ジルコニア・アルミナ複合セラミックスの3軸残留相応力のX線測定

抄録

The X-ray diffraction method was used to measure the residual stress in composite ceramics of zirconia mixed with various volume fractions of alumina. The triaxial state of the residual stress in each phase was determined from the X-ray diffractions of Al₂O₃ (146) by Cu-Kα radiation and of ZrO₂ (133) by Cr-Kα radiation. In as-sintered materials, the residual stress in the alumina phase was compression, and decreased linearly with the alumina volume fraction V_f. On the other hand, the tensile residual stress was observed in the zirconia phase, and increased linearly with V_f. Those residual stresses were due to the mismatch of the coefficient of thermal expansion. The theoretical prediction based on Eshelby's inclusion mechanics agreed well with the experimental results.