Spraying method of supersonic plasma
Title：
Spraying method of supersonic plasma
Application Number：
 200410008468
Application Date：
 2004/03/12
Announcement Date：
 2005/01/05
Pub. Date：
 2006/06/07
Publication Number：
 1560316
Announcement Number：
 1258614
Grant Date：
 2006-6-7
Granted Pub. Date：
 2006-6-7
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 C23C 4/00
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Wu Minsheng, Li Luming, Zhang Huatang
Key Words：
 Spraying method, supersonic plasma
Abstract：
 The invention is an ultrasonic plasma-spraying method, for controlling coating porosity and improving coating binding strength, including the steps: connecting an ultrasonic excitation source in parallel with the anode and cathode of the spray gun of a plasma-spraying device; electrically isolating the excitation source from the DC power supply of plasma spraying; starting a water circuit and an electric circuit of the plasma-spraying device to make high-frequency arc starting, and cooling the spray gun; turning on the excitation source to make ultrasonic alternative signal couple with plasma arc exciting signal so as to generate ultrasonic; starting a powder-feed system in the plasma-spraying device and as passing through high-temperature plasma arc, the sprayed powder is heated, and the ultrasonic acts on the plasma and simultaneously on melting sprayed powder; under the action of high-temperature plasma flame, the molten powder reaches a workpiece surface, disperses and solidifies into a coating.
Claim：
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PCT：
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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
2008-3-31
  Selected patents owned by Tsinghua University filed in 2006 and 2007 are load.







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