Alumina ceramic material and preparation method thereof

A technology for alumina ceramics and raw materials, applied in the field of preparation of alumina ceramic materials, can solve the problems of high sintering temperature, high energy consumption, high material cost, etc., and achieve the effects of low sintering temperature, less dosage and low cost

Active Publication Date: 2015-03-04
江苏龙欧新型建材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN103435335A discloses a preparation method of alumina ceramic material. In this method, alumina powder, kaolin, light calcium carbonate, magnesium carbonate, water, dispersant and binder are ball-milled, dried and ground to obtain powder, powder After sieving and removing iron, add a release agent and mix evenly, then press into a green body, and the green body is sintered at high temperature to obtain alumina ceramic materials. In this method, the sintering temperature is high, the energy consumption is large, and the material cost is expensive.

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  • Alumina ceramic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0061] Pre-desilication reaction: put high-aluminum fly ash in 20% sodium hydroxide solution, the liquid-solid ratio is 3:1, heat up to 100°C, and stir at 450r / min for 5h to react.

[0062] Acid activation reaction: filter the fly ash after the pre-desiliconization reaction, wash it with water, put it in 10% hydrochloric acid solution, the liquid-solid ratio is 3:1, raise the temperature to 95°C, stir at 750r / min for 0.5h to react and then filter ,dry.

[0063] Weigh 9446kg of pretreated fly ash, 157kg of light calcium carbonate, 397kg of magnesium carbonate, and 3kg of ISOBAM-110 respectively, place them in a polyurethane ball mill tank, add 7780kg of deionized water as the dispersion medium, and ball mill for 38 hours; then add 3kg of ISOBAM-104 , ball milled again for 7 hours to obtain the slurry; when the particle size of the slurry reaches D50 of 1.31 μm and D90 of 1.87 μm, it is dried at a temperature of 75°C for 20 hours and ground for 1 hour, and then passed through a ...

Embodiment 2

[0067] Pre-desilication reaction: put high-alumina fly ash in 15% sodium hydroxide solution, the liquid-solid ratio is 0.5:1, heat up to 120°C, and stir at 750r / min for 5h to react.

[0068] Acid activation reaction: filter the fly ash after the pre-desiliconization reaction, wash it with water, put it in 5% hydrochloric acid solution, the liquid-solid ratio is 1:1, raise the temperature to 60°C, stir at 750r / min for 2h to react, then filter, dry.

[0069] Weigh 9745kg of pretreated fly ash, 13kg of light calcium carbonate, 242kg of magnesium carbonate, and 2kg of ISOBAM-110 respectively, place them in a polyurethane ball mill tank, add 8000kg of deionized water as the dispersion medium, and ball mill for 40 hours; then add 2kg of ISOBAM-104 , ball milled again for 8 hours to obtain the slurry; when the particle size of the slurry reached D50 to 1.45 μm and D90 to 2.14 μm, it was dried at 80°C for 24 hours and ground for 2 hours, then passed through a 200-mesh sieve to remove ...

Embodiment 3

[0073] Pre-desilication reaction: put high-alumina fly ash in 17% potassium hydroxide solution, the liquid-solid ratio is 2:1, heat up to 90°C, and stir at 650r / min for 2h to react.

[0074] Acid activation reaction: filter the fly ash after the pre-desiliconization reaction, wash it with water, put it in 20% hydrochloric acid solution, the liquid-solid ratio is 2:1, raise the temperature to 75°C, stir at 650r / min for 2h to react, then filter, dry.

[0075] Weigh 9665kg of pretreated fly ash, 90kg of light calcium carbonate, 324kg of magnesium carbonate, and 1kg of ISOBAM-110 respectively, place them in a polyurethane ball mill tank, add 8180kg of deionized water as the dispersion medium, and ball mill for 42 hours; then add 1kg of ISOBAM-104 , ball milled again for 9 hours to obtain the slurry; when the particle size of the slurry reached D50 to 1.42 μm and D90 to 2.03 μm, it was dried at 85°C for 28 hours and ground for 1.5 hours, then passed through a 200-mesh sieve to remo...

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Abstract

The invention provides an alumina ceramic material which uses high-alumina fly ash, light calcium carbonate and magnesium carbonate as raw materials. The preparation method comprises the following steps: firstly, performing pre-desilicification and acid activation pretreatment on the high-alumina fly ash to improve the alumina content in the high-alumina fly ash; then, ball-milling the high-alumina fly ash, the light calcium carbonate, the magnesium carbonate, water, a dispersing agent and a binding agent, drying, and grinding, so as to obtain powder; sieving and deironing the powder, adding a release agent, uniformly mixing, then pressing into a green body, and performing pressurization high-temperature sintering on the green body, so as to obtain the alumina ceramic material. According to the method, no other additional aluminium sources are needed, and the sintering temperature is obviously reduced during the preparation process, so that the cost is reduced; moreover, the method is high in parameter controllability and high in repeatability, and the prepared products are good in consistency, high in abrasion resistance and high in stability.

Description

technical field [0001] The invention relates to a method for preparing an alumina ceramic material, belonging to the field of ceramic material preparation. Background technique [0002] 95 porcelain has comprehensive excellent properties such as high mechanical strength, high hardness, small high-frequency dielectric loss, high high-temperature insulation resistance, good chemical corrosion resistance and thermal shock resistance; in addition, its price is lower than that of zirconia and zirconium toughened oxidation Aluminum is cheap, so it has been widely used, and its sales also occupy the first place among fine ceramics. There are hundreds of domestic manufacturers. However, since the sintering temperature of 95 porcelain is as high as 1650-1700 ° C, the investment in kiln and kiln furniture is large, and the energy consumption is high. Especially in the current situation of tight supply of coal, oil and electricity, the production cost will be significantly increased an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 华文蔚
Owner 江苏龙欧新型建材科技有限公司
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