Improving the Dimensional Accuracy of Binder Jet Printed Parts by Using a Material Infiltration Method

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2018-10-18

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Improving the dimensional accuracy of binder jet printed parts by using a material infiltration method, Magdi Alameen1, Lynnora Grant2, and Zachary Cordero2, 1R-STEM Research Experience for Community College Student, Rice University,, Houston, TX, 2Additive Lab, Department of Materials Science and NanoEngineering, Rice University, Houston, TX, There is a growing interest in additive manufacturing, also known as 3D printing, because it enables users to print complex and highly customized objects. Three common types of 3D printing technology are binder jet printing, selective laser melting, and electron beam melting. The binder jet process produces porous parts that must be densified with the sintering step to increase their strength. However, during sintering the geometrical structure of the printed parts often changes because of material creep. In this work, we aim to increase the dimensional accuracy in the sintering step to make printed parts more suitable for applications demanding precise geometries. We do this using an oxide precursor. The oxide precursor decomposes at temperatures above 100°C to produce titanium dioxide (TiO2) nanoparticles. These nanoparticles diffuse at lower temperature than TiO2 microparticles, reinforcing the bonds between powder. Beams with no precursor application broke down during sintering after the binder burnout around 400-500°C. This project was completed with contributions from Zachary C. Cordero from the Department of Materials Science and NanoEngineering, Rice University.

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