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SLM of net-shaped high strength ceramics

New opportunities for producing dental restorations
: Hagedorn, Y.-C.; Balachandran, N.; Meiners, W.; Wissenbach, K.; Poprawet, R.

Bourell, D.L. ; University of Texas -UT-, Austin/Tex.:
Solid freeform fabrication proceedings : An additive manufacturing conference. Proceedings of the SFF Symposium held at Austin, Texas on August 8 - 10, 2011
Austin, Tex.: University of Texas, 2011
Solid Freeform Fabrication Symposium (SFF) <22, 2011, Austin/Tex.>
Fraunhofer ILT ()

Oxide ceramics yield excellent mechanical properties along with outstanding thermal and wear resistance. However, little work on additive Manufacturing (AM) of high-strength ceramics has been stated. In the present paper the current state of development in Selective Laser Melting (SLM) of pure ceramic specimens is reviewed. During the present approach the eutectic mixture of pure alumina (AhO3) and zirconia (ZrO2) powder is completely molten while crack formation is prevented by a high-temperature CO2-I aser preheating. This approach yields net-shaped, fully dense specimens reaching flexural strengths of above 500 MPa without post-processing. One potential application for this technology are fully-ceramic dental restorations frameworks, as the demanded maximum loads of above 1000 N are met. Alternative preheating strategies are presented to allow for manufacturing larger volumetric parts.