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High-efficiency stirring method and device for non-gas-entrapment aluminum-silicon carbide semi-solid slurry

A technology of semi-solid slurry and stirring method, which is applied in stirring devices, chemical instruments and methods, transportation and packaging, etc., can solve the problems of entrainment and low stirring efficiency, and achieve the effect of solving entrainment and low stirring efficiency.

Inactive Publication Date: 2018-06-22
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-efficiency stirring method and device for a non-entrained aluminum-silicon carbide semi-solid slurry due to the problems of entrainment and low stirring efficiency in the stirring of aluminum-silicon carbide semi-solid slurry

Method used

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  • High-efficiency stirring method and device for non-gas-entrapment aluminum-silicon carbide semi-solid slurry
  • High-efficiency stirring method and device for non-gas-entrapment aluminum-silicon carbide semi-solid slurry
  • High-efficiency stirring method and device for non-gas-entrapment aluminum-silicon carbide semi-solid slurry

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Embodiment approach 1

[0030] Embodiment 1, the power of the high-speed electromagnetic stirring device is 20kW, the rotation speed is 900 rpm, the stirring temperature of the aluminum-silicon carbide melt is 615°C, a is 0mm, b is 0mm, c is 0mm, and d is 5mm Under these conditions, after 2 minutes of stable stirring, an aluminum-silicon carbide semi-solid slurry 6 with no air entrainment, uniform distribution of silicon carbide particles, and a solid phase ratio of 25% can be obtained.

Embodiment approach 2

[0031] Embodiment 2, where the power of the high-speed electromagnetic stirring device is 20kW, the rotation speed is 1200 rpm, the stirring temperature of the aluminum-silicon carbide melt is 628°C, a is 20mm, b is 20mm, c is 10mm, and d is 10mm Under these conditions, after 2 minutes of stable stirring, an aluminum-silicon carbide semi-solid slurry 6 with no air entrainment, uniform distribution of silicon carbide particles, and a solid phase ratio of 15% can be obtained.

[0032] It can be seen that under the premise of using variable volume graphite crucible to evacuate and isolate the contact between gas and semi-solid slurry, and then under the condition of high power and high speed electromagnetic stirring, the method of the present invention can efficiently prepare gas-free, silicon carbide particle distribution Homogeneous aluminum-silicon carbide semi-solid slurry.

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Abstract

The invention discloses a high-efficiency stirring method and device for non-gas-entrapment aluminum-silicon carbide semi-solid slurry, and belongs to material processing and research fields of metallurgy, foundry industry and the like. A volume-variable graphite crucible of which the inner wall is distributed with straight blades is combined with high-speed electromagnetic stirring so as to stiraluminum-silicon carbide semi-solid slurry; the volume-variable graphite crucible is utilized for emptying all gas at the upper part of the semi-solid slurry, so that under the condition that the semi-solid slurry is completely isolated from the external gas, high-speed electromagnetic stirring is utilized for generating circumferential high-speed stirring motion; and the straight blades on the inner wall of the graphite crucible are utilized for preventing downward precipitation and centrifugal segregation motion of silicon carbide granules, thereby obtaining non-gas-entrapment aluminum-silicon carbide semi-solid slurry with uniformly-distributed silicon carbide granules at high efficiency. The stirring time can be shortened to two minutes, and the technical problems of gas entrapment andlow stirring efficiency existing in the stirring process of the aluminum-silicon carbide semi-solid slurry are solved.

Description

technical field [0001] The invention belongs to the field of metallurgy, casting and other material processing research fields, and in particular relates to a high-efficiency stirring method and device for non-entrained aluminum-silicon carbide semi-solid slurry. Background technique [0002] In metallurgy, casting and other material processing research fields, it is often necessary to stir various melts, such as metal semi-solid slurry, stirring of particle melts, etc., in order to make the temperature, composition, structure, etc. of the melt uniform change. Stirring efficiency usually depends on the stirring intensity. The greater the stirring intensity, the stronger the shear and turbulence formed, the shorter the stirring time for the melt to achieve homogenization of temperature, composition, structure, etc., and the higher the stirring efficiency. However, strong stirring will lead to the problem of entrained air in the melt, which can easily cause oxidation of the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/08F27D27/00C22C1/10C22C21/00C22C32/00
CPCF27D27/00C22C1/1036C22C21/00C22C32/0063B01F33/451B01F2101/26
Inventor 张鹏张伟一杜云慧王玉洁
Owner BEIJING JIAOTONG UNIV