Composition for alumina ceramics, alumina ceramics and preparation method of alumina ceramics

The invention relates to the field of alumina ceramics and discloses composition used for preparing alumina ceramics. The composition comprises alumina, zirconia and silicon dioxide; 100 parts of the composition by weight comprise 95-99 parts of alumina, 0.5-3 parts of zirconia and 0.5-3 parts of silicon dioxide. The invention further provides a preparation method of the alumina ceramics and the alumina ceramics prepared with the method. The composition which is prepared with a specific formula and used for the alumina ceramics is used for preparing the alumina ceramics, the formula of main materials can be simplified, the toughness of the alumina ceramics can be effectively improved, and the hardness of the alumina ceramics is guaranteed. Besides, preferably, alumina with special grain sizes, specific pressure forming and specific heating temperature, sintering temperature, sintering time and cooling speed are used, the toughness of the alumina ceramics can be better guaranteed, and the work conditions required for wear resistance and impact resistance are effectively met.