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Magnesium oxide foam ceramic filter

A foamed ceramic and magnesium oxide technology, which is applied in the fields of filtration and separation, ceramic products, chemical instruments and methods, can solve the problems of unstable filtration effect, reduced mechanical properties of castings, and oxide inclusions in oxide scales, and achieves good filtration and adsorption capacity. , Good filtration and purification effect, good high temperature stability effect

Inactive Publication Date: 2009-09-09
晋城市富基新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, all these filters can only filter out large inclusions and very few small inclusions in molten metal through mechanical sieving
Due to the low refractoriness and strength of the aluminum silicate fiber filter, it can only be used for filtering non-ferrous alloys, cast iron and small steel castings, and it is difficult to withstand the impact of high-temperature metal fluid for a long time; the molybdenum wire and Although the boron nitride fibrous filter screen developed in the United States can be used to filter high-temperature alloys such as cast steel, its application is limited because of its high price.
There are also straight-hole core-type ceramic filters and refractory particle filters used for casting alloy filtration, but their porosity is small, and the filtration efficiency of the former is still low, and the filtration effect is unstable. Bonding effect makes it easy to leak particles and inconvenient to use
Although the sintered porous ceramic filter first successfully developed in the United States in the early 1970s solved the problems of easy particle leakage and inconvenient use of the refractory particle filter, it is different from the honeycomb straight-hole ceramic filter successfully developed in the early 1980s in the United States. Like the container, the porosity is still small, generally less than 50%, so that the flow rate of the molten metal is low
Magnesium and magnesium alloy liquid are easy to oxidize and burn, and the scale is easy to cause oxide inclusions
[0009] For a long time, the defects of oxide inclusions and flux inclusions in magnesium alloy casting production have been a relatively prominent problem. The existence of inclusion defects significantly reduces the mechanical properties of castings, and also reduces the integrity and smoothness of casting surfaces, greatly reducing the surface quality of castings. Corrosion resistance
However, because magnesium oxide is not easy to sinter, pure magnesium oxide cannot have all the desired functions, so it is difficult to manufacture qualified magnesium oxide foam ceramic filters suitable for magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Calcinate the magnesium oxide at 1480°C for 1.5h, then pulverize it with a ball mill, and screen the 30-35μm fine powder for later use.

[0056] According to the weight ratio of 96.5:2.5:1, magnesium oxide, boron carbide and diboron trioxide are fully mixed to make ceramic powder.

[0057] Mix the ceramic powder, methyl cellulose and water according to the weight ratio of 70:1.6:35, put into the mixer and stir for 2-3 hours, make the stirring evenly, and make the ceramic slurry.

[0058] Choose 10PPI soft polyurethane foam, process it into a size of 100mm×100mm×20mm, soak it in a 60°C alkali solution with a pH value of 7.5 for 20min to remove the film in the foam hole, and then rinse with water to remove the alkali solution, and then naturally dried to remove moisture, as a carrier for ceramic slurry.

[0059] Using the roll pressing and dipping process, add ceramic slurry to the foam plastic carrier, and then input the carrier into the slurry dipping machine for squee...

Embodiment 2

[0063] Calcinate the magnesium oxide at 1450°C for 2 hours, then pulverize it with a ball mill, and screen the fine powder of 30-35 μm for later use.

[0064] According to the weight ratio of 97.5:1.5:1, magnesium oxide, boron carbide and diboron trioxide are fully mixed to make ceramic powder.

[0065] Mix the ceramic powder, methyl cellulose and water according to the weight ratio of 70:1.8:35, put into the mixer and stir for 2-3 hours, make the stirring evenly, and make the ceramic slurry.

[0066] Choose 10PPI soft polyurethane foam, process it into a size of 100mm×100mm×20mm, soak it in a 50°C alkali solution with a pH value of 8.5 for 30 minutes to remove the film in the foam hole, and then rinse with water to remove the alkali solution, and then naturally dried to remove moisture, as a carrier for ceramic slurry.

[0067] Using the roll pressing and dipping process, add ceramic slurry to the foam plastic carrier, and then input the carrier into the slurry dipping machi...

Embodiment 3

[0071] Calcinate the magnesium oxide at 1500°C for 1 hour, then pulverize it with a ball mill, and screen the fine powder of 35-40 μm for later use.

[0072] According to the weight ratio of 96.5:2:1.5, magnesium oxide, boron carbide and diboron trioxide are fully mixed to make ceramic powder.

[0073] Mix ceramic powder, methyl cellulose and water according to the weight ratio of 68:2.2:32, put into a mixer and stir for 2-3 hours to make the stirring evenly, and make a ceramic slurry.

[0074] Choose 10PPI soft polyurethane foam, process it into a size of 100mm×100mm×20mm, soak it in a 60°C alkali solution with a pH value of 8.5 for 30 minutes to remove the film in the foam plastic hole, and then rinse with water to remove the alkali solution, and then naturally dried to remove moisture, as a carrier for ceramic slurry.

[0075] Using the roll pressing and dipping process, add ceramic slurry to the foam plastic carrier, and then input the carrier into the slurry dipping mach...

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Abstract

The invention relates to a magnesia foam ceramic filter with special high-temperature chemical stability, which is composed of magnesia, boron The high-quality polyurethane foam is used as the carrier, impregnated with the above slurry, extruded to form a billet, dried and sintered to obtain a magnesia foam ceramic filter. The ceramic foam filter of the present invention has good high-temperature stability in the magnesium alloy melt, does not pollute the alloy, has good filtration and adsorption capacity for oxidation inclusions and flux inclusions in the magnesium alloy melt, and has a good filtration and purification effect and is heat-resistant. Small capacity, no need to preheat when using, small fluid resistance, large filtration capacity, through the filtration and purification test of metal magnesium and magnesium alloy melt, all performances are good.

Description

technical field [0001] The invention relates to the purification of molten metal, in particular to a foam ceramic filter. More specifically, the present invention relates to a ceramic foam filter containing magnesia as a ceramic component, and the filter prepared by the present invention is used for filtering and purifying magnesium alloy melt. Background technique [0002] During the smelting and pouring process of various metal liquid alloys, the casting reject rate caused by casting defects such as non-metallic inclusions and shrinkage holes is generally as high as 50-60% of the total rejects. Inclusion defects not only seriously reduce the mechanical properties and casting properties of castings, but also have harmful effects on the machining and appearance of castings. Purifying liquid casting alloys, reducing or eliminating various non-metallic inclusions and exhaust gases are undoubtedly important technical measures to obtain high-quality castings. [0003] Filtrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20C04B35/04C04B38/06B22D11/119
Inventor 李军虎关晋军逯文强刘志刚田建刚秦胜利
Owner 晋城市富基新材料股份有限公司
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