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High energy ball mill method with plasma aid

A plasma and high-energy ball milling technology, applied in grain processing, etc., can solve the problems of low input mechanical energy of powder, long time required for processing, serious powder agglomeration, etc., and achieve shortened time required, large deformation and fine grain short time effect

Active Publication Date: 2007-08-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantages are: affected by the vibration amplitude of the ball mill tank, the mechanical energy input to the powder is not very high, the particle size of the product powder is basically at the micron level, and the powder agglomerates seriously, the particle size distribution is wide, and it is difficult to obtain a powder with a particle size at the nanometer level; The processing efficiency is low, and when it is applied to mechanical alloying, the processing takes a long time

Method used

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  • High energy ball mill method with plasma aid
  • High energy ball mill method with plasma aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] As shown in Figure 1, realize the plasma-assisted high-energy ball milling device of the present invention, comprise driving motor 1, ball mill jar 2, frame 3, base 4, ball mill jar 2 is installed on the frame 3, and grinding ball 5 is placed inside it , The frame 3 is installed on the base 4 through the spring 6, and an excitation block 7 is arranged on the outside thereof. The drive motor 1 is installed on the base 4, and is connected with the frame 3 and the excitation block 7 through an elastic coupling 8, respectively.

[0030] As shown in Figures 2 and 3, the grinding ball 5 is placed in the ball milling tank 2, and the ball milling tank 2 is also connected with an electrode rod 9 and a plasma power supply 10. The ball milling tank 2 includes a cylinder body 2-1, a front cover plate 2-2, The rear cover 2-3, the flanges at both ends of the cylinder body 2-1 are respectively sealed and connected with the front cover 2-2 and the rear cover 2-3 through the sealing ring...

Embodiment 2

[0040] Using the device of Example 1, the process conditions of this plasma-assisted high-energy ball milling method are basically the same as those of Implementation 1, except that the total volume of balls accounts for 75% of the volume of the ball milling tank, and balls with a diameter of 22 mm account for 75% of the total ball milling volume. 15%, grinding balls with a diameter of 18mm accounted for 75% of the total number of grinding balls, grinding balls with a diameter of 10mm accounted for 10% of the total number of grinding balls, and the loose volume of the powder to be processed accounted for 130% of the gap between the grinding balls; the negative pressure of the ball mill tank to 0.01Pa; the discharge voltage is 3kv, the frequency is 5kHz to realize corona discharge; the excitation block adopts 10mm double amplitude, and the motor speed is 930r / min.

Embodiment 3

[0042] Using the device of Example 1, the process conditions of this plasma-assisted high-energy ball milling method are basically the same as those of Implementation 1, except that the total volume of balls accounts for 72% of the volume of the ball milling tank, and balls with a diameter of 20 mm account for 72% of the total ball milling volume. 12%, grinding balls with a diameter of 18mm accounted for 78% of the total number of grinding balls, grinding balls with a diameter of 10mm accounted for 10% of the total number of grinding balls, and the loose volume of the powder to be processed accounted for 80% of the gap between the grinding balls; the negative pressure of the ball mill tank to 0.05Pa; the discharge voltage is 10kv, the frequency is 20kHz, and corona discharge is realized; the excitation block adopts 8mm double amplitude, and the motor speed is 930r / min.

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Abstract

A plasma aided high-energy ball grinding method includes such steps as installing the front cover plate and rod electrode of ball grinder, respectively connecting the ball grinder and rod electrode to the poles of plasma power supply, loading the powder to be ground in the ball grinder, pumping negative pressure, filling discharging gas medium, turning on the plasma power supply, regulating discharge parameters for corona discharge or glow discharge, and turning on the motor to drive the vibration exciting block for ball grinding.

Description

technical field [0001] The invention relates to nano-micron powder preparation and mechanical alloying methods, and in particular provides a plasma-assisted high-energy ball milling method. Background technique [0002] The method of preparing alloy powder by high-energy ball milling is one of the most commonly used technologies for nano-micron material preparation and mechanical alloying. It usually uses high-energy ball mill rotation or vibration to refine metal or alloy powder to nano-micron scale, that is: two Or two or more powders are put into the ball milling tank of the high-energy ball mill at the same time for high-energy ball milling. The powder particles are calendered, pressed, crushed, and pressed repeatedly (that is, cold welding-crushing-cold welding). The powder grain and particle size are continuously refined, and finally nano-micron ultrafine alloy powder with uniform distribution of structure and composition can be obtained. Because this method can use m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C17/14B02C19/18
Inventor 朱敏戴乐阳曹彪曾美琴欧阳柳章童燕青李北
Owner SOUTH CHINA UNIV OF TECH
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