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US 5,508,109 AGranted
Fiber blend for low cost, asbestos free friction material
AssigneesAvco Corporation, Monsanto Company
InventorsArvind S. Patil, George P. Boyd, Jr.
Life of this patent
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Abstract
A fiber blend for use in friction materials. The fiber contains a blend of a highly fibrillated fiber, such as a fibrillated polyacrylonitrile fiber and a fiber with a high carbon content, such as an oxidized carbon fiber precursor.
Claims12
A method of manufacturing a blended fiber comprising the steps of:
- a) chopping a polyacrylonitrile fiber which can be fibrillated and an oxidized polyacrylonitrile fiber containing carbon simultaneously;
- b) refining the chopped fiber to fibrillate at least the fiber which can be fibrillated.
A fiber blend for use in friction materials comprising:
- a) a high surface area component, consisting essentially of fibrillated polyacrylonitrile fiber, having a surface area in excess of 10 m.sup.2 /gm;
- and
- b) a strength component, consisting essentially of oxidized carbon fiber, having a surface area between 1 and 2 m.sup.2 /gm, a tensile strength in excess of 150 Ksi and a tensile modulus in excess of 10.times.10.sup.6 psi,
- wherein the high surface area component and high strength component are uniformly mixed.
1 more element
Dependencies are inferred from the claim text.