| 摘要 |
<p>A composite material comprising an ultra-high molecular weight polymer and fibers having lengths of about 0.05 inch (1270 micrometers). This composite is formed by first dispersing the fibers with particles of the polymer in an inert liquid carrier. The dispersion is drawn through a filter which collects the particles and fibers as an intermediate structure in which the fibers are oriented in a quasi-isotropic array and the particles are dispersed throughout this fiber network. The intermediate structure is removed from the filter, dried, compacted, and then compressed at an elevated temperature such that the polymer melts, while the fibers remain unmelted. Upon cooling, there is formed a composite comprising a continuous polymer matrix reinforced with the randomly oriented and intertwined fibers of relatively long length. This material can be formed into articles, such as piston rings or seals, to provide a self-lubricating structure having good wear resistance and creep resistance.</p> |
