| abstract |
Title:n ALUMINA-ZIRCONIA FRITTED BALLSn n Sintered ball showing:n - the following crystallographic composition, in percentages by mass on the basis of the total mass of the crystallized phases and for a total of 100%:n - zircon <25%;n - 50% ≤ cubic zirconia + quadratic zirconia ≤ 95%, the cubic zirconia content being greater than 50%, the cubic zirconia content being the mass ratio (cubic zirconia / (cubic zirconia + quadratic zirconia));n - 0 ≤ monoclinic zirconia ≤ (10 - 0.2 * quadratic zirconia)%;n - 5% ≤ corundum ≤ 50%;n - crystallized phases other than zircon, cubic zirconia, quadratic zirconia, monoclinic zirconia and corundum <10%;n - the following chemical composition, in percentages by mass based on the oxides:n 34% ≤ ZrO2 + HfO2, ZrO2 + HfO2 being the complement to 100%;n HfO2 ≤ 4.0%;n 0.5% ≤ SiO2 ≤ 14.1%;n 4.5% ≤ Al2O3 ≤ 49.6%;n 2.75% ≤ Y2O3 ≤ 22.8%;n MgO ≤ 5%;n CaO ≤ 2%;n oxides other than ZrO2, HfO2, SiO2, Al2O3, MgO, CaO and Y2O3 <5.0%.n No abstract figure |