Artificial femoral ball head with multi-layer shell core composite structure

An artificial femoral ball head (2) having a multilayer shell-core composite structure, comprising:

• a spherical shell layer (2-1), a transition layer (2-5) and an inner core (2-2);
• wherein the inner core (2-2) is made of a toughened ceramic material, the spherical shell layer (2-1) is made of a ceramic material, the transition layer (2-5) is made of a composite material comprising materials of the inner core (2-2) and the spherical shell layer (2-1);
• wherein the ceramic material of the spherical shell layer (2-1) comprises high-purity and superfine alumina ceramic, the composite material of the transition layer (2-5) comprises ZrO2(3Y2O3) with 80 vol. % Al2O3, and the toughened ceramic material of the inner core (2-2) comprises ZrO2(3Y2O3) with 20 vol. % Al2O3;
• wherein the artificial femoral ball head (2) is manufactured through sintering a green body of successively stacked layers of the spherical shell layer (2-1), the transition layer (2-5) and the inner core (2-2), and the green body of successively stacked layers of the spherical shell layer (2-1), the transition layer (2-5) and the inner core (2-2) is obtained through a powder co-injection molding process.