Magnesium aluminate spinel foamed ceramic filter as well as preparation method thereof

A technology of magnesia-aluminum spinel and magnesia-aluminum spinel powder is applied in the fields of filtration, purification, and steady flow of molten metal, and achieves the effects of low sintering temperature, good use effect and easy process control.

Active Publication Date: 2014-02-05
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Magnesium and magnesium alloy melts have extremely high requirements for ceramic foam filters. Magnesium alloy casting cannot use general ceramic foam filters because the standard of magnesium oxide The free enthalpy of formation is low, and molten magnesium can react with some oxides with high standard free enthalpy at high temperatures, thereby corroding the foam ceramic skeleton and polluting the alloy
Therefore, the general aluminum-silicon series and silicon carbide foamed ceramics will be quickly destroyed by erosion in the molten magnesium solution, and cannot be used for the filtration of magnesium alloys.
At present, zirconia foam ceramic filter can meet this requirement, but its price is extremely high, which is equivalent to about 10-15 times the price of general aluminum-silicon foam ceramic filter; magnesium oxide filter is also magnesium and magnesium alloy An optional material for melt filtration, which has the advantages of cleanliness and corrosion resistance, but the magnesium oxide powder will undergo hydrolysis reaction in the water-based system, which makes it difficult to control the performance of the magnesium oxide slurry, and its sintering temperature is very high. The sintering accelerator will pollute the magnesium melt and the price is high, which makes the mass production of magnesia foam ceramics difficult and the manufacturing cost is high. In addition, zirconia and magnesia foam ceramics are due to their production Due to the characteristics of the process or material itself, the size of the product is also limited accordingly, and it is impossible to produce large-sized ceramic filter plates. Therefore, it is of great significance to develop a new material foam ceramic filter that is suitable for magnesium alloy filtration and is easy for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh the ceramic powder according to the following mass:

[0039] Magnesium aluminum spinel fine powder: alumina fine powder: magnesium hydroxide powder = 1000g: 0g: 0g

[0040] Based on the ceramic powder, prepare a mixed solution in a container with the following quality: 30 g of water-soluble polyurethane resin; 150 g of water; 3 g of sodium polyacrylate: while stirring the solution, add the above ceramic powder to prepare a homogeneous slurry.

[0041] 20PPI polyurethane sponge is selected, processed into a Φ80mm×20mm disc after hydrophilic treatment, and used as the carrier of the ceramic slurry.

[0042] The polyurethane sponge disc is immersed in the slurry, fully wetted, and the excess slurry is squeezed out by a rolling process to make a ceramic foam filter blank. Put the biscuit into the drying equipment, and control the temperature of 60°C×5h, 110°C×5h for drying treatment.

[0043] Finally, put the ceramic foam filter blank into the firing equipment, rais...

Embodiment 2

[0045] Weigh the ceramic powder according to the following mass: magnesium aluminum spinel fine powder: alumina fine powder: magnesium hydroxide powder = 400g: 340g: 260g

[0046] Taking the ceramic powder as a benchmark, prepare a mixed solution with the following quality in a container: 70g of water-soluble epoxy resin; 250g of water; 5g of ammonium polyacrylate. While stirring the solution, add the ceramic powder to prepare a homogeneous slurry.

[0047] 20PPI polyurethane sponge is selected, processed into a Φ80mm×20mm disc after hydrophilic treatment, and used as the carrier of the ceramic slurry.

[0048] The polyurethane sponge disc is immersed in the slurry, fully wetted, and the excess slurry is squeezed out by a rolling process to make a ceramic foam filter blank. Put the biscuit into the drying equipment, and control the temperature of 60°C×5h, 110°C×5h for drying treatment.

[0049] Finally, put the ceramic foam filter blank into the firing equipment, raise the t...

Embodiment 3

[0051] Magnesium aluminum spinel fine powder: alumina micropowder: magnesium hydroxide powder = 600g: 340g: 60g

[0052] Based on the ceramic powder, prepare a mixed solution in a container with the following quality: 50 g of water-soluble acrylic resin, 180 g of water, 3.5 g of sodium tripolyphosphate, and 1 g of boron carbide; while stirring the solution, add the above-mentioned ceramic powder to prepare a uniform solution. raw material slurry.

[0053] 20PPI polyurethane sponge is selected, processed into a Φ80mm×20mm disc after hydrophilic treatment, and used as the carrier of the ceramic slurry.

[0054] The polyurethane sponge disc is immersed in the slurry, fully wetted, and the excess slurry is squeezed out by a rolling process to make a ceramic foam filter blank. Put the biscuit into the drying equipment, and control the temperature of 60°C×5h, 110°C×5h for drying treatment.

[0055] Finally, put the ceramic foam filter blank into the firing equipment, heat up at 1°...

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Abstract

The invention relates to a magnesium aluminate spinel foamed ceramic filter which is excellent in high-temperature chemical stability and thermal shock resistance. A preparation method of the magnesium aluminate spinel foamed ceramic filter comprises the following steps: firstly, using water-base resin, a dispersing agent and water as a solvent, forming ceramic powder by using magnesium aluminate spinel powder, aluminum oxide powder and magnesium hydroxide powder, and mechanically stirring to prepare slurry; soaking polyurethane porous sponge serving as a carrier in slurry, pressing to remove excessive slurry to prepare a preform body, drying and sintering to obtain the magnesium aluminate spinel foamed ceramic filter. The foamed ceramic filter disclosed by the invention can satisfy rigorous requirements of filtering of molten magnesium alloy, has good high-temperature stability, does not pollute the alloy, has good filtering and adsorbing effect on inorganic impurities in the molten magnesium alloy, and is good in filtering and purifying effect, small in fluid resistance, and large in filtration yield; and good using effect is obtained through trial in casting production of metal magnesium and magnesium alloy.

Description

Technical field: [0001] The invention relates to the steady flow, filtration and purification of molten metal, in particular to a magnesia-alumina spinel foam ceramic filter and a preparation method thereof, which are applied in metal smelting and casting industries. The filter prepared by the invention is mainly used for Melting and filtering of metal magnesium and magnesium alloys. technical background: [0002] During the smelting and pouring process of molten steel, molten iron and various non-ferrous metals, defects such as inorganic inclusions and shrinkage pores are the main reasons for the scrapping of castings. Inclusion defects not only affect the appearance of the product but also seriously reduce the mechanical properties and service life of the product. Therefore, reducing inorganic inclusions and pore defects is the key to producing high-quality castings. [0003] Ceramic foam filter can reduce or eliminate casting defects and improve alloy yield and process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B38/06
Inventor 王冬冬王自强王刚周惠君
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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