A Novel Single Cathode Plasma Column Design for Process Stability and Long Component Life

作者：Mohanty P S^*; George A; Pollard L; Snyder D

来源：Journal of Thermal Spray Technology, 2010, 19(1-2): 448-458.

DOI：10.1007/s11666-009-9449-4

• arc fluctuation
• diagnostics
• plasma column design

This paper investigates a novel single cathode plasma column design consisting of a patented arc constrictor and its impact on process stability, versatility, and component life. The design aims to minimize the re-strike of arc, increase the arc length enabling high voltage and low amp operation as well as the use of ternary gas combination to increase the enthalpy. The arc unsteadiness and dynamic behavior are investigated through the fluctuations of electrical signals. Further, the particle velocity and temperature have been characterized by commercial diagnostics systems. The takeover/steady mode appears to be the typical operational mode of the plasma jet in this design. Low amplitude and high frequency fluctuations resulted in steady particle characteristics. Further, the design allowed the gun to operate at very high plasma velocities reaching the characteristics of an HVOF jet. The significance of the design is demonstrated through operational flexibility and stability.

• 出版日期2010-1