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Filter for filtering molten metals and manufacturing method thereof

A molten metal and filter technology, applied in chemical instruments and methods, filtration and separation, separation methods, etc., can solve the problems of unsatisfactory mechanical properties of filters, inability to produce large filters, unstable product quality, etc. Achieve the effects of easy to start filtration, improve thermal shock resistance and compressive strength, and not easy to crystallize

Active Publication Date: 2013-03-27
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention requires controlling the firing atmosphere of the filter to control the quality and level of carbon-carbon bonding, that is, injecting air into the combustion chamber at the beginning of firing, and then stopping the injection to ensure a reasonable level of oxygen in the combustion chamber. The method is difficult to control in production, and it is easy to cause instability of product quality
In addition, if zirconium is not used in the refractory material, large shrinkage will occur during firing, the mechanical strength of the product will decrease, large filters cannot be produced, and there will be greater oxidation during firing.
In addition, according to the preparation method of this patent, in order to meet the filtration requirements of molten steel casting, zirconia must also be used, and other raw materials are used as ceramic materials, and the mechanical properties of the prepared filter cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 38wt% zircon mullite powder, 38wt% pitch, 20% spherical titanium oxide, 0.5% metal silicon powder and 0.5% aluminum powder, 1.5wt% dispersant and 1.5wt% active agent were added to water to prepare slurry.

[0037] This slurry was used to coat the cut 50*50*22, 10 PPI polyurethane foam. The foam coated with slurry is dried and then sprayed with diluted slurry and then dried. The dried product is impregnated with asphalt at about 170°C in a vacuum atmosphere, and then sintered at 950°C to obtain a sample. Put the sample into a muffle furnace and keep it warm at 1100°C for 10 minutes. After taking it out, put it in water at room temperature immediately to conduct a thermal shock resistance test. Repeat the operation for 8 times, and the filter cracks. The compressive strength at room temperature is 1.35Mpa. The pouring test was carried out with molten steel at 50kg, 1630°C, and a pouring pressure head of 500mm, and it was tested that the sample could withstand pouring wi...

Embodiment 2

[0041] Mix 19% spinel powder, 42% pitch, 35% corundum powder (half of which is spherical material), 3% silica sol, 0.5% metal aluminum powder, and 0.5% dispersant. Use a high-efficiency mixer to mix the powder and water to make a slurry, which is used to coat 50*50*22, 10PPI polyurethane foam. After the coated foam is dried, it is coated with a diluted slurry and then dried. Then the product is impregnated with liquid phenolic resin, and finally sintered at 1000°C to obtain a sample. The sample was kept in a muffle furnace at 1100°C for 10 minutes. After taking it out, it was immediately placed in water at room temperature for a thermal shock resistance test. After repeated operations for 8 times, the filter cracked. The normal temperature compressive strength is 2.20Mpa. The pouring test was carried out at 1630°C with 50 kg of molten steel, the product was not broken, and the pouring head was 650mm.

Embodiment 3

[0045] Mix 27% sialon-silicon carbide powder, 18% graphite, 42.5% pitch, 10% spherical zirconia, 2% active silica, and 0.5% dispersant. Use a high-efficiency mixer to mix the above materials and water to make a slurry with a certain viscosity. The mixed slurry is used to coat 50*50*22, 10PPI polyurethane foam. The coated polyurethane foam is dried and then sprayed with diluted slurry once before drying, and then the product is impregnated with tar, and sintered at 800°C in an oxygen-free atmosphere to obtain samples. The sample was kept in a muffle furnace at 1100°C for 10 minutes. After taking it out, it was immediately placed in water at room temperature for a thermal shock resistance test. After repeated operations for 10 times, the filter cracked. The normal temperature compressive strength is 1.63Mpa. The molten steel pouring test was carried out at 1630°C, and the product was not broken.

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Abstract

The invention relates to a foam filter for filtering molten metals. The foam filter comprises bonding materials and ceramic materials bonded together by the bonding materials, wherein the bonding materials comprise carbon substrates connected with network-shaped carbon; and part of the ceramic materials is spherical granular materials. The foam filter has the beneficial effects that the thermal shock resistance and high-temperature impact resistance of the molten metal filter are unexpectedly improved by introducing part of the ceramic materials in the form of spherical granules; in other aspects, the thermal shock resistance and compressive strength are further improved by optimizing formulas, grain sizes and the like; in particular, not only is the cost reduced but also the specific heat capacity of the product is reduced by introducing the high-proportion carbon component to the product; and the filter is easy to start for filtration and does not cause crystallization of the molten metals during starting easily.

Description

technical field [0001] The invention relates to the manufacturing field of filters, more specifically, to a filter for filtering molten metal and a manufacturing method thereof. Background technique [0002] The purification of molten metal plays an important role in improving the mechanical properties of castings. At present, the filter device used for the purification of molten metal is a ceramic filter, which can effectively intercept harmful impurities in the molten metal and change the molten metal from turbulent flow to laminar flow, playing the role of purification and homogenization. According to the structure, ceramic filters can be divided into foam ceramic filters and straight hole ceramic filters. Almost all filters currently used for cast steel are foam ceramic filters. Among all foam filters for molten metal, the requirements for foam filters for cast steel are the highest due to the high melting temperature of molten metal in cast steel. At this temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14
Inventor 祝建勋刘敬浩杨淑金
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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