Zirconia ceramic preparation method and zirconia ceramic prepared according to method

Abstract

The invention relates to a zirconia ceramic preparation method, which comprises: sequentially carrying out forward drip co-precipitation and reverse drip co-precipitation by controlling the concentrations of a ZrOCl2.8H2O solution and ammonia water, washing the precipitate, drying, calcining to obtain primary zirconia powder with wide particle size distribution, carrying out ball milling, granulating, molding, sintering, and annealing to obtain the zirconia ceramic. With the preparation method of the present invention, the sintering shrinkage rate of the zirconia ceramic can be effectively reduced while the high fracture toughness can be maintained. The present invention further relates to the zirconia ceramic prepared according to the preparation method.

Description

technical field

[0001] The invention relates to a method for preparing zirconia ceramics, in particular to a method for preparing zirconia ceramics with low sintering shrinkage and high fracture toughness. The present invention further relates to a zirconia ceramic prepared according to the above preparation method. Background technique

[0002] Zirconia ceramics have excellent properties such as high toughness, high bending strength and high wear resistance, so they are widely used in the field of structural ceramics. In recent years, zirconia ceramics have been used more and more in the fields of ceramic knives, ceramic shafts / bearings, ceramic sleeves, and mobile phone ceramic shells. However, during the preparation process, zirconia ceramics will have a large volume shrinkage after sintering, and the sintering shrinkage rate is usually greater than 20%. On the one hand, a large volume shrinkage rate is very easy to produce defects in zirconia ceramics, and even cause c...