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Preparation method for self-complement sub-micron crystal alumina ceramic

A crystalline alumina and submicron technology, which is applied in the field of preparation of self-reinforced submicron crystalline alumina ceramics, can solve the problems of inability to obtain submicron crystalline alumina ceramics, unsuitable for large-scale production, and high sintering temperature, and achieve Ease of large-scale industrial production, high toughness, and simple preparation process

Active Publication Date: 2009-01-14
SUZHOU CHUANGYUAN INVESTMENT DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it can be sintered at low temperature, the microstructure grains of the obtained alumina ceramics are not submicron, and it is necessary to add nanocrystalline alumina α-alumina prepared by wet chemical method, which is costly and not suitable for large-scale production
The Chinese invention patent with the application number 200710118742.4 relates to an alumina ceramic and its preparation method, but requires α-alumina raw materials with a purity of 99.9% or above, and the sintering temperature is high, and it is impossible to obtain submicron alumina ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] ① Take 30Kg of industrial grade boehmite containing 1.5% of the total mass fraction of silicon oxide, sodium oxide, calcium oxide, iron oxide and other impurities and fine-grained α-alumina with a total mass fraction of 10% of the total alumina into the ball mill Among them, the primary particle size of fine-grained α-alumina is 0.2 μm, the median particle size D50 is 0.8 μm, and the grinding medium uses zirconia or alumina balls with a diameter of 10 mm, and the mass ratio of material, balls, and water is 1 :1:1, ball milled for 24 hours to form a homogeneous mixture slurry.

[0023] ②Mix the above reaction mixture with 90kg of water at 85°C, add hydrochloric acid to control the pH value to 3, and form a partially peptized emulsion.

[0024] ③Add 150g single or mixed additives of zinc oxide, magnesium oxide, calcium oxide, yttrium oxide, lanthanum oxide, zirconium oxide, boron oxide, iron oxide, vanadium oxide, silicon oxide or titanium oxide to the above emulsion and ...

Embodiment 2

[0028] ①Take 100Kg of industrial grade aluminum hydroxide containing 0.8% of silicon oxide, sodium oxide, calcium oxide, iron oxide and other impurities in total mass fraction and fine-grained α-alumina accounting for 10% of total alumina mass fraction into In the ball mill, the primary particle size of fine-grained α-alumina is 0.2 μm, and the median diameter is 0.5 μm. The grinding medium uses zirconia or alumina balls with a diameter of 10 mm, and the mass ratio of material, balls, and water is 1: 1:1, ball milled for 48 hours to form a homogeneous mixture slurry.

[0029] ② Mix the above reaction mixture with 450kg of water at 80°C, add nitric acid to control the pH value to 2, and form a partially peptized emulsion.

[0030] ③Add a single or mixed additive of 550g of zinc oxide, magnesium oxide, calcium oxide, yttrium oxide, lanthanum oxide, zirconium oxide, boron oxide, iron oxide, vanadium oxide, silicon oxide or titanium oxide to the above emulsion to continue Mix and...

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Abstract

The invention relates to a preparation method of a low-cost self-reinforced submicron grain alumina ceramic, which belongs to the fine ceramic field. The method comprises the steps of: adopting industrial aluminum hydroxide or boehmite as a raw material, adding fine grain Alpha-alumina and water for ball milling so as to obtain an even slurry; adding water for mixing at a temperature between 70 and 90 DEG C, and adding acid to control the pH value at 2 to 5, so as to form an emulsion; and adding an additive which is a mixture selected from one or more than two of zinc oxide, magnesium oxide, calcium oxide, yttrium oxide, lanthanum oxide, zirconium oxide, boric oxide, ferric oxide, vanadium oxide, silicon oxide or titanium oxide for forming a gel after water is evaporated, and drying the gel and then sintering the gel under high temperature for preparing the self-reinforced submicron grain alumina ceramic containing alumina elongated grains. The ceramic is characterized in that crystal grains have diameters of less than 0.5mu m, and a microstructure contains elongated alumina grains have length-diameter ratios of larger than 5, and has the advantages of high hardness, high toughness and good wear resistance, and can be widely used in ceramic grinding media and the abrasives industry.

Description

technical field [0001] The invention relates to a preparation method of self-reinforcing submicron crystal alumina ceramics. More specifically, this patent relates to a method for preparing self-reinforced submicron alumina ceramics using low-cost industrial-grade aluminum hydroxide or boehmite as raw materials. It belongs to the field of alumina in inorganic non-metallic materials. Background technique [0002] Alumina ceramics are advanced ceramics with excellent properties such as high melting point, high hardness, high wear resistance, insulation, and heat resistance. They are widely used in aerospace, energy, biology, metallurgy, electronics, chemistry, and chemical industries. . In wear-resistant applications, alumina ceramic balls are used as grinding media and are an important engineering ceramic. Alumina ceramic balls are widely used in white cement, minerals and ceramics due to their high hardness, high density, wear resistance and corrosion resistance, good eco...

Claims

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Application Information

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IPC IPC(8): C04B35/111C04B35/622
Inventor 宋锡武蒋丹宇荀书斌胡增张涛徐兵黄德信徐海芳毛晗君
Owner SUZHOU CHUANGYUAN INVESTMENT DEV
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