System Zirconia-Scandia

Journal Article · Fri Dec 31 23:00:00 EST 1976 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1977.tb15521.x· OSTI ID:6489389

Ruh, R ^[1]; Garrett, H J; Domagala, R F; Patel, V A

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1. Wright-Patterson Air Force Base, OH

The system zirconia-scandia was investigated using x-ray diffraction analysis, differential thermal analysis, metallographic analysis, and melting point studies. Results reveal the monoclinic ..cap alpha../sub 1/ phase (0 to 2 mol % Sc/sub 2/O/sub 3/), the tetragonal ..cap alpha../sub 2/' phase (5 to 8% Sc/sub 2/O/sub 3/), the rhombohedral ..beta.. phase (9 to 13% Sc/sub 2/O/sub 3/), the rhombohedral ..gamma.. phase (15 to 23% Sc/sub 2/O/sub 3/), the rhombohedral delta phase (24 to 40% Sc/sub 2/O/sub 3/), and the cubic epsilon phase (77.5 to 100% Sc/sub 2/O/sub 3/). The monoclinic ..cap alpha../sub 1/ phase and the tetragonal ..cap alpha../sub 2/' phase were found to transform to the tetragonal ..cap alpha../sub 2/ phase over a wide temperature range depending on composition. The ..beta.., ..gamma.., and ..cap alpha.. phases transformed to a cubic phase at temperatures of approx. = 600/sup 0/, 1100/sup 0/, and 1300/sup 0/C, respectively. A maximum melting point of approx. = 2870/sup 0/C was found at approx. = 10% Sc/sub 2/O/sub 3/ and a eutectic at approx. = 2400/sup 0/C at 55% Sc/sub 2/O/sub 3/.

• OSTI ID: 6489389
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 60:9-10; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ANNEALING
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIAGRAMS
DIFFRACTION
HEAT TREATMENTS
LATTICE PARAMETERS
MELTING POINTS
METALLOGRAPHY
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUENCHING
SCANDIUM COMPOUNDS
SCANDIUM OXIDES
SCATTERING
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES