Method of manufacturing transparent high density ceramic materia

Details Method of manufacturing transparent high density ceramic materia Method of manufacturing transparent high density ceramic materia

1990-02-02

1991-07-16

Group, Karl

Compositions

Piezoelectric

501134, C04B 3548

Patent

active

050323040

ABSTRACT:
A method of manufacturing a transparent, high density green material which comprises: sintering a PLZT ceramic compact in a vacuum of 1.times.10.sup.-2 to 1.times.10.sup.-5 Torr at 1150.degree. C. to 1250.degree. C. for 0.5 to 2 hours, fabricating the sintering product into a sheet of less than 1.5 mm thickness, embedding the sheet into a heat resistant vessel tightly packed with a powder of 50 .mu.m to 3000 .mu.m grain size comprising at least one of fused alumina, zirconia and magnesia and then applying HIP under 500 to 700 kg/cm.sup.2, at 1050.degree. C. to 1200.degree. C., for 0.5 to 2 hours by using an inert gas as a pressure medium. Ceramics for optical devices having high transparency and density can be mass produced economically in a short time.

REFERENCES:
patent: 3666666 (1972-05-01), Haertling
patent: 3917780 (1975-11-01), Mazdiyasni et al.

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