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Alumina ceramic and preparation method thereof

A technology of alumina ceramics and alumina, which is applied in the field of water-based injection molding alumina ceramics and its preparation, can solve problems such as the decrease in hardness and strength of alumina ceramics, achieve the elimination of intergranular pores, improve hardness and strength, and increase compactness effect

Active Publication Date: 2017-07-25
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the existing alumina ceramics to be solved by the present invention easily lead to the defects that the hardness and strength of alumina ceramics decrease while improving its toughness, and then provide a kind of aluminum oxide ceramics with high hardness and strength, good toughness, not easy to crack, and low porosity. Alumina ceramics and preparation method thereof

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  • Alumina ceramic and preparation method thereof
  • Alumina ceramic and preparation method thereof

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Embodiment 1

[0035] This embodiment provides an alumina ceramic, which is composed of the following raw materials in parts by weight:

[0036] 90g of alumina with a particle size of 40nm and a purity of 99.99%, 17g of aluminum hydroxide, 5.5g of magnesium oxide, 7.5g of silane coupling agent-KH550, 3.5g of binder-stearic acid, 6.5g Kaolin and 5g of magnesium aluminum spinel;

[0037] The preparation method of above-mentioned alumina ceramics, comprises the steps:

[0038] 1) Mix and grind aluminum oxide, aluminum hydroxide, magnesium oxide, kaolin, magnesium aluminum spinel and silane coupling agent in proportion until the particle size is not greater than 1 μm to obtain a mixture;

[0039] 2) Heat the binder to 140°C, then add the mixture into it and mix well;

[0040] 3) Injection molding the mixture processed in step 2) to obtain a molding, wherein the injection molding temperature is 155°C, the molding pressure is 3Mpa, and the molding time is 8s;

[0041] 4) Degumming the molded pr...

Embodiment 2

[0043] This embodiment provides an alumina ceramic, which is composed of the following raw materials in parts by weight:

[0044] 85g of alumina with a particle size of 20nm and a purity of 99.99%, 20g of aluminum hydroxide, 5g of magnesium oxide, 8g of silane coupling agent-KH550, 3g of binder-paraffin, 7g of kaolin and 4g of magnesium aluminum spinel;

[0045] The preparation method of above-mentioned alumina ceramics, comprises the steps:

[0046] 1) Mix and grind aluminum oxide, aluminum hydroxide, magnesium oxide, kaolin, magnesium aluminum spinel and silane coupling agent in proportion until the particle size is not greater than 1 μm to obtain a mixture;

[0047] 2) Heating the binder to 100°C, then adding the mixture and mixing;

[0048] 3) Injection molding the mixture processed in step 2) to obtain a molding, wherein the injection molding temperature is 150°C, the molding pressure is 4Mpa, and the molding time is 5s;

[0049] 4) Degumming the molded product at 600°...

Embodiment 3

[0051] This embodiment provides an alumina ceramic, which is composed of the following raw materials in parts by weight:

[0052] 95g of aluminum oxide with a particle size of 50nm and a purity of 99.99%, 15g of aluminum hydroxide, 6g of magnesium oxide, 7g of silane coupling agent-KH550, 4g of binder-polypropylene, 6g of kaolin and 6g of Magnesium aluminum spinel;

[0053] The preparation method of above-mentioned alumina ceramics, comprises the steps:

[0054] 1) Mix and grind aluminum oxide, aluminum hydroxide, magnesium oxide, kaolin, magnesium aluminum spinel and silane coupling agent in proportion until the particle size is not greater than 1 μm to obtain a mixture;

[0055] 2) Heat the binder to 180°C, then add the mixture and mix well;

[0056] 3) Injection molding the mixture processed in step 2) to obtain a molded product, wherein the injection molding temperature is 190°C, the molding pressure is 2Mpa, and the molding time is 10s;

[0057] 4) Degumming the molded p...

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Abstract

The invention discloses alumina ceramic and a preparation method thereof; in one aspect of the alumina ceramic, the surface of inorganic powder is coated with a binder through silane coupling agent, mobility and uniformity of the inorganic powder are enhanced, and the binder may break down and disperse from inside with the formation of zero or few holes and cracks during degumming; in second aspect, aluminum hydroxide, silane coupling agent and binder may break down and produce alumina and silica to fill possibly produced holes and cracks, and product compactness is enhanced; in third aspect, binding force between alumina and magnesia may increase under the induction of magnesium aluminate spinel; under the joint action of the three aspects, the alumina ceramic has increased hardness and strength. The growth of alumina grains is jointly inhibited under the cooperation of the magnesium aluminate spinel and magnesia at the premise of improving the hardness and strength of the alumina ceramic, inter-grain gaps are eliminated, the defects are lessened, stress concentration points are decreased, and the ductility of the alumina ceramic is improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, and in particular relates to an alumina ceramic and a preparation method thereof, in particular to a water-based injection molding alumina ceramic and a preparation method thereof. Background technique [0002] Alumina ceramics have the characteristics of high temperature resistance, wear resistance, electrical insulation, oxidation resistance, corrosion resistance and high mechanical strength. The above excellent physical and chemical properties make them widely used in many fields such as national defense, construction, chemical industry and smelting. As we all know, microscopically, alumina ceramic material is a material combined with covalent bonds and ionic bonds. Fracture occurs under the strain value, which greatly limits the wide application of alumina ceramics. [0003] In the face of the above problems, researchers have invented many toughening methods, among which the comm...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/626
CPCC04B35/10C04B35/62615C04B2235/3206C04B2235/3218C04B2235/3222C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3418C04B2235/349C04B2235/483C04B2235/96
Inventor 江毅
Owner JINGDEZHEN CERAMIC INSTITUTE
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