Efficient stirring method and device for gas-entrapment-free aluminium-silicon carbide melt
A stirring method and silicon carbide technology, applied in chemical instruments and methods, transportation and packaging, chemical/physical processes, etc., can solve the problems of air entrainment and low stirring efficiency, and achieve the effect of solving air entrainment and low stirring efficiency
Inactive Publication Date: 2018-06-29
BEIJING JIAOTONG UNIV
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- Abstract
- Description
- Claims
- Application Information
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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 melt due to the problems of entrainment and low stirring efficiency in the stirring of the aluminum-silicon carbide melt
Method used
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Effect test
Embodiment approach 1
[0030] Embodiment 1, under the condition that the power of the high-speed electromagnetic stirring device is 20kW, the rotating speed is 900 rpm, a is 0mm, b is 0mm, c is 0mm, and d is 5mm, after stirring stably for 1 minute and 50 seconds, you can get Aluminum-silicon carbide melt with no air entrainment and uniform distribution of silicon carbide particles6.
Embodiment approach 2
[0031] Embodiment 2, under the condition that the power of the high-speed electromagnetic stirring device is 20kW, the rotating speed is 1200 r / min, a is 20mm, b is 20mm, c is 10mm, and d is 10mm, after 2 minutes of stable stirring, no coil can be obtained Aluminum-silicon carbide melt with uniform distribution of gas and silicon carbide particles6.
[0032] It can be seen that under the premise of using variable volume graphite crucible to empty and isolate the contact between gas and melt, and then under the condition of high power and high speed electromagnetic stirring, the method of the present invention can efficiently prepare gas-entrained and uniformly distributed silicon carbide particles. Aluminum-silicon carbide melt.
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Abstract
The invention discloses an efficient stirring method and device for gas-entrapment-free aluminium-silicon carbide melt and belongs to the field of research of materials processing in metallurgy, casting and other aspects. According to the efficient stirring method and device, the aluminium-silicon carbide melt is stirred through combination of a variable-volume graphite crucible provided with straight blades on the inner wall and high-speed electromagnetic stirring. All gas at the upper part of the melt in the graphite crucible is emptied by reducing the volume of the variable-volume graphitecrucible, then the melt is stirred under the condition that the melt is completely isolated from external gas, namely, the condition that a gas source is absent, and gas entrapment of the melt is avoided fundamentally; high-speed stirring movement of the aluminium-silicon carbide melt in the circumferential direction is produced by high-speed electromagnetic stirring under the condition of no constraint of gas entrapment, the peripheral aluminium-silicon carbide melt is moved to the inside continuously and the aluminium-silicon carbide melt at the lower part is moved to the upper part by the straight blades on the inner wall of the graphite crucible, downward precipitation and centrifugal segregation movement of silicon carbide particles are prevented, so that the gas-entrapment-free aluminium-silicon carbide melt with uniformly distributed silicon carbide particles is obtained efficiently, stirring time can be shortened to 2 min, and the technical problems of gas entrapment and low stirring efficiency in stirring of the aluminium-silicon carbide melt are solved.
Description
technical field [0001] The invention belongs to the research field of metallurgy, casting and other material processing, and in particular relates to a high-efficiency stirring method and device for an air-free aluminum-silicon carbide melt. 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 a...
Claims
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IPC IPC(8): C22C1/10C22C21/00C22C32/00B01F13/08
CPCC22C1/1036C22C21/00C22C32/0063B01F33/45B01F2101/26C22C1/1047
Inventor 张伟一杜云慧张鹏王玉洁
Owner BEIJING JIAOTONG UNIV