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Magnesium oxide foam ceramic filter

A technology of foam ceramics and magnesium oxide, which is applied in the filtration and purification of magnesium alloy melts, and in the field of foam ceramic filters, can solve problems such as unstable filtration effects, reduced mechanical properties of castings, oxide skin and oxidized inclusions, etc., to achieve good filtration and Adsorption capacity, good filtration and purification effect, good high temperature stability effect

Inactive Publication Date: 2008-04-23
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

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 present invention relates to an aluminium oxide foamed ceramic filter with special high-temperature chemical stability. Said aluminium oxide foamed ceramic filter is made up by adopting the following steps: using magnesium oxide, boron carbide and boron trioxide to form ceramic powder, then adding methyl cellulose and water to prepare slurry, using soft polyurethane foamed plastics as carrier, impregnating said carrier with said slurry, extruding to make blank material, drying and sintering so as to obtain the invented magnesium oxide foamed ceramic filter. The invented foamed ceramic filter has good high-temperature stability in the molten magnesium alloy, does not contaminate alloy and possesses good filtering and adsorption efficiency for removing oxide impurity and flux impurity form molten magnesium alloy, so that its filtering purification effect is 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 Applications(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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