Evaluation of tensile strength and fracture toughness of yttria-stabilized zirconia polycrystals with fracture surface analysis

Journal Article · Mon May 01 04:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08471.x· OSTI ID:69617

Oishi, Manabu; Matsuda, Yukihisa ^[1]; Noguchi, Kenichi; Masaki, Takaki ^[2]

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1. Toray Research Center, Inc., Shiga (Japan)
2. Toray Industries, Inc., Shiga (Japan)

The tensile strength of yttria-stabilized tetragonal zirconia polycrystals (Y-TZPs) was measured and the fracture surfaces were analyzed with the scanning electron microscope and X-ray microanalyzer. The fracture origins of the pressureless-sintered samples were voids or inclusions such as Al{sub 2}O{sub 3}, Al{sub 2}O{sub 3} with SiO{sub 2}, and cubic-ZrO{sub 2}, while the fracture origins of the hot isostatically pressed samples were inclusions; no voids were detected at fracture origins. The higher strengths of the hot isostatically pressed samples versus those of the pressureless-sintered samples were consistent with the change in fracture origins. The fracture toughness of the samples calculate from the tensile strength and analysis of the fracture origins was 3.4 to 3.7 MPa {center_dot}{radical}m. These values are lower than those measured with the SEPB method. These discrepancies might be caused by the difference in the state of the fracture origin and its neighborhood, such as the size of the fracture origin and interaction between two surfaces in the precrack.

• Sponsoring Organization: USDOE
• OSTI ID: 69617
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACKS
DEFECTS
FRACTURE PROPERTIES
HOT PRESSING
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
SINTERING
TENSILE PROPERTIES
VOIDS
YTTRIUM OXIDES
ZIRCONIUM OXIDES