Efficient stirring method and device for gas-entrapment-free nickel-graphite melt
A stirring method and melt technology, applied in stirring devices, chemical instruments and methods, transportation and packaging, etc., can solve the problems of gas entrainment and low stirring efficiency, achieve uniform distribution of graphite particles, and solve gas entrainment and low stirring efficiency The effect of technical problems
Inactive Publication Date: 2018-09-21
BEIJING JIAOTONG UNIV
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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 nickel-graphite melt without entrained gas and low stirring efficiency.
Method used
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Comparison scheme
Effect test
Embodiment approach 1
[0030] Embodiment 1, under the conditions that the power of the high-speed electromagnetic stirring device is 20kW, the rotating speed is 900 rpm, a is 0 mm, b is 0 mm, c is 0 mm, and d is 5 mm, after stably stirring for 1 minute and 50 seconds, it can be obtained. Nickel-graphite melt 6 with no entrained air and uniform distribution of graphite particles.
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 rpm, a is 20mm, b is 20mm, c is 10mm, and d is 10mm, after stable stirring for 2 minutes, no coil can be obtained. Nickel-graphite melt 6 with uniform distribution of gas and graphite particles.
[0032] It can be seen that under the premise that the variable volume graphite crucible is used to evacuate and isolate the contact between the gas and the melt, and then under the condition of high-power, high-speed electromagnetic stirring, the method of the present invention can efficiently prepare nickel with no entrained gas and uniform distribution of graphite particles. - Graphite melt.
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Abstract
The invention discloses an efficient stirring method and device for gas-entrapment-free nickel-graphite melt, and belongs to the field of study on processing of materials for metallurgy, casting and the like. A method of combining a volume-variable graphite crucible, on the inner wall of which straight blades are distributed, and high-speed electromagnetic stirring is adopted for stirring the nickel-graphite melt; the volume-variable graphite crucible is utilized to exhaust all gases at the upper portion of the melt thoroughly, and then on the condition that the melt is completely isolated from external gas, high-speed electromagnetic stirring is utilized to generate circumferential high-speed stirring movement; the straight blades on the inner wall of the graphite crucible are utilized tostop upward floating and central segregation movement of graphite particles, and thus the gas-entrapment-free nickel-graphite melt of which the graphite particles are uniformly distributed is obtained efficiently. The stirring time can be shortened to 2 minutes, and the technical problems of gas entrapment and low stirring efficiency which exist in stirring of the nickel-graphite melt are solved.
Description
technical field [0001] The invention belongs to the research fields of metallurgy, casting and other material processing, and in particular relates to a high-efficiency stirring method and device for an air-free nickel-graphite 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 and the f...
Claims
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IPC IPC(8): B01F13/08F27D27/00C22C1/10C22C19/03
CPCF27D27/00C22C1/1036C22C19/03B01F33/451B01F2101/26
Inventor 张伟一杜云慧张鹏王玉洁
Owner BEIJING JIAOTONG UNIV