No-air-entrapped copper-boron nitride melt efficient stirring method and device

A stirring method and boron nitride technology, 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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps create uniformly distributed small silicon carbide (SiC) powders on molten metal while avoiding any issues such as clumpings or uneven distributions during mixing. It also speeds up downward rotation for faster processing times at lower temperatures than traditional methods like melting tin oxides.

Problems solved by technology

This patented technical solution described involves preparing an alloy called BON (bismuth oxy) consistently within specific ranges without causing defects or impairments during subsequent processes like heat treatment. Current techniques involve mixing molten solder together while maintaining their temperatures constant but this leads to unwanted gases from inside the mixture. To solve these issues, there have been developed special solutions involving adding bismuth compounds into the process.

Method used

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  • No-air-entrapped copper-boron nitride melt efficient stirring method and device
  • No-air-entrapped copper-boron nitride melt efficient stirring method and device
  • No-air-entrapped copper-boron nitride melt efficient stirring method and device

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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 Copper-boron nitride melt with no entrained gas 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 Copper-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. copper-boron nitride melt.

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Abstract

The invention discloses a no-air-entrapped copper-boron nitride melt efficient stirring method and device, and belongs to the field of such material machining researches as metallurgy and casting. Copper-boron nitride metals are stirred by adopting a mode of combining a variable-volume graphite crucible with straight blades on the inner wall and high-speed electromagnetic stirring; the variable-volume graphite crucible is used for emptying all gas at the upper parts of melts; under the condition of totally isolating from external gas, a peripheral high-speed stirring motion is generated by using high-speed electromagnetic stirring; the straight blades on the inner wall of the graphite crucible are used for stopping upward floating and center gathering movement of boron nitride particles, so that no-air-entrapped copper-boron nitride melts with uniform boron nitride particles are obtained with high efficiency; the stirring time can be shortened to 2 minutes; and the technical problems of air entrapment and low stirring efficiency in copper-boron nitride melt stirring are solved.

Description

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Claims

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Application Information

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Owner BEIJING JIAOTONG UNIV
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