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| Abstract No.: |
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Scheduled at:
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Thursday, September 29, 2011, Saal B2.1 3:15 PM
Plasma Spraying 2
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| Title: |
The characteristic of plasma torch designed for very low pressure plasma spraying
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| Authors: |
Yang Gao* / thermal spray center of Dalian maritime university, China
D-M Yang / thermal spray center of Dalian maritime university, China
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| Abstract: |
In contrast with atmosphere plasma spraying (APS), very low pressure plasma spraying (VLPPS) shows lower ability for heating spray materials. Most very low pressure plasma spraying at the present usually use a high energy plasma gun operated at great arc currents over 2000A to meet lower ability for heating materials, thus result in a series of problems not only for the plasma torch but also for associated facility. According to the plasma spray characteristic in the low pressure environment we designed a plasma torch with specific nozzle and the powder injected to the plasma jets is from inside nozzle intake. In this study, the pressures in the plasma gases intake, nozzle intake and out of plasma torch were measured respectively. For the practice, SUS 316 stainless steel coatings were prepared at plasma currents of 500-600A and arc voltage of 50V at chamber pressure of 50 mbar, the results indicated that the coatings with equiaxed microstructure could deposited in the appropriate conditions.
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