Preparation method of large size MAX phase ceramic impeller

The invention provides a preparation method of a large size MAX phase ceramic impeller. The preparation method is capable of preparing the large size MAX phase ceramic impeller with complex shape characteristics. According to the preparation method, gel injection moulding technology is adopted, argon gas and A-enriched atmosphere are introduced as sintering protection atmosphere, and pressurelesssolid-phase sintering of MAX phase ceramic impeller is carried out. The preparation method comprises following steps: ceramic slurry preparation, mould injection, demoulding, drying, green compact processing, degumming, pressureless sintering, and polishing and refining. The preparation method is capable of solving difficult technological problems in the prior art that settlement is easily causedbecause of large MAX ceramic slurry density, and cracking and deformation are easily caused in drying and sintering process; and successive preparation of the large size MAX phase ceramic impeller isrealized at last. The large