“…It is seen that as the slurry rotation speed increases, higher weight loss has occurred in the case of uncoated Al6061 substrate and coated flyash–Al 2 O 3 specimens. With an increase in the speed of slurry rotation for a given constant concentration of slurry, the frequency of slurry contact on the target surface increases resulting in higher weight loss [23, 24, 25]. Figure 16 Variation of weight loss of uncoated Al6061 substrate and coated flyash–Al 2 O 3 substrate for different slurry rotation speed with an error bar of n = 5.…”
The present investigation focuses on the study of erosive slurry wear behaviour of plasmasprayed flyash-Al 2 O 3 composite coatings on the substrate of Al6061 alloy in slurry with 3.5% NaCl solution. The influence of various process parameters, such as different slurry concentration (10-30%), varying rotational speed (500-1500 rev min −1 ) and varied impinging particle sizes (210-425 µm), was compared by conventional weight loss method and Taguchi's L 27 experimental design method. It was observed that the composite coatings on Al6061 alloy showed a highest resistance to erosion. The significance of the parameters was determined by using analysis of variance technique and it was found that the factors slurry concentration and slurry speed had great influence on erosive slurry wear of substrate with and without plasma spray coatings. Regression analysis was used to develop mathematical model to predict the slurry erosive wear. Predicted values are in good agreement with experimental values.
“…It is seen that as the slurry rotation speed increases, higher weight loss has occurred in the case of uncoated Al6061 substrate and coated flyash–Al 2 O 3 specimens. With an increase in the speed of slurry rotation for a given constant concentration of slurry, the frequency of slurry contact on the target surface increases resulting in higher weight loss [23, 24, 25]. Figure 16 Variation of weight loss of uncoated Al6061 substrate and coated flyash–Al 2 O 3 substrate for different slurry rotation speed with an error bar of n = 5.…”
The present investigation focuses on the study of erosive slurry wear behaviour of plasmasprayed flyash-Al 2 O 3 composite coatings on the substrate of Al6061 alloy in slurry with 3.5% NaCl solution. The influence of various process parameters, such as different slurry concentration (10-30%), varying rotational speed (500-1500 rev min −1 ) and varied impinging particle sizes (210-425 µm), was compared by conventional weight loss method and Taguchi's L 27 experimental design method. It was observed that the composite coatings on Al6061 alloy showed a highest resistance to erosion. The significance of the parameters was determined by using analysis of variance technique and it was found that the factors slurry concentration and slurry speed had great influence on erosive slurry wear of substrate with and without plasma spray coatings. Regression analysis was used to develop mathematical model to predict the slurry erosive wear. Predicted values are in good agreement with experimental values.
“…As a ceramic coating, yttrium oxide coating can strengthen the corrosion resistance, wear resistance, thermal barrier and high temperature oxidation resistance of the metal substrate [1,2] , thereby increasing the service life of the metal substrate and expanding the scope of application. The metal matrix materials protected by ceramic coating also possess excellent properties of metals, such as high strength, high plasticity, electrical conductivity, etc., as well as excellent properties such as corrosion resistance, stability, high temperature oxidation resistance and hard texture of ceramic materials in the coating, so the materials combined by coating and matrix are suitable for many fields [3] .…”
Y 2 O 3 coatings were fabricated on using atmospheric plasma spraying (APS). The effects of different process parameters on the microstructure and properties of the coating were analyzed. The results show that the overall morphology of Y 2 O 3 coatings are smooth at high spraying power, low spraying distance and low primary gas flow rate, which is consistent with the change trend of porosity and hardness. The minimum porosity of coating is about 1.4%. The roughness of coatings isn't sensitive to changes in parameters.Y 2 O 3 coatings have excellent corrosion resistance. The smaller the porosity of Y 2 O 3 coating, the better the corrosion resistance.
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