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- Saravanan, P., et al.
(författare)
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Influence of spraying variables on structure and properties of plasma sprayed alumina coatings
- 2000
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Ingår i: British Ceramic Transactions. - London, United Kingdom : Inst of Materials. - 0967-9782 .- 1743-2766. ; 99:6, s. 241-247
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Tidskriftsartikel (refereegranskat)abstract
- An experimental statistical design study on the plasma spraying of alumina powder has been carried out.Coating experiments were conducted, using a Taguchi full factorial L16 design parametric approach, to study the effect of four key plasma processing variables on the coating quality, namely, primary gas flow rate, arc current, powder feed rate, and spray distance. Optical microscopy, scanning electron microscopy, XRD, image analysis, and hardness testing were used for characterization. The resulting as sprayed coating characteristics were quantified with respect to roughness, microhardness, porosity, and microstructure. Through statistical calculation (analysis of variance), the parameters that have significant influence on the structure and properties of the coatings were identified and their relative importance and contribution ratios to overall variance were studied. The Taguchi evaluation employed in the present investigation showed that an improvement in the coating properties could be achieved using an optimum combination of variables.
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| 2. |
- Saravanan, P., et al.
(författare)
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Study of plasma- and detonation gun-sprayed alumina coatings using Taguchi experimental design
- 2000
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Ingår i: Journal of thermal spray technology (Print). - Materials Park, OH, United States : ASM International. - 1059-9630 .- 1544-1016. ; 9:4, s. 505-512
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Tidskriftsartikel (refereegranskat)abstract
- Atmospheric plasma spraying (APS) is a most versatile thermal spray method for depositing alumina (Al2O3) coatings, and detonation gun (D-gun) spraying is an alternative thermal spray technology for depositing such coatings with extremely good wear characteristics. The present study is aimed at comparing the characteristics of Al2O3 coatings deposited using the above techniques by using Taguchi experimental design. Alumina coating experiments were conducted using a Taguchi fractional-factorial (L8) design parametric study to optimize the spray process parameters for both APS and D-gun. The Taguchi design evaluated the effect of four APS and D-gun spray variables on the measured coating attributes. The coating qualities evaluated were surface roughness, porosity, microhardness, abrasion, and sliding wear. The results show that the coating quality is directly related to the corresponding coating microstructure, which is significantly influenced by the spray parameters employed. Though it is evident that the D-gun-sprayed coatings consistently exhibit dense and uniform microstructure, higher hardness, and superior tribological performance, the attainment of suitable plasma-sprayed coatings can be improved by employing the Taguchi analysis.
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