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Method for improving normal temperature strength of foamed ceramic filter

A foam ceramic and filter technology, which is applied in chemical instruments and methods, separation methods, filtration and separation, etc., can solve the problems that the filter cannot achieve the filtering effect, the strength of the filter at room temperature is low, and the rejection rate of castings is increased, and the brittleness is achieved. The effect of reducing, improving toughness, and reducing slag drop rate

Active Publication Date: 2008-01-23
JINAN SHENGQUAN DOUBLE SURPLUS CERAMIC FILTER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the brittleness of the ceramic filter itself, the foamed ceramic filter after firing has fine mesh bars and burrs. During transportation and use, the filter will drop slag, and the slag will enter the casting, resulting in casting rejection rate. At the same time, due to the low strength of the filter at room temperature, the filter has missing edges and corners, etc. During the pouring process, the molten metal passes through the bypass, and the filter cannot achieve a real filtering effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The sintered φ50*15mm 20ppi foam ceramic filter for cast aluminum was sprayed with 1.5wt% polyvinyl alcohol aqueous solution on the surface of the filter, then dried naturally for 6 hours, and the normal temperature compressive strength of the filter was tested. At the same time, it is compared with the filter without spraying, as shown in Table 1.

[0015] Performance table before and after spraying of table 1 embodiment 1

[0016] before spraying

Embodiment 2

[0018] The sintered 75*75*25mm 6ppi silica gel foam ceramic filter is 50wt% phenolic resin (this phenolic resin belongs to alkaline water-soluble, weight average molecular weight is 1000-1500, and viscosity is 200-350CP) to filter with water content Spray on the surface of the filter, and then dry it at 200°C for 2 hours to test the strength of the filter at room temperature. At the same time, it is compared with the filter without spraying, as shown in Table 2.

[0019] Performance table before and after spraying of table 2 embodiment 2

[0020] before spraying

Embodiment 3

[0022] Spray the sintered 60*60*22mm 15ppi cast iron foam ceramic filter with 15% silica sol on the surface of the filter, and then dry it at 110°C for 1 hour to test the strength of the filter at room temperature. At the same time, it is compared with the filter without spraying, as shown in Table 3.

[0023] Performance table before and after spraying of table 3 embodiment 3

[0024] before spraying

after spraying

increase or decrease

Bulk density (g / cm 3 )

0.40

0.42

increase by 5%

Normal temperature compressive strength (MPa)

1.8

2.4

33.3% increase

Slag drop rate (%)

0.026

0.009

65.4% reduction

[0025] The filters after spraying in the above-mentioned Examples 1-3 and 20 pieces of ordinary filters (total 80 pieces) were under the same conditions, and the field pouring test was carried out at the same time, and all the filters passed the test. The pouring test conditions are shown in T...

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Abstract

The invention discloses a method capable of improving the atmospheric temperature strength of the foamed ceramics filter. Through spraying and coating a layer of organic or inorganic materials on the surface of the sintered foamed ceramics filter and through natural drying or drying, the invention can greatly improve the atmospheric temperature strength of the filter and does not affect the service performance of the filter, which is beneficial for the filter to overcome the defects caused in transport and use, thereby ensuring the further increase of the casting quality.

Description

technical field [0001] The invention relates to the preparation of casting utensils, in particular, the invention relates to a method for improving the normal-temperature mechanical properties of foam ceramic filters during the preparation process. Background technique [0002] Ceramic foam filter is a new type of filter developed in the past ten or twenty years. Due to its special three-dimensional mesh structure and good filtering effect, it has attracted widespread attention and can be used in casting, metallurgy, and aluminum alloy profiles. and chemical industries. Ceramic foam filter can effectively eradicate large inclusions in molten metal, remove small inclusions in molten metal, improve organizational structure, and effectively reduce the content of gases and harmful elements in molten metal. [0003] People have successively developed filters such as aluminum oxide for filtering molten aluminum in the foundry industry, silicon carbide for filtering molten iron, z...

Claims

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Application Information

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IPC IPC(8): C04B41/81B01D25/22B22D43/00
Inventor 祝建勋刘敬浩徐传伟
Owner JINAN SHENGQUAN DOUBLE SURPLUS CERAMIC FILTER
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