Magnesium oxide ceramic filter for purification of magnesium alloy melt

A technology of ceramic filter and magnesium oxide, which is applied in the field of metallurgy, can solve the problems of low filtration efficiency and poor capacity, and achieve the effect of improving the filtration effect

Inactive Publication Date: 2011-07-13
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a magnesium oxide ceramic filter for the purification of magnesium alloy melts, which solves the problem of low filtration efficiency and poor filtering ability of current magnesium alloy liquid filters, and meets the requirements for preparing high-purity magnesium alloys and castings

Method used

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  • Magnesium oxide ceramic filter for purification of magnesium alloy melt
  • Magnesium oxide ceramic filter for purification of magnesium alloy melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Install the filter on the sprue of the casting. The large-pore surface filter has a diameter of 10PPi and a filter thickness of 20mm. The fine-pore inner filter has a diameter of 30PPi and a filter thickness of 5mm. The middle layer of magnesium oxide ceramic balls The diameter of the magnesium oxide ceramic ball in the layer is 2-5mm, the diameter ratio of the small ball and the large ball in the ceramic ball layer is 1:3, the mixture is uniform, and the thickness is 5mm; AZ31 magnesium alloy is melted in a magnesium alloy melting furnace, and the magnesium alloy is to be When the temperature of the liquid reaches 720°C, keep it warm for half an hour to fully dissolve the alloy and lower the temperature to 690°C before pouring. After the casting is cooled to room temperature, it is cleaned up, and finally a casting with purified alloy liquid is obtained. After inspection, the interior of the casting is basically free of inclusions. things exist.

Embodiment 2

[0023] Install the filter on the sprue of the casting. The diameter of the large-pore surface filter is 20PPi, and the thickness of the filter is 10mm. The aperture of the fine-pore inner filter is 30PPi, and the thickness of the filter is 5mm. The middle layer of magnesium oxide ceramic ball The diameter of magnesium oxide ceramic balls in the layer is 3-8mm, the ratio of small balls to large balls is 1:3, mixed evenly, and the thickness is 8mm; AZ91 magnesium alloy is melted in a magnesium alloy melting furnace, and when the temperature of the magnesium alloy liquid reaches 700°C Keep warm for half an hour to fully dissolve the alloy and lower the temperature to 680°C before pouring. After the casting is cooled to room temperature, clean it up. Finally, a casting with purified alloy liquid is obtained, and there are basically no inclusions inside the casting.

Embodiment 3

[0025] Install the filter on the sprue of the casting. The diameter of the large-pore surface filter is 30PPi, and the thickness of the filter is 5mm. The aperture of the fine-pore inner filter is 40PPi, and the thickness of the filter is 5mm. The middle layer of magnesium oxide ceramic ball The diameter of magnesium oxide ceramic balls in the layer is 3-10mm, the ratio of small balls to large balls is 1:5, mixed evenly, the thickness is 4mm, the casting metal model is preheated to 300°C for standby; AZ91D magnesium alloy is melted in a magnesium alloy melting furnace When the temperature of the magnesium alloy liquid reaches 730°C, keep it warm for half an hour to fully dissolve the alloy and lower the temperature to 690°C before pouring. After the casting is cooled to room temperature, it is cleaned up, and finally the casting is purified by the alloy liquid. Inclusions exist.

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Abstract

The invention relates to a magnesium oxide ceramic filter for the purification of magnesium alloy melt and is characterized in that the magnesium oxide ceramic filter is in a sandwich structure, namely a magnesium oxide ceramic ball layer used as the intermediate layer is added between a macroporous surface layer filter screen and a microporous inner layer filter screen; and the diameters of the magnesium oxide ceramic balls in the magnesium oxide ceramic ball layer are different. The invention belongs to the metallurgical field and in particular relates to a filter for the purification of magnesium alloy melt. In the technical scheme in the invention, as the magnesium oxide ceramic ball layer with different diameters of magnesium oxide ceramic balls is added and used as the intermediate layer, the filtering effect of the filter can be greatly increased, high purity liquid alloy can be obtained and then high purity castings or cast ingots can be obtained.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a filter for smelting and purifying magnesium alloys. Background technique [0002] The chemical properties of magnesium are very active, and it will react with many substances in the environment such as O 2 、H 2 O, N 2 and other reactions, which lead to the inevitable introduction of many inclusions during the production of raw magnesium, magnesium alloy smelting and processing, and various inclusion defects are very easy to form in its castings, which often reduces the quality and usability of magnesium alloy parts and even leads to The casting is scrapped. Inclusions in magnesium alloys are mainly MgO, Mg 3 N 2 Among them, MgO accounts for about 80% of non-metallic impurities, so how to filter and remove impurities such as MgO is very important to improve product quality. [0003] It is a very effective method to filter the metal melt by using the ceramic foam filte...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22B9/02C22B26/22B01D39/06B01D39/00
CPCY02P10/20
Inventor毛萍莉刘正张文政王峰
OwnerSHENYANG POLYTECHNIC UNIV