Dielectric Barrier Discharge Electrode for Ball Milling
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Solution Overview
Problem
Existing high energy ball milling technologies face challenges such as large energy consumption, low efficiency, and heavy pollution, particularly when processing powder materials. Additionally, the introduction of plasma into ball milling devices is difficult due to issues like incomplete and nonuniform particle processing and short electrode life.
Innovation Solution
A plasma assisted high energy ball milling device is introduced, featuring a dielectric barrier discharge electrode bar composed of an inner conductive core and an outer insulation layer made of high purity alumina ceramic. This device uses a vibrating high energy ball milling main engine, an external cold field plasma power supply, and a controllable atmosphere system to efficiently process powder materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma is introduced into the high energy ball milling tank, then the mechanical alloying efficiency is improved, but the electrode life becomes very short due to serious damage from high-speed collision and high-voltage discharge
Solution Approach 1:
A dielectric barrier layer is introduced as an intermediary between the discharge electrode and the ball milling environment. This dielectric layer absorbs and distributes the high-voltage discharge energy, preventing direct damage to the electrode from high-speed ball collisions while still allowing plasma generation for improved mechanical alloying efficiency.
Solution Approach 2:
The discharge electrode is constructed as a composite structure with a conductive core (for electrical conduction) and an outer dielectric barrier layer (for protection). This composite design allows the electrode to withstand both electrical discharge and mechanical impact from grinding balls, significantly extending its service life while maintaining plasma generation capability.
2Productivity
If plasma is introduced into the high energy ball milling tank, then the processing efficiency is improved, but the particle processing becomes incomplete and nonuniform due to powder accumulation and agglomeration
Solution Approach 1:
The ball milling tank is subjected to high-speed vibration, which prevents powder accumulation and agglomeration during the ball milling process. This vibration ensures that all powder particles are continuously exposed to the plasma atmosphere generated by the discharge electrode, achieving complete and uniform particle processing throughout the entire powder batch.
3Device complexity
If conventional high energy ball milling is used, then the equipment structure is simple, but the energy consumption is large and processing efficiency is low
Solution Approach 1:
The invention merges two different energy fields - the mechanical stress field from ball milling and the electric field from plasma discharge - into a single integrated system. This combination allows the plasma energy to assist and enhance the mechanical alloying process, significantly improving processing efficiency while maintaining relatively simple equipment structure through the use of a dielectric barrier discharge electrode bar.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device significantly improves the mechanical alloying efficiency of materials, accelerates powder refinement, and promotes alloying processes, achieving higher processing efficiency and effectiveness in producing cemented carbide, lithium ion batteries, and hydrogen storage alloy powder materials.
Implementation Method 1
A plasma generator typically applies a high-frequency electric field to the reaction gas environment under a negative pressure (vacuum), with the gas ionized under the excitation of a high-frequency electric field to produce plasma.
Implementation Method 2
A plasma generator typically applies a high-frequency electric field to the reaction gas environment under a negative pressure (vacuum), with the gas ionized under the excitation of a high-frequency electric field to produce plasma.
Implementation Method 3
Usually the high energy ball mill is used to process the powder simply through rotation or vibration of the ball milling tank, i.e., using the mechanical energy of the milling ball in the ball milling tank, that is, only the mechanical stress field works.
Implementation Method 4
These ions have high activity and energy that is sufficient to destroy almost all of the chemical bonds and cause chemical reactions on any exposed material surface, resulting in changes in the structure, composition and groups of the material surface
Data Source
Figure 1a~3a
Figure 3b~5
Figure 6~7
AI summary
The present invention provides an application method for cold field plasma discharge assisted high energy ball milled powder and a plasma assisted high energy ball milling device using the method for cold field plasma high energy ball milled powder. The present invention generates plasma by using dielectric barrier discharge and introducing a dielectric barrier discharge electrode bar into a high-speed vibrating ball milling tank, which requires that, on one hand, a solid insulation medium on the outer layer of the electrode bar can simultaneously bear high-voltage discharge and mechanical shock failure of the grinding ball, and on the other hand, the high-speed vibrating ball milling device can uniformly process the powder. Based on the ordinary ball milling technology, the discharge space pressure is set to a non-thermal equilibrium discharge state with a pressure of about 102 to 106 Pa, discharge plasmas are introduced to input another kind of effective energy to the processed powder, so as to accelerate refinement of the powder to be processed and promote the alloying process under the combined action of the mechanical stress effect and the thermal effect of the external electric field, thereby greatly improving the processing efficiency and the effect of the ball mill.