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process (Ref 11). Therefore, spray parameters such as spray torch power, plasma gas composition, and spray distance, which affect melting states and velocities of the particles, or temperature of the substrate determining the cooling rates of the splats on arrival are carefully tuned to achieve the desired porous microstructures. It should be also Coating failures are mainly located in the bond coat/substrate interface at highest adhesion strength. Highest bond strength was obtained with optimum parameters: 44/10 gas flow ratio at 150mm for 600A and 35gr/min feed rate.The Ra 4.8 µm surface roughness show the highest adhesion values at 300 °C. f 23. - 25. The plasma spray parameters were designed to address both the particle state and deposition rate effect on the SPS deposit formation. The particle state was controlled by individually tuning the plasma gas flow rate, plasma power, injection angle while the deposition rate was ad-justed by varying just the torch traverse speed. Tables 1 Detonation- Gun Spray (D-Gun spray) D-gun spray process is thermal spray process which has remarkably good adhesive strength. In this process a coating powder and mixture of oxygen (O2) and acetylene gas (C2H2) is fed through a tubular barrel whose one end is closed while other end is open. The spark plug is used to ignite the gas mixture. for machining a fused coating because of the high hardness. Use of spray-and-fuse coatings is lim- ited to substrate materials that can tolerate the 1010 to 1175 °C (1850 to 2150 °F) fusing tem- peratures. Fusing temperatures may alter the heat-treated properties of some alloys. However, the coating will usually withstand additional heat The plasma spray coating will be carried out at plasma spray processors, Mumbai. 80kW DC non-transferred arc mode Conventional atmospheric plasma spray (APS) set up will be used. In plasma torch input power level will be varied from 30kW to 40 kW, by adjusting the voltage and the arc current. The powder injection is from the nozzle and aim The plasma spraying process involves the generation of a plasma jet, the injection and treatment of particles within the plasma jet and finally the formation of the coating. To generate the plasma jet, a working gas such as an argon/hydrogen mixture is passed through a powerful electric arc discharge formed in the gap between a cathode and To manufacture a coating for an article for a semiconductor processing chamber, the article including a body of at least one of Al, Al2O3, or SiC is provided and a ceramic coating is coated on the body, wherein the ceramic coating includes a compound of Y2O3, Al2O3, and ZrO2. The ceramic coating is applied to the body by a method including providing a plasma spraying system having a plasma Spray gun (spray torch) - spray torch is responsible for reaching the melting point of coating material, acceleration, and spraying process; Coating feeder mechanism: as the name states, the feeder mechanism is responsible for feeding the powder, wire, or liquid to the torch through tubes; Media supply: responsible for transferring gases, liquid, or plasma that generates a flame Summary This chapter contains sections titled: Coatings in the Industrial Environment Surface Coating Techniques Bri