Preparation method of special foamed ceramic filter for magnesium alloy

A foamed ceramic and filter technology, which is applied in the fields of metal materials and metallurgy, can solve the problems of insufficient strength of ceramic filters, easy powder drop, polluted magnesium melt, etc., and achieves removal of macroscopic and microscopic inclusions, good high temperature resistance The effect of compression strength and simple process method

Inactive Publication Date: 2003-04-16
SHANGHAI HAOHUA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For a long time, inclusion defects have been a prominent problem in magnesium alloy casting production. The existence of inclusion defects significantly reduces the mechanical properties of castings, and surface inclusion defects can also reduce the integrity and smoothness of casting surfaces, especially the existence of surface flux inclusions. , will greatly reduce the corrosion resistance of the casting surface
Chinese patent 87102516A discloses a magnesium oxide foam ceramic filter and its preparation process, but the disadvantage of this patent is that novolac is used as a binder, so that the strength of the ceramic filter is insufficient, and the adhesion between ceramic particles Poor, easy to drop powder during use and pollute the magnesium melt
And because the ceramic block is easy to crack during the sintering process and its own strength problems, it is difficult to make a magnesium oxide ceramic filter with a size larger than 150mm×150mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select a polyurethane foam with a porosity of 70%, process it into a size of 100mm×100mm×25mm, soak it in an alkaline solution with a pH of 7.5 at 60°C for 20 minutes to remove the film in the pores of the foam, and then wash it with clean water Rinse to remove the alkaline solution, then dry naturally to remove its water. Use pure magnesia and aluminum phosphate to prepare ceramic slurry, the ratio of magnesia and aluminum phosphate is 1:0.1, then soak the dry polyurethane foam in the evenly stirred mixture slurry of pure magnesia and aluminum phosphate and knead , so that the ceramic slurry is evenly distributed throughout the foam, and then the foam is pressed with a pre-set roller to squeeze out excess slurry. Leaves a thin layer of slurry on the foam. After the blank with the mixture slurry adhered to it is naturally dried for 24 hours, it is baked at 100°C for 3 hours, and then the furnace temperature is slowly raised to 300°C for 2 hours, and then the furnace te...

Embodiment 2

[0018] Select polyurethane foam with a porosity of 75%, process it into a size of 200mm×200mm×30mm, soak it in an alkaline solution with a pH of 8.5 at 50°C for 30 minutes to remove the film in the pores of the foam, and then wash it with clean water Rinse to remove the alkaline solution, then dry naturally to remove its water. Use pure magnesium oxide and aluminum sulfate to prepare ceramic slurry, the ratio of magnesium oxide to aluminum sulfate is 1:0.2, then soak the dry polyurethane foam in the evenly stirred mixture slurry of pure magnesium oxide and aluminum sulfate and knead , so that the ceramic slurry is evenly distributed throughout the foam, and then the foam is pressed with a pre-set roller to squeeze out excess slurry. Leaves a thin layer of slurry on the foam. After the blank with the mixture slurry adhered to it is naturally dried for 24 hours, it is baked at 150°C for 3 hours, and then the furnace temperature is slowly raised to 300°C for 5 hours, and then th...

Embodiment 3

[0020] Select a polyurethane foam with a porosity of 80%, process it into a size of 400mm×400mm×30mm, soak it in an alkaline solution with a pH of 8.5 at 60°C for 30 minutes to remove the film in the pores of the foam, and then wash it with clean water Rinse to remove the alkaline solution, then dry naturally to remove its water. Use pure magnesia and aluminum phosphate to prepare ceramic slurry, the ratio of magnesia to aluminum phosphate is 1:0.3, then soak the dry polyurethane foam in the evenly stirred mixture slurry of pure magnesia and aluminum phosphate and knead , so that the ceramic slurry is evenly distributed throughout the foam, and then the foam is pressed with a pre-set roller to squeeze out excess slurry. Leaves a thin layer of slurry on the foam. After the blank with the mixture slurry adhered to it is naturally dried for 48 hours, put low carbon steel or stainless steel or heat-resistant steel wire as the core bone into the foam plastic coated with the slurry...

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Abstract

A foam ceramic filter for molten Mg-alloy is prepared through preparing slurry from magnesium oxide as raw material and aluminium phosphate (or sulfate) as adhesive in a proportion of 1:(0.05-0.3), coating it on foam polyurethane plastics, drying and high-temp. sintering.

Description

Technical field: [0001] The invention relates to a method for preparing a special foam ceramic filter for magnesium alloys. The prepared filter is used for filtering and purifying magnesium alloy melts, and belongs to the field of metal materials and metallurgy. Background technique: [0002] For a long time, inclusion defects have been a prominent problem in magnesium alloy casting production. The existence of inclusion defects significantly reduces the mechanical properties of castings, and surface inclusion defects can also reduce the integrity and smoothness of casting surfaces, especially the existence of surface flux inclusions. , will greatly reduce the corrosion resistance of the casting surface. Therefore, some important magnesium castings have extremely strict restrictions on inclusion defects. [0003] Foamed ceramics is a new high-efficiency alloy melt filter medium that has emerged in recent years. As a filter material for alloy melts, foamed ceramics must have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20C04B38/06C22B9/02
CPCY02P10/20
Inventor 吴国华卢晨曾小勤丁文江徐小平
Owner SHANGHAI HAOHUA MOLD
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