Sintered polytetrafluoroethylene composite material and seal assembly
AssigneeHughes Aircraft Company
InventorPaul R. Doose
Life of this patent
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Abstract
A composition of matter adapted for use as a sealing material and in fabricating bushings, rider rings and structural support pads. The composition is sintered polytetrafluoroethylene (PTFE) having uniformly dispersed therein from 5 to 50 volume percent of filler particles selected from the group consisting of glass particles and mineral particles having a Rockwell C hardness of between 10 C to 50 C wherein the filler particles are present in the polytetrafluoroethylene when the sintering occurs. Lead glass, soda-lead glass and soda-lime glass are among the filler particles which are incorporated into the PTFE to form structurally strong compositions which generate low amounts of wear debris.
Claims20
A composition of matter comprising:
- sintered polytetrafluoroethylene having uniformly dispersed therein from 5 to 50 volume percent of filler particles selected from the group consisting of glass particles and mineral particles having a Rockwell C hardness of between about 10C to 50C wherein said filler particles are present in the polytetrafluoroethylene when the sintering occurs.
A composition of matter comprising:
- sintered polytetrafluoroethylene having uniformly dispersed therein from 5 to 50 volume percent of filler particles selected from the group consisting of glass particles having a Rockwell C hardness of between about 10C to 50C wherein said filler particles are present in the polytetrafluoroethylene when the sintering occurs and wherein the temperature of said sintering is above the annealing point of said glass.
In a seal assembly including a first member having a first sealable surface, said first surface having a first Rockwell hardness, a second member having a second sealable surface located in sealing relation to said first sealable surface, said second surface having a second Rockwell hardness, said seal assembly further including sealing material located between said first and second sealable surfaces to provide a seal therebetween, wherein the improvement comprises:
- sealing material comprising a sintered polytetrafluoroethylene having uniformly dispersed therein from 5 to 50 volume percent of glass filler particles having a Rockwell C hardness of between about 10C to 50C wherein said filler particles are present in the polytetrafluoroethylene when the sintering occurs and wherein the temperature of said sintering is above the annealing point of said glass filler particles.
Dependencies are inferred from the claim text.