CN102263349A - Electric brush made of copper-graphite composite material and used for motor - Google Patents
Electric brush made of copper-graphite composite material and used for motor Download PDFInfo
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- CN102263349A CN102263349A CN2011101561739A CN201110156173A CN102263349A CN 102263349 A CN102263349 A CN 102263349A CN 2011101561739 A CN2011101561739 A CN 2011101561739A CN 201110156173 A CN201110156173 A CN 201110156173A CN 102263349 A CN102263349 A CN 102263349A
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Abstract
The invention discloses a low-cost high-performance electric brush made of copper-graphite composite material. The electric brush is manufactured through the steps of: firstly stirring and mixing raw materials of graphite powder, copper powder, silicon powder and asphalt binder, then pressing and finally sintering according to the copper-graphite electric brush process of the traditional powder metallurgy. In the invention, the process and material costs are low, the performance of the electric brush is obviously improved, and the use requirements of the electric brush for reversers and collector rings of motors can be satisfied.
Description
Technical field
The invention belongs to the contact material field, be specifically related to a kind of motor copper graphite composite material brush.
Background technology
Copper graphite composite material brush is mainly used in the collector ring and the commutator of automobile, aviation, electric utility milking generator, AC asynchronous motor collector ring and commutator, automobile, motorcycle starter and synchronous machine.Matrix copper plays conduction mutually respectively and improves the resistance to wear and the requirement in useful life with graphite in the copper graphite composite material brush, but with traditional powder metallurgical technique, there is contradiction between the two, promptly by improving copper content in the brush, can improve the requirement of conductivity, but resistance to wear and useful life are reduced, and vice versa.Be electrical property and the resistance to wear that obtains, patent CN1213876A (Wu Yuying, Zhang Guoding, big vast Qin, Xiao Xueming, high-strength, brush for electromachine and manufacture method thereof, 1999, CN1213876A) a kind of high-performance copper/silver-graphite brush is disclosed, but its copper facing of adopting/silver-colored graphite powder is done raw material, and cost is very high.Patent CN101379680A discloses a kind of motor, and (holt is rich, the manufacture method of metal-graphite brush material for motor, 2009 with copper graphite brush, CN101379680A), at copper powder is 45wt%, and its resistivity and wear extent can reach 0.012 μ Ω m and 0.2mm/500h respectively, but its copper powder mass number height, and rated current, rotating speed is on the low side, only be 10A and 3.6m/s, and its manufacturing process complexity, adopt hydrogen to do reducing gas, not only cost is very high, and dangerous.
Summary of the invention
The object of the present invention is to provide a kind of motor copper graphite composite material brush, the present invention with silicon as the alloy constituent element, adopt prior powder metallurgy manufactured copper electrographite brush technology, improve the conductivity and the resistance to wear of the copper graphite composite material brush that contains high volume graphite mark simultaneously.
For achieving the above object, copper graphite composite material brush of the present invention contains 50～80 parts of graphite powders, 20～50 electrolytic copper powders, 0.4～1.7 part of silica flour and 5～20 parts of asphalt powders by mass fraction.
Above raw material is evenly mixed by traditional powder metallurgy manufactured copper electrographite brush technology, and compacting, sintering promptly can be made into.
The purity of described graphite powder is 99.9%, and granularity is less than 300 orders.
The purity of described electrolytic copper powder is 99.5%, and granularity is less than 400 orders.
The purity of described silica flour is 95%, and granularity is less than 300 orders.
The granularity of described asphalt powder is less than 400 orders.
The present invention adopts silicon that copper, graphite composite material are carried out alloying, and it is solid-solubilized in copper, the graphite material fully, and it is poly-partially that it is produced at copper, graphite interface place.Because the distinctive semi-conductor electricity minor structure that silicon has, it not only can strengthen the wettability between graphite and copper, and can change the outer-shell electron band structure of copper and graphite at the interface, make the electronics can be, thereby strengthen conductive capability between the two from the easier arrival graphite of copper.Therefore, by the alloying measure, in the situation that does not reduce the brush electrical property, can improve the mass fraction of graphite, simultaneously, copper also can improve the hardness of matrix copper behind alloying with silicon.Because the raising of mass content of graphite and the increase of copper hardness, thus the resistance to wear of copper graphite brush and life-span also just obtained corresponding raising.
Description of drawings
Fig. 1 is the sem photograph of copper graphite composite material brush of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Embodiment 1: is 99.9% by mass fraction with 50 parts purity, granularity is 99.5% less than 300 purpose graphite powders, 25 parts purity, granularity is 95% less than 400 purpose electrolytic copper powders, 0.4 part purity, granularity mixes less than 400 purpose asphalt powders less than 300 purpose silica flours and 7 parts of granularities, evenly mix by traditional powder metallurgy manufactured copper electrographite brush technology then, compacting, sintering promptly can be made into.Its its resistivity is 0.41 μ Ω m after tested, and Rockwell hardness is 96.8, and at 15m/s, wear rate is 0.06mm/50h in peripheral speed, and coefficient of friction is 0.20, and a pair of brush stagnation pressure is reduced to 1.92V, and nominal current density is 15A/cm
2
Embodiment 2: is 99.9% by mass fraction with 80 parts purity, granularity is 99.5% less than 300 purpose graphite powders, 50 parts purity, granularity is 95% less than 400 purpose electrolytic copper powders, 1.5 parts purity, granularity mixes less than 400 purpose asphalt powders less than 300 purpose silica flours and 18 parts of granularities, evenly mix by traditional powder metallurgy manufactured copper electrographite brush technology then, compacting, sintering promptly can be made into.Its its resistivity is 0.09 μ Ω m after tested, and Rockwell hardness is 90, and at 15m/s, wear rate is 0.06mm/50h in peripheral speed, and coefficient of friction is 0.21, and a pair of brush stagnation pressure is reduced to 0.5V, and nominal current density is 20A/cm
2
Embodiment 3: is 99.9% by mass fraction with 60 parts purity, granularity is 99.5% less than 300 purpose graphite powders, 35 parts purity, granularity is 95% less than 400 purpose electrolytic copper powders, 1.0 parts purity, granularity mixes less than 400 purpose asphalt powders less than 300 purpose silica flours and 13 parts of granularities, evenly mix by traditional powder metallurgy manufactured copper electrographite brush technology then, compacting, sintering promptly can be made into.Its its resistivity is 8.9 μ Ω m after tested, and Rockwell hardness is 69.2, and at 15m/s, wear rate is 0.03mm/50h in peripheral speed, and coefficient of friction is 0.20, and a pair of brush stagnation pressure is reduced to 2.8V, and nominal current density is 15A/cm
2
Embodiment 4: is 99.9% by mass fraction with 70 parts purity, granularity is 99.5% less than 300 purpose graphite powders, 40 parts purity, granularity is 95% less than 400 purpose electrolytic copper powders, 1.7 parts purity, granularity mixes less than 400 purpose asphalt powders less than 300 purpose silica flours and 20 parts of granularities, evenly mix by traditional powder metallurgy manufactured copper electrographite brush technology then, compacting, sintering promptly can be made into.
Embodiment 5: is 99.9% by mass fraction with 55 parts purity, granularity is 99.5% less than 300 purpose graphite powders, 20 parts purity, granularity is 95% less than 400 purpose electrolytic copper powders, 0.7 part purity, granularity mixes less than 400 purpose asphalt powders less than 300 purpose silica flours and 5 parts of granularities, evenly mix by traditional powder metallurgy manufactured copper electrographite brush technology then, compacting, sintering promptly can be made into.
Embodiment 6: is 99.9% by mass fraction with 65 parts purity, granularity is 99.5% less than 300 purpose graphite powders, 30 parts purity, granularity is 95% less than 400 purpose electrolytic copper powders, 1.2 parts purity, granularity mixes less than 400 purpose asphalt powders less than 300 purpose silica flours and 10 parts of granularities, evenly mix by traditional powder metallurgy manufactured copper electrographite brush technology then, compacting, sintering promptly can be made into.
As seen from Figure 1, defective is not seen in the copper graphite brush densification.
The present invention is owing to need not change traditional powder metallurgy manufactured copper electrographite brush technology, only in mixed processes, insert the silica flour of the pure level of commercially available analysis, so brush has material and technology is with low cost, and physical and mechanical properties and runnability improve significantly, its peripheral speed is at 15m/s, its resistivity is 0.08～9.0 μ Ω m, Rockwell hardness is 67～105, wear rate is 0.02mm～0.15mm/50h, coefficient of friction is 0.2～0.25, a pair of brush stagnation pressure is reduced to 0.3～3.0V, and nominal current density can be at 12～25A/cm according to the copper mass in the brush
2The interval variation.
Claims (5)
1. copper graphite composite material brush is characterized in that: contain 50～80 parts of graphite powders, 20～50 electrolytic copper powders, 0.4～1.7 part of silica flour and 5～20 parts of asphalt powders by mass fraction.
2. copper graphite composite material brush according to claim 1 is characterized in that: the purity of described graphite powder is 99.9%, and granularity is less than 300 orders.
3. copper graphite composite material brush according to claim 1 is characterized in that: the purity of described electrolytic copper powder is 99.5%, and granularity is less than 400 orders.
4. copper graphite composite material brush according to claim 1 is characterized in that: the purity of described silica flour is 95%, and granularity is less than 300 orders.
5. copper graphite composite material brush according to claim 1, it is characterized in that: the granularity of described asphalt powder is less than 400 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101561739A CN102263349A (en) | 2011-06-10 | 2011-06-10 | Electric brush made of copper-graphite composite material and used for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101561739A CN102263349A (en) | 2011-06-10 | 2011-06-10 | Electric brush made of copper-graphite composite material and used for motor |
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| Publication Number | Publication Date |
|---|---|
| CN102263349A true CN102263349A (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101561739A Pending CN102263349A (en) | 2011-06-10 | 2011-06-10 | Electric brush made of copper-graphite composite material and used for motor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103682925A (en) * | 2013-12-10 | 2014-03-26 | 常熟柏科汽车零件再制造有限公司 | Motor electric brush |
| CN107617748A (en) * | 2017-08-30 | 2018-01-23 | 昆明理工大学 | A kind of preparation method of copper/graphite sliding material |
| CN108907205A (en) * | 2018-07-03 | 2018-11-30 | 大同新成新材料股份有限公司 | A kind of manufacturing process of brush in composite material |
| CN113185292A (en) * | 2021-04-27 | 2021-07-30 | 宜宾学院 | Production method of extrusion-molded copper graphite material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4101453A (en) * | 1976-03-20 | 1978-07-18 | Lucas Industries Limited | Sintered composition |
| JPS5526022A (en) * | 1978-08-10 | 1980-02-25 | Mabuchi Motor Co Ltd | Compact dc motor |
| CN1330724A (en) * | 1998-12-16 | 2002-01-09 | 维多利亚铁路公司 | Low resisting materials with improved wear performance for electrical current transfer and methods for preparing same |
| CN1469514A (en) * | 2002-06-06 | 2004-01-21 | 东炭化工株式会社 | Carbno brush |
| CN101297462A (en) * | 2005-11-10 | 2008-10-29 | 株式会社美姿把 | Carbon brush of motor and method for producing the same |
-
2011
- 2011-06-10 CN CN2011101561739A patent/CN102263349A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4101453A (en) * | 1976-03-20 | 1978-07-18 | Lucas Industries Limited | Sintered composition |
| JPS5526022A (en) * | 1978-08-10 | 1980-02-25 | Mabuchi Motor Co Ltd | Compact dc motor |
| CN1330724A (en) * | 1998-12-16 | 2002-01-09 | 维多利亚铁路公司 | Low resisting materials with improved wear performance for electrical current transfer and methods for preparing same |
| CN1469514A (en) * | 2002-06-06 | 2004-01-21 | 东炭化工株式会社 | Carbno brush |
| CN101297462A (en) * | 2005-11-10 | 2008-10-29 | 株式会社美姿把 | Carbon brush of motor and method for producing the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103682925A (en) * | 2013-12-10 | 2014-03-26 | 常熟柏科汽车零件再制造有限公司 | Motor electric brush |
| CN107617748A (en) * | 2017-08-30 | 2018-01-23 | 昆明理工大学 | A kind of preparation method of copper/graphite sliding material |
| CN108907205A (en) * | 2018-07-03 | 2018-11-30 | 大同新成新材料股份有限公司 | A kind of manufacturing process of brush in composite material |
| CN113185292A (en) * | 2021-04-27 | 2021-07-30 | 宜宾学院 | Production method of extrusion-molded copper graphite material |
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Application publication date: 20111130 |