WO2023189977A1 - Matériau de frottement - Google Patents

Matériau de frottement Download PDF

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Publication number
WO2023189977A1
WO2023189977A1 PCT/JP2023/011334 JP2023011334W WO2023189977A1 WO 2023189977 A1 WO2023189977 A1 WO 2023189977A1 JP 2023011334 W JP2023011334 W JP 2023011334W WO 2023189977 A1 WO2023189977 A1 WO 2023189977A1
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WO
WIPO (PCT)
Prior art keywords
friction
friction material
mass
natural graphite
sulfide
Prior art date
Application number
PCT/JP2023/011334
Other languages
English (en)
Japanese (ja)
Inventor
博司 山本
素行 宮道
佑亮 大西
浩之 木村
Original Assignee
曙ブレーキ工業株式会社
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 曙ブレーキ工業株式会社 filed Critical 曙ブレーキ工業株式会社
Publication of WO2023189977A1 publication Critical patent/WO2023189977A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing

Definitions

  • the present invention relates to a friction material used for brake pads, brake linings, clutch facings, etc. of automobiles, railway vehicles, industrial machines, etc.
  • Patent Document 1 describes a friction material including a friction modifier, a binder, and a fiber base material, which contains steel fibers as the fiber base material, natural graphite as a lubricant, and a copper content.
  • a friction material is described in which the amount of titanate is 0.5% by mass or less in terms of copper element and does not contain titanate.
  • Creep growl is known as an unpleasant noise other than brake squeal.
  • AT automatic
  • MT manual
  • creep growth tends to occur after a car is left in a high humidity environment such as in the rain or early in the morning, it is thought that moisture is the cause.
  • moisture can cause the friction material and mating material in the brake to become stuck due to rust.
  • Patent Document 1 it is possible to provide a sufficient friction coefficient and suppress brake squeal, but there is room for improvement with respect to creep growth. Furthermore, suppression of rust fixation has not been studied.
  • An object of the present invention is to provide a friction material that maintains a sufficient coefficient of friction and has improved creep growth and rust fixation.
  • the present inventors have found that the above problem can be solved by using coated steel fibers and natural graphite having an average particle diameter within a specific range, and by setting the amount of coated steel fibers within a specific range. That is, the present invention is as follows. [1] A friction material containing a friction modifier, a fiber base material, and a binder, The friction modifier contains natural graphite with an average particle size of 100 to 300 ⁇ m, A friction material containing 15 to 40% by mass of steel fibers coated with metal sulfide as the fiber base material. [2] The friction material according to [1], wherein the metal sulfide contains at least one of iron sulfide and tin sulfide.
  • coated steel fibers and natural graphite with an average particle diameter in a specific range by using coated steel fibers and natural graphite with an average particle diameter in a specific range, and by setting the amount of coated steel fibers within a specific range, a sufficient coefficient of friction is maintained and creep growth and rust fixation are prevented. This makes it possible to provide improved friction materials.
  • the friction material of the present invention contains a friction modifier, a fiber base material, and a binder.
  • the fiber base material is used to reinforce the friction material.
  • the friction material of the present invention contains steel fibers coated with metal sulfide (hereinafter also referred to as "coated steel fibers") as a fiber base material.
  • Metal sulfides function as solid lubricants. As a result, the occurrence of rust on the surface of the friction material can be suppressed more than with ordinary steel fibers that are not coated.
  • metal sulfides include iron sulfide, tin sulfide, copper sulfide, bismuth sulfide, zinc sulfide, tungsten sulfide, manganese sulfide, molybdenum disulfide, antimony trisulfide, etc., and these may be used alone or in combination of two or more. Can be used in combination.
  • the metal sulfide preferably contains at least one of iron sulfide and tin sulfide from the viewpoint of lubricity and environmental impact.
  • the content of the coated steel fibers in the friction material is 15 to 40% by mass, preferably 15 to 30% by mass, and more preferably 15 to 25% by mass. Within this range, it is possible to obtain a friction material that maintains a sufficient coefficient of friction and has improved creep growth and rust fixation.
  • coated steel fiber for example, those described in Japanese Patent Application Publication No. 2019-501303, commercially available products manufactured by Tribotecc, etc. can be used.
  • fiber base material other fiber base materials can be used in addition to the above-mentioned coated steel fibers.
  • fiber base materials various commonly used organic fibers, inorganic fibers, and metal fibers are used, but it is preferable not to use copper fibers or bronze fibers containing a copper component.
  • organic fibers include aromatic polyamide (aramid) fibers and flame-resistant acrylic fibers
  • inorganic fibers include ceramic fibers, biosoluble inorganic fibers, glass fibers, carbon fibers, rock wool, etc.
  • metal fibers include uncoated steel fibers. Each of these may be used alone or in combination of two or more. Further, the content of other fiber base materials in the friction material is preferably 1 to 15% by mass, more preferably 1 to 10% by mass.
  • Friction modifiers are used to impart desired friction properties such as wear resistance, heat resistance, and fade resistance to friction materials.
  • the friction material of the present invention contains natural graphite having an average particle diameter of 100 to 300 ⁇ m as a friction modifier.
  • natural graphite having an average particle diameter of 100 to 300 ⁇ m as a friction modifier.
  • the average particle diameter of natural graphite is preferably 100 to 250 ⁇ m, more preferably 100 to 200 ⁇ m.
  • the content of natural graphite in the friction material is preferably 1 to 3% by mass, more preferably 1 to 2% by mass from the viewpoint of securing a friction coefficient.
  • the friction material of the present invention preferably further contains coke in addition to natural graphite as a friction modifier. This makes it possible to impart appropriate lubricity, suppress the aggressiveness of the abrasive to the mating material, and ensure a good friction coefficient.
  • the total content of natural graphite and coke in the friction material is preferably 5 to 20% by mass, more preferably 10 to 15% by mass, from the viewpoint of ensuring both a friction coefficient and wear resistance.
  • the coke used preferably has an average particle diameter of 200 to 1000 ⁇ m. If the average particle diameter is 200 ⁇ m or more, wear resistance is improved in a high temperature range, and if it is 1000 ⁇ m or less, segregation is less likely to occur and cracking can be suppressed.
  • Coal coke which is made from high-quality coal, is expensive and difficult to use, but petroleum coke has less variation in quality, is inexpensive, and can be easily obtained, so petroleum coke is preferred. is preferred.
  • the average particle diameter can be determined by the value of the particle diameter equivalent to 50% cumulative percentage on a volume basis (D50) measured by a laser diffraction particle size distribution analyzer. Moreover, the average particle diameter can also be measured by a sieving method.
  • friction modifier other friction modifiers other than those mentioned above can be used, such as inorganic fillers, organic fillers, abrasives, solid lubricants, metal powders, and the like.
  • Inorganic fillers include titanates such as potassium titanate, lithium titanate, lithium potassium titanate, sodium titanate, calcium titanate, magnesium titanate, magnesium potassium titanate, barium sulfate, calcium carbonate, calcium hydroxide, Examples include inorganic materials such as vermiculite and mica. Each of these may be used alone or in combination of two or more. Further, the content of the inorganic filler in the friction material is preferably 1 to 50% by mass, more preferably 5 to 40% by mass based on the entire friction material.
  • organic filler examples include various rubber powders (raw rubber powder, tire powder, etc.), cashew dust, melamine dust, and the like. Each of these may be used alone or in combination of two or more. Further, the content of the organic filler in the friction material is preferably 1 to 20% by mass, more preferably 1 to 10% by mass based on the entire friction material.
  • abrasive examples include alumina, silica, magnesium oxide, zirconium oxide, zirconium silicate, chromium oxide, triiron tetroxide (Fe 3 O 4 ), chromite, and the like. Each of these may be used alone or in combination of two or more. Further, the content of the abrasive in the friction material is preferably 1 to 30% by mass, more preferably 5 to 25% by mass based on the entire friction material.
  • solid lubricants examples include antimony trisulfide, molybdenum disulfide, tin sulfide, polytetrafluoroethylene (PTFE), and the like.
  • natural graphite with an average particle size of less than 100 ⁇ m natural graphite with an average particle size of more than 300 ⁇ m
  • artificial graphite can also be used in combination with the above-mentioned natural graphite with an average particle size of 100 to 300 ⁇ m.
  • These solid lubricants may be used alone or in combination of two or more.
  • the content of the solid lubricant in the friction material is preferably 1 to 30% by mass, more preferably 5 to 25% by mass based on the entire friction material.
  • the metal powder examples include powders of aluminum, tin, zinc, and the like. Each of these may be used alone or in combination of two or more. Further, the content of metal powder in the friction material is preferably 1 to 10% by mass, more preferably 1 to 5% by mass based on the entire friction material.
  • the content of the friction modifier in the friction material is preferably 40 to 90% by mass, more preferably 50 to 80% by mass, based on the entire friction material, from the viewpoint of sufficiently imparting the desired friction characteristics to the friction material.
  • binders As the binder contained in the friction material according to the present invention, various commonly used binders can be used. Specifically, thermosetting resins such as straight phenol resins, various modified phenol resins such as elastomers, melamine resins, epoxy resins, and polyimide resins are mentioned. Examples of the elastomer-modified phenol resin include acrylic rubber-modified phenol resin, silicone rubber-modified phenol resin, and nitrile rubber (NBR)-modified phenol resin. Note that these binders can be used alone or in combination of two or more. Further, the content of the binder in the friction material is preferably 1 to 20% by mass, more preferably 3 to 15% by mass based on the entire friction material.
  • the friction material of the present invention does not contain a copper component.
  • "contains no copper component” means that it does not contain a copper component as an active component for exerting functions such as wear resistance.For example, if a friction material contains a small amount of copper component This does not mean that it does not contain copper components as impurities.
  • the copper component mixed as an impurity etc. is 0.5% by mass or less.
  • a specific embodiment of the method for manufacturing the friction material according to the present invention can be carried out by a known manufacturing process.
  • the above components are blended, and the blend is preformed, thermoformed, Friction materials can be produced through processes such as heating and polishing.
  • the general steps in manufacturing brake pads with friction material are shown below.
  • thermoforming step in which the preformed body and the pressure plate coated with adhesive are fixed together by applying a predetermined temperature and pressure (molding temperature: 130-180°C, molding pressure: 30-80 MPa) , molding time 2-10 minutes), (e) After-curing (150-300°C, 1-5 hours) and finally applying finishing treatments such as polishing, surface baking, and painting.
  • Examples 1 to 5, Comparative Examples 1 to 9 Raw materials having a friction material composition shown in Table 2 described below were mixed for 5 minutes in a mixer, the mixed stirring material was put into a mold, and preforming and heating and pressure molding were performed to produce a friction material.
  • the following steel fibers coated with metal sulfide were used.
  • Preforming was carried out by applying a pressure of 20 MPa for 10 seconds.
  • thermoformed product was subjected to heating and pressure molding at a pressure of 35 MPa and a molding temperature of 150° C. for 6 minutes to create a thermoformed product.
  • the thermoformed bodies were subjected to after-curing at a temperature of 250° C. for 3 hours, processed to a predetermined thickness, polished, and painted to produce each friction material.
  • Rust adhesion test The measured adhesion strength was judged based on the following criteria. ⁇ : 0N (no rust adhesion) or more, less than 20N ⁇ : 20N or more, less than 50N ⁇ : 50N or more, less than 100N ⁇ : 100N or more

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

La présente invention concerne un matériau de frottement qui comprend un régulateur de frottement, un matériau de base de fibre et un liant, dans lequel : du graphite naturel ayant un diamètre de particule moyen de 100 µm à 300 µm est contenu en tant que régulateur de frottement ; et 15 % en masse à 40 % en masse de fibres d'acier qui sont recouvertes d'un sulfure métallique sont contenues en tant que matériau de base de fibre.
PCT/JP2023/011334 2022-03-29 2023-03-22 Matériau de frottement WO2023189977A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-054105 2022-03-29
JP2022054105 2022-03-29

Publications (1)

Publication Number Publication Date
WO2023189977A1 true WO2023189977A1 (fr) 2023-10-05

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PCT/JP2023/011334 WO2023189977A1 (fr) 2022-03-29 2023-03-22 Matériau de frottement

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WO (1) WO2023189977A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009126903A (ja) * 2007-11-21 2009-06-11 Akebono Brake Ind Co Ltd 固体潤滑材
JP2009132816A (ja) * 2007-11-30 2009-06-18 Advics Co Ltd 摩擦材
JP2016027086A (ja) * 2014-05-12 2016-02-18 アイティーティー マニュファクチャリング エンタープライジーズ エルエルシー 摩擦材料
JP2019501303A (ja) * 2015-10-20 2019-01-17 トリボテック ゲーエムベーハー トライボロジー用途の繊維
WO2021125143A1 (fr) * 2019-12-19 2021-06-24 曙ブレーキ工業株式会社 Matériau de friction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009126903A (ja) * 2007-11-21 2009-06-11 Akebono Brake Ind Co Ltd 固体潤滑材
JP2009132816A (ja) * 2007-11-30 2009-06-18 Advics Co Ltd 摩擦材
JP2016027086A (ja) * 2014-05-12 2016-02-18 アイティーティー マニュファクチャリング エンタープライジーズ エルエルシー 摩擦材料
JP2019501303A (ja) * 2015-10-20 2019-01-17 トリボテック ゲーエムベーハー トライボロジー用途の繊維
WO2021125143A1 (fr) * 2019-12-19 2021-06-24 曙ブレーキ工業株式会社 Matériau de friction

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