CN111559914A - Carbon block with long service life and preparation process thereof - Google Patents
Carbon block with long service life and preparation process thereof Download PDFInfo
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- CN111559914A CN111559914A CN202010452370.4A CN202010452370A CN111559914A CN 111559914 A CN111559914 A CN 111559914A CN 202010452370 A CN202010452370 A CN 202010452370A CN 111559914 A CN111559914 A CN 111559914A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
Abstract
The invention discloses a carbon block with long service life and a preparation process thereof. The technical problem is that the long-term friction easily causes the carbon brush to generate sparks in the friction process, thereby reducing the service life of the carbon block; the carbon block is prepared from the following raw materials in parts by weight: natural graphite, carbon powder, adhesive, carbon black, expanded graphite and flame retardant powder; the preparation method comprises the following steps: mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite and flame retardant powder in proportion, and heating and stirring; after stirring, cooling the mixed raw materials, crushing and sieving; pressing and molding the crushed and sieved mixed raw materials, and sintering at high temperature to prepare a semi-finished product; and (4) soaking and cooling the semi-finished product sintered at the high temperature, and machining after cooling to obtain a finished product. The carbon block can be used as a carbon body substrate of a carbon brush, and the occurrence of sparks is reduced in the using process, so that the service life of the carbon block is prolonged; in addition, the preparation method has the advantages of simple process and easy operation.
Description
Technical Field
The invention relates to the field of carbon brush materials, in particular to a carbon block with long service life and a preparation process thereof.
Background
Carbon brushes, also called brushes, are widely used as sliding contacts in many electrical devices, and carbon blocks are used as carbon substrates of carbon brushes.
Patent document CN1956280A discloses a carbon brush which generates less radio interference, comprising a carbon-based material and an additive containing a metal or an inorganic material, formed by kneading graphite powder and a binder and heat-treating the binder.
The carbon block is used as a carbon body base material of the carbon brush and is positioned between a fixed part and a rotating part of the rotating machine, and the carbon block is needed to be improved because the carbon block is rubbed for a long time and the rotating machine is mostly made of metal materials, so that sparks are easily generated in the carbon brush in the rubbing process, and the service life of the carbon block is shortened.
Disclosure of Invention
In view of the disadvantages of the prior art, the first object of the present invention is to provide a carbon block with long service life, which has the advantage of improving the service life of the carbon block.
The second purpose of the invention is to provide a carbon block preparation process with long service life, which has the advantages of simple process and easy operation.
In order to achieve the first object, the invention provides the following technical scheme: a carbon block with long service life is prepared from the following raw materials in parts by weight: 10-20 parts of natural graphite, 35-40 parts of carbon powder, 30-40 parts of adhesive, 2-5 parts of carbon black, 2-5 parts of expanded graphite and 2-5 parts of flame retardant powder.
By adopting the technical scheme, the raw materials of the carbon block are added with the bonding agent, and meanwhile, the carbon block prepared by taking the natural graphite as the raw material has good lubricating property and current collecting property; the expanded graphite has the excellent performances of cold and heat resistance, corrosion resistance, self-lubrication and the like of the natural graphite, and also has the characteristics of softness, compression resilience, adsorbability, ecological environment harmony, biocompatibility, radiation resistance and the like which are not possessed by the natural graphite; the addition of the flame retardant powder stabilizes the sparking state of the carbon block during friction, so that slight burn exists on the surface of the carbon block after long-term friction, the resistivity and the abrasion loss of the carbon block are reduced, and the service life of the carbon block is prolonged.
Further, the natural graphite consists of T75 graphite and 399 graphite powder, and the weight part ratio of the T75 graphite to the 399 graphite powder is 1: 2.
By adopting the technical scheme, the 399 graphite powder has high graphite purity, complete crystalline flake, thin flake, good tolerance, good temperature resistance, self-lubricating property, conductivity and the like; and the T75 graphite is natural flake graphite, the graphite reaches 80%, the fineness is 200#, the flake size is: 200# with certain self-lubricating property; the material of the natural graphite is limited in proportion, so that the lubricity of the carbon block is improved, the abrasion loss is reduced, and the service life of the carbon block is further prolonged.
Further, the adhesive is asphalt, artificial resin or tar.
By adopting the technical scheme, the asphalt has certain viscosity, so that various raw materials are bonded, and meanwhile, the asphalt also has high-temperature resistance, low price and easily available raw materials; the artificial resin is often used as an adhesive of various materials and is softened by heating; the tar is used as an industrial adhesive and has good adhesive effect.
Further, the raw material of the carbon block also comprises a lubricant, and the weight part of the lubricant is 3-5 parts.
By adopting the technical scheme, the lubricant is added into the raw materials of the carbon block, so that the spark state during friction is improved to a certain extent, the abrasion loss and the resistivity of the carbon block are reduced, and the service life of the carbon block is prolonged.
Further, the lubricant is tungsten disulfide or molybdenum disulfide.
By adopting the technical scheme, the tungsten disulfide is fine crystal or powder with gray ribbon metal luster, belongs to a hexagonal system, and has semiconductivity and diamagnetism; the natural mineral is wolframite, has a layered structure, is easy to dissociate, and has lubricating property similar to graphite; molybdenum disulfide is an important solid lubricant, is especially suitable for high temperature and high pressure, has diamagnetism, can be used as a linear photoconductor and a semiconductor for displaying P-type or N-type conductivity, and has rectification and transduction functions.
Further, the raw materials comprise, by weight, 12-18 parts of natural graphite, 37-39 parts of carbon powder, 33-35 parts of adhesive, 2-4 parts of carbon black, 2-4 parts of expanded graphite and 2-4 parts of flame retardant powder.
By adopting the technical scheme, the range of the weight parts of the raw materials is further reduced, so that the physical performance of the prepared carbon block is improved, the preparation amount of the carbon block of the next time is reduced, and the energy waste is reduced.
In order to achieve the second object, the invention provides the following technical scheme: the preparation process of the carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring;
s2, after stirring, crushing the mixed raw materials after cooling, and sieving the crushed mixed raw materials;
s3, pressing and molding the crushed and sieved mixed raw materials, and sintering at high temperature to prepare a semi-finished product;
and S4, soaking and cooling the semi-finished product sintered at high temperature, and machining after cooling to obtain the finished product.
By adopting the technical scheme, fewer process steps are adopted, the preparation process of the carbon block is simplified, the preparation of the carbon block is easier to operate, and the method has the advantages of simple process and easy operation.
Further, in the step S1, the temperature during heating and stirring is controlled to 80-100 ℃.
Through adopting above-mentioned technical scheme, heat the stirring process to control heating temperature, make each raw materials evenly mix together fast, thereby improved the efficiency of stirring.
Further, in the step S2, the standard of the sieving is 90-110 meshes.
By adopting the technical scheme, the crushed mixed raw materials are sieved, and the sieving standard is limited, so that the particle size of the crushed and sieved mixed raw materials is uniform, the surface of a finished carbon block manufactured in the later period is smooth, and the abrasion loss of the carbon block is reduced.
Further, in the step S3, the temperature during high-temperature sintering is controlled at 2500 ℃, and the high-temperature sintering time is 8-10 h.
By adopting the technical scheme, the temperature during high-temperature sintering is controlled, so that the sintered semi-finished carbon block has excellent physical properties.
In conclusion, the invention has the following beneficial effects:
firstly, the addition of the flame retardant powder stabilizes the sparking state of the carbon block during friction, so that slight burn exists on the surface of the carbon block after long-term friction, the resistivity and the abrasion loss of the carbon block are reduced, and the service life of the carbon block is prolonged.
Secondly, the lubricant is added into the raw materials of the carbon block, so that the spark state during friction is improved to a certain extent, the abrasion loss and the resistivity of the carbon block are reduced, and the service life of the carbon block is prolonged.
Thirdly, the method of the invention has fewer process steps, simplifies the preparation process of the carbon block, enables the preparation of the carbon block to be easier to operate, and has the advantages of simple process and easy operation.
Detailed Description
The present invention will be described in further detail with reference to examples.
Examples
Table 1 shows the proportions of the carbon block raw materials.
| Ratio 1 | Ratio 2 | Ratio 3 | Ratio 4 | Ratio 5 | |
| Natural graphite | 10 | 12 | 15 | 18 | 20 |
| Carbon powder | 35 | 37 | 38 | 39 | 40 |
| Adhesive agent | 30 | 33 | 34 | 35 | 40 |
| Carbon black | 2 | 2.5 | 3 | 4 | 5 |
| Expanded graphite | 2 | 2.5 | 3 | 4 | 5 |
| Flame-retardant powder | 2 | 2.5 | 3 | 4 | 5 |
| Lubricant agent | 3 | 3.5 | 4 | 4.5 | 5 |
TABLE 1
Example 1 (ratio of raw materials selected 1):
a preparation process of a carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring the raw materials by a mixer; the temperature during heating and stirring is controlled at 80 ℃, and stirring is carried out for 1 h.
S2, after stirring, cooling the mixed raw materials, crushing by using a crusher, and sieving, wherein the standard of sieving the powdery mixed raw materials is 90 meshes;
s3, pressing and forming the crushed and sieved mixed raw materials, and sintering at high temperature by using a sintering furnace to prepare a semi-finished product; the temperature during high-temperature sintering is controlled at 2000 ℃, and the high-temperature sintering time is 10 h.
And S4, soaking and cooling the semi-finished product sintered at high temperature in a boiler, and machining after cooling to obtain the finished product.
Wherein the natural graphite consists of T75 graphite and 399 graphite powder, and the weight ratio of the T75 graphite to the 399 graphite powder is 1: 2.
The adhesive is selected from asphalt; the lubricant is selected to be tungsten disulfide.
Example 2 (ratio of raw materials selected 1):
a preparation process of a carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring the raw materials by a mixer; the temperature during heating and stirring is controlled at 100 ℃, and stirring is carried out for 1 h.
S2, after stirring, cooling the mixed raw materials, crushing by using a crusher, and sieving, wherein the standard of sieving the powdery mixed raw materials is 110 meshes;
s3, pressing and forming the crushed and sieved mixed raw materials, and sintering at high temperature by using a sintering furnace to prepare a semi-finished product; the temperature during high-temperature sintering is controlled to be 2500 ℃, and the high-temperature sintering time is 8 h.
And S4, soaking and cooling the semi-finished product sintered at high temperature in a boiler, and machining after cooling to obtain the finished product.
Wherein the natural graphite consists of T75 graphite and 399 graphite powder, and the weight ratio of the T75 graphite to the 399 graphite powder is 1: 2.
The adhesive is selected from asphalt; the lubricant is selected to be tungsten disulfide.
Example 3 (ratio of raw materials selected 1):
a preparation process of a carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring the raw materials by a mixer; the temperature during heating and stirring is controlled at 90 ℃, and stirring is carried out for 1 h.
S2, after stirring, cooling the mixed raw materials, crushing by using a crusher, and sieving, wherein the standard of sieving the powdery mixed raw materials is 100 meshes;
s3, pressing and forming the crushed and sieved mixed raw materials, and sintering at high temperature by using a sintering furnace to prepare a semi-finished product; the temperature during high-temperature sintering is controlled at 2250 ℃, and the high-temperature sintering time is 9 h.
And S4, soaking and cooling the semi-finished product sintered at high temperature in a boiler, and machining after cooling to obtain the finished product.
Wherein the natural graphite consists of T75 graphite and 399 graphite powder, and the weight ratio of the T75 graphite to the 399 graphite powder is 1: 2.
The adhesive is selected from asphalt; the lubricant is selected to be tungsten disulfide.
Example 4 (ratio of raw materials selected 2):
a preparation process of a carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring the raw materials by a mixer; the temperature during heating and stirring is controlled at 90 ℃, and stirring is carried out for 1 h.
S2, after stirring, cooling the mixed raw materials, crushing by using a crusher, and sieving, wherein the standard of sieving the powdery mixed raw materials is 100 meshes;
s3, pressing and forming the crushed and sieved mixed raw materials, and sintering at high temperature by using a sintering furnace to prepare a semi-finished product; the temperature during high-temperature sintering is controlled at 2250 ℃, and the high-temperature sintering time is 9 h.
And S4, soaking and cooling the semi-finished product sintered at high temperature in a boiler, and machining after cooling to obtain the finished product.
Wherein the natural graphite consists of T75 graphite and 399 graphite powder, and the weight ratio of the T75 graphite to the 399 graphite powder is 1: 2.
The adhesive is selected from asphalt; the lubricant is selected to be tungsten disulfide.
Example 5 (ratio of raw materials selected 3):
a preparation process of a carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring the raw materials by a mixer; the temperature during heating and stirring is controlled at 90 ℃, and stirring is carried out for 1 h.
S2, after stirring, cooling the mixed raw materials, crushing by using a crusher, and sieving, wherein the standard of sieving the powdery mixed raw materials is 100 meshes;
s3, pressing and forming the crushed and sieved mixed raw materials, and sintering at high temperature by using a sintering furnace to prepare a semi-finished product; the temperature during high-temperature sintering is controlled at 2250 ℃, and the high-temperature sintering time is 9 h.
And S4, soaking and cooling the semi-finished product sintered at high temperature in a boiler, and machining after cooling to obtain the finished product.
Wherein the natural graphite consists of T75 graphite and 399 graphite powder, and the weight ratio of the T75 graphite to the 399 graphite powder is 1: 2.
The adhesive is selected from asphalt; the lubricant is selected to be tungsten disulfide.
Example 6 (ratio of raw materials selected 4):
a preparation process of a carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring the raw materials by a mixer; the temperature during heating and stirring is controlled at 90 ℃, and stirring is carried out for 1 h.
S2, after stirring, cooling the mixed raw materials, crushing by using a crusher, and sieving, wherein the standard of sieving the powdery mixed raw materials is 100 meshes;
s3, pressing and forming the crushed and sieved mixed raw materials, and sintering at high temperature by using a sintering furnace to prepare a semi-finished product; the temperature during high-temperature sintering is controlled at 2250 ℃, and the high-temperature sintering time is 9 h.
And S4, soaking and cooling the semi-finished product sintered at high temperature in a boiler, and machining after cooling to obtain the finished product.
Wherein the natural graphite consists of T75 graphite and 399 graphite powder, and the weight ratio of the T75 graphite to the 399 graphite powder is 1: 2.
The adhesive is selected from asphalt; the lubricant is selected to be tungsten disulfide.
Example 7 (ratio of raw materials selected 5):
a preparation process of a carbon block with long service life comprises the following steps:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring the raw materials by a mixer; the temperature during heating and stirring is controlled at 90 ℃, and stirring is carried out for 1 h.
S2, after stirring, cooling the mixed raw materials, crushing by using a crusher, and sieving, wherein the standard of sieving the powdery mixed raw materials is 100 meshes;
s3, pressing and forming the crushed and sieved mixed raw materials, and sintering at high temperature by using a sintering furnace to prepare a semi-finished product; the temperature during high-temperature sintering is controlled at 2250 ℃, and the high-temperature sintering time is 9 h.
And S4, soaking and cooling the semi-finished product sintered at high temperature in a boiler, and machining after cooling to obtain the finished product.
Wherein the natural graphite consists of T75 graphite and 399 graphite powder, and the weight ratio of the T75 graphite to the 399 graphite powder is 1: 2.
The adhesive is selected from asphalt; the lubricant is selected to be tungsten disulfide.
Comparative example 1
This comparative example differs from example 5 in that no flame retardant powder was added.
Comparative example 2
This comparative example differs from example 5 in that no lubricant was added.
Performance test
Carbon blocks of the same specification were prepared according to the preparation processes of examples 1 to 7 and comparative examples 1 to 2, and physical properties of the carbon blocks were measured according to the following methods, and the test results are shown in table 2:
the test method comprises the following steps:
1. wear loss: selecting carbon blocks with the same specification at room temperature, rubbing the surface of a metal sheet of the same variety and with the same surface friction coefficient back and forth for 500 times, wherein the friction pressure is 10N, weighing the mass of the carbon block without rubbing and the mass of the carbon block after rubbing, and calculating the difference value of the weighed mass of the carbon block twice.
2. Spark condition: and observing the degree of burning marks on the surface of the carbon block after the abrasion loss detection is finished.
3. Resistivity: the carbon block was subjected to resistivity test at room temperature according to JB/T8133.2-2013.
Table 2 shows the results of physical property measurements of carbon blocks of the same specification prepared by the preparation processes of examples 1 to 7 and comparative examples 1 to 2.
| Amount of abrasion (mg) | Spark condition | Resistivity (u Ω m) | |
| Example 1 | 0.34 | Slight burn | 0.51 |
| Example 2 | 0.31 | Slight burn | 0.49 |
| Example 3 | 0.33 | Slight burn | 0.50 |
| Example 4 | 0.23 | Slight burn | 0.39 |
| Example 5 | 0.19 | Slight burn | 0.34 |
| Example 6 | 0.23 | Slight burn | 0.37 |
| Example 7 | 0.30 | Slight burn | 0.51 |
| Comparative example 1 | 0.61 | Obvious scorching | 0.91 |
| Comparative example 2 | 0.79 | Obvious scorching | 0.37 |
TABLE 2
As can be seen from table 2, in comparison with the data of comparative example 1 to example 3, under the condition of the same raw material ratio, the mixed heating temperature and the sintering temperature in the preparation process are changed, and the physical properties of the carbon block are detected, so that the resistivity and the abrasion loss of the carbon block are increased when the mixed heating temperature and the sintering temperature are too high or too low, and the service life of the carbon block is reduced; the sparking condition is slight burn, namely the carbon block prepared by the preparation process of the embodiment 2 has better physical properties.
As can be seen from table 2, in comparison with the data of example 2, example 4 to example 7, the raw material ratio of the carbon block is changed under the condition that various parameters of the preparation process are unified, and by detecting the physical properties of the carbon block, it can be found that the resistivity and the abrasion loss of the carbon block are changed along with the change of the ratio of the preparation raw materials of the carbon block; the carbon block prepared in the raw material proportion of the embodiment 5 has good physical properties, slightly burnt sparks, low resistivity and low abrasion loss, so that the carbon block has long service life.
As can be seen from Table 2, in the data of comparative example 5 and comparative example 1, in comparative example 1, the flame retardant powder was not added as compared with example 5, the resistivity was improved as compared with example 5, the spark condition was also remarkably scorched, and the wear amount was increased in the case where the spark condition was decreased; therefore, the flame retardant powder added into the raw materials of the carbon block can improve the spark state during friction to a certain extent, reduce the abrasion loss and the resistivity of the carbon block and prolong the service life of the carbon block.
As can be seen from Table 2, comparing the data of example 5 and comparative example 2, in comparative example 2, the lubricant was not added as compared with example 5, the resistivity was slightly increased, the spark condition was also remarkably scorched, and the wear amount was also remarkably increased in the case where the spark condition was decreased as compared with example 5; therefore, the lubricant added into the raw materials of the carbon block can improve the spark state during friction to a certain extent, reduce the abrasion loss and the resistivity of the carbon block and prolong the service life of the carbon block.
In conclusion, the carbon block prepared by the preparation process has the advantages of stable spark state, low resistivity and low abrasion loss, the service life of the carbon block is greatly prolonged, and the carbon block prepared in the embodiment 5 has better physical properties.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A carbon block with long service life is characterized in that the carbon block is prepared from the following raw materials in parts by weight: 10-20 parts of natural graphite, 35-40 parts of carbon powder, 30-40 parts of adhesive, 2-5 parts of carbon black, 2-5 parts of expanded graphite and 2-5 parts of flame retardant powder.
2. A carbon block having an extended service life as claimed in claim 1 wherein said natural graphite is comprised of T75 graphite and 399 graphite powder in a ratio of 1: 2 parts by weight of T75 graphite to 399 graphite powder.
3. A carbon block having a long service life as claimed in claim 1 wherein said binder is pitch, synthetic resin or tar.
4. A carbon block having a long service life as claimed in claim 1, wherein said carbon block raw material further comprises lubricant, said lubricant is 3-5 parts by weight.
5. A carbon block having an extended service life as claimed in claim 4 wherein said lubricant is tungsten disulphide or molybdenum disulphide.
6. A carbon block with long service life as claimed in claim 1, wherein the raw materials comprise, by weight, 12-18 parts of natural graphite, 37-39 parts of carbon powder, 33-35 parts of adhesive, 2-4 parts of carbon black, 2-4 parts of expanded graphite and 2-4 parts of flame retardant powder.
7. A process for the preparation of carbon blocks having a long service life according to any one of claims 1 to 6 comprising the steps of:
s1, mixing natural graphite, carbon powder, adhesive, carbon black, expanded graphite, flame retardant powder and lubricant in proportion, and heating and stirring;
s2, after stirring, crushing the mixed raw materials after cooling, and sieving the crushed mixed raw materials;
s3, pressing and molding the crushed and sieved mixed raw materials, and sintering at high temperature to prepare a semi-finished product;
and S4, soaking and cooling the semi-finished product sintered at high temperature, and machining after cooling to obtain the finished product.
8. A process for the preparation of carbon blocks having a long service life as claimed in claim 7, wherein in step S1, the temperature during heating and stirring is controlled to 80-100 ℃.
9. A process for the preparation of long-life carbon blocks as claimed in claim 7 wherein in step S2 the standard of screening is 90-110 mesh.
10. The process for preparing carbon block with long service life as claimed in claim 7, wherein in step S3, the temperature during high temperature sintering is controlled at 2000-2500 ℃, and the high temperature sintering time is 8-10 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259150A (en) * | 2012-02-16 | 2013-08-21 | 苏州东南碳制品有限公司 | Electric brush for electric tool motor and preparation method thereof |
| CN106848792A (en) * | 2016-12-30 | 2017-06-13 | 重庆市河海碳素制品有限公司 | A kind of graphite carbon brush and preparation method thereof |
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2020
- 2020-05-25 CN CN202010452370.4A patent/CN111559914A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259150A (en) * | 2012-02-16 | 2013-08-21 | 苏州东南碳制品有限公司 | Electric brush for electric tool motor and preparation method thereof |
| CN106848792A (en) * | 2016-12-30 | 2017-06-13 | 重庆市河海碳素制品有限公司 | A kind of graphite carbon brush and preparation method thereof |
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| 王文广 主编: "《聚合物改性原理》", 31 March 2018, 中国轻工业出版社 * |
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Application publication date: 20200821 |