Effect of atmospheric plasma spraying parameters on porosity level of alumina coatings

Thirumalaikumarasamy, D.; Shanmugam, K.; Balasubramanian, V.

doi:10.1179/1743294412y.0000000058

Cited by 24 publications

(13 citation statements)

References 22 publications

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“…This technology also allows one to spray a wide range of high-performance materials with high melting points, such as refractory alloys, cermets and ceramics. [1][2][3][4][5][6] Ceramic coatings like chromium oxide coatings usually exhibit good mechanical properties, excellent hardness and chemical inertness. 7 For this reason, plasma-sprayed Cr 2 O 3 coatings are widely used to improve the wear and corrosion resistance of metallic components against aggressive environments, such as water turbines, pistons, cylinders and actuator rods in hydraulic engineering.…”

Section: Introductionmentioning

confidence: 99%

Effects of sealing on corrosion behaviour of plasma-sprayed Cr₂O₃–8TiO₂ coating

Zhang

Wang

Peng

2013

Surface Engineering

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Plasma-sprayed Cr 2 O 3 -8 wt-% TiO 2 coatings were deposited on mild steel and sealed by epoxy resin and silicone resin in different processes. The microstructure and corrosion resistance of all coatings were investigated. The results showed that silicone resin sealant can seal the coating well and 91% of interconnected porosity was blocked. The sealant can penetrate into the coating by more than 280 mm. The coating sealed with silicone resin in vacuum conditions had the highest corrosion potential E corr (2375 mV) and lowest corrosion current density i corr (17 mA m 22 ) in electrochemical tests. Correspondingly, the unsealed coating had the lowest E corr and highest i corr . The corrosion resistance of the coatings was in the following order: coating sealed with silicone resin in vacuum.coating sealed with silicone resin in air.coating sealed with epoxy resin in vacuum.coating sealed with epoxy resin in air.unsealed coating.

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Section: Introductionmentioning

confidence: 99%

Effects of sealing on corrosion behaviour of plasma-sprayed Cr₂O₃–8TiO₂ coating

Zhang

Wang

Peng

2013

Surface Engineering

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“…Nevertheless, there are many other parameters, which influence also the coatings structure and properties. Therefore, their optimization is very important [11][12][13].…”

Section: Atmospheric Plasma Spraying (Aps)mentioning

confidence: 99%

Review of Functionally Graded Thermal Sprayed Coatings

et al. 2020

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The paper briefly describes major thermal spray techniques used to spray functionally graded coatings such as atmospheric plasma spraying, high velocity oxy-fuel spraying, suspension and solution precursor plasma spraying, and finally low and high pressure cold gas spray method. The examples of combined spray processes as well as some examples of post spray treatment including laser and high temperature treatments or mechanical one, are described. Then, the solid and liquid feedstocks used to spray and their properties are shortly discussed. The reviewed properties of functional coatings include: (i) mechanical (adhesion, toughness, hardness); (ii) physical (porosity, thermal conductivity and diffusivity, thermal expansion, photo-catalytic activity), and; (iii) bioactivity and simulated body fluid (SBF) corrosion. These properties are useful in present applications of functionally graded coatings as thermal barriers, the bioactive coatings in prostheses, photo-catalytic coatings in water treatment, coatings used in printing industry (anilox and corona rolls). Finally, some of the future possible fields of functional thermal sprayed coatings applications are discussed, e.g., to coat polymer substrates or to use the cheap technology of low pressure cold gas spray method instead of expensive technology of vacuum plasma spraying to obtain bond coatings.

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“…The injected powder will undergo heat treatment that affects the morphology of the deposit, its features, and performances. The more significant parameters are the hydrogen in the gas plasma mixture, 11,12 the power of the torch, 13,14 the roughness and the temperature of the substrate, 15,16 the size of the powders, 13 the projection distance, 4,13,16 and the penetration of particles in the plasma jet. The lack of control over these parameters in each step of the process leads to structural defects such as porosity, poorly melted particles, microcracking, reduced adhesion, and in some cases detachment of the substrate.…”

Section: Introductionmentioning

confidence: 99%

Effects of 316SS addition on the properties of the coatings based on Al₂O₃ applied by plasma spraying

Chebbi

Guipont

Elleuch

et al. 2018

Journal of Composite Materials

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Ceramic plasma-sprayed coatings are successfully used for prolonging the service life of industrial components where high wear and corrosion resistance are required. In this work, various types of coatings based on alumina were deposited by atmospheric plasma spraying on 304 L austenitic stainless steel substrate. These coatings were used in further tribological studies. For the atmospheric plasma spraying applications, spraying parameter choices such as carrier gases, plasma enthalpy, current intensity, spraying distance, and particles granulometry are the key issues. Two kinds of Al2O3 particle sizes 2–12 µm (Amperit) and 15–45 µm (Norton) were used to prepare pure and composite coatings. The spraying distance was varied from 90 mm to 120 mm. Microstructure characterization performed by scanning electron microscopy showed that the Amperit powders projected at a distance of 90 mm provided better cohesion and a more dense microstructure. However, the choice of the spraying distance of 120 mm was defined to manufacture composite structures, which allowed more stability in the plasma jet and enabled large metal particles to be mixed with ceramics. To develop hard and wear-resistant coatings, alumina and 316SS were mixed with different addition rates by volume (Al2O3–5 vol.%316SS and Al2O3–25 vol.%316SS) and fed through a single injection port. Composite coatings include porosity and unmolten particles in a lamellar microstructure. The addition of 316SS powder led to the formation of typical layered structure due to the effect of viscosity and different densities of the two particles. These coatings were investigated by different tests to evaluate microhardness, cohesion, and fracture values of such materials. Despite the significant decrease in the microhardness values, the 316SS particle addition demonstrates an improvement in the toughness and crack resistance.

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Effect of atmospheric plasma spraying parameters on porosity level of alumina coatings

Cited by 24 publications

References 22 publications

Effects of sealing on corrosion behaviour of plasma-sprayed Cr₂O₃–8TiO₂ coating

Effects of sealing on corrosion behaviour of plasma-sprayed Cr₂O₃–8TiO₂ coating

Review of Functionally Graded Thermal Sprayed Coatings

Effects of 316SS addition on the properties of the coatings based on Al₂O₃ applied by plasma spraying

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Effect of atmospheric plasma spraying parameters on porosity level of alumina coatings

Cited by 24 publications

References 22 publications

Effects of sealing on corrosion behaviour of plasma-sprayed Cr2O3–8TiO2 coating

Effects of sealing on corrosion behaviour of plasma-sprayed Cr2O3–8TiO2 coating

Review of Functionally Graded Thermal Sprayed Coatings

Effects of 316SS addition on the properties of the coatings based on Al2O3 applied by plasma spraying

Contact Info

Product

Resources

About

Effects of sealing on corrosion behaviour of plasma-sprayed Cr₂O₃–8TiO₂ coating

Effects of sealing on corrosion behaviour of plasma-sprayed Cr₂O₃–8TiO₂ coating

Effects of 316SS addition on the properties of the coatings based on Al₂O₃ applied by plasma spraying