PTFE/polyphenylene sulphide bearing material and method of manufacture
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United States of America Patent
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Issued Date -
Jul 22, 2004
app pub date -
Jan 16, 2003
filing date -
Jan 16, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A bearing material and a method for the production thereof are described. The bearing material comprising a matrix of polytetrafluoroethylene (PTFE) having dispersed therein in 10 to 30 volume % polyphenylene sulphide. The method of making a PTFE/PPS bearing material comprises the steps of mixing an aqueous dispersion of polytetrafluoroethylene with 10 to 30 volume % of an aqueous dispersion of polyphenylene sulphide, co-coagulating the PTFE and PPS; removing excess water; at least partially drying the wet co-coagulated material to provide an at least partially dried powder material; spreading said at least partially dried powder material particles onto a substrate to form a bearing material layer; compacting said layer; drying said compacted layer to drive off residual liquid; and, sintering said dried, compacted layer at a temperature above the melting point of said PTFE constituent.
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