FORMATION AND PROPERTIES OF SOLID SOLUTIONS OF ZrO$sub 2$ WITH OXIDES OF RARE-EARTH ELEMENTS

Journal Article · Tue Jan 01 04:00:00 EST 1963 · Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.)

OSTI ID:4648795

Leler, E L; Andreeva, A B

The formation and properties of solid solutions in the systems ZrO/sub 2/ - CeO/sub 2/, ZrO/sub 2/- Y/sub 2/O/sub 3/, and ZrO/sub 2/ - L a/sub 2/O/sub 3/ were studied. Specimens were compacted from mixtures of chemically pure oxides (70 to 95 or 20 mol% ZrO/sub 2/ and 30to 5 or 80 mol% of the second oxide) under a pressure of 500 kg/cm/sup 2/, and fired at 1400-1700 deg C. The specimens were subjected to chemical, x-ray and dilatometric analyses, and their ceramic, elastic, electrical, and physical properties were studied. At 1400 deg C the systems form solid solutions with a cubic structure. The porosity of specimens heated at 1400 deg C for 6 hrs is 30 to 40%; sintering occurs on heating to 1700- 1750 deg C for 3 hrs. In specimens containing 20 mol% CeO/sub 2/, 15 mol% Y/sub 2/O/sub 3/, or 25 mol% La/sub 2/2O/sub 3/, ZrO /sub 2/ is fully stabilized by heating to 1700-1750 deg C. Addition of CeO/sub 2/ or Y/sub 2/O/sub 3/ lowers the temperature of the polymorphic transformation of ZrO/sub 2/. New highly refractive materials can be obtained by firing to 1750 deg C the solid solutions ZrO/sub 2/-20% CeO/sub 2/, ZrO/sub 2/-80% CeO/sub 2/, ZrO/sub 2/- 15% Y/sub 2/O/ sub 3/, ZrO/sub 2/-80% Y/sub 2/O/sub 3/ and ZrO/sub 2/- La/sub 2/O/sub 3/. Some of the materials have a lower thermal expansion coefficient and higher thermal stability (at 1200 deg C) than ZrO/sub 2/ stabilized with CaO or Mg). The highest thermal and chemical stability is exhibited by ZrO/sub 2/-Y/sub 2/O/sub 3/ solid solutions. (OTS)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-034453
• OSTI ID: 4648795
• Journal Information: Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.), Journal Name: Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.) Vol. Vol: No. 5; ISSN OGNPA
• Country of Publication: Country unknown/Code not available
• Language: English

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