TY - JOUR
T1 - Effect of critical plasma spray parameter on properties of hollow cathode plasma sprayed alumina coatings
AU - Yugeswaran, S.
AU - Selvarajan, V.
AU - Seo, D.
AU - Ogawa, K.
N1 - Funding Information:
The present study was supported by a grant from the Department of Science and Technology (DST), Government of India under category of Technology Systems. Authors would like to thank Mr. Janarthanan Nair (Ion Arc Technologies Pvt. Ltd., India) for developing the torch facilities. One of the authors (S.Y) acknowledges the Junior Research Fellowship awarded by DST, Government of India.
PY - 2008/11/25
Y1 - 2008/11/25
N2 - A 20 kW hollow cathode plasma spray torch was manufactured and its performances were examined by spraying alumina coatings on mild steel substrates with different critical plasma spray parameters (CPSP: 0.12, 0.24, 0.36, 0.48). CPSP is defined as the ratio between the torch input power and primary plasma forming gas flow rate. The effects of CPSP on the microstructure, porosity, microhardness, surface roughness, sliding wear and erosive wear properties of the coatings were investigated. The electrothermal efficiency and the excitation temperature of the plasma jet were also investigated for different CPSP. The microstructure and phase composition of the alumina coatings were examined using scanning electron microscope and X-ray diffraction (XRD) analysis respectively. XRD analysis revealed that alumina particles during plasma spraying reach sufficient melting state prior to the impact on the substrate with a velocity comparable to that of conventional plasma spraying. The experimental results have shown that the CPSP has significant influence on the microstructure and other properties of the deposited alumina coating. It also showed that the hollow cathode plasma spray torch is a suitable tool to coat the dense ceramic materials with low input power levels.
AB - A 20 kW hollow cathode plasma spray torch was manufactured and its performances were examined by spraying alumina coatings on mild steel substrates with different critical plasma spray parameters (CPSP: 0.12, 0.24, 0.36, 0.48). CPSP is defined as the ratio between the torch input power and primary plasma forming gas flow rate. The effects of CPSP on the microstructure, porosity, microhardness, surface roughness, sliding wear and erosive wear properties of the coatings were investigated. The electrothermal efficiency and the excitation temperature of the plasma jet were also investigated for different CPSP. The microstructure and phase composition of the alumina coatings were examined using scanning electron microscope and X-ray diffraction (XRD) analysis respectively. XRD analysis revealed that alumina particles during plasma spraying reach sufficient melting state prior to the impact on the substrate with a velocity comparable to that of conventional plasma spraying. The experimental results have shown that the CPSP has significant influence on the microstructure and other properties of the deposited alumina coating. It also showed that the hollow cathode plasma spray torch is a suitable tool to coat the dense ceramic materials with low input power levels.
KW - Aluminium oxide
KW - Hardness
KW - Hollow cathode
KW - Microscopy
KW - Plasma spraying
KW - Wear
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U2 - 10.1016/j.surfcoat.2008.08.030
DO - 10.1016/j.surfcoat.2008.08.030
M3 - Article
AN - SCOPUS:72049125135
SN - 0257-8972
VL - 203
SP - 129
EP - 136
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 1-2
ER -