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research-article

Characterizing Binder-powder Interaction in Binder Jetting Additive Manufacturing via Sessile Drop Goniometry

[+] Author and Article Information
Yun Bai

DREAMS Lab, Department of Mechanical Engineering, Virginia Tech
yunbai@vt.edu

Candace Wall

Department of Chemistry, Virginia Tech
Cwall88@vt.edu

Hannah Pham

Department of Materials Science and Engineering, Virginia Tech
hannahbp@vt.edu

Alan Esker

Department of Chemistry, Virginia Tech
aesker@vt.edu

Christopher Williams

DREAMS Lab, Department of Mechanical Engineering, Virginia Tech
cbwill@vt.edu

1Corresponding author.

ASME doi:10.1115/1.4041624 History: Received April 21, 2018; Revised September 26, 2018

Abstract

Understanding the binder-powder interaction and primitive formation is critical to advancing the binder jetting Additive Manufacturing process and improving the printing accuracy, precision, and mechanical properties of printed parts. In this work, the authors propose an experimental approach based on sessile drop goniometry on a powder substrate to characterize the powder granulation process. In this experiment, the dynamic contact angle in capillary pores is calculated based on the measured binder penetration time, and the binder penetration depth and width is measured directly from the powder granules retrieved from the powder substrate. Coupled with models of capillary flow, the technique can provide a fundamental understanding of the binder-powder interactions that determine material compatibility and can also be used to predict printing parameters. Enabled by this gained understanding, the effects of solid loadings in nanoparticle suspensions on their interactions with differently sized powder substrates (i.e., different powder bed porosity) was investigated.

Copyright (c) 2018 by ASME
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