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A kind of alumina-silicon carbide-carbon porous ceramic filter and preparation method thereof

A technology of porous ceramics and silicon carbide, which is applied in the direction of ceramic products, manufacturing tools, casting molding equipment, etc., can solve the problems of low service life, weak interaction behavior, and unstable volume, so as to improve strength and thermal shock stability, Good high-temperature structural stability and the effect of increasing the contact area

Active Publication Date: 2022-06-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, there are several problems in the existing porous ceramic filter technology for molten steel: first, the surface of the filter pore wall is dense, the interaction with non-metallic inclusions in molten steel is weak, and the removal effect of inclusions is poor, especially The removal effect on small-sized inclusions is weak; second, the filter skeleton has low strength, poor thermal shock stability, unstable volume and low service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053] Step 1. Preparation of Porous Alumina Ceramic Fine Powder

[0054] Step 1.1. Place the aluminum hydroxide fine powder in a high-temperature furnace, first heat up to 350-480°C at a rate of 2-3.5°C / min, keep the temperature for 2-3 hours, and then heat up to 890°C at a rate of 2-3.5°C / min ~1250°C, heat preservation for 2~4 hours, and cooling to obtain fine powder of porous alumina agglomerates.

[0055] Step 1.2, according to the mass ratio of the porous alumina agglomerate fine powder: the magnesium chloride solution is 100: (4~12), the porous alumina agglomerate fine powder is placed in a vacuum mixer, and vacuumed to 1~12 2kPa, then add the magnesium chloride solution, stir for 15-30min, close the vacuum system, and obtain mixture I.

[0056] Step 1.3: Keep the mixture I at 110-120°C for 1-3h, press-form at 100-180MPa, and dry the formed body at 110-120°C for 24-36h; then The dried green body is placed in a high-temperature furnace, heated to 1650-1750°C at a rate o...

Embodiment 1

[0084] An alumina-silicon carbide-carbon porous ceramic filter and a preparation method thereof. The preparation method described in this example:

[0085] Step 1. Preparation of Porous Alumina Ceramic Fine Powder

[0086] Step 1.1. Place the aluminum hydroxide fine powder in a high-temperature furnace, first heat up to 350°C at a rate of 2°C / min, hold for 2 hours, then heat up to 890°C at a rate of 2°C / min, hold for 2 hours, and cool to obtain Porous alumina agglomerate fine powder.

[0087] Step 1.2, according to the mass ratio of the porous alumina agglomerate fine powder: the magnesium chloride solution is 100:4, the porous alumina agglomerate fine powder is placed in a vacuum mixer, evacuated to 1kPa, and then the described The magnesium chloride solution was stirred for 15 min, and the vacuuming system was closed to obtain the mixture I.

[0088] Step 1.3, the mixture I was kept at 110°C for 1 hour, machine-pressed at 100MPa, and the formed body was dried at 110°C for...

Embodiment 2

[0113] An alumina-silicon carbide-carbon porous ceramic filter and a preparation method thereof. The preparation method described in this example:

[0114] Step 1. Preparation of Porous Alumina Ceramic Fine Powder

[0115] Step 1.1. Place the aluminum hydroxide fine powder in a high-temperature furnace, first heat up to 400°C at a rate of 2.5°C / min, hold for 2.5h, then heat up to 1000°C at a rate of 2.5°C / min, hold for 3h, cool, A fine powder of porous alumina agglomerates was obtained.

[0116] Step 1.2, according to the mass ratio of the porous alumina agglomerate powder: the magnesium chloride solution is 100:7, the porous alumina agglomerate fine powder is placed in a vacuum mixer, evacuated to 1.3kPa, and then added The magnesium chloride solution was stirred for 20 min, and the vacuuming system was closed to obtain Mixture I.

[0117] Step 1.3: Keep the mixture I at 115°C for 2h, press-form at 130MPa, and dry the formed body at 110°C for 28h; then place the dried body...

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PUM

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Abstract

The invention relates to an alumina-silicon carbide-carbon porous ceramic filter and a preparation method thereof. The technical scheme is: use 90-96wt% of modified porous alumina ceramic fine powder, 0.6-3wt% of elemental silicon powder and 3-7wt% of modified coal tar pitch powder as raw materials; 1.4wt% water reducing agent is stirred to obtain the mixture; then 0.5-3wt% rheology agent, 3-6wt% silica sol, 0.1-0.4wt% defoamer and 25-40wt% Stir with deionized water to obtain an aqueous solution; stir the aqueous solution and the mixture to obtain a slurry; then completely immerse the silicon carbide preform into the slurry, centrifuge, dry, and keep warm at 1350-1450°C in an atmosphere of buried carbon. After cooling, an alumina-silicon carbide-carbon porous ceramic filter is obtained. The product produced by the invention has strong mechanical properties, good thermal shock stability, long service life and excellent purification effect of molten steel.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic filters. In particular, it relates to an alumina-silicon carbide-carbon porous ceramic filter and a preparation method thereof. Background technique [0002] Non-metallic inclusions in molten steel are one of the main factors affecting the quality of steel. The sources of non-metallic inclusions mainly include inclusions (such as oxide and sulfide inclusions) generated during the steelmaking process and external inclusions (refractory materials). debris, mold residue, etc.). The introduction of a ceramic filter with a three-dimensional network skeleton structure and through-hole pores in the final stage of molten steel casting has a decisive impact on the purity of the final finished steel and is one of the important ways to remove non-metallic inclusions in molten steel. [0003] At present, the research on the preparation of porous ceramic filter materials has progressed. [0004] "A p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/80C04B35/10C04B35/622B22C9/08
CPCY02P10/20
Inventor 鄢文支瑾娜陈哲鄢俊杰梁雄李亚伟李远兵
Owner WUHAN UNIV OF SCI & TECH