Stable and metastable phase relationships in the system ZrO sub 2 -ErO sub 1. 5

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb04052.x· OSTI ID:5193459

Yashima, M; Ishizawa, N; Noma, T; Yoshimura, M ^[1]

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1. Research Lab. of Engineering Materials, Tokyo Inst. of Technology, Yokohama 227 (JP)

Stable and metastable phase relationships in the system ZrO{sub 2}-ErO{sub 1.5} were investigated using homogeneous samples prepared by rapid quenching of melts and by arc melting. The rapidly quenched samples were annealed in air for 48 h at 1680{degrees}C or for 8 months at 1315{degrees}C. Two tetragonal phases (t- and t{prime}-phases) were observed after quenching samples heated at 1690{degrees}C to a room temperature, whereas one t-phase and cubic (c-) phase were found in those treated at 1315{degrees}C. Since the t{prime}- phase is obtained through a diffusionless transformation during cooling from a high-temperature c-phase, t- and c- phases can coexist at high temperature. The t- and c-phases field spans from 4 to 10 mol% ErO{sub 1.5} at 1690{degrees}C and from 3 to 15 mol% ErO{sub 1.5} at 1315{degrees}C. The equilibrium temperature T{sub 0} {sup t{minus}m} between the t- and monoclinic (m-) phases estimated from A{sub s} and M{sub s} temperatures decreased with increasing ErO{sub 1.5} contents.

• OSTI ID: 5193459
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 74:3; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ERBIUM OXIDES
MELTING
PHASE TRANSFORMATIONS
QUENCHING
ZIRCONIUM OXIDES
HIGH TEMPERATURE
MARTENSITE
PHASE DIAGRAMS
ALLOYS
CARBON ADDITIONS
CHALCOGENIDES
DIAGRAMS
ERBIUM COMPOUNDS
IRON ALLOYS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies