Abstract: A method for the forming of semi-solid nucleated metallic alloys that have been sprayed in molten form into a container for intermediate casting. According to the present invention, a molten stream of metallic alloy is disrupted into a plurality of molten metallic alloy droplets, and the droplets are partially solidified as a plurality of degenerative dendritic globules so that approximately 5% to 60% by volume of each average degenerative dendritic globule is solid and the remainder is molten. The partially solidified globules are collected to form a semi-solid mass, and a portion of the semi-solid mass is forced into a die cavity prior to solidification to form a shaped metallic alloy.

Abstract: A method for manufacturing bidirectional hydrodynamic polytetrafluoroethylene shaft seals. A flat annular wafer of polytetrafluoroethylene of constant thickness is coined at an annular inner portion adjacent the inner periphery to provide first and second circular ribs and a series of straight segmental ribs, each of which extends tangential to the inner side of the inner rib, thereby intersecting the inner rib, the crest of the straight ribs projecting out further than the crest of the inner rib. Then the annular inner portion is formed into a generally frustoconical shape, whereby the straight ribs appear as curved ribs. The frustoconical portion is flexed on installation on a shaft to be generally cylindrical from at least the outer rib to the inner periphery.