Cylinder Liner Adhesive Metallic Layers Sputtering
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Solution Overview
Problem
Existing methods for manufacturing coated cylinder liners in internal combustion engines often result in non-uniform wear-resistant coatings that can flake off during engine operation, leading to reduced durability and performance.
Innovation Solution
A method involving magnetron sputtering of a consumable metallic electrode, such as chromium or titanium, to form a uniform metallic adhesive layer and a diamond-like carbon (DLC) wear-resistant layer on the inner surface of the cylinder liner, ensuring superior adhesion and preventing flaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coating methods are used to apply wear-resistant coating on cylinder liner inner surface, then the coating process is simple, but the coating becomes non-uniform and flakes off during engine operation
Solution Approach 1:
The patent introduces a metallic adhesive layer as an intermediary between the cylinder liner substrate and the wear-resistant DLC coating. This intermediate layer acts as a mediator that bonds the organic DLC coating to the metallic substrate, preventing flaking while maintaining uniformity. The adhesive layer is applied through sputtering process using a consumable metallic electrode, creating a transition zone that resolves the adhesion problem between dissimilar materials.
Solution Approach 2:
The patent creates a composite structure consisting of three distinct layers: the metallic cylinder liner substrate, the metallic adhesive layer, and the diamond-like carbon wear-resistant coating. This composite material structure combines the advantages of each layer - the substrate provides structural support, the adhesive layer provides bonding, and the DLC layer provides wear resistance. The composite structure resolves the contradiction by distributing functions across multiple materials rather than relying on a single coating.
2Manufacturing precision
If magnetron sputtering is used to deposit metallic adhesive layer and DLC coating, then superior adhesion and uniform thickness are achieved, but the manufacturing process complexity increases
Solution Approach 1:
The patent combines multiple coating operations into a single integrated sputtering process. The consumable metallic electrode serves dual purposes: it acts as the sputtering source for depositing the metallic adhesive layer, and simultaneously provides the material for forming the DLC coating. This merging of functions into one process step reduces equipment complexity compared to using separate deposition systems for each layer.
Solution Approach 2:
The consumable metallic electrode is designed to erode during the sputtering process, automatically replenishing the material source as deposition proceeds. This self-service mechanism eliminates the need for external material feeding systems or complex electrode replacement mechanisms, simplifying the overall device while maintaining consistent coating thickness through self-regulating material supply.
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 method provides a consistently thick, wear-resistant coating with superior adhesion, enhancing the durability and performance of the cylinder liner by maintaining a uniform thickness along the inner surface, thereby reducing wear and extending the liner's lifespan.
Implementation Method 1
magnetron sputtering the metal of the consumable metallic electrode onto the inner surface of the body
Implementation Method 2
sputtering a wear resistant layer, such as a diamond-liked carbon (DLC) coating
Data Source
AI summary
A coated cylinder liner 20 comprises a wear resistant layer 22, such as a DLC coating, and a metallic adhesive layer 24, such as chromium or titanium, deposited on an inner surface 26 thereof. The layers 22, 24 each have a thickness tw, ta varying by not more than 5% along at least 70% of the length of the inner surface 26. The metallic adhesive layer 24 is deposited by sputtering a consumable metallic electrode 28 onto the inner surface 26. The sputtering can be magnetron sputtering. The consumable metallic electrode 28 can include a hollow opening 40 with orifices 50 for providing a carrier gas into the deposition chamber 52. In addition, the inner surface 26 of the cylinder liner 20 can provide the deposition chamber 52 by sealing a first opening 36 and second opening 38 of the cylinder liner 20.