Arc Evaporator Coil Layout for Variable Cathode Spot Control
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Solution Overview
Problem
Current ARC sources lack flexibility in adjusting magnetic fields to control the cathode spot path accurately, limiting the ability to make spatiotemporal changes in the arc trajectory during the coating process.
Innovation Solution
An ARC source with a magnet system comprising electromagnetic coils and soft magnetic materials, allowing for independent adjustment of spatial distribution and field strength, enabling variable and oscillating magnetic fields to guide the arc trajectory effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnetic guidance system is used to control the cathode arc movement, then the arc trajectory can be guided over a broad area, but the flexibility for adjusting magnetic field strength and spatial distribution is insufficient
Solution Approach 1:
The magnetic guidance system is divided into multiple independent electromagnetic coils (at least three coils) that can be individually controlled. Each coil can generate magnetic fields with different spatial distributions and strengths, allowing flexible adjustment of the total magnetic field by combining their outputs independently.
Solution Approach 2:
The magnetic field configuration is made dynamic and adjustable through independent control of multiple electromagnetic coils. The system can change magnetic field strength, spatial distribution, and temporal characteristics (including oscillating fields) by adjusting the current in each coil, providing real-time adaptability without structural changes.
2Adaptability or versatility
If electromagnetic coils are used to generate magnetic fields, then flexibility in adjusting field strength and spatial distribution is improved, but the system requires more complex control mechanisms
Solution Approach 1:
Each electromagnetic coil serves multiple functions: generating guide fields, oscillating fields, and composite fields. The same coil configuration can produce different magnetic field patterns by varying current magnitude and phase, eliminating the need for separate mechanisms for different field types.
Solution Approach 2:
The system achieves different magnetic field configurations by changing electrical parameters (current magnitude, frequency, phase) of the electromagnetic coils rather than physically reconfiguring the system. This allows simple control of complex magnetic field patterns through electrical parameter adjustment.
3Manufacturing precision
If the arc trajectory is controlled with fixed magnetic fields, then the system is simpler to operate, but the ability to produce variable structure coatings and nanolayer coatings is limited
Solution Approach 1:
The system employs oscillating magnetic fields generated by the electromagnetic coils to create periodic motion of the cathode spot. This periodic action enables precise control of arc trajectory while increasing material utilization efficiency and deposition rate by systematically covering different target areas.
Solution Approach 2:
The electromagnetic coils provide continuous and adjustable magnetic field control throughout the coating process, allowing the cathode spot to follow optimized paths without interruption. This continuous control maintains high deposition efficiency while achieving precise cathode spot positioning and variable structure coating formation.
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 configuration provides high flexibility in magnet adjustability, allowing for precise control of the cathode spot path, improved target erosion management, and efficient deposition of coatings with variable structures, including nanolayer coatings, while reducing magnetic interference and increasing deposition rate and material utilization efficiency.
Implementation Method 1
a magnet arrangement which is situated beneath the target, comprises an inner and an outer ring coil and is used to produce a magnetic field influencing an electric arc movement on the target surface
Implementation Method 2
a magnetic field influencing an electric arc movement on the target surface
Implementation Method 3
an arc evaporator comprising a target to be operated as cathode material to be evaporated by effect of an arc discharge
Implementation Method 4
a voltage source which is connected to the anode and the cathode and is used to generate an electric arc spot on the target surface
Implementation Method 5
a cathode material to be vaporized in order to produce coating material for depositing a coating film on a substrate surface to be coated
Data Source
Figure 1
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Figure 3a~3b
AI summary
An ARC evaporator comprising: - a cathode assembly, - an electrode arranged for enabling that an arc between an electrode and a front surface of the target can be established, and - a magnetic guidance system placed in front of a back surface of the target characterized in that: the magnetic guidance system comprises means placed in a central region for generating at least one magnetic field and means in a peripherical region for generating at least one further magnetic field, wherein the magnetic fields generated in this manner result in a total magnetic field for guiding the arc and controlling the cathode spot path at the front surface of the target, wherein the means placed in the central region comprises one electromagnetic coil for generating a magnetic field and the means placed in the peripherical region comprises two electromagnetic coils for generating two further magnetic fields.