Effects of Anode Arc Root Fluctuation on Coating Quality During Plasma Spraying |
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Authors: | Lian-tong An Yang Gao Chengqi Sun |
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Affiliation: | (1) Navigation College, Guangdong Ocean University, Zhanjiang, 524025, People’s Republic of China;(2) Transportation & Logistics Engineering College, Dalian Maritime University, Dalian, 116026, People’s Republic of China |
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Abstract: | To obtain a coating of high quality, a new type of plasma torch was designed and constructed to increase the stability of
the plasma arc and reduce the air entrainment into the plasma jet. The torch, called bi-anode torch, generates an elongated
arc with comparatively high arc voltage and low arc fluctuation. Spraying experiments were carried out to compare the quality
of coatings deposited by a conventional torch and a bi-anode torch. Alumina coatings and tungsten carbide coatings were prepared
to appraise the heating of the sprayed particles in the plasma jets and the entrainment of the surrounding air into the plasma
jets, respectively. The results show that anode arc root fluctuation has only a small effect on the melting rate of alumina
particles. On the other hand, reduced air entrainment into the plasma jet of the bi-anode torch will drastically reduce the
decarbonization of tungsten carbide coatings. |
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Keywords: | |
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