Pulsed Arc Source for Insulating Layer Deposition
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Solution Overview
Problem
Existing arc source technologies face challenges in producing insulating layers without complex measures and suffer from instability and high spatter formation, especially when using reactive gases, which lead to increased costs and reduced deposition rates.
Innovation Solution
Applying a direct current superimposed by a pulsed or alternating current to the target surface, allowing for stable operation even with insulating layers, reducing spatter, and enhancing deposition rates in pure reactive gas atmospheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reactive gases are used to produce insulating layers by cathodic arc vaporization, then the desired insulating layers can be formed, but the process becomes unstable and spatter formation increases
Solution Approach 1:
The patent applies pulsed direct current instead of continuous DC to the cathode target. This periodic action causes the arc discharge to jump between multiple locations on the target surface during each pulse cycle, preventing the arc from becoming stationary and reducing spatter formation. The pulsed operation allows the target surface to cool between pulses, maintaining stability when producing insulating layers in reactive gases.
2Reliability
If measures are taken to prevent target oxidation and stabilize the arc discharge, then process stability improves, but device complexity and cost increase
Solution Approach 1:
The pulsed DC operation inherently provides arc stabilization without requiring complex additional equipment. The periodic nature of the pulses prevents arc sticking and reduces spatter, while the simple implementation using standard pulsed power supplies avoids increasing device complexity.
3Productivity
If the deposition rate is increased, then productivity improves, but spatter formation and target contamination increase
Solution Approach 1:
The pulsed DC operation allows for high peak currents during the pulse phase, maintaining high deposition rates, while the off-phase between pulses allows the target surface to cool and prevents excessive spatter formation. This periodic action decouples the relationship between deposition rate and spatter, allowing both to be optimized.
4Duration of action of stationary object
If thermal stress on the target is reduced, then target lifetime improves, but deposition rate decreases
Solution Approach 1:
The pulsed DC operation provides high power during short pulse durations for efficient deposition, followed by cooling periods between pulses that reduce cumulative thermal stress on the target. This time-separated operation allows both high deposition rates and reduced thermal loading to coexist, extending target lifetime while maintaining productivity.
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
This method enables stable arc processes with reduced spatter and improved layer quality, allowing for efficient production of insulating layers without additional complexity, increased deposition rates, and lower thermal stress, making it suitable for industrial applications.
Implementation Method 1
a pulsed or alternating current is superimposed on the direct current in such a manner that the arc discharge jumps between different locations
Implementation Method 2
Depositing electrically insulating layers by cathodic arc vaporization is a known technique
Data Source
AI summary
This invention relates to an arc-based method for the deposition of insulating layers and to an arc-based method for low-temperature coating processes, in which an electric arc discharge, ignited and applied on the surface of a target in an arc source, is simultaneously fed a direct current and a pulsed or alternating current.The invention further relates to an arc source in which the target is connected to a power supply unit that encompasses either a minimum of one pulsed high-current power supply 18, 18′ and an additional power supply 13′, 18″, or a power supply 21, 21′, 22 designed with switchable combinatorial circuitry.