Method of forging spinel domes

Details Method of forging spinel domes Method of forging spinel domes

1980-05-09

1982-08-31

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264 12, 264 27, 264320, 264325, B29D 1100

Patent

active

043472109

ABSTRACT:
A method of forging spinel into complex shapes in which a spinel plate is placed in a mold while the spinel plate is heated, in an atmosphere of helium, to a temperature below its melting point and above its solid two phases transition point that allows plastic deformation to take place. Forging stresses well above the yield point of the spinel are applied to the plate by the mold to reduce the forging time.

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patent: 3431326 (1969-03-01), Letter
patent: 3864808 (1975-02-01), Doser
patent: 3875277 (1975-04-01), Bratton et al.
patent: 3933970 (1976-01-01), Rosette et al.
patent: 4171400 (1979-10-01), Rosette et al.
Rhodes et al., "Hot-Working of Aluminum Oxide: II, Optical Properties", Journal of the Am. Ceramic Soc., vol. 58, No. 1-2, Feb. 75, pp. 31-34.
Becher, "Press-Forged Al.sub.2 O.sub.3 -Rich Spinel Crystals for IR Applications", Am. Ceramic Soc. Bull., vol. 56, No. 11, (1977) pp. 1015-1017.

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