Plasma Gas Premixing for Stable Low-Voltage Ignition
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Solution Overview
Problem
Existing coating equipment struggles with achieving consistent plasma ignition due to uneven distribution of plasma gas, requiring increased voltage and flow rates which destabilize the process.
Innovation Solution
A gas mixing method that pre-mixes plasma gas with an auxiliary gas and introduces the mixture into the reaction chamber, combined with an integrated airflow merging and diverting device, to enhance plasma ignition without altering pressure or bias size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow rate of plasma gas is increased to improve distribution in the reaction zone, then plasma ignition becomes easier, but the pressure in the reaction chamber increases and the process becomes unstable
Solution Approach 1:
The gas introduction system is segmented into multiple gas inlets distributed across the reaction chamber. Instead of introducing plasma gas through a single high-flow inlet, the system uses multiple lower-flow inlets positioned at different locations, which distributes the plasma gas more uniformly throughout the reaction zone without causing pressure instability.
Solution Approach 2:
The patent applies local quality by providing different gas flow characteristics at different locations within the reaction chamber. Each gas inlet is positioned to deliver plasma gas to specific regions where it is needed, creating locally optimized gas distribution rather than relying on high overall flow rates that destabilize the entire system.
2Reliability
If the voltage of the biasing signal is increased above 800 volts to achieve plasma ignition, then plasma ignition occurs, but the process requires extended time and higher energy consumption
Solution Approach 1:
The system performs preliminary action by pre-distributing plasma gas uniformly throughout the reaction zone before applying the biasing signal. This preliminary gas distribution ensures that plasma ignition conditions are already prepared across the entire reaction zone, so when the biasing signal is applied at normal voltage levels, plasma ignition occurs reliably without requiring excessive voltage or energy.
3Manufacturing precision
If the flow rate of reactive gas is increased to maintain sputtering characteristics, then coating quality is maintained, but the overall pressure in the reaction chamber increases
Solution Approach 1:
The reactive gas introduction is segmented into multiple controlled inlets that deliver gas locally to the reaction zone. This segmentation allows precise control of reactive gas distribution, maintaining the gas concentration needed for high-quality coating formation without requiring high overall flow rates that would increase chamber pressure.
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 method enables reliable plasma ignition at lower voltages and without increasing gas pressure, improving ignition efficiency and process stability.
Implementation Method 1
By applying a biasing signal to the holder plate 3, a biasing field is generated, which causes the plasma gas to undergo plasma ignition
Implementation Method 2
providing a biasing field to the accommodating space
Data Source
AI summary
A gas mixing method to enhance plasma includes: providing a reaction chamber; wherein the reaction chamber includes an accommodating space and the reaction chamber includes a top opening connected to the accommodating space; providing an adapter plate, and fixing the adapter plate to the reaction chamber to be arranged corresponding to the top opening; wherein the adapter plate further includes a window area communicating both sides of the adapter plate; providing a target disposed on top of the adapter plate to seal the top opening; premixing a plasma gas and an auxiliary gas into a gas mixture, and introducing the gas mixture into the accommodating space; and providing a biasing field to the accommodating space.