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Preparation method of magnesium oxide foam ceramic filter for filtering magnesium and magnesium alloy melt

A foamed ceramic and magnesium alloy technology, applied in the metallurgical field, can solve the problems of high sintering temperature and high energy consumption.

Inactive Publication Date: 2011-12-21
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101138691 CN87102516 CN101164656 and other foam ceramics with magnesium oxide as the main body generally have a sintering temperature between 1450°C and 1800°C, and the commonly used temperature is 1650°C. The sintering temperature is relatively high and consumes a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Immerse the polyurethane foam template with a pore size of 10PPI and a size of 100×100×25mm in 10% NaOH aqueous solution at 50°C, take it out after 30 minutes, wash it with clean water to remove the residual lye on the template surface, and then dry it naturally for later use. Fused magnesium oxide, magnesium fluoride and water are taken in a mass ratio of 50:10:40 and placed in a ball mill and mixed for 1 hour to obtain a uniform water-based dispersion slurry. The spare polyurethane formwork is dipped in the slurry repeatedly and centrifuged to make the slurry adhere to the foam network to obtain a blank. Then place the prepared plain embryo in an oven at 50°C for 2 hours, and then place it in an oven at 120°C for another 2 hours. ℃ for sintering, and heat preservation for 2h, natural cooling can get magnesium oxide foam ceramic filter.

Embodiment 2

[0024] Immerse the polyurethane foam template with a pore size of 20PPI and a size of Φ200×25mm in 10% NaOH aqueous solution at 50°C, take it out after 30 minutes, wash it with clean water to remove the residual lye on the template surface, and then dry it naturally for later use. Fused magnesium oxide, magnesium fluoride and water are taken in a mass ratio of 50:15:35 and placed in a ball mill and mixed for 1 hour to obtain a uniform water-based dispersion slurry. The spare polyurethane formwork is dipped in the slurry repeatedly and centrifuged to make the slurry adhere to the foam network to obtain a blank. Then place the prepared plain embryo in an oven at 50°C for 2 hours, then place it in an oven at 120°C for another 2 hours, and finally place the plain embryo in a high-temperature furnace and heat it up to 1300 °C at a rate of 3°C / min. ℃ for sintering, and heat preservation for 2h, natural cooling can get magnesium oxide foam ceramic filter.

[0025] The above implemen...

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Abstract

The invention provides a magnesium oxide ceramic foam filter for filtering a magnesium and magnesium alloy melt and a preparation method thereof, relating to the field of metallurgy. The process is as follows: a polyurethane foam template is soaked in sodium hydroxide solution (10%) for 30 minutes under the temperature of 50 DEG C and is then washed by water and dried; electric-melting magnesium oxide, magnesium fluoride and water are mixed in a ball-milling manner according to the mass ratio so as to obtain water-based dispersion slurry; the polyurethane foam template is soaked in the slurry, and bisque is obtained through repeated slurry dipping and centrifugal slurry throwing; the bisque is put into an oven; finally, the dried bisque is put into a high-temperature furnace, is heated to 1,200 to 1,300 DEG C at the speed of 1 to 3 DEG C / min, is heat-preserved for 2 hours, and is then naturally cooled in a furnace body. An obtained product of the invention has good chemical stability in the magnesium and the magnesium alloy melt, does not pollute the magnesium and the magnesium alloy melt, has good functions of absorbing and filtering nonmetallic inclusions in the magnesium and the magnesium alloy melt, and is suitable for filtering as well as purifying the magnesium and the magnesium alloy melt.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for developing a foam ceramic filter, that is to say, the involved magnesium oxide foam ceramic filter is suitable for filtering and purifying magnesium and magnesium alloy melts. Background technique [0002] Magnesia foam ceramic filter has a good three-dimensional network skeleton structure, which can filter various inclusions and impurities in magnesium and magnesium alloy melts, improve the internal quality of castings and reduce defects. At present, the magnesia foam ceramic filter has broad application prospects in the magnesium metal casting industry, but the sintering temperature of the magnesia foam ceramic filter is high, and the energy consumption is large, which limits its large-scale promotion and use. [0003] Various inclusion defects in magnesium and magnesium alloy castings often lead to reduced performance or even scrapping of castings, which has become one o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/02B01D39/20
CPCY02P10/20
Inventor 张文政黄丽王趱姜敏
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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