CeO_2添加正方晶ジルコニアの弾性率及び破壊靭性

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The lattice constants, elastic modulus and fracture toughness of 12 mol% CeO_2 containing tetragonal zirconia Polycrystals with grain sizes of 2.8 μm (sintered at 1500℃, Z12C Iand 6.1μm (sintered at 1600℃, Z12C-II) were measured. Lattice constants (at and etaxes) of tetragonal zirconia for Z12C-II were larger than those for Z12C-I. On the other hand) the axial ratio c_t/ √<2> a_t for Z12C-II was smaller than that for Z12C-I. Therefore, it was estimated that tetragonal zirconia in Z12C-II: was more stable than that in Z12C-I. Young's modulus at room temperature was 194-195 GPa for both specimens. The effect of grain size on Young's modulus was not observed. The Young's modulus decreased with increasing temperature and was 179-180 GPa at 400℃. Fracture tough nesses at room temperature were 6.4 MPa・m^<1/2> for Z12C-I and 6.7 MPa・m^<1/2> for Z12C-II That is, fracture toughness with a large grain size was larger than that with a small grain size. The fracture toughness decreased gradually with increasing temperature and was 4.0MPa'ml/2 for Z12C 1 and 4.2 MPa・m^<1/2> for Z12C-II at 300℃. The monoclinic zirconia content on the fracture surface for Z12C-I: with large grain size was comparable to that for Z12C I with small grain size at room temperature. Fracture modes in Z12C-I was characterized by intergranular mode and that in Z12C-I: , by transgranular mode. It is concluded that the fracture toughness for Z12C-II was larger than that for Z12C-II because of the difference in fracture modes.
社団法人日本セラミックス協会の論文
1994-02-01

CeO_2添加正方晶ジルコニアの弾性率及び破壊靭性

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