Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 12, Pages 19701-19707Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.04.098
Keywords
Ceramics; Binder jetting; Additive manufacturing; Bimodal powder; Linear packing model
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Funding
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office Award [34240, DE-AC02-06CH11357]
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A limitation of binder jetting additive manufacturing is the low density of fabricated parts. Mixing powders with different sizes is a promising approach to increase powder bed packing density and, hence, printed part density. However, in previous studies mixed powder feedstock was prepared by trial and error method. In this research, both modeling and experimental methods were used to prepare the bimodal powder feedstocks. Analytical packing model was introduced for irregular powders. A bimodal powder was prepared by mixing two different-sized silicon carbide powders (i.e. coarse and fine) using ball mill, and their tap densities were measured. Silicon carbide plates were printed using the coarse and bimodal powders by a commercial binder jetting system. Results showed that the modeling method could predict the tap density of bimodal powders with high accuracy. The printed parts from bimodal powder achieved higher green densities than those from the unimodal powder.
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