Title

Wet Processing of Granular Nickel for On-Demand Extrusion

Presenter Information

Nicholas Timme

Department

Materials Science and Engineering

Major

Ceramic Engineering

Research Advisor

Hilmas, Greg

Advisor's Department

Materials Science and Engineering

Funding Source

Honeywell

Abstract

On-demand extrusion is a direct-write additive manufacturing process in which paste is extruded through fine nozzles to produce a geometry, layer by layer, using a 3D gantry system. A manufactured paste is suitable for printing if it has an appropriate low shear viscosity, shear thinning behavior, and the particles are properly dispersed. This allows for easy extrusion and prevents agglomeration while maintaining shape retention after extrusion. While suitable nickel pastes for printing have been found, the characterization of nickel during the paste production process and optimization of paste formulation has not been explored. This study examined how the ball milling of granular nickel powder modifies the oxygen content, particle size distribution, and surface area of the starting powder. The effectiveness of ionic and nonionic dispersants were evaluated with rheology for different milling times. Preferred nickel milling times and dispersants were determined and used to make pastes for on-demand extrusion.

Biography

Nick Timme is a junior majoring in Ceramic Engineering from St. Charles, MO. His research involves the processing of nickel for additive manufacturing. He is on the executive board of Material Advantage as the Historian and is a general member of the Keramos Honors Fraternity. This is Nick's first research project, but he hopes to pursue more in the coming semesters.

Research Category

Engineering

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium

Presentation Date

16 Apr 2019, 9:00 am - 3:00 pm

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Apr 16th, 9:00 AM Apr 16th, 3:00 PM

Wet Processing of Granular Nickel for On-Demand Extrusion

Upper Atrium

On-demand extrusion is a direct-write additive manufacturing process in which paste is extruded through fine nozzles to produce a geometry, layer by layer, using a 3D gantry system. A manufactured paste is suitable for printing if it has an appropriate low shear viscosity, shear thinning behavior, and the particles are properly dispersed. This allows for easy extrusion and prevents agglomeration while maintaining shape retention after extrusion. While suitable nickel pastes for printing have been found, the characterization of nickel during the paste production process and optimization of paste formulation has not been explored. This study examined how the ball milling of granular nickel powder modifies the oxygen content, particle size distribution, and surface area of the starting powder. The effectiveness of ionic and nonionic dispersants were evaluated with rheology for different milling times. Preferred nickel milling times and dispersants were determined and used to make pastes for on-demand extrusion.