8/10/2016

AM Conference Speaker: ExOne

ExOne uses liquid phase sintering to increase the density of 3D-printed, high-performance alloy parts made using powder-bed binder jetting. Learn more during a presentation at the Additive Manufacturing Conference in September.

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According to ExOne, powder-bed binder jetting offers a cost-effective method for 3D printing complex shapes in high-performance alloys. However, the resulting part consists of only 60 volume percent metal powder. To tackle this problem, ExOne uses liquid phase sintering to heat the part to a temperature slightly above the melting point of the alloy. This process enables liquid to form along the grain boundaries in each alloy particle, which promotes sliding and rearrangement of the grains to fill in the space between powder particles. The company uses the combined printing and thermal process to form complex shapes in 316L stainless steel, Inconel 625 and Hastelloy 282, resulting in a density in excess of 97 percent with properties approximating those of the alloys in cast form. According to ExOne, hot isostatic pressing (HIPping) enables the parts to reach full density and greater mechanical properties.

Rick Lucas, chief technology officer, will discuss ExOne’s process development, resulting properties, and applications in energy, thermo-fluid handling and aerospace during the upcoming Additive Manufacturing Conference, co-located with IMTS 2016, at 4 p.m. on Tuesday, September 13, in room W375-B.

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