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WO2021260771A1 - Matériau de graphite métallique et brosse électrique - Google Patents

Matériau de graphite métallique et brosse électrique Download PDF

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Publication number
WO2021260771A1
WO2021260771A1 PCT/JP2020/024414 JP2020024414W WO2021260771A1 WO 2021260771 A1 WO2021260771 A1 WO 2021260771A1 JP 2020024414 W JP2020024414 W JP 2020024414W WO 2021260771 A1 WO2021260771 A1 WO 2021260771A1
Authority
WO
WIPO (PCT)
Prior art keywords
mass
resin
particle size
electric brush
copper
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2020/024414
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English (en)
Japanese (ja)
Inventor
直明 志村
信史 稲田
浩一 上田
吉弘 小池
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Resonac Corp
Original Assignee
Showa Denko Materials Co Ltd
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 Showa Denko Materials Co Ltd filed Critical Showa Denko Materials Co Ltd
Priority to PCT/JP2020/024414 priority Critical patent/WO2021260771A1/fr
Publication of WO2021260771A1 publication Critical patent/WO2021260771A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/05—Alloys based on copper with manganese as the next major constituent
    • 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 disclosure relates to metallic graphitic materials and electric brushes.
  • Recent DC motors are designed to be smaller and lighter by increasing the speed and current density.
  • this type of electric motor has a large deterioration in rectification performance, output characteristics, etc., and also has a large amount of wear on the electric brush, resulting in short durability.
  • electric brushes used in automobile starter motors are required to have durability, impact resistance, corrosion resistance, low electric loss, low resistance and the like.
  • Japanese Patent Publication No. 58-029586 uses an electric brush containing copper and graphite as main components and molybdenum disulfide, lead and the like added thereto.
  • Japanese Patent Publication No. 60-013382 discloses a method of adding a hard polishing substance such as silicon carbide to an electric brush to impart a cleaning action to the commutator surface. ..
  • Japanese Patent No. 2570888 discloses a method of adding boron carbide as a hard abrasive substance to an electric brush to impart a cleaning action to the commutator surface.
  • Japanese Patent Application Laid-Open No. 2004-119203 discloses a method of adding a copper-manganese alloy to an electric brush to impart a cleaning action to the commutator surface.
  • the electric brush to which a hard abrasive substance is added disclosed in Japanese Patent Publication No. 60-013382 has a problem that it is difficult to select the optimum addition amount and particle size of the hard abrasive substance because of its strong cleaning action. ..
  • Unevenness may occur, which may cause problems such as deterioration of motor output, increase of contact voltage drop, and increase of electric brush wear.
  • a blackened film may be formed, unevenness and roughness may occur, and problems such as a contact voltage drop and an increase in brush wear may occur.
  • a blackened film may be formed, unevenness and roughness may occur, and problems such as a contact voltage drop and an increase in brush wear may occur.
  • One form of the present disclosure is made in view of the above-mentioned conventional circumstances, and is a metallic graphitic material capable of reducing a contact voltage drop, reducing wear of the electric brush itself, and forming an electric brush having excellent durability. And, it is an object of the present invention to provide an electric brush formed by using this metallic graphitic material.
  • Main components are at least one of copper and silver and resin-treated graphite. Further, 0.2% by mass to 5% by mass of solid lubricant, 0.2% by mass to 5% by mass of zinc, 0.03% by mass to 2% by mass of boron carbide, and 0.1% by mass to 0.1% by mass.
  • a metallic graphite material containing 3% by mass of a copper-manganese alloy and 0.2% by mass to 4% by mass of a phosphorus-copper alloy.
  • the mass-based content ratio of the resin-treated graphite to the total amount of copper and silver is 90:10 to 20:80 in ⁇ 1>.
  • the metallic graphitic material of the description ⁇ 3> The metallic graphitic material according to ⁇ 1> or ⁇ 2>, wherein the resin-treated graphite contains a phenol resin.
  • the electric brush according to ⁇ 4> used as an electric brush for a starter motor.
  • a metallic graphite material capable of reducing a contact voltage drop, reducing wear of the electric brush itself to form a highly durable electric brush, and using this metallic graphite material. It is possible to provide an electric brush formed by the above.
  • the term "process” includes, in addition to a process independent of other processes, the process as long as the purpose of the process is achieved even if it cannot be clearly distinguished from the other process. ..
  • the numerical range indicated by using "-" includes the numerical values before and after "-" as the minimum value and the maximum value, respectively.
  • the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in another stepwise description. ..
  • the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
  • each component may contain a plurality of applicable substances.
  • the content or content of each component is the total content or content of the plurality of substances present in the composition unless otherwise specified.
  • the particles corresponding to each component may contain a plurality of types of particles.
  • the particle size of each component means a value for a mixture of the plurality of particles present in the composition unless otherwise specified.
  • the term "layer” or “membrane” is used only in a part of the region, in addition to the case where the layer or the membrane is formed in the entire region when the region is observed. The case where it is formed is also included.
  • the average particle size of each particle is the particle size (D50) when the accumulation from the small diameter side is 50% in the volume-based particle size distribution measured by the laser diffraction method.
  • the metallic graphitic material of the present disclosure contains at least one of copper and silver (hereinafter, copper and silver may be collectively referred to as a specific metal) and resin-treated graphite as main components, and further has a mass of 0.2. % To 5% by mass of solid lubricant, 0.2% to 5% by mass of silver, 0.03% to 2% by mass of boron carbide, and 0.1% to 3% by mass of copper. It contains a manganese alloy and 0.2% by mass to 4% by mass of a phosphorus-copper alloy.
  • the metallic graphitic material of the present disclosure may contain other components, if necessary.
  • the metallic graphitic material of the present disclosure it is possible to reduce the contact voltage drop, reduce the wear of the electric brush itself, and form an electric brush having excellent durability.
  • various components contained in the metallic graphitic material of the present disclosure will be described in detail.
  • the inclusion of the specified metal and the resin-treated graphite as the "main component” means that the total amount of the specified metal and the resin-treated graphite in the metallic graphitic material is 50% by mass or more.
  • the content of each component is a ratio to the entire metallic graphitic material.
  • the metallic graphitic material of the present disclosure contains at least one of a specific metal.
  • the specific metal is preferably in the form of metal powder.
  • the metal powder include copper powder and silver powder, and copper powder is preferable from the viewpoint of manufacturing cost, and electrolytic copper powder is more preferable.
  • the average particle size of the metal powder is preferably 5 ⁇ m to 75 ⁇ m, more preferably 10 ⁇ m to 60 ⁇ m, and more preferably 15 ⁇ m in terms of improving the output of the motor and improving the mechanical strength. It is more preferably ⁇ 55 ⁇ m.
  • the surface of the metal powder may be coated with a resin.
  • the resin for coating is not particularly limited as long as there is no problem in the performance of the electric brush when the metal graphite material is used as the electric brush.
  • the resin for coating include epoxy resin, phenol resin, furan resin, urea resin, melamine resin and the like. Among these, it is preferable to use an epoxy resin or a phenol resin.
  • the means for coating the surface of the metal powder with the resin is not particularly limited, and the surface of the metal powder can be coated with the resin by applying, spraying, dipping or impregnating the resin for coating. Among these, it is preferable to coat by the impregnation method in terms of obtaining a more stable coating state.
  • the amount of the resin is preferably 0.05% by mass to 5% by mass, more preferably 0.1% by mass to 3% by mass, based on the mass of the metal powder.
  • the coverage is 0.05% by mass or more, the metal powder is sufficiently covered with the resin and the oxidation of the metal powder tends to be suppressed. Further, when the coverage is 5% by mass or less, the resistance of the electric brush formed by using the metallic graphitic material tends to be suppressed to a low level.
  • the content of the specific metal (when copper and silver are used in combination, the total content of copper and silver) is not particularly limited. From the viewpoint of exhibiting good conductivity, the content of the specific metal is preferably 70% by mass or less, more preferably 60% by mass or less, based on the total mass of the metallic graphite material. It is more preferably 55% by mass or less. From the viewpoint of suppressing the blending amount of the specific metal and exhibiting the required conductivity, the content of the specific metal is preferably 20% by mass or more with respect to the total mass of the metallic graphite material.
  • the mass-based content ratio (resin-treated graphite: total amount of specific metal) between the total amount of resin-treated graphite and specific metal is the performance as an electric brush, the required strength of the electric brush, etc. From the viewpoint of the above, 90:10 to 20:80 is preferable, 70:30 to 25:75 is more preferable, and 60:40 to 30:70 is even more preferable.
  • the metallic graphitic material of the present disclosure contains resin-treated graphite. Since the metallic graphitic material contains resin-treated graphite, it is possible to reduce the amount of electric brush wear due to the improvement of the electric brush strength.
  • Resin-treated graphite can be obtained, for example, by kneading a composition containing graphite and a binder resin and then granulating the composition.
  • a kneading method a usual method can be used.
  • the composition may contain a solid lubricant, a curing agent, a plasticizer and the like described later, if necessary.
  • the type of graphite used as a raw material for the resin-treated graphite is not particularly limited, and may be natural graphite or artificial graphite. Of these, natural graphite, which is superior in lubricity with developed crystals, is preferable. As for graphite, only one kind may be used, or two or more kinds may be used in combination.
  • the binder resin used as a raw material for the resin-treated graphite is not particularly limited, and examples thereof include phenol resin, furan resin, urea resin, melamine resin, and epoxy resin. Among these, a phenol resin is preferable as the binder resin.
  • resin-treated graphite containing the phenol resin can be obtained.
  • the phenol resin may be a resol resin or a novolak resin, or a resol resin and a novolak resin may be mixed and used.
  • the resol resin and the novolak resin may be in any state such as liquid, solid, and powder.
  • a modified phenol resin modified with various modifiers can be used according to the characteristics required for the resin-treated graphite.
  • the modified phenol resin include resorsin-modified phenol resin, cresol-modified phenol resin, alkyl-modified phenol resin, cashew-modified phenol resin, aromatic hydrocarbon resin-modified phenol resin, melamine-modified phenol resin, oil-modified phenol resin, furan-modified phenol resin, and the like.
  • examples thereof include rosin-modified phenolic resin and terpene-modified phenolic resin.
  • the content of graphite in the resin-treated graphite is preferably 50% by mass to 95% by mass, preferably 60% by mass to 90% by mass, from the viewpoint of performance and material strength when used in an electric brush. It is more preferably 70% by mass to 85% by mass.
  • the average particle size of graphite is preferably 10 ⁇ m to 400 ⁇ m, more preferably 15 ⁇ m to 300 ⁇ m, and even more preferably 20 ⁇ m to 200 ⁇ m.
  • the average particle size of the resin-treated graphite is not particularly limited, and is preferably 20 ⁇ m to 750 ⁇ m, more preferably 30 ⁇ m to 500 ⁇ m.
  • the resin-treated graphite two or more kinds of resin-treated graphite having different average particle diameters may be used in combination.
  • a resin-treated graphite having an average particle diameter of more than 200 ⁇ m and a resin-treated graphite having an average particle diameter of 200 ⁇ m or less may be combined.
  • the proportion of the resin-treated graphite having an average particle diameter of more than 200 ⁇ m is preferably 25% by mass to 75% by mass, and 30% by mass to 70% by mass of the whole resin-treated graphite. Is more preferable, and 35% by mass to 65% by mass is further preferable.
  • the metallic graphitic material of the present disclosure contains a solid lubricant.
  • the content of the solid lubricant in the metallic graphite material is 0.2% by mass to 5% by mass, preferably 1% by mass to 4% by mass, and 1.5% by mass to 3.5% by mass. Is more preferable.
  • the solid lubricant may be contained in the metallic graphite material, may be contained in the composition for coating the resin-treated graphite, or may not be contained in the composition.
  • metal sulfide solid lubricants such as molybdenum disulfide and tungsten disulfide, boron nitride and the like are preferable from the viewpoint of lubricity, and among these, the metal sulfide solid lubricant is more preferable, and molybdenum disulfide is more preferable. Is even more preferable.
  • the average particle size of the metal sulfide solid lubricant is not particularly limited, and is preferably 0.5 ⁇ m to 50 ⁇ m, preferably 3 ⁇ m to 40 ⁇ m. Is more preferable.
  • the metallic graphitic material of the present disclosure contains zinc.
  • the content of zinc in the metallic graphite material is 0.2% by mass to 5% by mass, preferably 0.3% by mass to 4% by mass, and 1% by mass to 3.5% by mass. Is more preferable.
  • the zinc content is 0.2% by mass or more, it tends to be possible to suppress a decrease in the output of an electric motor provided with an electric brush formed by using a metallic graphite material.
  • the zinc content is 5% by mass or less, the life of the electric brush formed by using the metallic graphite material can be extended, and the commutator wear and the occurrence of roughness tend to be suppressed. ..
  • the average particle size of zinc is preferably 1 ⁇ m to 100 ⁇ m, more preferably 10 ⁇ m to 60 ⁇ m.
  • the metallic graphitic material of the present disclosure contains boron carbide.
  • the content of boron carbide in the metallic graphite material is 0.03% by mass to 2% by mass, preferably 0.05% by mass to 2% by mass, and 0.1% by mass to 2% by mass. It is more preferable to have.
  • the content of boron carbide is 0.03% by mass or more, the wear reducing effect of the electric brush formed by using the metallic graphitic material tends to be improved.
  • the content of boron carbide is 2% by mass or less, the wear of the electric brush formed by using the metallic graphite material can be reduced, and the wear of the commutator and the occurrence of roughness tend to be suppressed.
  • the particle size of boron carbide is not particularly limited, and for example, the average particle size is preferably 1 ⁇ m to 100 ⁇ m, and more preferably 10 ⁇ m to 50 ⁇ m. There is no particular limitation on the composition ratio of carbon atom and boron atom in boron carbide.
  • the metallic graphitic material of the present disclosure contains a copper-manganese alloy.
  • the content of the copper-manganese alloy in the metallic graphite material is 0.1% by mass to 3% by mass, preferably 0.2% by mass to 3% by mass, and 0.5% by mass to 2. It is more preferably 5% by mass.
  • the wear reducing effect of the electric brush formed by using the metallic graphitic material tends to be improved.
  • the particle size of the copper-manganese alloy is not particularly limited, and for example, the average particle size is preferably 1 ⁇ m to 30 ⁇ m, and more preferably 5 ⁇ m to 20 ⁇ m. There is no particular limitation on the composition ratio of copper atoms and manganese atoms in the copper-manganese alloy.
  • the metallic graphitic material of the present disclosure contains a phosphorus-copper alloy.
  • the content of the phosphorus-copper alloy in the metallic graphite material is 0.2% by mass to 4% by mass, preferably 0.2% by mass to 3% by mass, and 0.5% by mass to 3% by mass. % Is more preferable.
  • the content of the phosphorus-copper alloy is 0.2% by mass or more, the wear reducing effect of the electric brush formed by using the metallic graphitic material tends to be improved.
  • the particle size of the phosphorus-copper alloy is not particularly limited, and for example, the average particle size is preferably 5 ⁇ m to 100 ⁇ m, and more preferably 30 ⁇ m to 90 ⁇ m. There is no particular limitation on the component ratio of phosphorus atom and copper atom in the phosphorus-copper alloy.
  • Examples of other components contained in the metallic graphitic material of the present disclosure as required include a mold release agent and the like.
  • examples thereof include amide, ethylene bisstearic acid amide, stearic acid monoglyceride, stearyl stearate, and hardened oil. Only one type of release agent may be used, or two or more types may be used in combination.
  • the content of the mold release agent may be 0.01% by mass to 1.5% by mass.
  • the electric brush of the present disclosure may be formed by using the metallic graphitic material of the present disclosure, or may be formed by using each component constituting the metallic graphite material of the present disclosure. good.
  • the electric brush of the present disclosure can suppress the contact voltage drop by reducing the amount of the blackening film formed on the commutator surface while suppressing the roughness of the commutator surface, and is excellent in motor output.
  • the electric brush is used, for example, as an electric brush for a starter motor.
  • the metallic graphite material of the present disclosure is formed and pressed at a pressure of about 200 MPa to 400 MPa, and then sintered in a reducing atmosphere (for example, at 600 ° C. to 800 ° C. for 1 hour to 10 hours). , May be manufactured by machining to a predetermined shape and size.
  • the electric brush of the present disclosure includes specific metals constituting the metallic graphite material of the present disclosure, resin-treated graphite, solid lubricant, zinc, boron carbide, copper-manganese alloy and phosphorus-copper alloy, and if necessary.
  • molding and pressing are performed at a pressure of about 200 MPa to 400 MPa, and then sintering is performed in a reducing atmosphere containing hydrogen or the like (for example, 600 ° C. to 600 ° C.). It may be manufactured by machining at 800 ° C. for 1 to 10 hours) and machining it into a predetermined shape and size.
  • this resin-treated graphite 49.63% by mass, 50% by mass of electrolytic copper powder having an average particle size of 35 ⁇ m, 0.1% by mass of molybdenum disulfide having an average particle size of 5 ⁇ m, and copper-manganese having an average particle size of 15 ⁇ m.
  • 0.05% by mass of alloy 0.1% by mass of phosphorus-copper alloy with an average particle size of 70 ⁇ m, 0.02% by mass of boron carbide with an average particle size of 20 ⁇ m, and 0.1% by mass of zinc with an average particle size of 30 ⁇ m.
  • the obtained mixed powder was molded by a molding press with a copper stranded wire with a pigtail at a molding pressure of 392 MPa, heated to 700 ° C. in a reducing atmosphere containing hydrogen in 3 hours, and held at 700 ° C. for 1 hour. And heat-treated. Then, it was machined into a predetermined shape to obtain an electric brush.
  • Example 1 Resin-treated graphite 41.5% by mass, electrolytic copper powder with an average particle size of 35 ⁇ m 50% by mass, molybdenum disulfide 2% by mass with an average particle size of 5 ⁇ m, copper-manganese alloy with an average particle size of 15 ⁇ m 2% by mass, average Weigh 2% by mass of a phosphorus-copper alloy having a particle size of 70 ⁇ m, 0.5% by mass of boron carbide having an average particle size of 20 ⁇ m, and 2% by mass of zinc having an average particle size of 30 ⁇ m. After that, I got an electric brush.
  • Example 2 Resin-treated graphite 41% by mass, electrolytic copper powder with an average particle size of 35 ⁇ m 50% by mass, molybdenum disulfide 3% by mass with an average particle size of 5 ⁇ m, copper-manganese alloy with an average particle size of 15 ⁇ m 1% by mass, average particle size Weighs 1% by mass of a phosphorus-copper alloy having a particle size of 70 ⁇ m, 1% by mass of boron carbide having an average particle size of 20 ⁇ m, and 3% by mass of zinc having an average particle size of 30 ⁇ m. Obtained.
  • Example 3 Resin-treated graphite 38% by mass, electrolytic copper powder 50% by mass with an average particle size of 35 ⁇ m, molybdenum disulfide 3% by mass with an average particle size of 5 ⁇ m, copper-manganese alloy 2% by mass with an average particle size of 15 ⁇ m, average particle size Weighs 2% by mass of a phosphorus-copper alloy having a particle size of 70 ⁇ m, 2% by mass of boron carbide having an average particle size of 20 ⁇ m, and 3% by mass of zinc having an average particle size of 30 ⁇ m. Obtained.
  • Example 4 Resin-treated graphite 37% by mass, electrolytic copper powder with an average particle size of 35 ⁇ m 50% by mass, molybdenum disulfide 4% by mass with an average particle size of 5 ⁇ m, copper-manganese alloy with an average particle size of 15 ⁇ m 3% by mass, average particle size Weighs 1% by mass of a phosphorus-copper alloy having a particle size of 70 ⁇ m, 1% by mass of boron carbide having an average particle size of 20 ⁇ m, and 4% by mass of zinc having an average particle size of 30 ⁇ m. Obtained.
  • a sliding test was carried out by applying an electric current to the electric brushes obtained in Examples 1 to 4 and Comparative Examples 1 to 7.
  • the test conditions were a Cu slip ring with a diameter of 30 mm, a current of 30 A / cm 2 , a rotation speed of 10000 min -1 (rpm), a spring pressure of 2 kg / cm 2 , and sliding for 200 hours.
  • the amount of wear and the surface roughness of the slip ring (ring roughness) were determined.
  • the results are shown in Table 1.
  • the amount of electric brush wear was defined as the amount of change in the length of the electric brush before and after the sliding test.
  • the slip ring surface roughness (ring roughness) was measured using a surface roughness measuring machine manufactured by Mitutoyo Co., Ltd.
  • the sweep distance was 7 mm
  • the sweep speed was 0.5 mm / s
  • the sweep direction was perpendicular to the sliding direction.
  • the contact voltage drop was measured by measuring the potential difference between the two electric brushes during the sliding test.
  • the electric brushes of Examples 1 to 4 have a lower contact voltage drop than the electric brushes of Comparative Examples 1 to 7, and reduce electric brush wear and commutator wear (ring roughness). It is clear to do.
  • the electric brush of the embodiment is an electric brush having excellent durability that reduces a contact voltage drop and reduces wear of the electric brush itself, and is extremely suitable industrially.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)

Abstract

Ce matériau de graphite métallique contient un graphite traité par une résine et au moins un élément parmi le cuivre et l'argent en tant que composants principaux, et contient en outre 0,2 à 5 % en masse d'un lubrifiant solide, 0,2 à 5 % en masse de plomb, 0,03 à 2 % en masse de carbure de bore, 0,1 à 3 % en masse d'un alliage cuivre-manganèse, et 0,2 à 4 % en masse d'un alliage phosphore-cuivre.
PCT/JP2020/024414 2020-06-22 2020-06-22 Matériau de graphite métallique et brosse électrique Ceased WO2021260771A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0438152A (ja) * 1990-06-01 1992-02-07 Hitachi Chem Co Ltd 電刷子
JPH077892A (ja) * 1993-06-21 1995-01-10 Hitachi Chem Co Ltd 金属黒鉛電刷子
JP2017118620A (ja) * 2015-12-22 2017-06-29 日立化成株式会社 摺動部材形成材料及び摺動部材
JP2018087110A (ja) * 2016-11-29 2018-06-07 日立化成株式会社 金属黒鉛質材料及び金属黒鉛質ブラシ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0438152A (ja) * 1990-06-01 1992-02-07 Hitachi Chem Co Ltd 電刷子
JPH077892A (ja) * 1993-06-21 1995-01-10 Hitachi Chem Co Ltd 金属黒鉛電刷子
JP2017118620A (ja) * 2015-12-22 2017-06-29 日立化成株式会社 摺動部材形成材料及び摺動部材
JP2018087110A (ja) * 2016-11-29 2018-06-07 日立化成株式会社 金属黒鉛質材料及び金属黒鉛質ブラシ

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