Structure, Mechanical, and Micro-Scratch Behavior of Ta-Hf-C Solid Solution Coating Deposited by Non-Reactive...

Area of Science:

• Materials Science
• Surface Engineering
• Thin Film Technology

Background:

• Tantalum carbide (TaC) and hafnium carbide (HfC) are known for their refractory properties.
• Developing advanced coatings with superior mechanical properties is crucial for demanding applications.

Purpose of the Study:

• To prepare Hf-Ta-C coatings via non-reactive DC magnetron sputtering.
• To investigate the influence of deposition parameters on Hf-Ta-C coating properties.
• To evaluate the scratch performance and potential applications of Hf-Ta-C coatings.

Main Methods:

• Non-reactive DC magnetron sputtering was employed for coating preparation.
• Analysis of working pressure and deposition temperature effects on structure and mechanics.
• Scratch testing was performed on coatings deposited on stainless steel and tungsten substrates.

Main Results:

• Hf-Ta-C solid solution coatings achieved hardness of 37.8 ± 1.1 GPa and elastic modulus of 435.8 ± 13.8 GPa.
• Plastic deformation resistance (H³/E²) reached 0.285, exceeding binary coatings by over 100%.
• Coatings showed weaker plastic resistance on soft substrates but exhibited low friction (0.01) on hard substrates.

Conclusions:

• Solid solution strengthening significantly enhances the mechanical properties of Hf-Ta-C coatings.
• Hf-Ta-C coatings demonstrate excellent potential as protective layers for cutting tools.
• The performance characteristics suggest suitability for high-wear environments.