Applying diamond-like carbon (DLC) coating involves several critical steps to ensure the coating's effectiveness and durability.
4 Key Steps to Enhance Durability
1. Selection of Base Material
The base material for DLC coating can be categorized into three types: strong carbide forming materials, strongly soluble carbon materials, and materials that neither react with nor dissolve carbon.
Commonly used base materials include cemented carbide (WC-Co), silicon (Si), stainless steel, high-speed steel, and molybdenum (Mo).
2. Preprocessing Technology
The adhesion between the DLC film and the substrate is crucial.
Preprocessing methods such as abrasive grinding and chemical corrosion are employed to enhance this adhesion.
For instance, ultrasonic grinding with nanoscale diamond powder can increase the nucleation density, improving the film-substrate adhesion.
Chemical corrosion methods like the alcohol-alkali two-step method are also effective, particularly for complex-shaped substrates, as they improve efficiency and safety compared to traditional strong acid corrosion methods.
3. Deposition Process
DLC coatings can be applied using techniques such as Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD).
PVD involves evaporating a source material and allowing it to condense onto the tool, forming a thin DLC layer.
CVD, on the other hand, decomposes a gaseous precursor in a film growth zone, typically using heat or plasma to facilitate the decomposition on the substrate.
CVD can also involve the use of a buffer layer like TiC to improve the adhesion and properties of the diamond film on certain substrates like titanium.
4. Ensuring Effective Application
These steps ensure that the DLC coating is effectively applied, providing excellent wear and chemical resistance.
This is particularly beneficial for applications requiring high specific strength and wear resistance, such as automobile pistons, VCR heads, and textile machinery components.
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