| 摘要 |
Method for preparing an alumina ceramic article comprising: (a) compacting a mixture of a first concentration of particulate aluminium oxide and a second concentration of particulate zirconium oxide alloy to form a blank, where the first concentration is 50-75 wt.% of the total of first and second concentrations; (b) sintering the blank in contact with a dopant oxide selected from MgO, ZnO, FeO, CoO, NiO and MnO, where the dopant oxide diffuses into the shell of the blank converting the aluminium oxide particles into cubic spinel and the zirconium oxide alloy particles from a tetragonal crystal structure to cubic and monoclinic crystal structures. The resulting ceramic article has a core of sintered particles of aluminium oxide and zirconium oxide alloy in a tetragonal crystal structure, and a shell of sintered particles of cubic spinel and zirconium oxide alloy in non-tetragonal crystal structures. |
