Nanoindentation and scratch studies on magnetron sputtered Ti thin films

Area of Science:

• Materials Science
• Surface Engineering
• Mechanical Engineering

Background:

• Titanium (Ti) thin films are utilized for surface protection due to their properties.
• Understanding the mechanical behavior of Ti films on steel substrates is essential for optimizing performance.
• Previous studies have explored Ti film deposition but detailed mechanical analysis under varied conditions is ongoing.

Purpose of the Study:

• To investigate the mechanical properties of Ti thin films deposited on D9 steel.
• To evaluate the influence of substrate deposition temperature on film hardness and adhesion.
• To assess the performance of Ti coatings under static and sliding contact conditions.

Main Methods:

• Sputter deposition of Ti thin films on D9 steel at different substrate temperatures.
• Nanoindentation tests to measure film hardness.
• Scratch tests to evaluate adhesion strength and critical load to failure.

Main Results:

• The hardness of the Ti films was measured to be 2.5 GPa, irrespective of deposition temperature.
• Scratch tests revealed superior adhesion strength for Ti films deposited at a substrate temperature of 200°C.
• The critical load to failure for these superior adhesion coatings was determined to be 2 N.

Conclusions:

• Substrate temperature significantly impacts the adhesion of sputter-deposited Ti films on D9 steel.
• Ti films deposited at 200°C exhibit enhanced mechanical integrity and adhesion, suitable for demanding applications.
• The findings provide valuable data for the application of Ti coatings in wear-resistant scenarios.