Silicon carbide foam ceramic filter

A technology of foam ceramics and silicon carbide, which is applied in the field of foam ceramic filters and the filtration and purification of iron and metal melts. It can solve the problems of thermal and chemical instability of melts, low refractoriness and strength, and unstable performance. Filtration and adsorption capacity, good high temperature stability, good filtration and purification effect

Active 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...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] According to the weight ratio of 63.5:31.5:4:1, silicon carbide, aluminum oxide, silicon dioxide and talc are fully mixed to make ceramic powder.

[0051] Mix ceramic powder, carboxymethyl cellulose, polyvinyl alcohol, silica sol and water according to the weight ratio of 72:0.4:0.6:12:16, add to the mixer and stir for 2 to 3 hours to make the stirring evenly to make ceramic slurry .

[0052] Choose 10PPI soft polyurethane foam, process it into a size of 50mm×50mm×22mm, 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.

[0053] 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 squeezing and dipping, and squeeze out excess slurry to make a foam ceramic filter blank.

[0054] Put ...

Embodiment 2

[0057] According to the weight ratio of 61:3 3:5:1, fully mix silicon carbide, aluminum oxide, silicon dioxide and talc to make ceramic powder.

[0058] Mix ceramic powder, carboxymethyl cellulose, polyvinyl alcohol, silica sol and water according to the weight ratio of 75:0.3:0.8:15:20, add to the mixer and stir for 2 to 3 hours to make the stirring evenly to make a ceramic slurry .

[0059] Choose 10PPI soft polyurethane foam, process it into a size of 50mm×50mm×22mm, soak it in a 50°C alkali solution with a pH value of 8.5 for 30min 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.

[0060] 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 squeezing and dipping, and squeeze out excess slurry to make a foam ceramic filter blank.

[0061] Put the cer...

Embodiment 3

[0064] According to the weight ratio of 65:30:3:2, silicon carbide, aluminum oxide, silicon dioxide and talc are fully mixed to make ceramic powder.

[0065] Mix ceramic powder, carboxymethyl cellulose, polyvinyl alcohol, silica sol and water according to the weight ratio of 70:0.3:1:12:18, add to the mixer and stir for 2 to 3 hours to make the stirring evenly to make a ceramic slurry .

[0066] Choose 10PPI soft polyurethane foam, process it into a size of 50mm×50mm×22mm, soak it in a 50°C alkali solution with a pH value of 8.5 for 30min 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 machine for squeezing and dipping, and squeeze out excess slurry to make a foam ceramic filter blank.

[0068] Put the ...

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PUM

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Abstract

The present invention relates to a silicone carbide foamed ceramic filter. It is characterized by that said silicone carbide foamed ceramic filter is made up by adopting following steps: using silicone carbide, aluminium oxide, silicone dioxide and talcum to form ceramic powder, adding carboxyl methyl cellulose, polyvinyl alcohol, silica sol and water to prepare slurry, using soft polyurethane foam plastics as carrier, impregnating said carrier with above-mentioned slurry, extruding to obtain blank material, drying and sintering so as to obtain the invented silicone carbide foamed ceramic filter. The invention foamed ceramic filter has good high-temperature stability in the molten iron and copper solution, does not contaminate alloy and possesses good filtering and adsorption efficiency for removing oxide accompanying impurity and flux accompanying impurity from molten metal, 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 silicon carbide as a ceramic component, and the filter prepared by the present invention is used for filtering and purifying ferrous metal melts. 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] Fi...

Claims

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Application Information

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IPC IPC(8): B01D39/20C04B35/565C04B38/06B22D11/119
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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