Phase stability and physical properties of cubic and tetragonal ZrO sub 2 in the system ZrO sub 2 -Y sub 2 O sub 3 -TA sub 2 O sub 5

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb04302.x· OSTI ID:7000017

Kim, D J ^[1]; Tien, T Y ^[2]

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1. Ceramics Div., Korea Inst. of Science and Technology, Seoul (KR)
2. Michigan Univ., Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

This paper reports on the cubic (c-Zr-O{sub 2}) and tetragonal zirconia (t-ZrO{sub 2}) phase stability regions in the system ZrO{sub 2}-Y{sub 2}O{sub 3}-Ta{sub 2}O{sub 5} were delineated. The c-ZrO{sub 2} solid solutions are formed with the fluorite structure. The t-ZrO{sub 2} solid solutions having a c/a axial ratio (tetragonality) smaller than 1.0203 display high fracture toughness (5 to 14 MPa {center dot} m{sup 1/2}), and their instability/transformability to monoclinic zirconia (m-ZrO{sub 2}) increase with increasing tetragonality. On the other hand, the t-ZrO{sub 2} solid solutions stabilized at room temperature with tetragonality greater than 1.0203 have low toughness values 2 to 5 MPa {center dot} m{sup 1/2}, and their transformability is not related to the tetragonality.

• OSTI ID: 7000017
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:12; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DISPERSIONS
KINETICS
LATTICE PARAMETERS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHASE STABILITY
PHYSICAL PROPERTIES
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
STABILITY
SYNTHESIS
TANTALUM COMPOUNDS
TANTALUM OXIDES
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES