Grid-Controlled Plasma Apparatus for Polymer Coating
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Solution Overview
Problem
Existing plasma initiated polymerization techniques face challenges with complicated power supply structures, high costs, unstable plasma, and an inability to shorten plasma action time below tens of microseconds, limiting the efficiency and reliability of polymer coating processes.
Innovation Solution
A grid-controlled plasma apparatus and method that divides a vacuum chamber into a discharging cavity and a processing chamber using a metal mesh grid connected with a pulse bias power supply, allowing for controlled plasma release to initiate polymerization, featuring a simple power supply structure, stable plasma, and the ability to shorten plasma action time to microseconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse modulated high frequency glow discharge is used to achieve plasma initiated polymerization, then polymer coating can be formed with unified structure and good adhesion, but the power supply structure becomes complicated and cost increases
Solution Approach 1:
The vacuum chamber is divided into two separate chambers: a discharge chamber for plasma generation and a treatment chamber for polymerization. This segmentation allows the use of simple DC power supply for plasma generation while achieving plasma initiated polymerization effects, eliminating the need for complex pulse modulated high frequency power supplies.
Solution Approach 2:
A metal mesh grid is introduced as an intermediary component between the discharge chamber and treatment chamber. The grid allows plasma particles to pass through while blocking larger plasma structures, enabling controlled plasma initiation in the treatment chamber and simplifying the overall power supply requirements.
2Duration of action of moving object
If pulse modulated high frequency glow discharge is used, then short-time discharge and long-time non-discharge polymerization can be achieved, but the plasma stability deteriorates
Solution Approach 1:
By separating plasma generation and polymerization into different chambers, the system can maintain continuous stable plasma discharge in the discharge chamber while achieving controlled short-time plasma exposure in the treatment chamber during polymerization, thus maintaining both plasma stability and controlling plasma action duration.
Solution Approach 2:
The metal mesh grid acts as a mediator that filters plasma, allowing controlled transmission of plasma particles to the treatment chamber. This enables precise control of plasma action time while the main plasma discharge remains stable and continuous in the discharge chamber.
3Duration of action of moving object
If high frequency power supply with pulse modulation function is used, then plasma action time can be controlled, but the commissioning becomes tricky and cost increases
Solution Approach 1:
The system separates plasma generation (simple DC discharge) from polymerization control (chamber isolation), eliminating the need for complex pulse modulated high frequency power supplies. This segmentation uses standard, easily commissioned components while achieving precise plasma action time control through chamber isolation and grid filtration.
4Reliability
If the vacuum chamber is divided into discharging cavity and processing chamber by metal mesh grid, then the power supply structure is simplified and plasma stability is improved, but the device complexity increases
Solution Approach 1:
The vacuum chamber is segmented into discharge and treatment chambers using a metal mesh grid, which is a simple structural element. This segmentation achieves plasma stability improvement while adding minimal structural complexity, as the grid is a straightforward component that can be easily manufactured and installed.
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 solution provides a cost-effective, easy-to-commission apparatus that generates stable plasma for efficient polymer coating with consistent performance, enhancing adhesion and maintaining the properties of the monomer functional groups, while allowing for precise control over plasma duration.
Implementation Method 1
plasma initiated polymerization techniques are realized by pulse modulated high frequency glow discharge
Implementation Method 2
Plasma polymerization is a method which discharges organic monomer vapors so that various active species can be produced
Implementation Method 3
discharges organic monomer vapors
Implementation Method 4
by grafting reactions with the surface of the base material, the adhesion between the coating layer and the base material can be enhanced
Data Source
AI summary
An apparatus and a method for surface coating by means of grid control and plasma-initiated gas-phase polymerization. The method comprises: dividing a vacuum chamber into a discharging cavity (2) and a processing chamber (3) by using a metal grid mesh (1), the metal grid mesh (1) being insulated from the vacuum chamber; separately feeding carrier gas and monomer steam into the discharging cavity (2) and the processing chamber (3) through different pipes (4, 5), putting a substrate to be processed (11) in the processing chamber (3), and generating in the discharging cavity (2) plasma that continuously discharges; and applying pulse positive bias to the metal grid mesh (1), to release the plasma into the processing chamber (3) to initiate monomer polymerization.