Finishing might be required to smoothen surfaces, reduce surface roughness, clean internal channels or remove the partially melted powder. A variety of post-processes can help reduce the surface roughness of additive manufactured parts. Some techniques involve mechanical action (such as shot peening, tumbling and media blasting), whilst others involve the combination of both chemical and mechanical action (such as electro-polishing). Each method must be evaluated based on how well it works, how much material is removed, cost as well as the level of finish required.
Media Blasting is a surface treatment that forcibly propels a high-pressure stream of ceramic material against the surface of the part to smooth it.
The process provides a satin, uniform matte finish with approximately 2,5÷6,0μm Ra.
Vibro finishing can generate smoother exterior surfaces. This is a wet process that involves ceramic materials submersed in a surfactant compound. The process results in surface roughness between 0,8÷3,2μm Ra.