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Efficient stirring method and device of gas-entrapment-free aluminum-alumina semisolid slurry

A technology of semi-solid slurry and stirring method, which is applied to 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: 2018-06-12
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 the non-entrained aluminum-alumina semi-solid slurry in the process of stirring the aluminum-alumina semi-solid slurry.

Method used

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  • Efficient stirring method and device of gas-entrapment-free aluminum-alumina semisolid slurry
  • Efficient stirring method and device of gas-entrapment-free aluminum-alumina semisolid slurry
  • Efficient stirring method and device of gas-entrapment-free aluminum-alumina semisolid 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-alumina melt is 615°C, a is 0mm, b is 0mm, c is 0mm, and d is 5mm Under the conditions, after 2 minutes of stable stirring, an aluminum-alumina semi-solid slurry 6 with no air entrainment, uniform distribution of alumina 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-alumina melt is 628°C, a is 20mm, b is 20mm, c is 10mm, and d is 10mm Under the same conditions, after 2 minutes of stable stirring, an aluminum-alumina semi-solid slurry 6 with no air entrainment, uniform distribution of alumina 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, aluminum oxide particle distribution Homogeneous aluminum-alumina semi-solid slurry.

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Abstract

The invention discloses an efficient stirring method and device of gas-entrapment-free aluminum-alumina semisolid slurry and belongs to the field of material processing study of metallurgy and casting. A mode of combining a variable-volume graphite crucible with straight blades distributed on the inner wall with high-speed electromagnetic stirring is adopted to stir aluminum-alumina semisolid slurry; the variable-volume graphite crucible is utilized to empty all gas on the upper portion of the semisolid slurry; then in a condition of completely isolation from outside gas, high-speed electromagnetic stirring is utilized to generate circumferential high-speed stirring motion, and the straight blades on the inner wall of the graphite crucible are utilized to stop downward precipitation and centrifugal segregation motion of alumina particles, so that the aluminum-alumina semisolid slurry without gas entrapment and with the alumina particles distributed uniformly is obtained efficiently; stirring time can be shortened to 2min, so that the technical problems of gas entrapment and low stirring efficiency of the aluminum-alumina semisolid slurry during stirring are solved.

Description

technical field [0001] The invention belongs to the field of metallurgy, casting and other material processing research fields, in particular to a high-efficiency stirring method and device for non-entrained aluminum-alumina 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 high-temperature melt...

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
CPCF27D27/00C22C1/1036C22C21/00C22C32/0036B01F33/451B01F2101/26C22C1/1047
Inventor 张伟一杜云慧张鹏王玉洁
Owner BEIJING JIAOTONG UNIV