Abrasão, desgaste e atrito sob deslizamento de recobrimentos preparados por aspersão térmica a partir de PET pós-consumo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This work intends to contribute to the development of polymer coatings by combustion thermal spraying of recycled poly(ethylene terephthalate) PET for the improvement of the tribological behavior of carbon steel piping. Coatings with high wear resistance may reduce corrosion, the formation of organic and inorganic deposits, and the friction of the transported products with the internal wall of pipes. The decreased pipework flow can contribute to reducing operational and maintenance costs and increase the useful life of the pipes. The application of polymeric coatings, mainly from post-consumer PET, is technically and economically feasible, and may contribute to PET recycling and self-sustained development. First, the influences of the thermal spraying parameters, combustion pressure, feeding rate, and carrier gas, on the wear resistance, the friction coefficient, and on the tribological performance of PET coatings were evaluated by using the design of experiments technique. The coatings were characterized by measuring the wear coefficient, the friction coefficients and the hardness. The abrasive wear and friction coefficients of the coatings were compared with the values of reference samples of post-consumer PET bottle chips and PET powder. The PET coatings obtained in this investigation presented low friction coefficient and high wear resistance values. The microstructure of the coatings are presented and discussed based on the morphology of PET splats and their contribution for film formation. The PET coatings presented well-delimited and juxtaposed splats on the top part, also suggesting good coalescence due to the effect of the parameters used in the thermal spray process. It was not observed the presence of either bubbles or pores at the substrate/coating interface or in the PET coating medium by either optical microscopy or scanning electron microscopy. However, they were observed on the free surface of the coatings. The crystallinity index of the films was evaluated by X-ray diffraction and differential scanning calorimetry (DSC). The behavior of the in-flight particles and the gas dynamics was manipulated by adjusting the operation parameters, which directly influences the film microstructure. Another application of interest of the coatings developed this work is to develop coatings against the incrustation of Limnoperna Fortunei. Coatings formed by thermal spraying 10% PET, PET/Cu and 20% PET/Cu were tested. The 20% PET/Cu film prevented incrustation successfully.

ASSUNTO(S)

1. aspersão térmica - teses. 2. tribologia - teses. 3. planejamento experimental - teses. 4. desgaste mecânico - teses. i. universidade federal de ouro preto. ii. título. engenharias

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