Multiple extrusion of polycrystalline extrudates

Details Multiple extrusion of polycrystalline extrudates Multiple extrusion of polycrystalline extrudates

1973-12-17

1977-08-23

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264176R, 264332, B29D 1100

Patent

active

040440826

ABSTRACT:
Scintillation phosphors, infrared and ultraviolet transmitting shaped articles of unrestricted length and arbitrary cross section are formed by multiple extrusion of a relatively small single crystal, melt-grown macrocrystal ingot, or, re-extrusion of a relatively small, fully dense polycrystalline parent mass at a temperature below its melting point and under sufficient pressure to form a fully dense, homogeneous polycrystalline mass. A re-extrudate of a first extrudate is wider in cross section than the parent single crystal, or the first extrudate, yet the scintillation, infrared and ultraviolet transmission properties of the polycrystalline re-extrudate are essentially the same or better than those of the parent single crystal or polycrystalline first extrudate.
A polycrystalline re-extrudate is disclosed which is optically the same as, but structurally different from a single crystal or first extrudate. It is both optically and structurally different from a hot-pressed or extruded powder. The unique crystalline structure of the re-extrudate is distinguishable from either a first extrudate of a single crystal, or a hot-pressed or extruded powder by its characteristic scatter of a 6328A Laser beam.

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