Tribological Performance of High-Entropy Coatings (HECs): A Review

Area of Science:

• Materials Science
• Surface Engineering
• Tribology

Background:

• High-entropy coatings (HECs) are advanced materials with five or more principal elements, offering enhanced mechanical and tribological properties.
• These coatings exhibit simple solid solution phases (BCC, FCC) instead of brittle intermetallics, improving component performance.
• HECs are increasingly vital for applications requiring high-temperature compatibility and wear resistance.

Purpose of the Study:

• To review and synthesize existing research on high-entropy coatings (HECs).
• To critically assess fabrication methods, microstructural characteristics, and tribological behavior of HECs.
• To highlight the potential of HECs for demanding industrial applications.

Main Methods:

• Comprehensive literature review of studies on high-entropy coatings.
• Analysis of various synthesis techniques for HECs and their targets/feedstock.
• Evaluation of microstructural and tribological data from room temperature to elevated temperatures.

Main Results:

• HECs demonstrate excellent mechanical and tribological properties, particularly at high temperatures.
• Diverse fabrication routes and synthesis methods are employed for HECs.
• Understanding of HEC behavior is advancing, showing promise for industrial use.

Conclusions:

• High-entropy coatings are a rapidly developing field with significant potential for high-temperature applications.
• Further research into fabrication and characterization will enhance HEC performance.
• HECs offer a promising solution for improving component durability and efficiency in critical service conditions.