Preparation method of colored zirconia ceramics

A technology of zirconia ceramics and zirconia powder, which is applied in the field of preparation of doped ceramic materials, can solve the problems of increased preparation cost, poor repeatability, and limited application range, and achieves obvious mixing effect, uniform and stable color, and widened The effect of the field of application

Inactive Publication Date: 2010-09-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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, r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, yttrium-stabilized zirconia powder with an average particle size of 500nm is used as raw material, and 100 grams of yttrium-stabilized zirconia powder is taken and dispersed in 300 ml of water by stirring to form a stable suspension; 1.2 g of magnesium chloride is dissolved in water Prepare 15ml of magnesium chloride aqueous solution, and slowly add it dropwise to the suspension of zirconia powder; then use 1mol / L sodium hydroxide solution to adjust the pH of the solution to 10; then add 30ml containing 0.8g of nickel sulfate and 0.3g of chromium chloride aqueous solution, mixed uniformly;

[0031] After filtering the above solution, put the powder in a drying oven and dry it at 80°C, then grind the dried powder finely with a mortar, and pass through an 80-mesh sieve; add 10ml of 4% poly Vinyl alcohol solution, granulated and passed through a 60-mesh sieve, and pressed into discs with a dry press. Keep warm at 350°C for 2 hours to remove the binder ...

Embodiment 2

[0033] In this example, yttrium-stabilized zirconia powder with an average particle size of 600nm is used as raw material, and 100 grams of yttrium-stabilized zirconia powder is taken and dispersed in 300 ml of aqueous solution by stirring to form a stable suspension; 1.5 g of aluminum nitrate is dissolved in Make 15ml aluminum nitrate aqueous solution in water, slowly add it dropwise to the suspension of zirconia powder, then adjust the pH value of the solution to 9.5 with 1mol / L ammonium bicarbonate solution, then add 40ml containing 0.7g cobalt sulfate, 0.4g An aqueous solution of chromium nitrate and 0.5g manganese chloride;

[0034] After filtering the above solution, put the powder in a drying oven and dry it at 80°C, then grind the dried powder finely with a mortar, and pass through an 80-mesh sieve; add 10ml of 4% poly Vinyl alcohol solution, granulated through a 60-mesh sieve, and pressed into discs with a dry press. Insulate at 350°C for 2 hours to remove the binder...

Embodiment 3

[0036] In this example, cerium-stabilized zirconia powder with an average particle size of 400nm is used as a raw material. Take 100 grams of cerium-stabilized zirconia powder and disperse it in 300 ml of aqueous solution by stirring to form a stable suspension. Then add 1.2 g of aluminum nitrate Dissolve in water to make 15ml aluminum nitrate aqueous solution, slowly add dropwise to the suspension of zirconia powder, adjust the pH value of the solution to 9.5 with 1mol / L sodium hydroxide solution, then add 30ml containing 1.2g tin sulfate and 1.5g The aqueous solution of ferric chloride, in order to better precipitate tin ions, then add 20ml 0.1mol / L ammonium sulfide solution and 20ml 0.5mol / L ammonia water to the solution dropwise to ensure that the pH value is stable at around 9.5.

[0037] After filtering the above solution, put the powder in a drying oven and dry it at 80°C, then use a mortar to grind the dried powder finely, pass through a 80-mesh sieve; add 10m14% polyethy...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622
Inventor 谢志鹏王巍
Owner TSINGHUA UNIV
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