Y_2O_3安定化ZrO_2の引張破壊と破壊じん性(<特集>セラミックスの合成と評価)

概要

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The tensile strength of yttria-stabilized tetragonal zirconia polycrystals (Y-TZPs) was messured and the fracture surfaces were analyzed by SEM-XMA. The fracture toughness K_<IC, SEPB> and the crack extension resistance curve (R-curve) were evaluated by the single-edge-precracked-beam(SEPB) and the double cantilever beam(DCB) methods, respectively. The fracture toughness, K_<IC, slopel> evaluated from the tensile strength and the fracture surface analysis shows 3.4 to 3.7 MPa√<m> which is much smaller than K_<IC, SEPB>(5.0 to 5.2MPa√<m>). The type of R-curve is a rising one, and K_<IC, slopel> and K_<IC, SEPB> are close to the initial and the saturated values of the R-curve, respectively. The fracture origins of the SEPB and the tensile test specimens are a relatively large precrack and a small natural flaw, respectivery. Therefore, the value of fracture toughness of the Y-TZPs with a rising R-curve depends on the size of fracture origin.
社団法人日本材料学会の論文
1995-06-15