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Laser Micromachining for Polymer Surface Topography Design

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Laser Structuring and DLC Coating of Elastomers for High Performance Applications.

Sönke Vogel¹, Andreas Brenner², Bernadette Schlüter³

¹Chair for Laser Technology LLT, RWTH Aachen University, 52074 Aachen, Germany.

Materials (Basel, Switzerland)

|May 20, 2022

Summary

Laser-patterned diamond-like carbon (DLC) coatings on rubber seals prevent fracture and delamination. This nature-inspired approach enhances coating resilience and longevity by relieving stress through tile patterns.

Keywords:

DLC coating delamination diamond like carbon flexible friction nature inspired rubber sealing tribology

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Area of Science:

Materials Science
Surface Engineering
Tribology

Background:

Hard, low-friction coatings like diamond-like carbon (DLC) improve rubber seal performance and lifespan.
A key challenge is the elastic mismatch between rubber substrates and DLC coatings, leading to coating fracture and delamination.

Purpose of the Study:

To develop a fracture-free application method for DLC coatings on rubber seals.
To enhance the flexibility and delamination resistance of DLC coatings using a nature-inspired patterning technique.

Main Methods:

Rubber substrates were laser-structured with tile patterns.
Diamond-like carbon (DLC) coatings were applied to both structured and unstructured rubber samples.
Tensile and tribology tests were conducted to evaluate coating performance under stress and friction.

Main Results:

Unstructured DLC coatings exhibited cracking during the coating process and further fragmentation under tensile stress.
DLC coatings on tile-patterned rubber substrates showed no further fragmentation under load.
Tile-structured samples displayed less heterogeneous damage during continuous tribological loading.

Conclusions:

Laser-induced tile patterning effectively relieves stress in DLC coatings on rubber.
This approach significantly enhances the resilience and delamination resistance of DLC coatings.
The findings offer a promising strategy for durable, low-friction coatings on elastic substrates.