Young`s modulus, flexural strength, and fracture of yttria-stabilized zirconia versus temperature

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

OSTI ID:509234

Adams, J W ^[1]; Ruh, R; Mazdiyasni, K S ^[2]

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1. IIT Research Inst., Chicago, IL (United States)
2. Wright Lab., Wright-Patterson AFB, OH (United States)

The flexural strength and elastic modulus of cubic zirconia that was stabilized with 6.5 mol % yttria was determined in the temperature range of 25--1,500 C in air. Specimens were diamond machined from both hot-pressed and sintered billets that were prepared from alkoxy-derived powders. The flexural strength of the hot-pressed material decreased, from {approximately}300 MPa at 25 C to 50 MPa at 1,000 C, and then increased slightly as the temperature increased to 1,500 C. The flexural strength of the sintered material decreased, from {approximately}150 MPa at 25 C to 25 MPa at 750 C, and then appeared to increase slightly to 1,500 C. Flexural strengths were comparable to other fully stabilized zirconia materials. The overall fracture mode was transgranular at low temperatures, mixed mode at {approximately}500--1,000 C, and intergranular at higher temperatures. Pores or pore agglomerates along grain boundaries and at triple points were fracture origins. The value of the porosity-corrected Young`s moduli was 222 GPa at 25 C, decreased to {approximately}180 GPa at 400 C, and then was relatively constant with increasing temperature to 1,350 C.

• Sponsoring Organization: Department of the Air Force, Washington, DC (United States)
• OSTI ID: 509234
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FLEXURAL STRENGTH
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HOT PRESSING
MECHANICAL PROPERTIES
POROSITY
SINTERING
YOUNG MODULUS
YTTRIUM OXIDES
ZIRCONIUM OXIDES