Magnesium oxide-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 affecting the filtration effect, poor thermal shock stability of filter products, and enhanced strength, so as to improve the slurry hanging performance, Effects of improving thermal shock stability and strength, and increasing frame thickness

Active Publication Date: 2021-05-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the multi-porous structure of this product can increase the contact surface with inclusions, the holes left in the product skeleton after the polyurethane burns out make the product's strength need to be further enhanced to be suitable for the field of large-flux molten steel purification.
[0009] It can be seen that the magnesia porous ceramic filter prepared by using dense magnesia as raw material has a relatively dense skeleton surface, which will seriously affect the filtering effect of the filter on small-sized inclusions in molten metal, and because the dense magnesia has a large The expansion coefficient leads to poor thermal shock stability of filter products; although the filter prepared by fine powder containing micro-nano pores can improve the filtering effect on inclusions, the strength needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] Step 1, preparation of porous magnesium oxide particles

[0058] Step 1.1. Place the magnesite particles in a medium-temperature furnace, first raise the temperature to 650-800°C at a rate of 2-6°C / min, and keep it warm for 2.5-4.5h; then raise the temperature to 1150- 1350°C, keep warm for 2-7 hours, and cool to obtain porous magnesium oxide aggregates.

[0059] Step 1.2, according to the mass ratio of the porous magnesium oxide aggregate: aluminum sol is 100: (24 ~ 32), first place the porous magnesium oxide aggregate in a vacuum mixer, vacuumize to 2 ~ 3kPa, and then add The aluminum sol was stirred for 15-30 minutes, and the vacuum system was turned off to obtain a mixture.

[0060] Step 1.3: Dry the mixture at 110-120°C for 18-36 hours, then place it in a high-temperature furnace, heat up to 1650-1750°C at a rate of 3-5°C / min, keep it warm for 3-7 hours, and cool. Porous magnesium oxide particles are obtained.

[0061] Step 2, preparation of modified porous magn...

Embodiment 1

[0089] A magnesium oxide-silicon carbide-carbon porous ceramic filter and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0090] Step 1, preparation of porous magnesium oxide particles

[0091] Step 1.1. Put the magnesite particles in a medium-temperature furnace, first raise the temperature to 650°C at a rate of 2°C / min, and keep it warm for 2.5h; Magnesium oxide aggregates.

[0092] Step 1.2, according to the mass ratio of the porous magnesium oxide aggregate: aluminum sol is 100:24, first place the porous magnesium oxide aggregate in a vacuum mixer, evacuate to 2kPa, then add the aluminum sol, and stir After 15 minutes, the vacuum system was turned off to obtain the mixture.

[0093] Step 1.3. Dry the mixture at 110° C. for 18 hours, then place it in a high-temperature furnace, raise the temperature to 1650° C. at a rate of 3° C. / min, keep it warm for 3 hours, and cool to obtain porous magnesium oxide particles.

[0...

Embodiment 2

[0117] A magnesium oxide-silicon carbide-carbon porous ceramic filter and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0118] Step 1, preparation of porous magnesium oxide particles

[0119] Step 1.1. Place the magnesite particles in a medium-temperature furnace, first raise the temperature to 700°C at a rate of 3°C / min, and hold for 3 hours; then raise the temperature to 1200°C at a rate of 3°C / min, hold for 4 hours, and cool to obtain porous oxide Magnesium aggregates.

[0120] Step 1.2, according to the mass ratio of the porous magnesium oxide aggregate: aluminum sol is 100:26, first place the porous magnesium oxide aggregate in a vacuum mixer, vacuumize to 2.4kPa, then add the aluminum sol, Stir for 20 min, turn off the vacuum system to obtain a mixture.

[0121] Step 1.3: Dry the mixture at 115°C for 25 hours, then place it in a high-temperature furnace, raise the temperature to 1680°C at a rate of 4°C / min, keep ...

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Abstract

The invention relates to a magnesium oxide-silicon carbide-carbon porous ceramic filter and a preparation method thereof. The method comprises the following steps: taking modified porous magnesian fine powder, modified coke pitch powder, elemental silicon powder and sodium carboxymethylcellulose as raw materials, adding a water reducing agent, a defoaming agent, aluminum sol and deionized water, and stirring to obtain ceramic slurry with thixotropy; and immersing the silicon carbide preform into the ceramic slurry with thixotropy, taking out, carrying out centrifugal treatment, curing, drying, carrying out heat preservation in a carbon burying atmosphere at 1400-1600 DEG C for 2-6 hours, and cooling to obtain the magnesium oxide-silicon carbide-carbon porous ceramic filter. The filter has the characteristics of excellent filtering effect, high strength and good thermal shock resistance; and the filter is suitable for the field of molten steel purification, and is also suitable for the field of magnesium melt and magnesium alloy melt purification.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic filters. In particular, it relates to a magnesium oxide-silicon carbide-carbon porous ceramic filter and a preparation method thereof. Background technique [0002] The size of most of the inclusions in the molten metal (liquid steel, magnesium melt and magnesium alloy melt, etc.) is less than 50 μm. It is difficult for such small-sized inclusions to float up and be absorbed and removed by the top slag during the refining process, resulting in In addition, during the casting process, the content of inclusions in the molten metal is still high, which will not only cause blockage of the nozzle, but also seriously affect the quality of metal castings and endanger the performance of castings. Therefore, how to further reduce the number of inclusions in the molten steel and improve the quality of the metal has become an urgent problem to be solved. [0003] The purification technology of molte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/66C04B35/565C04B41/85B22D1/00B22C9/08
CPCC04B38/067C04B35/66C04B35/565C04B41/009C04B41/5096C04B41/85B22C9/086B22D1/007C04B2235/602C04B2235/606C04B2235/656C04B2235/6567C04B41/4535C04B41/5029C04B41/5001C04B41/5031Y02P10/20
Inventor 鄢文彭望定支瑾娜陈哲李光强郑万
Owner WUHAN UNIV OF SCI & TECH
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