Atmospheric pressure plasma etching of Ti-6Al-4 V using SF₆ etchant.

Area of Science:

• Materials Science
• Surface Engineering
• Plasma Physics

Background:

• Atmospheric pressure plasma (APP) etching is established for silicon-based materials.
• Limited research exists on APP etching for non-silicon-based materials.
• Ti-6Al-4V alloy is crucial in aerospace and biomedical fields but difficult to machine.

Purpose of the Study:

• To develop an APP etching process for Ti-6Al-4V.
• To evaluate material removal rates and surface integrity.
• To understand the etching mechanism.

Main Methods:

• Utilized SF6 in an atmospheric pressure plasma system.
• Etched Ti-6Al-4V metal alloy samples.
• Analyzed material removal rates and surface characteristics.

Main Results:

• Achieved material removal rates of 0.5–2 mm³ min⁻¹.
• Demonstrated effective material removal with minimal surface damage.
• Proposed a mechanism involving volatile VFx and TiF4 formation.

Conclusions:

• APP etching is a viable technique for Ti-6Al-4V surface finishing.
• This method is particularly suitable for large and complex shapes.
• Offers an alternative to slow and damaging conventional machining methods.