PLASMA SPRAY DEPOSITION OF MATERIALS

Abstract Plasma spray deposition of epoxies under normal conditions produces coatings with low wear resistance. The research shows that the difficulty in achieving satisfactory properties is a result of the rapid heat flow from the coating to the substrate, which suppresses the crosslinking reaction. The results indicate that the use of substrate preheating or ceramic undercoats enhances the wear resistance by promoting the curing reaction during spraying.

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System Characterization and Plasma-Particle Distribution Analysis for Development of a Closed Loop Control for Plasma Spray

10.1115/imece2000-1500 ◽

2000 ◽

Author(s):

M. Gevelber ◽

D. Wroblewski ◽

J. Fincke ◽

W. D. Swank

Keyword(s):

Plasma Spray ◽

Spray Deposition ◽

Distribution Analysis ◽

Real Time Control ◽

Critical System ◽

Loop Control ◽

Time Control ◽

System Characterization ◽

Advanced Control ◽

And Performance

Abstract This paper investigates the need to develop an advanced control system for plasma spray deposition. The limitations and performance capability of both feed forward and real-time control are evaluated. Critical system characteristics for developing such controllers are experimentally identified including dominant nonlinearalities; dynamics, cross-coupling, distributions, and sensor issues.

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Dry Sliding Wear Behavior of Ni-Cr/Micro-ZrO2 Coated AISI 410 Grade Steel-Final Revision

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.787.454 ◽

2015 ◽

Vol 787 ◽

pp. 454-459

Author(s):

K.G. Girisha ◽

R. Rakesh ◽

K.C. Anil ◽

K.V. Sreenivas Rao

Keyword(s):

Plasma Spray ◽

Sliding Wear ◽

Spray Deposition ◽

Dry Sliding Wear ◽

Dry Sliding ◽

Average Particle ◽

Low Grade ◽

Air Plasma Spray ◽

Air Plasma ◽

Grade Steel

The most common industrial needs of coatings are to improve the surface properties such as, wear resistance, corrosion resistance and thermal conductivity/insulation. The use of expensive high strength materials and super alloys can be mitigated by using low grade materials covered with suitable coatings compatible with the media and service. Air plasma spray deposition method is used to achieve dense coating on substrate. The present research work demonstrates the wear properties of Ni-Cr/Micro-ZrO2 coating prepared through air plasma spray deposition (PSD) method. In this process, ZrO2 particulates of average particle size (10-40µm) were sprayed on Ni-Cr coated AISI 410 grade steel substrate. Distribution of ZrO2 particle was found uniform throughout the coating as revealed from SEM microphotographs. Dry sliding wear tests were performed on Pin-On-Disc Tribometer at room temperature with moderate humidity conditions. Significant improvement in wear performance was observed in Ni-Cr/Micro- ZrO2 coating deposited on steel via PSD which was also evident from worn surface morphology.

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