Recoating system for using high viscosity build materials in solid freeform fabrication
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United States of America Patent
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Dec 2, 2003
Issued Date -
N/A
app pub date -
Jan 17, 2002
filing date -
Jun 22, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of applying highly viscous paste-like build materials in layers in a solid freeform fabrication apparatus to form three-dimensional objects. A viscosity modifier is first introduced into the build material to establish a low viscosity state and then the material is dispensed in layers on a working surface. The viscosity modifier is then removed from the build material preferably by evaporation, and the layer is selectively solidified to form the three-dimensional object. The method substantially eliminates the undesirable effects of induced shear stress imposed on lower layers when attempting to apply uniform layers of highly viscous materials in solid freeform fabrication techniques. The method allows for the use of highly viscous paste-like materials that can include upwards of 50% by weight of metallic, ceramic, mineral, or polymer powders. Preferably the binder is a photocurable resin or thermocurable material which is selectively solidified to form the three-dimensional objects.
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