Carbonaceous friction materials
AssigneeR.K. Carbon Fibers, Ltd.
InventorsW. Novis Smith, Philip Boyd
Life of this patent
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Abstract
The instant invention provides a non-asbestos friction material and method of making therefor having from about 2 to 20 wt % of carbonaceous fibers. The remainder of the friction material is an auxiliary material and a thermosetting resin. The carbonaceous fibers are derived from oxidized polyacrylonitrile based fibers. The wt % of bond carbon in the carbonaceous fibers is about 65 to 80.
Claims6
A compression molded brake pad material which comprises from about 2 to 20 wt % of carbonaceous fibers that have been prepared from oxidized polyacrylonitrile that have been heat treated without tension in an inert atmosphere;
- said carbonaceous fibers having a resistivity of from about 10.sup.6 ohm-cm to 10.sup.0 ohm-cm;
- the remainder of said brake pad material including powdered auxiliary material which includes metals and/or metal oxides and a powdered phenolic thermosetting resin;
- said carbonaceous fibers having a carbon content of from about 65 to 80% by weight and a median length of from about 0.5 to 50 mm.
An improved compression molded brake material having from about 80 to 25 wt % of a powdered phenolic thermosetting resin and powdered metal and/or metal oxides and from about 20 to 75 wt % of carbonaceous fibers that have been prepared from oxidized polyacrylonitrile that have been heat treated without tension in an inert atmosphere;
- said carbonaceous fibers having a resistivity of from about 10.sup.6 ohm-cm to 10.sup.0 ohm-cm;
- wherein the improvement comprises said carbonaceous fibers having a carbon content of from about 65 to 80% by weight and a median length of from about 0.5 to 50 mm.
Dependencies are inferred from the claim text.