High efficiency stirring method and device of non-gas involved aluminum-boron nitride melt
A stirring method and boron nitride technology, which are applied in chemical instruments and methods, transportation and packaging, chemical/physical processes, etc., can solve the problems of entrainment and low stirring efficiency, and solve the technical problems of entrainment and low stirring efficiency. Effect
Inactive Publication Date: 2018-06-15
BEIJING JIAOTONG UNIV
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- Abstract
- Description
- Claims
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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 aluminum-boron nitride melt without entrained gas and low stirring efficiency.
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-boron nitride melt with no air entrainment and uniform distribution of boron nitride 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-boron nitride melt with uniform distribution of gas and boron nitride particles6.
[0032] It can be seen that under the premise of using variable volume graphite crucible to evacuate 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-free and evenly distributed boron nitride particles. aluminum-boron nitride melt.
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The invention discloses a high efficiency stirring method and device of uncoiled aluminum-boron nitride melt, and belongs to the research field of process of metallurgy and casting materials and the like. The high efficiency stirring method and device of uncoiled aluminum-boron nitride melt stirs the aluminum-boron nitride melt by a mode of combination of a variable volume graphite crucible with straight blades laid on the inside wall and high speed electromagnetic stirring; through the volume of the graphite crucible is reduced, all gas above the melt in the graphite crucible is exhausted byusing the variable volume graphite crucible, and under the condition of the melt is completely isolated from the outside gas, which means under the condition of none gas source, the stirring of the melt is carried out, and then the gas involvement of melt is avoided ultimately; under the circumstance of no constraint of gas involvement, a circumference high speed stirring movement of the aluminum-boron nitride melt is carried out by using the high speed electromagnetic stirring; by using the blades on the inside wall of the graphite crucible, the inside aluminum-boron nitride melt is continually moved around, the upper aluminum-boron nitride melt is moved to the bottom, and then the movement of floating and central segregation of boron nitride particles is prevented, thereby the aluminum-boron nitride melt of evenly distributed non-gas involved aluminum-boron nitride particles is high efficiently obtained, the stirring time can be reduced to 2 minutes, and the technical problems of gasinvolvement and low stirring efficiency existed in the stirring of the aluminum-boron nitride melt are solved.
Description
technical field [0001] The invention belongs to the field of metallurgy, casting and other materials processing research, and in particular relates to a high-efficiency stirring method and device for an air-free aluminum-boron nitride 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 an...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C1/10C22C21/00C22C32/00B01F13/08
CPCC22C1/1036C22C21/00C22C32/0068B01F33/45B01F2101/26C22C1/1047
Inventor 张鹏张伟一杜云慧王玉洁
Owner BEIJING JIAOTONG UNIV