Tribological materials and structures and methods for making the same
First Claim
Patent Images
1. A plastic article having a bearing surface, comprising:
- a polymeric matrix material; and
a first additive that is a lubricious reinforcing graphitized pitch-based carbon fiber having a thermal conductivity of at least about 50 W/m°
K.
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Accused Products
Abstract
An article having a bearing surface with improved wear characteristics is provided. The article may be formed from a composition that includes a polymeric material, a lubricious and reinforcing additive, and a solid lubricant. Methods for forming the compositions and structures are also provided.
66 Citations
85 Claims
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1. A plastic article having a bearing surface, comprising:
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a polymeric matrix material; and
a first additive that is a lubricious reinforcing graphitized pitch-based carbon fiber having a thermal conductivity of at least about 50 W/m°
K. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A plastic article having a bearing surface, comprising:
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a polymeric matrix material; and
about 5 percent to about 75 percent by weight of a first additive comprising graphitized pitch-based carbon fibers having a density of at least about 2.0 gm/cm3;
wherein the plastic article has a wear factor of less than about 200 under a load of about 200 psi and a velocity of about 50 feet per minute. - View Dependent Claims (38, 39)
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40. A plastic article having a bearing surface, comprising:
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a polymeric matrix material selected from the group consisting of polyamideimide, polyetherimide, polyimide, polyetheretherketone, polyphenylene sulfide, liquid crystal polymer, and combinations thereof; and
about 5 percent to about 75 percent by weight of a first additive selected from the group consisting of graphitized pitch-based carbon fibers having a tensile strength of greater than about 200 KSI, a tensile modulus greater than about 100 MSI, a density ranging from about 2.15 to about 2.25 gm/cm3, a Tc ranging from about 400 to about 1100 W/m°
K, and a diameter ranging from about 7 microns to about 10 microns and combinations thereof;
wherein the plastic article has a wear factor of less than about 200 under a load of about 200 psi and a velocity of about 50 feet per minute.
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41. A plastic article having a bearing surface, comprising:
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a polymeric matrix material;
about 2 percent to about 75 percent by weight of a first additive comprising graphitized pitch-based carbon fibers having a density of at least about 2.0 gm/cm3; and
about 2 percent to about 75 percent by weight of a second additive, wherein the plastic article has a wear factor of less than about 200 under a load of about 200 psi and a velocity of about 50 feet per minute. - View Dependent Claims (42, 43, 44)
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45. A plastic article having a bearing surface, comprising:
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a polymeric matrix material selected from the group consisting of polyamideimide, polyetherimide, polyimide, polyetheretherketone, polyphenylene sulfide, liquid crystal polymer, and combinations thereof;
about 2 percent to about 75 percent by weight of a first additive selected from the group consisting of graphitized pitch-based carbon fibers having a tensile strength of greater than about 200 KSI, a tensile modulus greater than about 100 MSI, a density ranging from about 2.15 to about 2.25 gm/cm3, a Tc ranging from about 400 to about 1100 W/mEK, and a diameter ranging from about 7 microns to about 10 microns, and combinations thereof; and
about 2 percent to about 75 percent by weight of a second additive selected from the group consisting of boron nitride, carbon, graphite, molybdenum disulfide, talc, tetrafluoroethylene, and combinations thereof;
wherein the plastic article has a wear factor of less than about 200 under a load of about 200 psi and a velocity of about 50 feet per minute.
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46. A plastic article having a bearing surface, comprising:
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a polymeric matrix material;
a lubricious reinforcing first additive comprising graphitized pitch-based carbon fibers; and
a lubricious second additive;
wherein the article has a wear factor of less than about 25 under a load of about 200 psi and a velocity of about 50 feet per minute. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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70. A method of forming a bearing composition, comprising the steps of:
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forming a solution of a polymeric matrix material and a first additive; and
evaporating the solvent. - View Dependent Claims (71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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82. An additive for a polymeric matrix material, comprising:
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a lubricious reinforcing first additive comprising graphitized pitch-based carbon fibers; and
a lubricious second additive.
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83. A plastic article having a bearing surface, comprising:
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a polymeric matrix material; and
a first additive that is a lubricious graphitized pitch-based carbon fiber having a thermal conductivity of at least about 50 W/m°
K.
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84. A plastic article having a bearing surface, comprising:
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a polymeric matrix material;
a first additive that is a lubricious a first additive that is a lubricious graphitized pitch-based carbon fiber having a thermal conductivity of at least about 50 W/m°
K; and
a lubricious second additive.
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85. A plastic article having a bearing surface, comprising:
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a polymeric matrix material;
a first additive that is a lubricious graphitized pitch-based carbon fiber having a thermal conductivity of at least about 50 W/m°
K; and
a lubricious second additive selected from the group consisting of boron nitride, carbon, graphite, molybdenum disulfide, talc, tetrafluoroethylene, and combinations thereof.
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Specification