve lubricity, and the iron can increase hardness and wear resistance. The copper and the iron can form a uniform and stable friction film with moderate thickness on the friction surface in the process of electric friction, effectively ensuring the stability of the carbon brush in the running process, and greatly reducing the wear rate of the carbon brush material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon brush material preparation, in particular to a high-conductivity carbon brush material and a preparation method thereof. BACKGROUND

[0002] The carbon brush is an important component of the motor, and its function is to conduct current between the fixed part and the rotating part of the motor commutator or the current collector ring. Its performance directly affects the normal operation of the motor. Compared with ordinary mechanical friction and wear, carbon brush materials have multiple mechanical friction and wear mechanisms during motor operation, accompanied by arc ablation and electrical wear. The wear condition of the automobile starting motor is complex, and the carbon brush material is required to have large current-carrying capacity, excellent commutation performance and sliding contact performance. However, the conventional carbon brush will have phenomena such as accelerated wear and severe arc ablation under high-density current-carrying conditions, which cannot meet the use requirements.

[0003] At present, most carbon brushes are generally made of graphite, metal materials, resin adhesives and other additives, and are sintered into shape; although graphite has good wear resistance, it has the problem of easy wear in actual use, which is difficult to overcome. If the wear resistance of the carbon brush is not improved, it will seriously affect the performance and service life of the entire equipment. At present, the comprehensive performance of the carbon brush material is mainly improved by three ways of matrix alloying, surface treatment of graphite and addition of appropriate additives, for example, Chinese patent document 201710153401.4 discloses a lanthanum oxide doped modified copper-based graphite motor carbon brush and a preparation method thereof. The carbon brush material is prepared by compounding natural flake graphite, porous carbon powder, copper powder and bronze powder as a base material, and adding lanthanum oxide for modification treatment to improve the sintering performance. However, the hardness and bending strength of the prepared carbon brush material are still insufficient, in addition, although the addition of SiC particles can improve the deformation degree of the copper matrix during wear, SiC as a ceramic phase particle will adversely affect the electrical conductivity of the composite material; in order to obtain a low-cost long-life motor carbon brush material with good electrical conductivity and wear resistance, it is necessary to consider the reasonable matching between the material manufacturing cost, processability, thermal conductivity, electrical conductivity, mechanical properties and friction and wear properties, and reasonably design the material composition. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application aims to provide a high-conductivity carbon brush material and a preparation method thereof.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A high-conductivity carbon brush material comprises, by weight, the following raw materials: flake graphite powder 40-50 parts, expanded graphite 15-25 parts, copper powder 25-30 parts, pitch powder 5-10 parts, modified carbon black composite material 5-10 parts, carboxymethyl cellulose 1-3 parts, and sulfur powder 2-4 parts.

[0007] Specifically, in some embodiments of the present application, the flake graphite powder can be selected from 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, and 50 parts, but is not limited to the listed values, and other values not listed within the value range are also applicable.

[0008] In the present application, the flake graphite has excellent lubricating properties, can form a thin film between the carbon brush and the commutator, reduce friction and wear, thereby reducing heat generation and prolonging the service life of the carbon brush.

[0009] Specifically, in some embodiments of the present application, the expanded graphite can be selected from 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, and 25 parts, but is not limited to the listed values, and other values not listed within the value range are also applicable.

[0010] In the present application, the layered structure of the expanded graphite can form an effective lubricating film between the carbon brush and the commutator, significantly reduce the friction coefficient, and reduce wear, thereby improving the service life of the carbon brush; at the same time, the high thermal conductivity of the expanded graphite helps to improve the heat dissipation capacity of the carbon brush, reduce the temperature, and prevent material deterioration or performance degradation due to temperature rise.

[0011] Specifically, in some embodiments of the present application, the copper powder can be selected from 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, and 30 parts, but is not limited to the listed values, and other values not listed within the value range are also applicable.

[0012] In the present application, the copper powder has excellent electrical conductivity, which can significantly improve the electrical conductivity of the carbon brush; in addition, copper has good thermal conductivity, and the addition of copper powder helps to enhance the heat dissipation performance of the carbon brush, reduce the working temperature, and prevent performance degradation due to overheating.

[0013] Specifically, in some embodiments of the present application, the pitch powder can be selected from 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, and 10 parts, but is not limited to the listed values, and other values not listed within the value range are also applicable.

[0014] Specifically, in some embodiments of the present application, the modified carbon black composite material can be selected from 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, but not limited to the listed values, other values not listed in the value range are also applicable.

[0015] More specifically, the preparation method of the modified carbon black composite material is as follows:

[0016] S1, zirconium oxychloride is added to a hydrochloric acid solution, then carbon black is added, stirred uniformly, the pH of the solution is adjusted to 9-10, continue to stir for 1-3h, then filter, dry, calcine under nitrogen atmosphere, cool down and grind through a sieve to obtain a carbon black composite material;

[0017] S2, copper salt and iron salt are dissolved in deionized water, then carbon black composite material and cetyltrimethylammonium bromide are added, stirred uniformly, then nitrogen is introduced to remove air, NaOH solution is added dropwise under stirring, the pH of the solution is adjusted to 10-12, continue to stir for 1-3h after the dropwise addition is completed, put into an oven for aging, then wash, vacuum dry to obtain a copper-iron hydrotalcite / carbon black composite material;

[0018] S3, the copper-iron hydrotalcite / carbon black composite material is calcined in a reducing atmosphere, cooled down and ground through a sieve to obtain a modified carbon black composite material.

[0019] In step S1, the mass ratio of zirconium oxychloride to carbon black is 2-3:5-8, and is further preferably 2.4-2.8:6-7.

[0020] The mass fraction of the hydrochloric acid solution is 5-15%, for example, it can be selected from 5%, 8%, 10%, 12%, 15%.

[0021] The calcination temperature is 500-600℃, for example, it can be selected from 500℃, 510℃, 520℃, 530℃, 540℃, 550℃, 560℃, 570℃, 580℃, 590℃, 600℃; the calcination time is 2-5h, for example, it can be selected from 2h, 3h, 4h, 5h, but not limited to the listed values, other values not listed in the value range are also applicable.

[0022] In step S2, the mass ratio of copper salt, iron salt, carbon black composite material and cetyltrimethylammonium bromide is 8-12:6-8:10-15:1-2.

[0023] The copper salt is selected from soluble copper salts, for example, it can be selected from copper chloride, copper sulfate or copper nitrate.

[0024] The iron salt is selected from soluble iron salts, for example, it can be selected from iron chloride, iron sulfate or iron nitrate.

[0025] In step S2, the aging temperature is 60-80℃, for example, 60℃, 65℃, 70℃, 75℃, 80℃ can be selected; the aging time is 8-16h, for example, 8h, 10h, 12h, 14h, 16h can be selected, but is not limited to the listed values, other values not listed in the value range are also applicable.

[0026] In step S3, the reducing atmosphere is H2 atmosphere or CO atmosphere.

[0027] In step S3, the calcination temperature is 650-750℃, for example, 650℃, 670℃, 680℃, 700℃, 720℃, 740℃, 750℃ can be selected; the calcination time is 2-4h, for example, 2h, 2.5h, 3h, 3.5h, 4h can be selected, but is not limited to the listed values, other values not listed in the value range are also applicable.

[0028] The application also provides a preparation method of the high-conductivity carbon brush material, comprising the following steps: putting each raw material into a mixer according to weight parts, mixing uniformly, stirring at 60-80℃ for 1-2h, then crushing, sieving the obtained powder through a 200-mesh screen to obtain a fine powder, pressing the obtained fine powder in a mold, demolding to obtain a blank, then sintering at 800-850℃ for 30-60min, and pressing into a shape under a pressure of 160-180MPa, thereby obtaining the high-conductivity carbon brush material.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] The high-conductivity carbon brush material provided by the application generates zirconium oxide on the surface of carbon black in situ through a sol method to obtain a carbon black composite material, which further improves the wear resistance and hardness of the carbon black, then copper-iron hydrotalcite is loaded on the surface of the carbon black composite material, and then calcination is performed in a reducing atmosphere to obtain copper-iron bimetallic-loaded carbon black composite material. Copper has excellent conductivity, and iron also has certain conductivity. Loading copper-iron bimetallic on the surface of the carbon black composite material can improve the comprehensive conductivity of the carbon brush material, especially in high-frequency motor applications, the improvement effect is more significant, and the problem of reduced conductivity of carbon black caused by the introduction of zirconium oxide is avoided. Meanwhile, the characteristics of copper and iron can be complementary. Copper can reduce friction and improve lubricity, while iron can increase hardness and wear resistance. Copper and iron can form a uniform and stable friction film with moderate thickness on the friction surface during electric friction, effectively ensuring the stability of the carbon brush during operation, and greatly reducing the wear rate of the carbon brush material. DETAILED DESCRIPTION

[0031] The application is further described in detail below through specific preferred embodiments, but the application is not limited to the following embodiments.

[0032] It should be noted that, unless otherwise specified, the chemical reagents involved in the present application are purchased through commercial channels.

[0033] The specification of the flake graphite powder used in the present application is 325 mesh;

[0034] The specification of the expanded graphite is 200 mesh;

[0035] The specification of the pitch powder is 200-250 mesh;

[0036] The specification of the copper powder is 325 mesh, and the purity is 99.5%;

[0037] The carbon black is conductive carbon black powder, the carbon content is 99.5%, and the specification is 400 mesh;

[0038] The carboxymethyl cellulose is purchased from Shandong Zhengyang New Material Technology Co., Ltd.;

[0039] The specification of the sulfur powder is 400 mesh;

[0040] Example 1

[0041] A preparation method of a high-conductivity carbon brush material, comprising the following steps:

[0042] 45 parts of flake graphite powder, 20 parts of expanded graphite, 25 parts of copper powder, 8 parts of pitch powder, 8 parts of modified carbon black composite material, 2 parts of carboxymethyl cellulose and 2 parts of sulfur powder are put into a mixer and mixed uniformly, stirred at 60℃ for 2h, then pulverized, the obtained powder is sieved through a 200 mesh sieve to obtain a fine powder, the obtained fine powder is pressed in a mold, after demolding, a blank is obtained, then sintered at 800℃ for 45min, and pressed into a shape under a pressure of 160MPa, to obtain a high-conductivity carbon brush material;

[0043] The preparation method of the modified carbon black composite material is as follows:

[0044] S1, 2g of zirconium oxychloride is added to 100mL of 10wt% hydrochloric acid solution, then 6g of carbon black is added, stirred uniformly, the pH of the solution is adjusted to 10, and continues to stir for 2h, then filtered, dried, calcined under nitrogen atmosphere, the calcination temperature is 600℃, the calcination time is 3h, after cooling, ground through a 400 mesh sieve to obtain a carbon black composite material;

[0045] S2, 8g of copper chloride and 6g of iron chloride are dissolved in 100mL of deionized water, then 10g of carbon black composite material and 1g of cetyltrimethylammonium bromide are added, stirred uniformly, then nitrogen is introduced to remove air, 1mol / L NaOH solution is added dropwise under stirring, the pH of the solution is adjusted to 10, after the dropwise addition is completed, continues to stir for 2h, and then put into an 80℃ oven for aging for 12h, then washed, vacuum dried to obtain a copper-iron hydrotalcite / carbon black composite material;

[0046] S3, the copper iron hydrotalcite / carbon black composite material is calcined in a hydrogen atmosphere, the calcination temperature is 650 DEG C, the calcination time is 3h, after cooling, grinding through 400 mesh sieve, the modified carbon black composite material is obtained.

[0047] Example 2

[0048] A preparation method of a high-conductivity carbon brush material, comprising the following steps:

[0049] 40 parts of flake graphite powder, 15 parts of expanded graphite, 30 parts of copper powder, 5 parts of pitch powder, 10 parts of modified carbon black composite material, 3 parts of carboxymethyl cellulose and 4 parts of sulfur powder are put into a mixer and mixed uniformly, stirred at 60 DEG C for 2h, then pulverized, the obtained powder is sieved through a 200 mesh sieve to obtain a fine powder, the obtained fine powder is pressed in a mold, after demolding, a blank is obtained, then sintered at 850 DEG C for 30min, and pressed into shape under a pressure of 180MPa, a high-conductivity carbon brush material is obtained;

[0050] The preparation method of the modified carbon black composite material is as follows:

[0051] S1, 3g of zirconium oxychloride is added into 100mL of 10wt% hydrochloric acid solution, then 8g of carbon black is added, stirred uniformly, the pH of the solution is adjusted to 10, continues to stir for 2h, then filtered, dried, calcined under a nitrogen atmosphere, the calcination temperature is 500 DEG C, the calcination time is 5h, after cooling, grinding through a 400 mesh sieve, a carbon black composite material is obtained;

[0052] S2, 12g of copper chloride and 8g of iron chloride are dissolved in 100mL of deionized water, then 15g of carbon black composite material and 2g of cetyltrimethylammonium bromide are added, stirred uniformly, then nitrogen is introduced to remove air, under stirring, 1mol / L NaOH solution is added dropwise, the pH of the solution is adjusted to 10, after the dropwise addition is completed, continues to stir for 2h, put into an 80 DEG C oven for aging for 16h, then washed, vacuum dried, a copper iron hydrotalcite / carbon black composite material is obtained;

[0053] S3, the copper iron hydrotalcite / carbon black composite material is calcined in a hydrogen atmosphere, the calcination temperature is 700 DEG C, the calcination time is 2h, after cooling, grinding through a 400 mesh sieve, the modified carbon black composite material is obtained.

[0054] Example 3

[0055] A preparation method of a high-conductivity carbon brush material, comprising the following steps:

[0056] Put 50 parts of flake graphite powder, 25 parts of expanded graphite, 26 parts of copper powder, 10 parts of pitch powder, 5 parts of modified carbon black composite material, 3 parts of carboxymethyl cellulose and 3 parts of sulfur powder into a mixer and mix uniformly, stir at 80℃ for 1h, then crush, the obtained powder is sieved through a 200 mesh sieve to obtain a fine powder, the obtained fine powder is pressed in a mold, after demolding, a blank is obtained, then sintering at 800℃ for 60min, and pressing under a pressure of 180MPa to obtain a high conductivity carbon brush material;

[0057] The preparation method of the modified carbon black composite material is as follows:

[0058] S1, 3g of zirconium oxychloride is added to 100mL of 10wt% hydrochloric acid solution, then 6g of carbon black is added, stirred uniformly, the pH of the solution is adjusted to 10, and continues to stir for 2h, then filtered, dried, calcined under nitrogen atmosphere, the calcination temperature is 550℃, the calcination time is 5h, after cooling, grind through a 400 mesh sieve to obtain a carbon black composite material;

[0059] S2, 10g of copper chloride and 8g of iron chloride are dissolved in 100mL of deionized water, then 12g of carbon black composite material and 1.5g of cetyltrimethylammonium bromide are added, stirred uniformly, then nitrogen is introduced to remove air, 1mol / L NaOH solution is added dropwise under stirring, the pH of the solution is adjusted to 10, after the dropwise addition is completed, continue to stir for 2h, put into an 80℃ oven for aging for 16h, then wash, vacuum dry to obtain a copper-iron hydrotalcite / carbon black composite material;

[0060] S3, the copper-iron hydrotalcite / carbon black composite material is calcined in a hydrogen atmosphere, the calcination temperature is 750℃, the calcination time is 3h, after cooling, grind through a 400 mesh sieve to obtain a modified carbon black composite material.

[0061] Example 4

[0062] A preparation method of a high conductivity carbon brush material, comprising the following steps:

[0063] Put 48 parts of flake graphite powder, 16 parts of expanded graphite, 28 parts of copper powder, 6 parts of pitch powder, 6 parts of modified carbon black composite material, 1 part of carboxymethyl cellulose and 2 parts of sulfur powder into a mixer and mix uniformly, stir at 80℃ for 1h, then crush, the obtained powder is sieved through a 200 mesh sieve to obtain a fine powder, the obtained fine powder is pressed in a mold, after demolding, a blank is obtained, then sintering at 850℃ for 60min, and pressing under a pressure of 170MPa to obtain a high conductivity carbon brush material;

[0064] The preparation method of the modified carbon black composite material is as follows:

[0065] S1, 2.5 g of zirconium oxychloride is added into 100 mL of 10 wt% hydrochloric acid solution, then 5 g of carbon black is added, stirred uniformly, the pH of the solution is adjusted to 10, stirring is continued for 1 h, then after filtration, drying, calcination under nitrogen atmosphere, the calcination temperature is 600℃, the calcination time is 2 h, after cooling, grinding through a 400 mesh sieve, carbon black composite material is obtained;

[0066] S2, 8 g of copper chloride and 8 g of iron chloride are dissolved in 100 mL of deionized water, then 10 g of carbon black composite material and 1 g of cetyltrimethylammonium bromide are added, stirred uniformly, then nitrogen is introduced to remove air, 1 mol / L NaOH solution is added dropwise under stirring, the pH of the solution is adjusted to 12, after the dropwise addition is completed, stirring is continued for 2 h, it is placed in an 80℃ oven for aging for 12 h, then after washing, vacuum drying, copper-iron hydrotalcite / carbon black composite material is obtained;

[0067] S3, the copper-iron hydrotalcite / carbon black composite material is calcined in a hydrogen atmosphere, the calcination temperature is 700℃, the calcination time is 3 h, after cooling, grinding through a 400 mesh sieve, modified carbon black composite material is obtained.

[0068] Comparative Example 1

[0069] A preparation method of a high-conductivity carbon brush material, comprising the following steps:

[0070] 45 parts of flake graphite powder, 20 parts of expanded graphite, 25 parts of copper powder, 8 parts of pitch powder, 8 parts of carbon black, 2 parts of carboxymethyl cellulose and 2 parts of sulfur powder are put into a mixer and mixed uniformly, stirred at 60℃ for 2 h, then pulverized, the obtained powder is sieved through a 200 mesh sieve to obtain micro powder, the obtained micro powder is pressed in a mold, after demolding, a blank is obtained, then sintered at 800℃ for 45 min, and pressed into a shape under a pressure of 160 MPa, thereby a high-conductivity carbon brush material is obtained;

[0071] Comparative Example 1 and Example 1 are compared, and the carbon black is not modified.

[0072] Comparative Example 2

[0073] A preparation method of a high-conductivity carbon brush material, comprising the following steps:

[0074] 45 parts of flake graphite powder, 20 parts of expanded graphite, 25 parts of copper powder, 8 parts of pitch powder, 8 parts of carbon black, 2 parts of carboxymethyl cellulose and 2 parts of sulfur powder are put into a mixer and mixed uniformly, stirred at 60℃ for 2 h, then pulverized, the obtained powder is sieved through a 200 mesh sieve to obtain micro powder, the obtained micro powder is pressed in a mold, after demolding, a blank is obtained, then sintered at 800℃ for 45 min, and pressed into a shape under a pressure of 160 MPa, thereby a high-conductivity carbon brush material is obtained;

[0075] The preparation method of the modified carbon black composite material is as follows:

[0076] 2g of zirconium oxychloride is added into 100mL of 10wt% hydrochloric acid solution, then 6g of carbon black is added, stirred uniformly, the pH of the solution is adjusted to 10, stirring is continued for 2h, then filtering, drying, calcining under nitrogen atmosphere, the calcining temperature is 600℃, the calcining time is 3h, after cooling, grinding through 400 mesh sieve, the modified carbon black composite material is obtained.

[0077] In comparison with Example 1, only the carbon black is treated with zirconium oxide loading in Comparative Example 2.

[0078] Comparative Example 3

[0079] A preparation method of a high-conductivity carbon brush material, comprising the following steps:

[0080] 45 parts of flake graphite powder, 20 parts of expanded graphite, 25 parts of copper powder, 8 parts of pitch powder, 8 parts of modified carbon black composite material, 2 parts of carboxymethyl cellulose and 2 parts of sulfur powder are put into a mixer and mixed uniformly, stirring at 60℃ for 2h, then pulverizing, the obtained powder is sieved through 200 mesh sieve to obtain micro powder, the obtained micro powder is pressed in a mold, after demolding, a blank is obtained, then sintering at 800℃ for 45min, and pressing into shape under a pressure of 160MPa, a high-conductivity carbon brush material is obtained.

[0081] The preparation method of the modified carbon black composite material is as follows:

[0082] S1, 2g of zirconium oxychloride is added into 100mL of 10wt% hydrochloric acid solution, then 6g of carbon black is added, stirred uniformly, the pH of the solution is adjusted to 10, stirring is continued for 2h, then filtering, drying, calcining under nitrogen atmosphere, the calcining temperature is 600℃, the calcining time is 3h, after cooling, grinding through 400 mesh sieve, a carbon black composite material is obtained.

[0083] S2, 8g of copper chloride is dissolved in 100mL of deionized water, then 10g of carbon black composite material and 1g of cetyltrimethylammonium bromide are added, stirred uniformly, then nitrogen is introduced to remove air, under stirring, 1mol / L NaOH solution is added dropwise, the pH of the solution is adjusted to 10, after the dropwise addition is completed, stirring is continued for 2h, then it is placed in an 80℃ oven for aging for 12h, then it is washed, vacuum dried, and a copper hydroxide / carbon black composite material is obtained.

[0084] S3, the copper hydroxide / carbon black composite material is calcined in a hydrogen atmosphere, the calcining temperature is 650℃, the calcining time is 3h, after cooling, grinding through 400 mesh sieve, a modified carbon black composite material is obtained.

[0085] In comparison with Example 1, no iron is loaded in Comparative Example 3.

[0086] The samples prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests, as follows:

[0087] Resistivity test: tested according to the standard JB / T 8133.2-2013;

[0088] Rockwell hardness test: tested according to the standard JB / T 8133.3-2013;

[0089] Electric friction test: the motor rotor was used to rub against the carbon brush, the carbon brush was rubbed against the rotor for 100 hours continuously at a current density of 67 A / cm 2 , a contact pressure of 0.23 MPa, and a rotor rotating speed of 1000 r / min, and then the length dimension wear of the carbon brush was measured;

[0090] The test results are shown in the following table:

[0091]

[0092]

[0093] Finally, it should be noted that the above examples do not limit the present application in any form. For those skilled in the art, some modifications and improvements can be made on the basis of the present application. Therefore, any modification or improvement made without departing from the spirit of the present application shall fall within the scope of the present application.

Claims

1. A high conductivity carbon brush material, characterized by, The raw material is composed of the following components in parts by weight: flake graphite powder 40-50 parts, expanded graphite 15-25 parts, copper powder 25-30 parts, pitch powder 5-10 parts, modified carbon black composite material 5-10 parts, carboxymethyl cellulose 1-3 parts, sulfur powder 2-4 parts; The preparation method of the modified carbon black composite material is as follows: S1, zirconium oxychloride is added to a hydrochloric acid solution, then carbon black is added, stirring is uniformly carried out, the pH of the solution is adjusted to 9-10, stirring is continuously carried out for 1-3 h, then filtration, drying, calcination under a nitrogen atmosphere, and grinding after cooling are carried out, and the carbon black composite material is obtained after sieving; S2, copper salt and iron salt are dissolved in deionized water, then the carbon black composite material and cetyltrimethylammonium bromide are added, stirring is uniformly carried out, then nitrogen is introduced to remove air, NaOH solution is added dropwise under stirring, the pH of the solution is adjusted to 10-12, stirring is continuously carried out for 1-3 h after the dropwise addition is completed, aging is carried out in an oven, and copper-iron hydrotalcite / carbon black composite material is obtained after washing and vacuum drying; S3, the copper-iron hydrotalcite / carbon black composite material is calcined in a reducing atmosphere, and the modified carbon black composite material is obtained after cooling and sieving.

2. The high conductivity carbon brush material of claim 1, wherein, In step S1, the mass ratio of zirconium oxychloride to carbon black is 2-3:5-8.

3. The high conductivity carbon brush material of claim 1, wherein, In step S1, the calcination temperature is 500-600 DEG C, and the calcination time is 2-5 h.

4. The high conductivity carbon brush material of claim 1, wherein, In step S2, the mass ratio of copper salt, iron salt, carbon black composite material and cetyltrimethylammonium bromide is 8-12:6-8:10-15:1-2.

5. The high conductivity carbon brush material of claim 1, wherein, In step S2, the aging temperature is 60-80 DEG C, and the aging time is 8-16 h.

6. The high conductivity carbon brush material of claim 1, wherein, In step S3, the reducing atmosphere is H2 atmosphere or CO atmosphere.

7. The high conductivity carbon brush material of claim 1 wherein, In step S3, the calcination temperature is 650-750 DEG C, and the calcination time is 2-4 h.

8. The method of producing a high conductivity carbon brush material according to any one of claims 1 to 7, wherein The following steps are included: each raw material is put into a mixer in parts by weight and mixed uniformly, stirring is carried out at 60-80 DEG C for 1-2 h, then the obtained powder is crushed, the powder is sieved through a 200-mesh screen to obtain a fine powder, the obtained fine powder is pressed in a mold, the blank is obtained after demolding, then sintering is carried out at 800-850 DEG C for 30-60 min, and the high-conductivity carbon brush material is obtained after pressing under a pressure of 160-180 MPa.

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