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Lithography-based Metal Manufacturing (LMM) Of 316L Powder

  • : Gerald Mitteramskogler1, Martin Schwentenwein1, Carlo Burkhardt2
  • : 1Lithoz GmbH, 2Pforzheim University of Applied Sciences
  • : PDF Download
  • : 2018

Abstract

A vat polymerization-based additive manufacturing processes called Lithography-based Metal Manufacturing (LMM) has been developed for the manufacturing of metallic green parts. A photoreactive metal-filled feedstock with a solids loading of up to 50 vol% is selectively cured by exposure to light. After the layer-by-layer printing process the green parts require an additional thermal treatment to gain their final metallic properties. This thermal treatment—similar to the thermal treatment used for Metal Injection Molding (MIM)—eliminates polymer binder and is referred to as debinding. As a last step the debound structure can be sintered up to 98.5 % of the theoretical density of 316L. Using the LMM process highly complex parts could be manufactured showing a good geometrical accuracy and very low surface roughness. Also the mechanical properties of the AM structure are comparable to conventionally manufactured 316L.

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