WO2018135162A1 - Brosse en graphite-cuivre - Google Patents

Brosse en graphite-cuivre Download PDF

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Publication number
WO2018135162A1
WO2018135162A1 PCT/JP2017/043752 JP2017043752W WO2018135162A1 WO 2018135162 A1 WO2018135162 A1 WO 2018135162A1 JP 2017043752 W JP2017043752 W JP 2017043752W WO 2018135162 A1 WO2018135162 A1 WO 2018135162A1
Authority
WO
WIPO (PCT)
Prior art keywords
mass
brush
copper
graphite
bending strength
Prior art date
Application number
PCT/JP2017/043752
Other languages
English (en)
Japanese (ja)
Inventor
加央理 赤瀬
Original Assignee
トライス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by トライス株式会社 filed Critical トライス株式会社
Priority to CN201780071558.0A priority Critical patent/CN109983140A/zh
Priority to JP2018563201A priority patent/JPWO2018135162A1/ja
Publication of WO2018135162A1 publication Critical patent/WO2018135162A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation

Definitions

  • This invention relates to a copper graphite brush.
  • the present invention relates to the improvement of the mechanical strength of a brush for a DC motor that is widely used as a sliding member for industrial machines, and particularly to the improvement of the bending strength.
  • a copper graphite brush having slidability and conductivity is used as a brush for a DC motor.
  • the graphite contained in the copper-graphite brush has an effect of improving the slidability when the sliding surface wears and forms a carbon film on the sliding surface when sliding on the counterpart material. Further, copper is excellent in conductivity, is moderately soft, can hardly damage the counterpart material, and can improve conductivity without impairing slidability.
  • the brush for the DC motor has the brush tip in contact with the sliding surface in a pressurized state inside the motor, so that pressure (load) is applied to the brush and the DC motor is used for a long time. There is concern about the occurrence of sliding failure due to the effect of the effect. For this reason, it is desirable that the brush for the DC motor has a high bending strength, and a brush capable of stably maintaining the high bending strength is required particularly in a high temperature environment.
  • Patent Document 1 JP2002-80922 describes graphite: 10 to 30 mass%, hexagonal boron nitride: 0.5 to 4 mass%, Ag: 0.2 to 1.5 mass%, and the balance Cu (64.5 to 89.3 mass%).
  • a quality brush is disclosed. In order to improve the bending strength, this brush has a skeleton structure of Cu phase extending in the direction intersecting the sliding surface, so the Cu ratio in the brush is increased, and the content of graphite responsible for slidability is 10-30 mass It has become smaller with%.
  • expensive hexagonal boron nitride and Ag are contained.
  • Patent Document 2 discloses blending a resin such as polyethylene, polypropylene, and polystyrene into a copper graphite brush and thermally decomposing the resin during firing.
  • a certain degree of bending strength 13 MPa is obtained by bonding graphite particles with thermally decomposed resin.
  • higher bending strength may be required.
  • the conductivity of the surface of the sliding part may deteriorate.
  • An object of the present invention is to obtain a copper graphite brush having a stable bending strength over a long period of time in a high temperature environment in a copper graphite brush used for a DC motor.
  • This invention is a copper-graphite brush containing copper and graphite, characterized in that it contains a boron compound of 0.1 mass% or more and 2.0 mass% or less in terms of B 2 O 3 as boron oxide or boric acid. .
  • the boron oxide is, for example, B 2 O 3 , but may include B 2 O 2 , B 4 O 3 , B 4 O 5 and the like.
  • Boric acid is, for example, H 3 BO 3 , HBO 2 , H 2 B 4 O 7 or the like. Boric acid easily changes to B 2 O 3 at 300 ° C. or higher, and boric acid may change to boron oxide by heating during firing.
  • B 2 O 3 is a typical boron oxide, but may be partially reduced during firing and may contain B 2 O 2 or the like.
  • boron oxide may absorb moisture and change into boric acid.
  • boron oxide and boric acid are substances that can change from each other, and there is no significance in distinguishing them.
  • Boron oxide, boric acid and the like may contain impurities such as Na ions.
  • the boron compound content is determined in terms of B 2 O 3 .
  • H 3 BO 3 has a melting point of 184 ° C.
  • H 2 B 4 O 7 has a melting point of 140 ° C.
  • B 2 O 3 having a higher melting point has a melting point of 577 ° C.
  • the boron compound melts during firing and acts as a kind of binder, which improves the bending strength of the copper graphite brush.
  • boron oxide and boric acid are collectively referred to as a boron compound, and the content of the boron compound is shown in terms of B 2 O 3 .
  • the copper graphite brush is sometimes simply called a brush.
  • the content of the boron compound in the brush is 0.1 mass% or more and 2.0 mass% or less, the bending strength after firing is high, and the change in bending strength is small even when used at high temperatures.
  • the boron compound content is 3.0 mass% or more, the brush surface is uneven, but when it is 2.0 mass% or less, the appearance is not a problem. 3 shows the brush surface when the boron compound content is 0.8 mass%, FIG.
  • FIG. 4 shows the brush surface when the boron compound content is 3 mass%
  • FIG. 5 shows the boron compound content is 7 mass%.
  • the brush surface is shown.
  • corrugation considered to originate in a boron compound is seen on the brush surface.
  • the sliding action derived from graphite is enhanced, and expensive lubricants such as hexagonal boron nitride and Ag are not required.
  • the kind of graphite is arbitrary, such as artificial graphite and natural graphite.
  • amorphous carbon derived from thermosetting resins such as phenol resins or thermoplastic resins is not included in graphite.
  • the brush may contain impurities such as amorphous carbon such as coke, solid lubricant such as molybdenum disulfide and tungsten disulfide, other additives, and ash.
  • the graphite content is less than 35 mass%, the sliding action is deteriorated, which is not desirable. On the other hand, if the graphite content exceeds 80 mass%, the amount of electrolytic copper powder may be reduced and conductivity may be deteriorated. Copper and graphite are the main components of the brush, and the copper content is, for example, 15 mass% or more and 63 mass% or less.
  • Copper is not limited to pure copper but may be brass or the like as long as it contains a copper element.
  • the electrolytic copper powder has a dendritic shape, and the copper powder is entangled with each other to obtain high conductivity.
  • the particle size of the copper powder is not particularly limited, but those having a particle size of 10 ⁇ m or more and 100 ⁇ m or less are used. Note that the particle shape of the electrolytic copper powder is not lost even after firing.
  • the content of the boron compound is preferably 0.1 mass% or more and 1.0 mass% or less, and most preferably 0.5 mass% or more and 1.0 mass% or less in terms of B 2 O 3 .
  • the content of the boron compound is 0.5 mass% or more, the bending strength is high and the change with time at high temperature is also small.
  • the content of the boron compound is 2.0 mass%, the bending strength at a high temperature changes more greatly than the case where the bending strength is high but 1.0 mass% or less.
  • it is less than 0.1 mass% an effect will become small for the improvement of a bending strength, and if it exceeds 2.0 mass%, an external appearance will deteriorate.
  • the boron compound is present in the brush in the form of particles in principle. Note that this does not exclude that a part of the boron compound exists in a form other than the particulate form.
  • the boron compound since the boron compound was blended as a powder of boric acid or the like, the existence form after firing should be in the form of particles.
  • the boron compound particle grains which the distribution of a boron element and oxygen element correspond, and are independent of the distribution of a copper element exist in a brush. Since copper and graphite are in the form of particles in the brush, the copper, graphite, and boron compound are each present in the form of particles in the brush. *
  • a copper graphite brush having a high bending strength and a bending strength that hardly changes with time even at a high temperature can be obtained.
  • FIG. 1 of the brush embodiment of the copper-graphite brush 2 indicates, 4 in the sliding surface of the sliding partner 8 such as commutator, the brush 2 is provided with a lead wire 6, Pressure is applied toward the sliding surface 4 in the direction of the arrow in the figure.
  • the brush 2 may be a single layer, two layers, or three layers. In the case of multiple layers, it is sufficient that a predetermined amount of a boron compound is contained in any layer.
  • Phenol resin dissolved in methanol is mixed with natural scaly graphite, uniformly kneaded with a mixer, dried with a dryer, pulverized with an impact pulverizer, and sieved with an 80 mesh pass. Sieving with (198 ⁇ m pass sieve) to obtain resin-treated graphite powder.
  • Electrolytic copper powder (average particle size 40 ⁇ m), boric acid (H 3 BO 3 ) powder, and molybdenum disulfide are added to the resin-treated graphite powder, and mixed with a V-type mixer to obtain a blended powder. It was. H 3 BO 3 may be changed to other boric acid such as H 2 B 4 O 7 or may be changed to boron oxide such as B 2 O 3. The boron compound is blended as a powder.
  • Molybdenum disulfide may be replaced with other solid lubricants such as tungsten disulfide, and may contain other components.
  • the graphite content is 35 mass% or more from the viewpoint of lubricity, and accordingly, the Cu content is preferably 64 mass% or less, and the Cu content is 19 mass% or more from the viewpoint of conductivity, and accordingly the graphite content is included.
  • the amount is preferably 80 mass% or less.
  • the compounded powder is put into the mold from the hopper and molded at a pressure of 4 ⁇ 10 8 Pa (48 ⁇ 9800 N / cm 2 ) so as to embed the tip of the lead wire 6, and at 700 ° C. in a reducing atmosphere electric furnace Sintering was performed to obtain a brush having the composition shown in Table 1.
  • the firing temperature is preferably 600 ° C to 1000 ° C.
  • FIG. 2 shows an EPMA (Electron Probe Micro Analysis) image of the brush cut surface in Example 6.
  • the distribution of B element and the distribution of O element are almost the same, but not the distribution of Cu element. This indicates that boron exists in the form of particles as boron oxide or boric acid. This also corresponds to the incorporation of boron as boric acid (H 3 BO 3 ).
  • FIG. 3 is a photograph showing the brush surface of Example 4
  • FIG. 4 is a photograph showing the brush surface of Comparative Example 2
  • FIG. 5 is a photograph showing the brush surface of Comparative Example 4.
  • the brush in the photograph is a test piece prepared by the manufacturing method described in the above example, and the dimensions are 20 mm ⁇ 10 mm ⁇ 5 mm.
  • the boron content in terms of B 2 O 3 is 0.1 to 2 mass%
  • the brush surface is smooth and can be used as it is.
  • the comparative example where the boron content is 3 to 7 mass%, Possible lumps appear and the surface is uneven. And since this lump is easy to fall off during use of a brush, the comparative example whose boron content is 3 mass% or more is not practical.
  • the brush resistivity and the like were in a range where there was no practical problem.
  • the bending strength of the brush after firing and the bending strength after aging at 200 ° C. for 100 hours and after aging at 200 ° C. for 400 hours were measured.
  • the bending strength is a three-point bending strength.
  • Table 2 shows the evaluation results of the bending strength and the appearance of the brush. *
  • Table 2 shows the following.
  • the boron compound concentration in terms of B 2 O 3 is less than 0.1 mass%, the bending strength of the brush is insufficient. If it is 0.1 mass% or more and less than 0.5 mass%, the bending strength is improved but slightly low. In the range of 0.5 mass% to 1.0 mass%, the bending strength is high, and the change with time in bending strength at high temperatures is small. If it is more than 1.0 mass% and not more than 2.0 mass%, the bending strength is high, but the change with time in the bending strength at a high temperature becomes slightly large. If it exceeds 2.0 mass%, it cannot be used due to poor appearance, and cracking may occur during the time-lapse test. For these reasons, the boron compound content is 0.1 mass% or more and 2.0 mass% or less, preferably 0.1 mass% or more and 1.0 mass% or less, and most preferably 0.5 mass% or more and 1.0 mass% or less.
  • the copper graphite brush for a DC motor according to the present invention has high bending strength and small change with time at high temperature, so that the characteristics can be maintained for a long time. For this reason, it can be suitably used for sliding members that are used for a long period of time at high temperatures, such as automobile motors, alternators and the like.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

L'invention concerne une brosse en graphite-cuivre contenant, de l'ordre de 0,1 à 2,0 % en masse exprimé en tant que B2O3, un composé de bore se présentant sous la forme d'oxyde de bore ou d'acide boracique.
PCT/JP2017/043752 2017-01-19 2017-12-06 Brosse en graphite-cuivre WO2018135162A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780071558.0A CN109983140A (zh) 2017-01-19 2017-12-06 铜石墨刷
JP2018563201A JPWO2018135162A1 (ja) 2017-01-19 2017-12-06 銅黒鉛質ブラシ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-007278 2017-01-19
JP2017007278 2017-01-19

Publications (1)

Publication Number Publication Date
WO2018135162A1 true WO2018135162A1 (fr) 2018-07-26

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PCT/JP2017/043752 WO2018135162A1 (fr) 2017-01-19 2017-12-06 Brosse en graphite-cuivre

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JP (1) JPWO2018135162A1 (fr)
CN (1) CN109983140A (fr)
WO (1) WO2018135162A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002080922A (ja) * 2000-09-07 2002-03-22 Mitsubishi Materials Corp 耐摩耗性のすぐれたＣｕ−黒鉛系焼結材製摺動集電材
JP2006187190A (ja) * 2004-11-30 2006-07-13 Denso Corp ブラシ、整流子及び整流機構
JP2011212691A (ja) * 2010-03-31 2011-10-27 Jfe Steel Corp 細径多電極サブマージアーク溶接用フラックス入り溶接ワイヤ
WO2016010104A1 (fr) * 2014-07-17 2016-01-21 トライス株式会社 Balai de carbone stratifié pour moteur de pompe à carburant

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1988622A1 (fr) * 2006-02-24 2008-11-05 Aisin Seiki Kabushiki Kaisha Procédé de production de matière de balai de graphite métallisé pour moteur
CN101656385B (zh) * 2009-10-20 2011-01-05 丽水市长新电器制造有限公司 超耐磨全能纳米碳刷及其制备方法
CN102142650B (zh) * 2010-11-30 2013-11-20 施丽萍 纳米稀土复合高耐磨电刷添加剂及其制备方法
CN102130407B (zh) * 2010-12-24 2012-08-22 苏州东南碳制品有限公司 一种卡车起动电机用碳刷及其制造方法和应用
JP6456142B2 (ja) * 2012-06-18 2019-01-23 東洋炭素株式会社 金属炭素質ブラシおよびその製造方法
CN103972758A (zh) * 2014-03-05 2014-08-06 台州昊泽碳制品有限公司 一种低噪音的电机电刷组合物
CN105098561B (zh) * 2014-05-04 2018-12-18 苏州东南碳制品有限公司 一种混合动力汽车起动电机用碳刷的制备方法及其应用
CN106159623B (zh) * 2014-12-31 2018-10-09 上海摩腾碳制品有限公司 一种风力发电机专用碳刷及其制备方法
CN104901120A (zh) * 2015-04-14 2015-09-09 芜湖中源赛特管业有限公司 石墨电刷及其制备方法
CN104804371A (zh) * 2015-04-14 2015-07-29 芜湖中源赛特管业有限公司 石墨电刷及其制备方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002080922A (ja) * 2000-09-07 2002-03-22 Mitsubishi Materials Corp 耐摩耗性のすぐれたＣｕ−黒鉛系焼結材製摺動集電材
JP2006187190A (ja) * 2004-11-30 2006-07-13 Denso Corp ブラシ、整流子及び整流機構
JP2011212691A (ja) * 2010-03-31 2011-10-27 Jfe Steel Corp 細径多電極サブマージアーク溶接用フラックス入り溶接ワイヤ
WO2016010104A1 (fr) * 2014-07-17 2016-01-21 トライス株式会社 Balai de carbone stratifié pour moteur de pompe à carburant

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CN109983140A (zh) 2019-07-05
JPWO2018135162A1 (ja) 2019-11-07

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