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| [[Homework 1: 1980-1990 Patent]] | | [[Homework 1: 1980-1990 Patent]] |
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| == '''Patent 4788402: HIGH POWER EXTENDED ARC PLASMA SPRAY METHOD AND APPARATUS''' ==
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| '''Patent Date: November 29, 1988'''
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| '''Inventor: James A. Browning'''
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| [[File:Fig2.jpg]]
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| Figure 2a shows a longitudinal view of the apparatus, while Figure 2b shows a cross-sectional view taken about the line 2b-2b.
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| ''Basic Description:''
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| This apparatus is used to apply metal or ceramic coatings to surfaces. The device functions as follows:
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| An electric arc is created [37], emanating from the cathode electrode [32]. Gas is pumped from the gas supply tube [26] into the annular chamber [41], surrounding the cathode electrode [32] and flowing out of the exit nozzle [34 & 34a]. The conical reduction section [35] helps to create a vortex flow for the gas, giving it a higher velocity as it exits the nozzle [34a]. The interaction between the gas and the arc ionizes the gas, creating the plasma, and this plasma atomizes the powder entering the nozzle [27 & 27'] and deposits it on the surface of the workpiece via the plasma flame jet [38], creating the surface coating.
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| This device is largely an innovation on existing technology, based largely on the increased velocity and voltage.
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| This device can also create coatings using wire or thin, flat strips instead of powder, owing to the increase in velocity that allows for the atomization of these materials.
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Revision as of 19:50, 26 January 2011
