WO2009104073A1 - Matériau de friction et procédé de production correspondant - Google Patents

Matériau de friction et procédé de production correspondant Download PDF

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Publication number
WO2009104073A1
WO2009104073A1 PCT/IB2009/000286 IB2009000286W WO2009104073A1 WO 2009104073 A1 WO2009104073 A1 WO 2009104073A1 IB 2009000286 W IB2009000286 W IB 2009000286W WO 2009104073 A1 WO2009104073 A1 WO 2009104073A1
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WO
WIPO (PCT)
Prior art keywords
frictional
resin binder
carbonized
granulated
mass
Prior art date
Application number
PCT/IB2009/000286
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English (en)
Inventor
Shigeru Ichikawa
Original Assignee
Toyota Jidosha Kabushiki Kaisha
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Publication date
Application filed by Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Publication of WO2009104073A1 publication Critical patent/WO2009104073A1/fr

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Classifications

    • 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—Compositions of linings; Methods of manufacturing
    • F16D69/025—Compositions based on an organic binder
    • F16D69/026—Compositions based on an organic binder containing fibres
    • 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
    • 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
    • C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
    • C04B35/62209—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse using woody material, remaining in the ceramic products
    • 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
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/74—Ceramic products containing macroscopic reinforcing agents containing shaped metallic materials
    • C04B35/76—Fibres, filaments, whiskers, platelets, or the like
    • 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
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
    • C04B35/83—Carbon fibres in a carbon matrix
    • 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
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
    • 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
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3215—Barium oxides or oxide-forming salts thereof
    • 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
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/425—Graphite
    • 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
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
    • C04B2235/446—Sulfides, tellurides or selenides

Definitions

  • the invention relates to frictional materials and methods for producing frictional materials. More particularly, the invention relates to frictional materials having a granulated material containing resin binder and fiber base material and to methods for producing such frictional materials. For example, frictional materials according to the invention and frictional materials obtained in production methods according to the invention can be effectively applied to brake pads for vehicles, brake linings for vehicles, and clutch facings for vehicles.
  • frictional material for vehicle brake pads, and the like contains resin binder (e.g., phenol resin), fiber based material selected from non-organic fiber, organic fiber, and metal fiber, and filler (e.g., friction adjuster).
  • resin binder e.g., phenol resin
  • fiber based material selected from non-organic fiber, organic fiber, and metal fiber
  • filler e.g., friction adjuster
  • Such friction material is produced by mixing fiber base material, and resin binder, filler, and the like which are powders, in a dried condition and then heating and pressure-forming the mixture.
  • JP-A-4- 139290 describes a frictional material that is obtained by mixing a granulated material that is composed of fillers and resin binder (phenol resin), reinforced fiber, resin binder (phenol resin), and then heating and pressure-forming the obtained mixture.
  • the granulated material is, for example, obtained by mixing metal dust, solid lubricant (graphite), metal oxide, fillers (e.g., cashew dust, non-organic filler), and phenol resin while heating them to 80 0 C, and then cooling them.
  • the friction coefficient of the frictional material decreases in a severe condition, such as when the temperature and pressure at the frictional surface of the frictional material are high, and therefore it is difficult to obtain a high heat resistance (e.g., anti-fade performance).
  • a high heat resistance e.g., anti-fade performance
  • the temperature at the frictional surface of a vehicle brake pad increases up to approx. 800 0 C at maximum. If the temperature at the frictional surface of the frictional material increases up to such a high temperature, the resin binders contained in the frictional material are carbonized, whereby gaps are created in the frictional material.
  • hard particles that are preferred to be present at the frictional surface of the frictional material are buried in the frictional material.
  • the load on the hard particles decreases, and therefore the cutting effects of the hard particles deteriorate, resulting in a decrease in the frictional coefficient of the frictional material.
  • JP-A-2006-306970 describes a frictional material that is obtained by carbonizing, through calcination, a mixture of organic material (pitch, phenol resin), non-organic filler (e.g., alumina, magnesium oxide), solid lubricant (e.g., synthetic graphite), metal dusts (e.g., copper dusts, aluminum dusts).
  • organic material is heated, under certain load, at 550 to 1300 0 C in an inactive gas atmosphere, whereby the organic material is carbonized through calcination and thus binder is obtained.
  • the invention provides frictional materials that provide both improved heat resistance (e.g., anti-fade performance) and improved anti-noise performance.
  • the first aspect of the invention relates to a frictional material.
  • This frictional material has a resin binder and a carbonized granulated material dispersedly provided in the resin binder.
  • the carbonized granulated material is obtained by carbonizing a granulated material containing a fiber base material, a resin binder, and at least one kind of filler.
  • the carbonized granulated material contains no or almost no organics (e.g., resin binder). Therefore, the amount of organics (e.g., resin binder) contained in the friction material is very small as compared to a frictional material containing non-carbonized granulated materials, and this significantly improves the heat resistance, such as the anti-fade performance.
  • organics e.g., resin binder
  • the frictional material of the first aspect of the invention because the resin binder is provided between the carbonized granulated materials, the spring constant of the frictional material is smaller than that of a frictional material using carbonized organic material as binder, and therefore the anti-noise performance is high.
  • the frictional material of the first aspect of the invention provide both improved heat resistance (e.g., anti-fade performance) and improved anti-noise performance.
  • the ratio of the resin binder contained in the frictional material is preferably 5 to 25 pts. mass, more preferably 5 to 20 pts. mass, more preferably 10 to 15 pts. mass, and more preferably 12 pts. mass.
  • the second aspect of the invention relates to a method for producing a frictional material.
  • This method includes: a granulated material preparation process that prepares a granulated material containing a fiber base material, a resin binder, and at least one kind of filler; a carbonization process that obtains a carbonized granulated material by carbonizing the granulated material; and a forming process that forms a frictional material by heating and pressure-forming a first mixture containing a resin binder and the carbonized granulated material.
  • the method of the second aspect of the invention it is possible to obtain a frictional material in which the carbonized granulated material that is obtained by carbonizing granulated material containing fiber base material, resin binder, and at least one kind of filler is dispersedly provided in the resin binder.
  • the method of the second aspect of the invention it is possible to improve both the heat resistance, such as the anti-fade performance that deteriorates if the amount of resin binder contained in the frictional material is too large, and the anti-noise performance that deteriorates if the amount of resin binder contained in the frictional material is too small.
  • the method of the second aspect of the invention may be such that, in the granulated material preparation process, a second mixture is obtained by mixing the fiber base material, the resin binder, and the filler, and then the second mixture is heated and then cooled, whereby a granulated material is prepared.
  • the second mixture may be heated at 70 to 90 0 C.
  • the method of the second aspect of the invention may be such that, in the carbonization process, the granulated material is carbonized by being heated in an inactive gas atmosphere. In this case, the granulated material may be heated at 550 to 1300 0 C in the inactive gas atmosphere.
  • the method of the second aspect of the invention may be such that, in the forming process, the first mixture is pressure-formed while being heated, and the first mixture is then hardened by being heated, whereby a frictional material is prepared.
  • the first mixture may be heated at 150 to 180 °C.
  • the first mixture may be pressure-formed at 10 to 30 MPa.
  • the first mixture may be heated at 200 to 250 0 C for hardening.
  • the frictional materials according to the first and second aspects of the invention can be effectively used especially as dry-type frictional materials (e.g., disk brakes, drum brake linings, clutch facings) the surfaces of which tend to become high in temperature, whereby the heat resistance (e.g., anti-fade performance) and the anti-noise performance can be both achieved.
  • dry-type frictional materials e.g., disk brakes, drum brake linings, clutch facings
  • FIG. 1 is a cross-sectional view schematically showing the structure of a frictional material according to an example embodiment of the invention
  • FIG. 2 is a graph illustrating the result of examination on the anti-fade performances of a brake pad of the example embodiment of the invention and a brake pad according to a first comparative example;
  • FIG 3 is a graph illustrating the result of examination on the friction coefficients of a brake pad of the example embodiment of the invention and a brake pad according to the first comparative example;
  • FIG 4 is a graph illustrating the result of examination on the anti-noise performances of a brake pad of the example embodiment of the invention and a brake pad according to a second comparative example;
  • FIG 5 is a graph showing the friction coefficients of the brake pads of the example embodiment each containing a specific amount of resin binder.
  • Frictional material 10 according to an example embodiment of the invention is shown in FIG 1.
  • the friction material 10 has resin binder 1 and carbonized granulated material 2 that is dispersedly provided in the resin binder 1.
  • the kind of the resin binder 1 is not limited to any specific kind.
  • typical resin binder may be used as the resin binder 1.
  • phenol resin polyimid resin, polyamide-imide resin, polyamide resin, aromatic polyester resin, polyphenylsulfone resin, polyetheretherketone resin, polyfluoroethylene resin, and their modified resins may be used.
  • the carbonized granulated material 2 is a carbonized material that is obtained by carbonizing granulated material containing fiber base material, resin binder, and at least one type of filler.
  • the kind of the fiber base material is not limited to any specific kind. That is, appropriate fiber base material may be selected according to the characteristics required of the friction material 10.
  • the friction material 10 may be metal fiber, such as copper fiber and aluminum fiber, or may be organic fiber or non-organic fiber.
  • the kind of the resin binding material that is used to obtain a granulated material for the carbonization of the carbonized granulated material 2 is not limited to any specific kind.
  • the resin binder 1 for example, generally used phenol resin, polyimid resin, polyamide-imide resin, polyamide resin, aromatic polyester resin, polyphenylsulfone resin, polyetheretherketone resin, polyfluoroethylene resin, and their modified resins may be used.
  • the kind of the at least one filler contained in the carbonized granulated material 2 is not limited to any specific kind.
  • it may be at least one selected from various friction adjusters and fillers including graphite, sulfide (e.g., molybdenum disulfide, zinc sulfide), cashew dust, non-organic oxide (e.g., calcium hydroxide, alumina, silica, zirconium silicate, zirconia), barium sulfate, ferric oxide, calcium carbonate, mica, kaolin, talc, and so on.
  • the size and shape of the carbonized granulated material 2 are not specifically limited, and its production method is not specifically limited either.
  • the grain size of the carbonized granulated material 2 may be approx. 1 to 10 mm.
  • the carbonized granulated material 2 preferably, at least 90 wt% of the organics (e.g., the resin binder) contained in the granulated material before the above-described carbonization are carbonized, and more preferably said organics are entirely carbonized.
  • the organics e.g., the resin binder
  • the ratio of the resin binder 1 is preferably 5-25 pts. mass, more preferably 5-20 pts. mass, and far more preferably 10-15 pts. mass, far more preferably, 12 pts. mass. If the ratio of the resin binder 1 contained in the friction material 10 is too low, the friction material 10 is difficult to be formed properly. On the other hand, if the ratio of the resin binder 1 contained in the friction material 10 is too high, the heat resistance (e.g., anti-fade performance ) of the frictional material 10 deteriorates significantly.
  • the friction material 10 of this example embodiment can be effectively used as, for example, dry-type friction materials for vehicles, such as brake pads (disk brake pads), brake linings, clutch facings, and so on.
  • the friction material 10 can be produced in the following production method. Note that this production method is only exemplary.
  • Fiber base material, powdery resin binder, and at least one kind of filler are uniformly mixed in a dried condition by using a mixer, or the like, and then the obtained mixture is heated then cooled. Then, it is cut into pieces in predetermined sizes, whereby granulated material is obtained.
  • the heating conditions are: heating temperature: approx. 70 to 90 0 C, and heating time: approx. 5 to 120 min.
  • the granulated material obtained in the foregoing preparation process is then carbonized, whereby the carbonized granulated material 2 is obtained.
  • the carbonization condition are: atmosphere: inactive gas atmosphere (e.g., argon gas), heating temperature: 550 to 1300 0 C, and heating time: 1 to 4 hours.
  • the carbonized granulated material 2 obtained in the foregoing carbonization process and the powdery resin binder 1 are then mixed. Then, the obtained mixture is heated and pressure-formed into a given shape using a metal mold.
  • the molding conditions are: heating temperature: approx. 150 to 180 0 C, pressure: approx. 10 to 30 MPa, time of pressure-forming with heating: approx. 5 to 20 min.
  • the obtained product is then heated for hardening, whereby the friction material 10 is obtained.
  • the friction material 10 is obtained by mixing the carbonized granulated material 2 and the resin binder 1 and then pressure-forming the obtained mixture while heating it.
  • the heating hardening conditions are: heating temperature: approx. 200 to 250 0 C, and heating time: approx. 1 to 6 hours.
  • the friction material 10 is obtained which dispersedly contains the carbonized granulated material 2 that is obtained by carbonizing the granulated material containing fiber base material, resin binder, and at least one kind of filler.
  • the carbonized granulated material 2 containing no or almost no organics (e.g., resin binder) is dispersedly provided in the resin binder 1. Therefore, the amount of organics (e.g., resin binder) contained in the friction material 10 is very small, and this significantly improves the heat resistance, such as the anti-fade performance.
  • the resin binder 1 is provided between the carbonized granulated materials 2, the spring constant of the friction material 10 is small, and thus the anti-noise performance is high.
  • the friction material 10 of the example embodiment has both improved heat resistance (e.g., anti-fade performance) and improved anti-noise performance.
  • a disk brake pad for vehicle is produced using a frictional material according to an example embodiment of the invention.
  • Table 1 shown below indicates the prepared materials and their amounts.
  • Fiber base material such as non-organic fiber (potassium titanate fiber), brass fiber, aramid fiber, resin binder such as phenol resin powder, and various powders such as graphite, sulfide (molybdenum disulfide), cashew dust, calcium hydroxide, and barium sulfate which function as fillers were mixed in a dried condition. The mixing was uniformly performed for 5 minutes using EIRICH mixer.
  • the obtained mixture was cooled at 80 0 C for 60 minutes, and then it was cut into pieces in predetermine sizes, whereby granulated material was obtained.
  • the granulated material was then heated in argon gas at 1000 0 C for 4 hours for carbonization, whereby carbonized granulated material 2 having a diameter of approx. 3 to 5 mm was obtained.
  • the ratio of the phenol resin contained in the disk brake pad produced in the manner described above was 12 pts. mass.
  • a disk brake pad was produced in a procedure identical to that of the foregoing example embodiment except that the carbonization process was not performed.
  • the ratio of the phenol resin contained in the disk brake pad of the first comparative example was 26 pts. mass.
  • the respective materials shown in Table 1 were mixed in a dried condition.
  • the amount of each material was as shown in Table 1.
  • the obtained mixture was put in the metal mold that had been heated up to 160 °C and then heated therein at a pressure of 19.6 MPa for 10 minutes for pressure forming, and then it was heated in the metal mold at 230 0 C for three hours for hardening.
  • the obtained product was carbonized by being heated in an argon gas atmosphere at 1000 0 C for four hours, whereby a carbonized disk brake pad in which the organics (e.g., phenol resin) had been carbonized was obtained.
  • the organics e.g., phenol resin
  • the ratio of the phenol resin contained in the disk brake pad was 0 pts. mass.
  • FIG. 2 shows the examination result based on "First Fading Test”
  • FIG 3 shows the examination result based on "Second Effect Test”.
  • the anti-fade performance of the disk brake pad of the example embodiment of the invention that contains the carbonized granulated material was much higher than that of the disk brake pad of the first comparative example that contains granulated material including phenol resin.
  • the rate of decrease in the frictional coefficient of the brake pad of the first comparative example is higher than the rate of decrease in the frictional coefficient of the brake pad of the example embodiment of the invention.
  • a brake pad containing carbonized granulated material provides a higher anti-fade performance and provides a high frictional coefficient even under a severe condition where the pressure at the friction surface of the brake pad is high at a high temperature, thus exhibiting a high heat resistance.
  • FIG. 4 shows the result of the test. Note that "NOISE RATE (%)" in FIG 4 represents the ratio of the number of times brake noises were created to the number of times braking was performed.
  • the anti-noise performance of the brake pad of the example embodiment of the invention that contains the carbonized granulated material was significantly higher than that of the carbonized brake pad of the second comparative example.
  • a brake pad containing carbonized granulated material provides a higher anti-noise performance.
  • various brake pads each containing resin binder at the composition ratio indicated in Table 2 below were produced by, for example, replacing part of phenol resin with barium sulfate or by replacing part of barium sulfate with phenol resin.
  • the anti-fade performance value Min ⁇ is lower than the target value that is at least 0.15.
  • Min ⁇ became 0.2 or more, exhibiting an improved anti-fade performance. Further, when the amount of the resin binder contained in the brake pad was within 10 to 15 pts. mass, Min ⁇ became 0.25 or more, exhibiting a further improved anti-fade performance. Furthermore, when the amount of the resin binder contained in the brake pad was 12 pts. mass, Min ⁇ became 0.28, exhibiting a furthermore improved anti-fade performance.
  • the ratio of resin binder contained in the brake pad is preferably 5 to 25 pts. mass, more preferably 5 to 20 pts. mass, more preferably 10 to 15 pts. mass, and far more preferably 12 pts. mass.

Abstract

La présente invention concerne un matériau de friction (10) comprenant un liant résinique (1) et un matériau granulaire carbonisé (2) dispersé dans le liant résinique (1). Le matériau granulaire carbonisé (2) résulte de la carbonisation d'un matériau granulaire contenant un matériau de base en fibres, un liant résinique, et au moins une sorte de matière de remplissage. L'absence d'agent organique tel qu'un liant résinique dans le matériau granulaire carbonisé (2) fait que la quantité d'agents organiques tels que les liants résiniques contenus dans le matériau de friction (10) est très est minime si on la compare à la quantité d'agents organiques contenus dans un matériau de friction conventionnel dans lequel sont dispersés des matériaux granulaires contenant des liants résiniques. Il en résulte que ce matériau de friction offre une résistance à la chaleur notablement élevée (par exemple, efficacité anti-évanouissement). En outre, étant donné que le liant résinique (1) se trouve dans le matériau granulaire carbonisé, la constante d'élasticité du matériau de friction (10) est inférieure à celle d'un matériau de friction conventionnel utilisant comme liant un matériau organique carbonisé, d'où une efficacité antibruit élevée du matériau de friction (10).
PCT/IB2009/000286 2008-02-19 2009-02-18 Matériau de friction et procédé de production correspondant WO2009104073A1 (fr)

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JP2008-037423 2008-02-19
JP2008037423A JP2009197054A (ja) 2008-02-19 2008-02-19 摩擦材及びその製造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2412692A3 (fr) * 2010-07-28 2012-07-25 Brembo SGL Carbon Ceramic Brakes GmbH Procédé de fabrication d'une composition de matériau contenant des fibres, cette composition de matériau et pièce usinée

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019112270A (ja) * 2017-12-25 2019-07-11 住友ベークライト株式会社 機能性フィラー、造粒フィラー、炭化フィラー、樹脂組成物、成形物及び機能性フィラーの製造方法

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