Method of manufacturing transparent high density ceramic material
AssigneeSumitomo Special Metal Co., Ltd.
InventorSachio Toyota
Life of this patent
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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.
Claims9
A method of manufacturing a transparent, high density ceramic material which comprises:
- sintering a green compact mainly comprising an oxide of each of lead, lanthanum, zirconium and titanium in a vacuum from 1.times.10.sup.-2 to 1.times.10.sup.-5 Torr within a temperature range of 1150.degree. C. to 1250.degree. C. and for a time from 0.5 to 2 hours to form a sintering product,
- fabricating said sintering product into a thin sheet having a thickness of less than 1.5 mm,
- positioning said thin sheet in a heat resistant vessel so that it is surrounded by a tightly packed powder comprised of at least one oxide selected from the group consisting of fused alumina, fused zirconia and fused magnesia, said powder having a grain size of 50 .mu.m to 3000 .mu.m, and then
- hot isostatically pressing said thin sheet at a pressure of 500 to 700 kg/cm.sup.2, a temperature of 1050.degree. C. to 1200.degree. C. and for a time for 0.5 to 2 hours using an inert gas as a pressure medium.
Dependencies are inferred from the claim text.