Preparation method of colored zirconia ceramics

Abstract

The invention discloses a preparation method of colored zirconia ceramics, which belongs to the field of doped ceramic material preparation. The method comprises the following steps that: stabilizer and colorant are added into the suspension of zirconia powder by the mixture ratio of 850 to 980 parts of zirconia powder, 10 to 50 parts of stabilizer and 10 to 120 parts of colorant; by controlling the pH value of the solution or using various precipitant, the stabilizer and the colorant are precipitated on the surface of the zirconia powder; the solution is filtered and dried; the obtained powder is ground, screened, formed, degreased and sintered to obtain the colored zirconia ceramics. In nano-scale, the preparation method realizes the homogeneous compounding of the stabilizer, the colorant and the nano zirconia powder, can greatly reduce the volatilization of the colorant in the high-temperature sintering phase of the zirconia ceramics, has uniform sample color and good repeatability, and the colored zirconia ceramics prepared by the method can be widely applied to arts and crafts decoration, clocks and watches, mobile phone cases, jewelry and other fields.

Description

technical field [0001] The invention belongs to the field of preparation of doped ceramic materials, in particular to a preparation method of colored zirconia ceramics. Background technique [0002] The phase change toughened polycrystalline zirconia ceramic material with yttrium or cerium as a phase stabilizer has many excellent characteristics: 1) high hardness, Mohs hardness reaches 7; 2) high strength, room temperature compressive strength can reach 2100MPa, anti The bending strength reaches 600-1400MPa, and it is reported that the best toughened zirconia ceramics can even reach 2000MPa; 3) Good toughness, the toughness of zirconia reaches 9-15MPa m 1 / 2 , superior to other structural ceramics such as alumina and silicon carbide; 4) Good chemical stability, strong corrosion resistance, no reaction with human body fluids, and no side effects in close contact with the human body. Therefore, phase transformation toughened polycrystalline zirconia ceramics are widely used in...

AI Technical Summary

Problems solved by technology

[0005] 1) The color is uneven, and the method of mechanical mixing is difficult to disperse the colorant evenly in the ceramic matrix. Therefore, after sintering, the color of the appearance of the sample is uneven, resulting in low yield and poor appearance, which cannot be practically applied;

[0006] 2) The repeatability is poor, the effect of different batches of mechanical mixing is difficult to be consistent, and the mixing effect of powders with different particle sizes is also different, resulting in poor repeatability of the color of the sample after sintering;

[0007] 3) Transition metal oxides, which are generally used as colorants, volatilize in large quantities during high-temperature sintering (1300-1550°C), which is likely to cause uneven coloring and volatile pollution. At the same time, the volatilization of colorants also causes Increased energy consumption and preparation costs

And these two methods are not widely used, only a single black zirconia ceramic can be prepared