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Porous copper powder modified friction material

  • US 5,339,931 A
  • Filed: 05/07/1993
  • Issued: 08/23/1994
  • Est. Priority Date: 05/07/1993
  • Status: Expired due to Term
First Claim
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1. In a brake system including an aluminum-metal matrix composite rotor, an actuation member, and friction pads wherein the actuation member in response to an operational input moves the friction pads into engagement with the aluminum-metal matrix composite rotor to effect a brake application, the improvement in the formulation of said friction pads to prevent degradation of the aluminum-metal matrix composite rotor while providing an average coefficient of friction of from 0.38-0.42 when an operational temperature of -40°

  • to 450°

    C. is generated during a brake application, said composition comprising;

    8-15 percent by weight of phenolic resin for said friction pads;

    5-12 percent by weight of an organic friction modifier selected from a group consisting of rubber scrap, cellulose, latex, cork, and cashew particles to provide friction stability in the friction pads through the development of a glaze on the surface of the aluminum-metal matrix composite rotor during a brake application;

    1-5 percent by weight of aramid fiber to aid in the initial processing the composition and to provide resistance to wear for the friction pads;

    4-14 percent by weight of a carbonaceous material selected from a group consisting of natural graphite, synthetic graphite, carbon and coke;

    4-20 percent by weight of glass fiber to provide strength for the friction pads;

    36-60 percent by weight of inorganic friction modifiers selected from a group consisting of barytes, whiting, talc, rottenstone, verrniculite and suzorite mica to provide strength and friction stability for the friction pads;

    2-12 percent by weight of an abrasive particle selected from a group consisting of silica, magnesia, zircon, zirconia, mullite, alumina, and iron oxides for developing a desired level for the coefficient of friction and a degree of friction stability necessary for the friction pads;

    - 8percent by weight of a lubricant material selected from a group consisting of molybdenum sulfide, calcium fluoride, antimony trisulfide, and cryolite; and

    2-18 percent by weight of porous copper powder, said porous copper powder assisting in the formation of the glaze to reduce wear between the aluminum rotor and friction pads during a brake application.

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