Preparation method of low-cost zirconium dioxide toughened alumina ceramic granular powder

An alumina ceramic and zirconia technology, which is applied in the field of ceramic wear-resistant materials, can solve the problems of inconvenient mass production, complex technological process, environmental pollution, etc., and achieves easy automatic operation, high purity and good wear resistance. Effect

Inactive Publication Date: 2014-12-10
SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] (1) The production cost is high, and the raw materials used are all reagent grade;
[0016] (2) The envi...

Method used

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  • Preparation method of low-cost zirconium dioxide toughened alumina ceramic granular powder
  • Preparation method of low-cost zirconium dioxide toughened alumina ceramic granular powder
  • Preparation method of low-cost zirconium dioxide toughened alumina ceramic granular powder

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Effect test

Embodiment 1

[0043] The preparation method of the zirconia toughened alumina ceramic granulated powder of the present invention, the specific steps are as follows:

[0044] (1) With 3mol% yttrium oxide stabilized zirconia powder (D90 is less than 0.5 micron), microcrystalline alumina powder (D90 is less than 2.0 micron) and binding agent (the mixture of magnesium nitrate and magnesium carbonate, the mass ratio of the two is 1:1) as the main raw material, with deionized water as the dispersion medium, ball milling and mixing for 3 hours at room temperature to obtain a uniform mixed slurry; among them, 3mol% yttria-stabilized zirconia powder and microcrystalline alumina powder The mass ratio of the material is 30:70, the amount of the binder accounts for 1.0% of the total mass of the powder, and the mass ratio of the powder to deionized water is 1:1;

[0045] (2) Transfer the mixed slurry obtained in step (1) to a mixing tank, add a binder, and stir to obtain a uniform slurry after stirring ...

Embodiment 2

[0049] As in Example 1, the difference is that the mass ratio of 3mol% yttria-stabilized zirconia powder to microcrystalline alumina powder is 25:75, and the amount of binder accounts for 1.5% of the total mass of the powder. It is carboxymethyl cellulose, the amount of which accounts for 0.2% of the total mass of the powder, ball milling for 2 hours, stirring for 2 hours, the temperature of the air inlet of the spray granulation tower is 300°C, and the temperature of the air outlet is 80°C; The measured flexural strength of the final ceramic is 810.31MPa, and the fracture toughness is 8.96MPa m 1 / 2 .

Embodiment 3

[0051] As in Example 1, the difference is that the mass ratio of 3mol% yttria-stabilized zirconia powder to microcrystalline alumina powder is 20:80, and the amount of binder accounts for 0.75% of the total mass of the powder. (The mass ratio of polyvinyl alcohol and carboxymethyl cellulose is 1:1). The addition amount accounts for 0.1% of the total mass of the powder, the ball mill is mixed for 5 hours, stirred for 1 hour, and the air inlet temperature of the spray granulation tower is 300 ℃, the air outlet temperature is 90℃; the flexural strength of the fired ceramics is 807.65MPa, and the fracture toughness is 7.87MPa m 1 / 2 .

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Abstract

The invention relates to a preparation method of low-cost zirconium dioxide toughened alumina ceramic granular powder, belonging to the technical field of ceramic wear-resistant materials. The method comprises the following steps: by using 3 mol% yttrium-oxide-stable zirconium dioxide powder, microcrystalline alumina powder and binder as main raw materials and water as a dispersion medium, carrying out ball milling and mixing at room temperature to obtain a uniformly mixed paste; transferring the mixed paste into a stirring barrel, adding the adhesive, and stirring to obtain a uniformly mixed slurry; and carrying out pressure atomization or centrifugal atomization on the slurry in a spray granulation tower, and carrying out spray granulation to obtain the granular powder. The spray granulation technique and equipment are simple and cheap, and can easily implement automatic operation. The prepared zirconium dioxide toughened alumina ceramic granular powder has the advantages of high purity, favorable sphericity, fine original grain size and favorable formability.

Description

technical field [0001] The invention relates to a preparation method of low-cost zirconia toughened alumina ceramic granulated powder, which belongs to the technical field of ceramic wear-resistant materials. Background technique [0002] Advanced ceramics are also called high-tech ceramics, fine ceramics, new ceramics, modern ceramics, high-performance ceramics, special ceramics, engineering ceramics, etc. Advanced ceramics are developed on the basis of traditional ceramics, but far beyond the scope of traditional ceramics, it is a revolutionary change in the history of ceramic development. Advanced ceramics can be divided into two categories: structural ceramics and functional ceramics. Due to a series of excellent properties, advanced structural ceramic materials have played an active role in saving energy, saving precious metal resources, promoting environmental protection, improving production efficiency, prolonging the life of machinery and equipment, and ensuring the...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/626
Inventor 侯宪钦王光强陈杰刘学燕
Owner SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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