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2 065 414

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IPC

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Application

5029249/26, 1991-12-02

(22)

Actual filing date

1991-12-02

(45)

Published

1996-08-20

(72)

Inventor

Andreev M.E.Vanyshev V.A.Golenko V.P.Poljanskij E.V.Jarotskaja E.G.Jarotskij V.G.

(73)

Holder

Vserossijskij Nauchno-Issledovatel'Skij Institut Sinteza Mineral'Nogo Syr'Ja

METHOD FOR PRODUCTION OF DYED CRYSTALS OF HIGH-MELTING OXIDES Russian patent published in 1996 - IPC

Abstract RU 2065414 C1

FIELD: production of dyed crystals of high-melting oxides based on zirconium dioxide for obtaining jewelry stones. SUBSTANCE: method for production of dyed crystals of high-melting oxides provides for use of mixture with the following qualitative and quantitative composition, mass.%: yttrium oxide, 20-29; gadolinium oxide 0.5-3.0; cobalt oxide 1.5-3.5; praseodymium oxide 10-15; the balance, zirconium dioxide. Melt is held for 5-20 min. Oriented crystallization is carried out in cold container at the rate of 2-6 mm/h. Crystals are cooled from the crystallization temperature at the rate of 12-20 C/min down to 1450-1550 C and held at this temperature for 0.5-2 h. EFFECT: higher efficiency. 1 cl, 1 tbl

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RU 2 065 414 C1

Authors

Andreev M.E.

Vanyshev V.A.

Golenko V.P.

Poljanskij E.V.

Jarotskaja E.G.

Jarotskij V.G.

Dates

1996-08-20—Published

1991-12-02—Filed

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