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Department of Mechanical and Industrial Engineering >
Master of Engineering (M.Eng.) project reports >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25817

Title: Focusing of Maskless Abrasive Jets
Authors: Wodoslawsky, Andrew
Advisor: Spelt, Jan K.
Papini, Marcello
Keywords: micro
abrasive
jet
Issue Date: 11-Jan-2011
Abstract: Abrasive jets offer an economical alternative to benchmark micromachining technologies, but there is a need to develop a technique to focus abrasive air jets so that a mask (stencil) is not needed to achieve the required resolution. The poor resolution of maskless air jets is likely the result of internal nozzle roughness. By extrapolating from the literature, it was concluded that aerodynamic lenses and converging capillary focusing methods cannot be expected to be effective because the particles used in abrasive jetting are too large and the flows too turbulent. Focusing using eddy-current repulsion, electrostatic repulsion and diamagnetic repulsion were not deemed to be promising because none of the technologies examined could generate, under practical configurations, the required magnitude of force. Therefore, no technique for reliably focusing an abrasive jet was found. Since abrasive water jets have been shown to operate with very small divergence, a prototype abrasive suspension jet was designed, built and put through basic tests of functionality. The jet was easily capable of etching borosilicate glass with a driving (air) pressure of 6MPa and 12MPa, with apparently small dispersion. However, the mixing mechanism did not achieve a homogeneous concentration of abrasive during jetting, so was not capable of etching prismatic channels. Design improvements and future experiments were suggested.
URI: http://hdl.handle.net/1807/25817
Appears in Collections:Master of Engineering (M.Eng.) project reports

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