Patent ID: 8383236

Claim:
A zirconia sintered body comprising: a zirconia in the range from 66 to 90 parts by mass, the zirconia containing an yttrium compound as a stabilizer; and oxides of iron, chromium and titanium in total in the range from 10 to 34 parts by mass, wherein among the oxides of iron, chromium and titanium, a proportion of the oxides of iron is in the range from 70 to 99.5% by mass, a proportion of the oxides of chromium is in the range from 0.4 to 20% by mass and a proportion of the oxides of titanium is in the range from 0.1 to 10% by mass, wherein the combined proportion of tetragonal and cubic crystal phases in the zirconia crystal phase is not less than 90%, and wherein the zirconia has an average crystal grain size of from 0.3 to 0.5 μm and the oxides of iron, chromium and titanium have an average crystal grain size of from 0.5 to 2.0 μm.