| 摘要 |
PURPOSE:To improve the extent of strength in a specified temperature range as well as to aim at reduction in secular deterioration by using such zirconia porcelain that consists of ZrO2 and Y2O3, specifying a mole ratio of Y2O3/ZrO2, and sets mean grain size to be less than the specified one, as a solid electrolyte. CONSTITUTION:In the case of ZrO2-Y2O3 zirconia porcelain, such a tetragonal crystal grain that a mole ratio of Y2O3/ZrO2 is within the range of 2/98-4/96, and mean grain size is less than 2mu is used. This zirconia porcelain is used as a solid electrolyte, installing an electrode, and an oxygen concentration cell is produced. With this constitution, since tetragonalness stably exists there without entailing any phase transformation into a monocline at a temperature range from 500 deg.C to room temperature, higher strength is secured and, what is more, secular deterioration also becomes lessened. |
