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Evaluation of Tensile Strength and Fracture Toughness of Yttria‐Stabilized Zirconia Polycrystals with Fracture Surface Analysis
Author(s) -
Oishi Manabu,
Matsuda Yukihisa,
Noguchi Kenichi,
Masaki Takaki
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08471.x
Subject(s) - materials science , fracture toughness , cubic zirconia , ultimate tensile strength , composite material , electron microprobe , fracture (geology) , scanning electron microscope , yttria stabilized zirconia , metallurgy , ceramic
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 A1 2 O 3 , A1 2 O 3 with SiO 2 , and cubic‐ZrO 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 calculated from the tensile strength and analysis of the fracture origins was 3.4 to 3.7 MPa √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.