By using industrial zirconia and alumina as raw materials, ultrafine grinding, strict control of raw material particle size, and conventional processes, high-strength and high toughness zirconia alumina composite ceramics can be produced.
The research results indicate that adding alumina to the zirconia matrix can effectively inhibit the growth of zirconia grains, which is beneficial for the existence of metastable tetragonal zirconia grains, thereby improving the strength and fracture toughness of the material. When the mass fraction of alumina is 20%, the flexural strength of the composite ceramic reaches 676.7MPa, and the fracture toughness reaches 10MPa/m ². The combination of phase transformation toughening and particle dispersion toughening enhances the mechanical properties of composite ceramic materials.
Preparation of alumina micro powder by thermal decomposition method, preparation of zirconia ultrafine powder by chemical co precipitation method, and preparation of zirconia/alumina composite ceramics through appropriate processes. It is believed that adding alumina can inhibit the growth of zirconia grains and improve the strength and toughness of the matrix. When the mass fraction of alumina reaches 30%, the flexural strength of yesterday phase ceramics fired at 1600 ℃ is 968MPa, and the fracture toughness is 13.7MPa/cm ².
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