Brittle Coating Source Structuring for PVD Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Brittle materials used in physical vapor deposition coating sources face challenges during processing due to mechanical fragility, thermal stresses, and random crack formation, leading to deformation and breakage, which complicates their manufacturing and usage in complex geometries.
Innovation Solution
A coating source with a brittle material featuring controlled surface structuring in the form of indentations, grooves, or notches, which introduces cracks that follow a predictable pattern, reducing the likelihood of random flaking and enhancing process stability by aligning crack propagation with the structuring, thereby minimizing contamination and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If support elements are added to brittle coating sources to prevent deformation, then mechanical stability is improved, but the complexity of the coating source structure increases
Solution Approach 1:
The patent applies preliminary action by introducing cracks into the brittle coating material before the coating process begins. These pre-introduced cracks serve as stress relief pathways that prevent uncontrolled crack formation during operation, thereby improving mechanical stability without requiring additional support elements that would increase structural complexity.
2Temperature
If cooling plates are applied to dissipate heat during coating, then thermal management is improved, but mechanical load on the brittle coating source increases leading to deformation or breakage
Solution Approach 1:
The patent introduces cracks into the brittle coating material before the coating process as a preliminary action. These pre-existing cracks allow the material to accommodate thermal stresses from cooling plates during operation, preventing deformation or breakage while maintaining effective thermal management.
3Reliability
If cracks are introduced randomly in brittle coating material to prevent crack formation during coating, then process stability is improved, but small pieces of coating material may flake off causing contamination
Solution Approach 1:
The patent applies local quality by concentrating cracks along specific predetermined lines rather than distributing them randomly throughout the coating material. This localized crack arrangement ensures that cracks follow controlled pathways, preventing uncontrolled flaking and contamination while maintaining process stability.
Solution Approach 2:
The patent introduces cracks along predetermined lines before the coating process as a preliminary action. This pre-structuring of crack locations ensures that subsequent stress-induced cracks follow these predetermined pathways, preventing random flaking and contamination while maintaining process stability.
4Manufacturing precision
If the coating source thickness is decreased to improve coating precision, then manufacturing precision is improved, but the coating source becomes more susceptible to deformation and breakage
Solution Approach 1:
The patent introduces cracks into the brittle coating material before the coating process as a preliminary action. This allows the use of thinner coating sources for improved precision while the pre-introduced cracks provide stress relief pathways that prevent deformation and breakage despite the reduced thickness.
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 controlled crack formation ensures reliable and reproducible operation of the coating source, preventing material flaking and maintaining process stability, even under high power densities, by aligning crack propagation with the structural design, thus improving the coating process reliability and reducing material loss.
Implementation Method 1
the coefficient of expansion of the support/heat sink must be less than that of the coating material
Implementation Method 2
cracks are introduced in a targeted manner into a brittle coating material via indium bonding in order to prevent crack formation during the coating process itself
Implementation Method 3
by applying a support element with increased thermal conductivity compared to the coating material, the heat generated in the coating process can be better dissipated
Implementation Method 4
In physical vapor deposition (PVD), starting material is converted into the vapor phase using physical processes and then deposited on a substrate to be coated
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a coating source for physical vapor deposition having a coating material that consists of a brittle material and that has cracks. The coating source also has a support element, which is connected to the coating material at a surface of the coating material. The coating material has a structure on at least parts of a surface of the coating material. The invention further relates to a method for producing a coating source.