4 research outputs found
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Topology Driven Improvement of FDC Build Parameters
The likeliest failure origin for advanced ceramics parts, prepared by fused
deposition, is a void from improper fill. Adequate filling of each cross-section is dependent upon the deposition toolpath. Cross-sectional spaces are conventionally
filled with pre-defined parameters. We propose that adaptive build parameters will
control variations in geometry and property of a part. Voids, overfilling,
incomplete bonding and excess traversing can be suppressed by adjusting the fill
parameters for cross-sectional areas. Improved build parameters and toolpath
allows for faster build time and components ofj full density. Some implementations
are discussed and presented.Mechanical Engineerin
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Shrinkage and Deformation in Components Manufactured by Fused Deposition of Ceramics
Fused Deposition of Ceramics (FDC) presents a new processing technique that may contribute
to anisotropic shrinkage and deformation, which are critical issues in the manufacture of
ceramic components. The aim ofthis study is to identify and quantify key FDC parameters and
their influence on shrinkage and deformation. The study was divided into two focus areas. The
first was the effect ofthe FDC build parameters on the shrinkage of ceramic parts. The second
focused on the interaction of the FDC build process with the geometrical features of a part. A
series of experimental design techniques have been implemented in order to gain a thorough
understanding of said parameters, as well as any possible interactions between parameters
Studies have been conducted across each processing step, from the green manufacture of the
part, through binder removal, and sintering. The data and knowledge gained from these
experiments will allow us to redesign the original CAD component files to compensate for the
shrinkage and deformation encountered when using the FDC techniqueMechanical Engineerin
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Gelcast Molding with Rapid Prototyped Fugitive Molds
A technique for the rapid manufacture ofceramic components has been developed
using rapid prototyping to generate molds for the required components. The process
entails the fabrication offugitive tooling using rapid prototyping techniques from which
ceramic articles are formed using gelcasting. In the gelcasting process, the mold cavities
are filled with a fluid suspension of ceramic powder which sets to a solid form through
the polymerization of gelling additives and application of heat. The mold is carefully
removed by dissolution or heat treatment leaving the intact gelcast part. The "green"
gelcast part is subsequently dried and sintered to full density. Computer aided
manufacturing of the tooling using solid freeform fabrication techniques allows for
complex shapes to be manufactured with minimal tooling cost. The technique is idealfor
the manufacture of ceramic parts in small batch conditions or for prototyping of
functional parts in design cycles. Cost and time reduction of a magnitude can be
achieved.Mechanical Engineerin