Efficient stirring method and device of air-entrapment-free zinc-silicon nitride melt
A stirring method and silicon 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: 2018-06-26
BEIJING JIAOTONG UNIV
View PDF3 Cites 0 Cited by
- 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 that there are problems of entrainment and low stirring efficiency in the stirring of zinc-silicon nitride melt, and a high-efficiency stirring method and device for zinc-silicon nitride melt without entrainment are provided
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
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 Zinc-silicon nitride melt with no gas entrainment and uniform distribution of silicon 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 Zinc-silicon nitride melt with uniform distribution of gas and silicon 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 silicon nitride particles. zinc-silicon nitride melt.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| melting point | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses an efficient stirring method and device of air-entrapment-free zinc-silicon nitride melt, and belongs to the field of machining and researching of metallurgy materials, cast materials and the like. The zinc-silicon nitride melt is stirred through a mode of combining a size-varying graphite crucible of which the inner wall is provided with straight blades, with a high-speedelectromagnetic stirring mode; the size-varying graphite crucible is utilized, the size of the graphite crucible is decreased, all gas on the upper portion of the melt in the graphite crucible is completely exhausted, thus, the melt is stirred under the condition that the melt is completely isolated from external gas, that is, under the condition that no gas source exits, and accordingly, melt airentrapment is avoided fundamentally; high-speed electromagnetic stirring is utilized, under the condition free of air entrapment constraint, the zinc-silicon nitride melt is subjected to high-speed stirring movement in the circumferential direction, through the straight blades on the inner wall of the graphite crucible, the inner zinc-silicon nitride melt is continuously moved to the surroundingportion, the upper zinc-silicon nitride melt is moved to the lower portion, accordingly, silicon nitride particle upward floating and central segregation movement are stopped, the zinc-silicon nitridemelt which is free of air entrapment and contains uniformly distributed silicon nitride particles is obtained efficiently, the stirring time can be shortened to 2 min, and the technical problems thatin the zinc-silicon nitride melt stirring process, air entrapment exists, and the stirring efficiency is low 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 a non-entrained zinc-silicon 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 a...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C18/00C22C32/00B01F13/08
CPCC22C1/1036C22C18/00C22C32/0068B01F33/45B01F2101/26C22C1/1047
Inventor 张鹏张伟一杜云慧王玉洁
Owner BEIJING JIAOTONG UNIV