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| Abstract No.: |
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Scheduled at:
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Wednesday, May 11, 2016, Room 3E 4:00 PM
Suspension Spraying III
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| Title: |
Opportunities of twin-cathode system as new suspension plasma spray system
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| Authors: |
Mohammed Shahien* / National Institute of Advanced Industrial Science and Technology, Japan
Masato Suzuki/ National Institute of Advanced Industrial Science and Technology, AIST, Japan
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| Abstract: |
Using the nano-size particles in the form of suspension or precursor is the possible way to use the fine particles in thermal spray technology. Using the nano-size particles had the unique advantages of the formation of fine droplets, fine splats and therefore the precise control of the coating microstructure. These novel features make the Suspension/Solution-Precursor Plasma Spraying (SPS/SPPS) as promising solution for several applications and research challenges.
Recently we developed new suspension plasma spraying system with an axial feeding and low cost. The system is based on using twin-cathode plasma spray gun with three plasma torches. The main torch is in the center with reversed polarity (cathode nozzle and anode), and two sub-torches with normal polarity (anode nozzle and cathode) on the sides. The electric power is supplied between the anode of main torch and the 2 sub-torches cathodes to maintain the plasma jet. This system is based on the axial feeding of the suspension, through the hollowed anode of the main torch and the commercial dual tube nozzle was used for axial feeding. Furthermore, it is cost reduction system. Thus, the system requires only argon as plasma gas, since the enthalpy of plasma jet is high enough for melting the oxide ceramic powders. This paper will show the opportunities and challenges of this twin-cathode plasma system as new suspension plasma spray system.
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