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Ceramic filter containing graphene for molten metal

A technology of ceramic filter and molten metal, which is applied in the direction of filtration and separation, metal processing equipment, chemical instruments and methods, etc., can solve the problems of reducing the mechanical strength of materials, and achieve the effect of improving various properties

Active Publication Date: 2014-12-10
JINAN SHENGQUAN DOUBLE SURPLUS CERAMIC FILTER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relatively loose structure of the material will also reduce the mechanical strength of the material, so there is a contradiction between the mechanical strength and thermal shock resistance of the filter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] During the preparation of the slurry, a high-efficiency mixer can be used to mix the solid and liquid in the slurry. Since graphene is nanoscale, in order to uniformly disperse graphene in the slurry, ultrasonic waves, ball mills or high-speed dispersing machines can be used for mixing.

[0024] The above-mentioned disposable mold is a foam material having a network skeleton, and the above-mentioned slurry of the present invention can be adhered to form a preform. The disposable mold will volatilize, or most of it will volatilize during the subsequent high-temperature treatment, and the carbon element therein remains in the form of activated carbon. Typical foam materials are polyurethane foam, polystyrene foam, polyethylene foam. The slurry can be applied to the disposable form by dipping, rolling, brushing, spraying, etc., with moderate extrusion, such as passing it through two rollers that roll against each other, to squeeze out excess slurry. Preferably, in order ...

Embodiment 1

[0031] Aluminum oxide powder: 81%

[0032] Graphene: 10%

[0033] Aluminum sol binder: 9%

[0034] Carbon fiber: 0.5% (based on the total weight of the first three items)

[0035] The above-mentioned materials are all commercially available materials, and the stated ratios are all percentages by weight. In the above powder, it is necessary to add 0.2% xanthan gum and 20% water accounting for the total weight of the powder. Slurry is made by mixing powder and water with a high-efficiency mixer. This slurry is used to coat polyurethane foam. Sintering is then performed at 1000° C. in an oxygen-free atmosphere.

[0036] The size of the filter made according to this formula is 50×50×15mm, and 50kg of molten steel is filtered at 1650°C. As a result, the filter has withstood the testing conditions and the molten steel has been filtered as required.

[0037] After testing with a flexural tester, the flexural strength of the filter is 1.60±0.2Mpa.

[0038] The filter of the sam...

Embodiment 2

[0040] Corundum powder: 18%

[0041] Mullite: 50%

[0042] Silica powder: 5%

[0043] Silica-alumina gel solution: 20%

[0044] Lignin: 1.0%

[0045] Carbon fiber: 1.0%

[0046] Graphene: 5%

[0047] In the above powder, 12% water needs to be added. Slurry is made by mixing powder and water with a high-efficiency mixer. This slurry is used to coat polyurethane foam. Sintering is then performed at 1000° C. in an oxygen-free atmosphere. The size of the filter made according to this formula is 50×50×15mm, and 50kg of molten steel is filtered at 1650°C. As a result, the filter has withstood the testing conditions and the molten steel has been filtered as required.

[0048] The filter of the same specification prepared under the same conditions, without adding graphene, only filtered 39kg of molten steel at 1650°C, and then it was damaged.

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Abstract

The invention provides a ceramic filter containing graphene for molten metal. The ceramic filter containing graphene comprises main preparation raw materials, including a refractory material, an adhesive and the graphene, wherein the refractory material at least comprises a part of ceramic material. Due to introduction of graphene, the mechanical strength and the thermal shock resistance of the filter are improved.

Description

technical field [0001] The invention relates to a ceramic filter suitable for filtering molten metal, which is mainly used in the foundry industry. 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, the filter needs to maintain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14C04B35/66B22C9/08B22D43/00
Inventor 祝建勋刘敬浩杨淑金
Owner JINAN SHENGQUAN DOUBLE SURPLUS CERAMIC FILTER
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