Abstract
The effects of combustion thermal spraying parameters namely combustion pressure, feeding rate, and carrier gas on the wear resistance, friction coefficient, and Knoop hardness of poly (ethylene terephthalate) (PET) films were investigated. The PET coatings were characterized by measuring the wear coefficients by calowear-type testing, the friction coefficients by a pin-on-disk test, and Knoop hardness. The abrasive wear and friction coefficients of the coatings were compared with the values of a post consumer PET bottle chip reference sample. The structural characteristics of the coatings were investigated by X ray diffraction. Statistical analysis of the results allowed for the systematic characterization of the influence of the process variables mentioned above on the coating wear, friction, and microhardness values. Specifically, this study shows that the process parameters affect the wear coefficient and Knoop hardness significantly, but not the friction coefficient. The degree of crystallinity of the PET coatings varied from 20 to 26%.
Highlights
Thermal spray has emerged as one of the most promising coating techniques, producing new materials with tailored chemical, mechanical, and tribological properties
One of the greatest advantages of thermal spraying compared to other coating techniques is that the coatings can be applied and repaired in the field, and application is not restricted by the size of the surface to be coated[1]
The final coating temperature was around 410 °C, below the degradation temperature of poly(ethylene terephthalate) (PET) (420 °C)
Summary
Thermal spray has emerged as one of the most promising coating techniques, producing new materials with tailored chemical, mechanical, and tribological properties. Thermal-sprayed polymer coatings have gained significant attention from many industries, including the petrochemical, automotive, and aircraft industries. They have been used in surface protection against humidity, corrosion, and aggressive chemical products[1]. One of the greatest advantages of thermal spraying compared to other coating techniques is that the coatings can be applied and repaired in the field, and application is not restricted by the size of the surface to be coated[1]. Polymeric materials are expected to be used in corrosion and wear protection with economic advantages over the currently available alternatives[2]. The thermal spray technique is very versatile due to the wide range of deposition materials and the varying substrate forms and sizes that may be used. Critical process parameters must be selected for each polymer to ensure maximum melting and minimum particle degradation[4]
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