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Low-temperature quick sintered high-strength aluminum oxide ceramic and preparation method thereof

An alumina ceramic and rapid technology, which is applied in the field of low-temperature rapid sintering of high-strength alumina ceramics and its preparation, can solve the problems of poor mechanical properties, high cost, unsuitable for industrial scale production, etc. The effect of solving abnormal grain growth and inhibiting abnormal grain growth

Inactive Publication Date: 2011-08-10
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the normal pressure sintering method has high firing temperature, long cycle, large energy consumption, low material density, and poor mechanical properties; although other firing methods can overcome the defects of normal pressure sintered alumina ceramics, they are expensive and energy-intensive. High consumption, not suitable for industrial scale production

Method used

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  • Low-temperature quick sintered high-strength aluminum oxide ceramic and preparation method thereof
  • Low-temperature quick sintered high-strength aluminum oxide ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] No nano-Al is added in this embodiment 2 o 3 powder to prepare alumina ceramics for comparison.

[0026] In this embodiment, the raw materials of high-strength alumina ceramics fired rapidly at low temperature are composed of:

[0027] Coarse crystalline Al 2 o 3 Powder 100g;

[0028] Sintering aid: SiO 2 Powder 1.6g, talcum powder 2g, limestone powder 0.4g;

[0029] Of which coarse-grained Al 2 o 3 Powder median diameter D 50 Particle size is 0.6-1.0μm, nano Al 2 o 3 The particle size of the powder is 10-30nm.

[0030] In this embodiment, low-temperature rapid firing high-strength alumina ceramics are prepared according to the following steps:

[0031] a. Abrasive

[0032] Coarse crystalline Al 2 o 3 Powder, SiO 2 Powder, talc powder and limestone powder are mixed to obtain a mixture, and the mixture is put into a planetary ball mill, using a polytetrafluoroethylene ball mill jar, the grinding medium is zirconia balls, and absolute ethanol is used as a ...

Embodiment 2

[0039] In this embodiment, the raw materials of high-strength alumina ceramics fired rapidly at low temperature are composed of:

[0040] Coarse crystalline Al 2 o 3 Powder 60g; Nano Al 2 o 3 Powder 40g;

[0041] Sintering aid: SiO 2 Powder 1.35g, talcum powder 1.35g, limestone powder 0.3g;

[0042] Of which coarse-grained Al 2 o 3 Powder median diameter D 50 Particle size is 0.6-1.0μm, nano Al 2 o 3 The particle size of the powder is 10-30nm.

[0043] In this embodiment, low-temperature rapid firing high-strength alumina ceramics are prepared according to the following steps:

[0044] a. Abrasive

[0045] Coarse crystalline Al 2 o 3 powder, nano Al 2 o 3 Powder, SiO 2 Powder, talc and limestone powder are mixed to obtain a mixture, and the mixture is put into a planetary ball mill, using a polytetrafluoroethylene ball mill jar, the grinding medium is zirconia balls, and absolute ethanol is used as a solvent, wet ball milled for 5 hours, and the ball mill is o...

Embodiment 3

[0052] In this embodiment, the raw materials of high-strength alumina ceramics fired rapidly at low temperature are composed of:

[0053] Coarse crystalline Al 2 o 3 Powder 70g; Nano Al 2 o 3 Powder 30g;

[0054] Sintering aid: SiO 2 powder 2.4g, talcum powder 3g, limestone powder 0.6g;

[0055] Of which coarse-grained Al 2 o 3 Powder median diameter D 50 Particle size is 0.6-1.0μm, nano Al 2 o 3 The particle size of the powder is 10-30nm.

[0056] In this embodiment, low-temperature rapid firing high-strength alumina ceramics are prepared according to the following steps:

[0057] a. Abrasive

[0058] Coarse crystalline Al 2 o 3 powder, nano Al 2 o 3 Powder, SiO 2 Powder, talc and limestone powder are mixed to obtain a mixture, and the mixture is put into a planetary ball mill, using a polytetrafluoroethylene ball mill jar, the grinding medium is zirconia balls, and absolute ethanol is used as a solvent, wet ball milled for 8 hours, and the ball mill is obtai...

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Abstract

The invention discloses low-temperature quick sintered high-strength aluminum oxide ceramic and a preparation method thereof. The low-temperature quick sintered high-strength aluminum oxide ceramic consists of coarse crystal Al2O3 powder, nano Al2O3 powder and a sintering auxiliary agent serving as raw materials, wherein the sintering auxiliary agent consists of SiO2 powder, talc powder and limestone powder. The preparation method comprises the following steps of: partially replacing coarse crystal aluminum oxide by using the nano aluminum oxide powder, mixing, dispersing, pre-pressing and molding, performing 200 to 300MPa cold isostatic pressing molding, performing dumping on a molded test sample in a muffle furnace at a temperature of between 400 and 600 DEG C for 30 to 60 minutes, and finally performing low-temperature quick sintering by adopting a microwave sintering method to obtain the high-strength aluminum oxide ceramic. Quick sintering of the aluminum oxide ceramic can be realized at a lower temperature in short time by partially replacing the coarse crystal aluminum oxide powder by using the nano aluminum oxide powder and combining a microwave sintering process, and therefore, the energy consumption is low, and the cost is saved.

Description

1. Technical field [0001] The invention relates to an alumina ceramic and a preparation method thereof, in particular to a low-temperature rapid firing high-strength alumina ceramic and a preparation method thereof. 2. Background technology [0002] Alumina ceramics are an important class of high-temperature structural ceramics with high mechanical strength, high hardness, corrosion resistance, wear resistance, and high resistivity. They are widely used in electronics, chemicals, machinery and other fields. However, the brittleness of alumina ceramics largely limits its application range. At the same time, the high sintering temperature of alumina ceramics can easily lead to abnormal growth of grains and affect the mechanical properties of materials. The emergence of nano-ceramics in recent years has brought new hope for the solution of the above problems. Nano-nanometerization and nano-composite of alumina ceramics are currently one of the ways to improve their mechanical ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/64
Inventor 刘银闵凡飞
Owner ANHUI UNIV OF SCI & TECH
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