Preparation method of nano zirconia coated alumina powder

A technology of alumina powder and nano-zirconia is applied in the field of preparation of nano-zirconia-coated alumina powder, which can solve the problems of high production cost, difficulty in mass production, zirconia aggregation, etc. Solve the effect of suspension, high surface activity and dispersibility

Inactive Publication Date: 2015-06-24
江苏金石研磨有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ZTA ceramic powder obtained by mechanical mixing, zirconia and alumina powder are mixed unevenly, prone to aggregation of zirconia, poor dispersion, and cannot fully exert the toughening effect of zirconia
Other preparation methods, such as sol-gel method, hydrothermal method, etc., often have high production costs and low yields, making it difficult to achieve large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At first the aqueous solution is heated to 90 degrees Celsius, first adding molecular weight is 4000 polyethylene glycol, then adding molecular weight is 20000 ammonium polymethacrylate, finally adding molecular weight is 60000 polyethylene glycol, the mass ratio of the three is 1: 3:2, stir to dissolve and clarify, and get a composite dispersant for alumina after cooling.

[0022] Weigh 250L of water and add it to the oil bath reactor. Weigh zirconium oxychloride and yttrium chloride according to the molar ratio of 97:3, and prepare a 0.75 mol / L solution. Then add urea to the solution, the molar concentration of urea is 3mol / L. Then add a pre-prepared aluminum oxide composite dispersant to the solution, wherein the composition of the dispersant and its mass proportion in the solution are: 0.1% polyammonium methacrylate (molecular weight: 20000), 0.3% polyethylene glycol (molecular weight 4000), 0.2% polyethylene glycol (molecular weight 60000). Turn on high-speed st...

Embodiment 2

[0025] At first the aqueous solution is heated to 95 degrees Celsius, first adding molecular weight is 4000 polyethylene glycol, then adding molecular weight is 20000 polyammonium methacrylate, finally adding molecular weight is 60000 polyethylene glycol, the mass ratio of the three is 2: 1:3, stir to dissolve and clarify, and get a composite dispersant for alumina after cooling.

[0026] Weigh 200L of water and add it to the oil bath reactor. According to the molar ratio of 97:3, zirconium oxychloride and yttrium chloride were weighed to prepare a 0.3 mol / L solution. Then hexamethylenetetramine was added into the solution, and the molar concentration of hexamethylenetetramine was 3 mol / L. Then add a pre-prepared aluminum oxide composite dispersant to the solution, wherein the composition of the dispersant and its mass proportion in the solution are: 0.2% polyammonium methacrylate (molecular weight: 20000), 0.1% polyethylene glycol (molecular weight 4000), 0.3% polyethylene ...

Embodiment 3

[0029] At first the aqueous solution is heated to 85 degrees centigrade, first adding molecular weight is 4000 polyethylene glycol, then adding molecular weight is 20000 ammonium polymethacrylate, finally adding molecular weight is 60000 polyethylene glycol, the mass ratio of the three is 1: 2:2, stir to dissolve and clarify, and get a composite dispersant for alumina after cooling.

[0030] Weigh 300L of water and add it to the oil bath reactor. Weigh zirconium oxychloride and yttrium chloride according to the molar ratio of 97:3, and prepare a 0.5 mol / L solution. Then add urea to the solution, the molar concentration of urea is 4mol / L. Then add the aluminum oxide composite dispersant prepared in advance to the solution, wherein the composition of the dispersant and the mass proportion in the solution are: 0.1% polyammonium methacrylate (molecular weight: 20000), 0.2% polyethylene glycol (molecular weight 4000), 0.2% polyethylene glycol (molecular weight 60000). Turn on hi...

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Abstract

The invention discloses a preparation method of nano zirconia coated alumina powder. The preparation method comprises the steps of by taking alumina as a main material, preparing zirconium oxychloride and yttrium chloride into a mixed solution; by taking urea or hexamethylenetetramine as a homogenous precipitation agent, carrying out temperature regulation to form a zirconium hydroxide coating layer on the surface of the alumina; and carrying out spray drying on the obtained object so as to obtain precursor powder, and calcining the precursor powder to obtain the nano zirconia coated alumina powder.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a preparation method of nano zirconia-coated alumina powder. Background technique [0002] Alumina materials have high hardness, high wear resistance, corrosion resistance and other properties, and are widely used in minerals, metallurgy, chemicals, food, building materials and other industries. However, the disadvantages of high brittleness and poor toughness of alumina ceramics make their performance decline. Zirconia toughened alumina ceramics (referred to as composite ceramics ZTA), white in quality, corrosion resistant, and chemically stable. Toughening is achieved through the Martensitic phase transformation and microcracks of zirconia, and the two materials form an excellent composite with high strength and high toughness, which is more widely used. [0003] The preparation of ZTA ceramic powder is easy to operate by physical and mechanical mixing, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628
Inventor 王俊甫邓伟周雄罗甲业李强宋书明廖建中
Owner 江苏金石研磨有限公司
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