Ti-TiC Intermediate Layer for DLC Adhesion
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Solution Overview
Problem
DLC film-coated members experience peeling at the interface between the intermediate layer and the DLC layer during high-load sliding, leading to potential seizure issues between the DLC film and a mating member, despite improved adhesion in Rockwell indentation tests.
Innovation Solution
An intermediate layer comprising a Ti layer and a TiC layer with a carbon content of 53% to 77% is formed between the base material and the DLC layer, using a sputtering method with specific argon and acetylene gas flow rate ratios to enhance adhesion and prevent peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an intermediate layer is formed to improve adhesion between base material and DLC layer, then adhesion is improved in Rockwell indentation test, but peeling occurs at the interface during high-load sliding
Solution Approach 1:
The invention changes the compositional parameters of the intermediate layer by controlling the carbon content to be 53 at% or more and 77 at% or less. This parameter optimization transforms the intermediate layer from a conventional Ti/TiC structure to a carbon-enriched TiC-dominated layer, which resolves the contradiction by providing both strong adhesion and high seizure resistance under high-load sliding conditions
Solution Approach 2:
The invention creates a composite intermediate layer combining Ti and TiC phases with optimized carbon content. This composite structure leverages the beneficial properties of both materials: Ti provides strong bonding to the base material, while TiC provides high hardness and low friction, resulting in an intermediate layer that simultaneously achieves adhesion and seizure resistance
2Temperature
If conventional PVD method is used to form intermediate layer at low temperature, then base material is protected from thermal damage, but seizure resistance under high load is insufficient
Solution Approach 1:
The invention changes the compositional parameters of the intermediate layer by controlling the carbon content to be 53 at% or more and 77 at% or less. This parameter optimization transforms the intermediate layer from a conventional Ti/TiC structure to a carbon-enriched TiC-dominated layer, which resolves the contradiction by providing both strong adhesion and high seizure resistance under high-load sliding conditions
Solution Approach 2:
The invention creates a composite intermediate layer combining Ti and TiC phases with optimized carbon content. This composite structure leverages the beneficial properties of both materials: Ti provides strong bonding to the base material, while TiC provides high hardness and low friction, resulting in an intermediate layer that simultaneously achieves adhesion and seizure resistance
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 solution effectively suppresses peeling at the interface during high-load sliding and improves the seizure resistance of the DLC film-coated member by maintaining optimal carbon content and layer structure, ensuring stable adhesion between the base material and the DLC layer.
Implementation Method 1
a film-forming method of an intermediate layer formed between a base material and a DLC layer by using a sputtering method
Implementation Method 2
an argon gas and an acetylene gas are supplied into a chamber into which the base material is carried
Data Source
AI summary
In an intermediate layer formed between a base material and a DLC layer, a Ti layer and a TiC layer formed on a surface of the Ti layer are provided, and a carbon content of the entire layer containing the Ti layer and the TiC layer is 53 at % or more and 77 at % or less.