Multi-Layer Plain Bearing Sputtering for Stronger Layer Adhesion
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Solution Overview
Problem
Existing methods for producing multi-layer sliding bearing elements using cathode sputtering face challenges with insufficient adherence of the deposited metal layer on the substrate, particularly when using materials that are difficult to mix, leading to poor bonding strength.
Innovation Solution
The method involves ion etching the substrate with the target acting as the anode, allowing substrate particles to deposit on the target, which are then reversed in polarity for metal layer deposition, creating a transitional zone with a mixture of substrate and target particles, enhancing adherence without the need for intermediate flushing or separate cleaning steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cathode sputtering is used to deposit metal layer on substrate, then the metal layer can be formed, but the adherence of the deposited layer on the substrate is insufficient
Solution Approach 1:
The substrate undergoes ion etching treatment before the metal layer deposition. This preliminary action removes surface oxides and contaminants from the substrate, creating a cleaner surface that enhances the subsequent adhesion of the metal layer. The ion bombardment activates the substrate surface, improving the bonding strength between substrate and deposited metal layer.
Solution Approach 2:
A transitional zone is created between the substrate and the metal layer through controlled ion etching and deposition processes. This transitional zone acts as an intermediary layer that facilitates the bonding between the substrate and the metal layer, particularly important when using materials that are difficult to mix. The transitional zone contains a gradient of material composition that improves interfacial adhesion.
2Strength
If ion etching is performed to clean substrate surface, then adherence improves, but the process complexity increases due to additional steps
Solution Approach 1:
The ion etching step and the metal layer deposition step are merged into a single continuous process without intermediate flushing or separate cleaning steps. The target polarity is reversed between these steps, allowing the chamber to be used for both etching and deposition without requiring additional cleaning operations. This reduces process complexity while maintaining improved adherence.
Solution Approach 2:
The process maintains continuous useful action by transitioning directly from ion etching to metal layer deposition without idle flushing steps. The chamber atmosphere and process conditions are continuously adjusted through target polarity reversal, eliminating interruptions and maintaining productive operation throughout the sequence.
3Stability of the object's composition
If materials that are difficult to mix are used for substrate and layer, then material properties are optimized, but adherence becomes insufficient
Solution Approach 1:
The transitional zone creates local quality variation at the interface between substrate and metal layer. While the bulk materials maintain their distinct properties (difficult to mix), the interface region develops a gradient composition through controlled ion bombardment and deposition. This local modification at the interface improves bonding strength without compromising the bulk material properties.
Solution Approach 2:
The structure formed is essentially a composite with three distinct regions: the substrate, the transitional zone with mixed materials, and the metal layer. The transitional zone acts as an intermediate composite layer that bridges the two difficult-to-mix materials, enabling strong bonding while preserving the optimized properties of both bulk materials.
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 approach improves the adherence of the metal layer on the substrate by creating a transitional zone with a soft transition of materials, resulting in stronger mechanical clinging and bonding, and simplifies the production process by eliminating the need for intermediate flushing and separate cleaning.
Implementation Method 1
depositing the metal layer on the substrate, whereto target particles are produced from at least one target that is connected as the cathode, said particles being settled on the substrate
Implementation Method 2
ion etching of the surface of the substrate to be coated by ion bombardment, whereby substrate particles are removed from the surface of the substrate
Implementation Method 3
polarity of the target is then reversed for the deposition of the metal layer on the surface of the substrate
Data Source
AI summary
The invention relates to a method for producing a multi-layer sliding bearing element (1), according to which, in a chamber of a cathode sputtering installation a metal layer is deposited on a substrate by means of cathode sputtering of at least one target, said method comprising the steps: introducing a substrate into the chamber of the cathode sputtering installation; ion etching of the surface of the substrate to be coated by ion bombardment, whereby substrate particles are removed from the surface of the substrate; depositing the metal layer on the substrate, whereto target particles are produced from at least one target that is connected as the cathode, said particles being settled on the substrate. In the step of ion etching of the substrate, the target is connected as the anode and at least some of the substrate particles are deposited on the target. The polarity of the target is then reversed for the deposition of the metal layer on the surface of the substrate.