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Multiphase nitride combined silicon carbide ceramic foam filter and preparation method thereof

A technology of foam ceramics and silicon carbide, which is applied in the field of foam ceramic filtration and purification of molten metal, which can solve the problems of large-scale import of products and achieve good high temperature stability, good filtration and adsorption capacity, and high thermal shock stability.

Inactive Publication Date: 2010-05-19
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] It is used for high temperature resistant silicon carbide foam ceramic filters such as cast iron and continuous casting. At present, the production scale has not yet formed, and some are in the development stage, and the required products still need to be imported in large quantities.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the weight ratio of 19:65:11:5, fully mix silicon, silicon carbide, silicon dioxide and ball clay to make ceramic powder.

[0022] Mix ceramic powder, carboxymethyl cellulose, sodium humate, F10 and water according to the weight ratio of 100:0.5:0.2:0.3:60, and add it into a polyurethane ball mill tank with alumina as the grinding medium for ball milling for 3~ 5h, the ceramic slurry was prepared.

[0023] 10PPI soft polyurethane foam is selected and processed into a size of 60mm×60mm×20mm as the carrier of the ceramic slurry.

[0024] Immerse the carrier in the pre-prepared ceramic slurry. After the carrier absorbs the slurry, squeeze out the excess slurry, and then blow it with compressed air to remove the plugged pores on the surface to make a foam ceramic filter body.

[0025] Put the ceramic foam filter body into a drying oven, first keep it warm at 60°C for 4-6 hours, and then keep it at 100-120°C for 20-24 hours to dry and harden.

[0026] Put the ...

Embodiment 2

[0028] According to the weight ratio of 29:56:11:4, fully mix silicon, silicon carbide, silicon dioxide, and ball clay to make ceramic powder.

[0029] Mix ceramic powder, carboxymethyl cellulose, sodium humate, F10 and water according to the weight ratio of 100:0.3:0.15:0.4:55, and add it into a polyurethane ball mill tank with alumina as the grinding medium for ball milling for 3~ 5h, the ceramic slurry was prepared.

[0030] 10PPI soft polyurethane foam is selected and processed into a size of 60mm×60mm×20mm as the carrier of the ceramic slurry.

[0031]Immerse the carrier in the pre-prepared ceramic slurry. After the carrier absorbs the slurry, squeeze out the excess slurry, and then blow it with compressed air to remove the plugged pores on the surface to make a foam ceramic filter body.

[0032] Put the ceramic foam filter body into a drying oven, first keep it warm at 60°C for 4-6 hours, and then keep it at 100-120°C for 20-24 hours to dry and harden.

[0033] Put the...

Embodiment 3

[0035] According to the weight ratio of 36:56:5:3, fully mix silicon, silicon carbide, silicon dioxide, and ball clay to make ceramic powder.

[0036] Mix ceramic powder, carboxymethyl cellulose, sodium humate, F10 and water according to the weight ratio of 100:0.2:0.15:0.3:50, and add it into a polyurethane ball mill tank with alumina as the grinding medium for ball milling for 3~ 5h, the ceramic slurry was prepared.

[0037] 10PPI soft polyurethane foam is selected and processed into a size of 60mm×60mm×20mm as the carrier of the ceramic slurry.

[0038] Immerse the carrier in the pre-prepared ceramic slurry. After the carrier absorbs the slurry, squeeze out the excess slurry, and then blow it with compressed air to remove the plugged pores on the surface to make a foam ceramic filter body.

[0039] Put the ceramic foam filter body into a drying oven, first keep it warm at 60°C for 4-6 hours, and then keep it at 100-120°C for 20-24 hours to dry and harden.

[0040] Put the...

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PUM

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Abstract

The invention relates to a multiphase nitride combined silicon carbide ceramic foam filter and a preparation method thereof, and belongs to the technical field of refractory materials. The preparation method is realized in a way as follows: preparing slurry from silicon, silicon carbide, silicon dioxide, ball clay, admixtures and water; soaking the slurry by using soft polyurethane foam as the carrier to prepare a blank; and drying, and sintering at 1400-1500 DEG C in the nitrogen atmosphere to obtain the multiphase nitride combined silicon carbide ceramic foam filter. The ceramic foam filter of the invention has favorable high temperature stability in ferric and copper solutions, does not pollute alloys, has the open-cell rate of 80-90%, has favorable filtration and adsorption capacities on oxide inclusions and flux inclusions, and has the advantages of high filter capacity, favorable filtration and purifying effect, small hot melt and high thermal shock stability; the compression strength at normal temperature is not lower than 2.3 MPa; the ceramic foam filter can be cooled by water at 1100-20 DEG C for more than 23 times, and does not need preheating in use; and the highest service temperature is 1550 DEG C.

Description

technical field [0001] The invention relates to the purification of molten metals, in particular to foam ceramic filter technology, more specifically the invention relates to a multiphase nitride-bonded silicon carbide foam ceramic filter for cast iron and cast copper. Background technique [0002] The slag inclusions in the metal melting process and the pores generated in the casting process account for a large proportion of casting defects. In casting production, the casting rejection rate caused by non-metallic inclusions is generally as high as 50% to 60% of the total number of rejects, and the use of foam ceramic filters to filter molten metal can reduce 60% to 80% of slag and impurities. Scrap, meanwhile, the mechanical properties and machinability of filtered castings have been significantly improved. [0003] At present, in foreign countries, there are already some companies in developed countries engaged in the production of silicon carbide foam ceramic filters for...

Claims

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Application Information

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IPC IPC(8): B01D39/20C04B38/06C04B35/577
Inventor 曹会彦王建波杨洋李付龚剑锋李刚刘臻李龙飞
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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