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Full-Text Articles in Engineering
Freeze-Form Extrusion Fabrication Of Boron Carbide, Aaron Scott Thornton
Freeze-Form Extrusion Fabrication Of Boron Carbide, Aaron Scott Thornton
Masters Theses
"Boron carbide is a safe, alternative to beryllium as a material for aerospace structures since it is also light-weight and exhibits high strength. This paper discusses a study of the Freeze-form Extrusion Fabrication (FEF) process to fabricate parts from boron carbide. Process parameters and hardware were modified to fabricate boron carbide specimens free of printed defects. Four-point bending tests were performed to measure the flexural strength of fabricated specimens. Observations of the presence of voids caused by ice crystals in fabricated parts led to further development and characterization of the boron carbide paste used with the FEF process. Additives were …
Performance Metrics For Powder Feeder Systems In Additive Manufacturing, Venkata Sivaram Bitragunta
Performance Metrics For Powder Feeder Systems In Additive Manufacturing, Venkata Sivaram Bitragunta
Masters Theses
"In blown powder Direct Metal Deposition (DMD) process, parts are built by adding metal powder on the melt pool created by the laser system. At low feed rates powder feeder systems have perturbations. The study focused on relationship between the perturbation frequencies by inherent powder feeder designs and its impact on deposition quality. Performance metric determine the relation between perturbations in the powder flow and quality of the deposit. To determine performance metric, various powder feeder designs were analyzed. Perturbation frequencies were introduced to the disk feeder design. The quality of the deposit was determined by the surface roughness of …