Apparatus and method for liquid metals treatment

一种液体金属、熔体的技术，应用在金属加工设备、铸造设备、照明和加热设备等方向，能够解决液体金属处理有效性和效率折衷等问题，达到促进动力学条件、提高均匀性的效果

Active Publication Date: 2013-05-08
BRUNEL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the stirring speed must be limited in order to obtain a relatively stable liquid surface, and as a result both the effectiveness and efficiency of liquid metal processing are compromised

Method used

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  • Apparatus and method for liquid metals treatment
  • Apparatus and method for liquid metals treatment
  • Apparatus and method for liquid metals treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0126] The AZ91D magnesium alloy was melted at 680°C and then passed with reference image 3 Methods and apparatus for performing intense melt shear with conditioning at temperatures below liquidus. The conditioned AZ91D semi-solid slurry was fed to a standard cold chamber high pressure die casting machine to cast tensile test specimens. Figure 8 The uniform and fine microstructure of AZ91D samples prepared by semi-solid processing according to the present invention is shown.

Embodiment 2

[0128] LM24 cast aluminum alloy and AA7075 wrought aluminum alloy were melted at 700°C and then treated with the Image 6 The method and equipment implemented in Degassing. The gas content in liquid aluminum alloys was evaluated by the reduced pressure test (RPT) using the density index as an indication of the gas content in the melt (the higher the density index, the higher the gas content). For recycled LM24 alloy, in use Image 6 The density index decreased from 13.60% to 2.66% after 1 minute of degassing with the method and apparatus of the embodiment shown in . For fresh AA7075 alloy, the density index decreases from 9.32% to 0.69%.

Embodiment 3

[0130] at 630°C according to the invention according to reference Image 6 Method and Apparatus for Fabrication of MMCs Based on AZ91D Magnesium Alloy Using Strong Melt Shearing. The AZ91D magnesium alloy was melted at 650°C. refer to Image 6 , preheated silicon carbide particles were added to the melt via the feed tube (26) by means of strong melt shear, and the melt and silicon carbide particles were then strongly sheared for an additional 5 minutes. The prepared Mg / SiC slurry was then fed to a standard cold chamber high pressure die casting machine to cast the MMC samples. Figure 9 Shows a fine and uniform structure and well-distributed silicon carbide particles in the Mg matrix.

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Abstract

This invention relates to an apparatus (high shear device) and method for treating liquid metals by intensive melt shearing. The apparatus comprises a stator and a rotor with a small gap between them to provide intensive melt shearing for dispersing efficiently and distributing uniformly gas, liquid and solid phases in liquid metals without severe turbulence at the melt surface. The device can be extended to a multistage high shear pump by arranging individual rotor / stator assemblies either concentrically (one in another) or vertically. The device and high shear pump can be readily integrated into existing casting processes. The device is suitable for use in casting processes including high pressure die casting, low pressure die casting, gravity die casting, sand casting, investment casting, direct chill casting, twin roll casting, and any other casting process which requires liquid metal as a feedstock. In addition, the device is particularly suitable for providing conditioned liquid metal for both shape casting and continuous (or semi-continuous) casting of metallic materials, preparing high quality semi-solid slurries, solidification processing of particulate reinforced metal matrix composites, mixing immiscible metallic liquids and degassing of liquid metals prior to any casting processes.

Description

[0001] The present invention relates generally to the treatment of liquid metals prior to the solidification process of metallic materials, and in particular to devices for shearing liquid metals. The present invention provides means for controlling inclusions and gas elements, homogenizing melt composition and temperature, facilitating kinetics for any chemical reaction or phase inversion involving a liquid phase, mixing materials containing heterogeneous phases , refining casting microstructure and eliminating / reducing casting defects. The invention can be applied to various casting techniques such as high pressure die casting, low pressure die casting, gravity die casting, sand casting, investment casting, direct chill casting, twin roll continuous casting, and any other casting process that requires liquid metal as a raw material . Background of the invention [0002] Liquid metal treatment prior to solidification processing is required for a variety of casting processes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D27/00
CPCF27D27/005B22D45/00F27D27/00B22D11/10
Inventor 范仲云左玉波姜博
Owner BRUNEL UNIVERSITY
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