EB-PVD Beam Trap for Temperature Stabilization
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Solution Overview
Problem
In electron beam physical vapor deposition (EB-PVD) processes, the shutdown of one electron beam source to avoid blocking by workpieces leads to a temporary interruption of energy input, causing a temperature decrease in the coating chamber, which can impair the morphology and adhesion of the coating, especially during thermocyclic loading.
Innovation Solution
A coating arrangement and method that include an electron beam gun, a beam trap, and a control device to switch between configurations where the electron beam is directed onto or past the beam trap, allowing continuous energy input and temperature stabilization by diffusely radiating energy back into the process chamber, and a dual high-voltage supply for independent operation of electron beam sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electron beam source is switched off to prevent workpiece blocking, then the workpiece damage is avoided, but the temperature in the coating chamber decreases below the required coating temperature
Solution Approach 1:
A beam trap is introduced as an intermediary component between the electron beam source and the workpiece. The beam trap absorbs the electron beam when workpieces are in the blocking position, preventing direct electron beam exposure to workpieces while maintaining continuous energy input into the system through the beam trap, thereby preventing temperature drop in the coating chamber
Solution Approach 2:
The beam trap is positioned and configured in advance to intercept the electron beam before it can reach the workpiece during blocking periods. This preliminary interception allows the system to maintain continuous operation without temperature interruption, as the beam trap is already in place to handle the electron beam energy
2Temperature
If a dual high-voltage supply is used to enable independent operation of electron beam sources, then continuous energy input is maintained, but the system complexity and cost increase
Solution Approach 1:
The beam trap serves multiple functions: it protects workpieces from electron beam damage during blocking periods, maintains continuous energy input to prevent temperature drop, and enables the use of a simpler dual high-voltage supply configuration by providing a safe target for the electron beam when workpieces are present
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 solution maintains a stable temperature during the coating process, enhancing the morphology and adhesion of the coating layers while allowing for a cost-effective, independent operation of multiple electron beam sources, reducing the need for a more expensive dual high-voltage supply.
Implementation Method 1
an electron beam gun (112) for providing an electron beam (23)
Implementation Method 2
the electron beam is directed onto the beam trap (202)... allowing continuous energy input and temperature stabilization
Implementation Method 3
diffusely radiating energy back into the process chamber
Implementation Method 4
electron beam physical vapor deposition (EB-PVD)... the material to be evaporated (referred to as target material or evaporation material) is melted by means of the electron beam
Data Source
AI summary
In accordance with various embodiments, a coating arrangement may comprise: an electron beam gun for providing an electron beam; a beam trap for trapping the electron beam; a control device for driving the electron beam gun and/or the beam trap, wherein the control device is configured to switch over the driving between a plurality of configurations, of which: in a first configuration, the electron beam is directed onto the beam trap; and in a second configuration, the electron beam is directed past the beam trap.