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Probing ink-powder interactions during 3D binderjet printing using time resolved x-ray imaging

DOI: 10.1021/acsami.0c03572 DOI Help

Authors: Srimanta Barui (University of Manchester; Indian Institute of Science) , Hui Ding (University of Manchester) , Zixin Wang (University of Manchester) , Hu Zhao (University of Manchester) , Shashidhara Marathe (Diamond Light Source) , Wajira Mirihanage (University of Manchester) , Bikramjit Basu (Indian Institute of Science) , Brian Derby (University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Materials & Interfaces

State: Published (Approved)
Published: June 2020
Diamond Proposal Number(s): 19533

Abstract: Capillary driven ink infiltration through a porous powder bed in 3D binderjet printing (inkjet printing onto a powder bed) controls the printing resolution and as-printed ‘green’ strength of the resulting object. However, a full understanding of the factors controlling the kinetics of the infiltration remains incomplete. Here, high resolution in situ synchrotron radiography provides time resolved imaging of the penetration of an aqueous solution of eythylene glycol through a porous alumina powder bed, used as a model system. A static drop-on-demand inkjet printer was used to dispense liquid droplets onto a powder surface. The subsequent migration of the liquid front and its interactions with powder particles was tracked using fast synchrotron X-radiography in the Diamond Synchrotron, with phase contrast imaging at a frame rate of 500 Hz. Image processing and analysis reveal both the time dependent increment in the wetting area and the propagation of the ‘interface leading edge’ exhibit heterogeneous behavior in both the temporal and spatial domain. However, mean infiltration kinetics are shown to be consistent with existing infiltration models based on the Washburn equation modified to account for the spreading of the liquid drop on the powder surface and using a modified term for the bed porosity.

Journal Keywords: Inkjet printing; ink-powder interaction; capillary infiltration; Washburn model; X-radiography; synchrotron in situ imaging

Diamond Keywords: Additive Manufacturing

Subject Areas: Materials

Instruments: I13-2-Diamond Manchester Imaging

Added On: 29/06/2020 10:19

Discipline Tags:

Materials Science

Technical Tags:

Imaging Tomography