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Zirconia ceramic preparation method and zirconia ceramic prepared according to method

A zirconia ceramic and solution technology is applied in the field of preparation of zirconia ceramics.

Inactive Publication Date: 2019-06-04
山西朔神新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the increase of the low-temperature eutectic phase and more additives, the cubic stable phase of zirconia increases, both of which affect the phase transition self-toughening mechanism of zirconia ceramics, and the fracture toughness of zirconia ceramics decreases.

Method used

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preparation example Construction

[0027] The invention discloses a preparation method of zirconia ceramics, the zirconia ceramics comprises: ZrO 2 95-99mol%, Y 2 o 3 1-5mol%, the preparation method includes the following steps (1)-step (5).

[0028] step 1). Calculate and weigh the corresponding mass of ZrOCl according to the composition of zirconia ceramics 2 ·8H 2 O and YCl 3 , where 2 / 3 of the mass of ZrOCl 2 ·8H 2 O and distilled water are mixed with solution A, and the concentration of described solution A is 0.5-2.5 mol / L, is preferably 1-2 mol / L, is more preferably 1.5-2 mol / L; ZrOCl of remaining 1 / 3 quality 2 ·8H 2 O and YCl 3 Prepare solution B with distilled water, the concentration of said solution B is 0.1-1.5 mol / L, preferably 0.1-1 mol / L, more preferably 0.5-1 mol / L; the concentration of solution A is greater than the concentration of solution B.

[0029] Step (2). In the solution A, adding a gum arabic solution with a concentration of 5-10wt% in an amount of 5-10% of the solution A ...

Embodiment 1

[0039] Zirconia ceramics contain: ZrO 2 98mol%, Y 2 o 3 2mol%, prepared according to the following method:

[0040] (1) Calculate and weigh the corresponding mass of ZrOCl according to the composition of zirconia ceramics 2 ·8H 2 O and YCl 3 , where 2 / 3 of the mass of ZrOCl 2 ·8H 2 O and distilled water are mixed with solution A, and the concentration of described solution A is 1.5 mol / L; The ZrOCl of remaining 1 / 3 quality 2 ·8H 2 O and YCl 3 and distilled water to prepare solution B, the concentration of the solution B is 0.5 mol / L.

[0041] (2) Add a gum arabic solution with a concentration of 10wt% to solution A, and the amount added is 5% of the mass of solution A; under stirring, add ammonia water C1 with a concentration of 15% to solution A dropwise to obtain a suspension D, control the dropwise amount of ammonia water C1 to make the pH value of the suspension D be 9-10.

[0042] (3) Add solution B and ammonia water C2 dropwise to suspension D at the same ti...

Embodiment 2

[0046] Zirconia ceramics contain: ZrO 2 98mol%, Y 2 o 3 2mol%, prepared according to the following method:

[0047] (1) Calculate and weigh the corresponding mass of ZrOCl according to the composition of zirconia ceramics 2 ·8H 2 O and YCl 3 , where 2 / 3 of the mass of ZrOCl 2 ·8H 2 O and distilled water are mixed with solution A, and the concentration of described solution A is 2 mol / L; The ZrOCl of remaining 1 / 3 quality 2 ·8H 2 O and YCl 3 Prepare solution B with distilled water, and the concentration of described solution B is 1 mol / L.

[0048] (2) Add a gum arabic solution with a concentration of 8wt% to solution A, and the amount added is 10% of the mass of solution A; under stirring, add ammonia water C1 with a concentration of 10% to solution A dropwise to obtain a suspension D, control the dropwise amount of ammonia water C1 so that the pH of the suspension D is 8-9.

[0049] (3) Add solution B and ammonia water C2 dropwise to suspension D at the same time ...

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626C04B35/64
Inventor 柴有权杨支朋席新杰
Owner 山西朔神新材料科技有限公司
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