Self-repairing aluminum oxide-based ceramic composite material and preparation thereof

A technology of composite materials and alumina, which is applied in the field of self-healing alumina-based ceramic composite materials and its preparation, can solve the problems of less research on the self-healing process of high-temperature surface cracks, so as to overcome brittleness and reduce product scrap rate , Enhance the effect of ceramic materials

Inactive Publication Date: 2009-04-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the 1980s Al 2 o 3 The research on -SiC composite materials has received great attention. The research focuses on the mechanical behavior, chemical stability and thermal shock resistance, but there are few studies on the self-healing process of high-temperature surface cracks. At present, the research on the crack healing of ceramic materials is mainly focus on Japan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Preparation of composite ceramics

[0019] Weigh 5g of silicon carbide whiskers, 1g of zirconia, 2g of aluminum powder, 1g of magnesia, 90.5g of aluminum oxide, and 0.5g of methyl cellulose mixed ball mill, molding, the composite ceramic precursor Raise the temperature at 6°C / min to 800°C, keep it warm for half an hour, then heat it up to 1600°C at a heating rate of 3°C / min, and keep it warm for 3 hours. The strength of the sample increased from 236MPa when cracks occurred to 374MPa, and the strength increased by 58%.

[0020] 2) Crack self-healing

[0021] The pressure surface of the sintered sample was polished to a mirror surface, and cracks were introduced by a Vickers hardness tester. The prefabricated cracked samples were heated to 1000°C for 2 hours, and then cooled slowly in the furnace. After self-healing treatment, the strength of the sample increased from 236MPa when cracks occurred to 364MPa, and the strength increased by 54%.

Embodiment 2

[0023] 1) Preparation of composite ceramics

[0024] Weigh 10g of silicon carbide whiskers, 1g of zirconia, 2g of aluminum powder, 1g of magnesia, 85g of aluminum oxide, and 1g of methyl cellulose mixed ball mill, molded, the composite ceramic precursor at 5 ℃ / min to 800°C, hold for half an hour, then heat to 1600°C at a heating rate of 2°C / min, and hold for 2 hours.

[0025] 2) Crack self-healing

[0026] The pressure surface of the sintered sample was polished to a mirror surface, and cracks were introduced by a Vickers hardness tester. The prefabricated cracked samples were heated to 1000°C for 1 hour, and then cooled slowly in the furnace. After self-healing treatment, the strength of the sample increased from 245MPa when cracks occurred to 398MPa, and the strength increased by 62%.

Embodiment 3

[0028] 1) Preparation of composite ceramics

[0029] Weigh 20g of silicon carbide whiskers, 2g of zirconia, 5g of aluminum powder, 2g of magnesia, 68g of aluminum oxide, and 3g of methyl cellulose mixed ball mill, molded the composite ceramic precursor at 3 ℃ / Raise the temperature to 800°C in one minute, keep it warm for half an hour, then heat it up to 1500°C at a heating rate of 4°C / min, and keep it warm for 3 hours.

[0030] 2) Crack self-healing

[0031] The pressure surface of the sintered sample was polished to a mirror surface, and cracks were introduced by a Vickers hardness tester. The prefabricated cracked samples were heated to 800°C for 2 hours, and then cooled slowly in the furnace. After self-healing treatment, the strength of the sample increased from 258MPa when cracks occurred to 430MPa, and the strength increased by 66%.

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Abstract

The invention relates to a self-healing alumina-based ceramic composite material and a preparation method thereof. The material is characterized in that the compositions thereof comprise 5-20 percent of carborundum or titanium carbide, 1.0-2.0 percent of zirconia, 1.0-2.0 percent of magnesia, 2.0-5.0 percent of aluminum powder, 0.5-3 percent of methylcellulose and rest of powdered alumina by weight percent; the self-healing treatment conditions of the crackles are heat insulation for 1-3h at 800-1200 DEG C. The self-healing alumina-based ceramic composite material of the invention can effectively overcome the inherent brittleness of the ceramic material; the addition of silicon carbide whiskers not only plays the role of strengthening the ceramic material, but more importantly, the silicon carbide fills the crackles through a series of reactions in the self-healing process of the ceramic crackles. The self-healing alumina-based ceramic composite material has the advantages of improving the quality of ceramic products, reducing the reject rate of the products and playing a significant role in reducing cost and enhancing the efficiency for the enterprise.

Description

technical field [0001] The invention relates to a self-healing alumina-based ceramic composite material and a preparation method thereof. Background technique [0002] Ceramic materials have many excellent properties, such as high temperature resistance, corrosion resistance, friction loss resistance and so on. Its functional materials have unique electrical properties, magnetic properties, ferroelectric properties, etc. But a common defect of ceramic materials is its brittleness. Silicon carbide has become one of the best choices for reducing the brittleness and toughening and reinforcing phase of alumina ceramics due to its excellent mechanical and oxidation resistance properties. From the 1980s Al 2 o 3 The research on -SiC composite materials has received great attention. The research focuses on the mechanical behavior, chemical stability and thermal shock resistance, but there are few studies on the self-healing process of high-temperature surface cracks. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10
Inventor 韩冬张树朝李晋峰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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