Production and characterization of thermally sprayed polyethylene terephthalate coatings

Hardness, adhesion index and microstructure of PEEK coating on Al or Fe substrate by LVOF flame spray

“…3c-f. It was found that the samples with the preheated substrates at 200 • C exhibited smooth and flat topsurface with a good physical bonding between the coating and the substrate, a similar finding being published by Duarte et al [21]. However, it was interesting to note that increasing the preheating temperature of substrate to 300 • C resulted in a small amount of pores within the coating layers.…”

“…However, it was interesting to note that increasing the preheating temperature of substrate to 300 • C resulted in a small amount of pores within the coating layers. These pores may be a result of some thermal degradations of PEEK during the spraying process, this statement being supported by Duarte et al [21]. It should be noted that although the substrate temperature of 300 • C was lower than the degradation temperature of the PEEK (579 • C by TGA test), it was still possible for the PEEK to degrade.…”

“…This view was supported by Zhang et al [10] and Liao et al [22]. Duarte et al [21] stated that a substrate without preheating exhibited a rough top-surface and pores in the coating resulting in a poor adhesion at the interface. In relation to this work, a smooth top-surface was observed at a preheating temperature of 200 • C. The differences in optimum preheating temperatures may possibly result from differences in spray distances (dwell time), flame temperatures (gas ratio) and substrate geometries.…”

Wear behaviour of thermal flame sprayed FeCr coatings on plain carbon steel substrate

“…However, the sprayed composite coatings possess a porous structure, respectively. Especially, plasma sprayed FeCr-TiC composite coatings contain 16-20% porosity [4]. Also, coatings obtained from powders and wires with FeCrB composites are highly porous, because of insufficient time to melt completely of the powder [16].…”

Fotodegradação de recobrimentos de poli (tereftalato de etileno) pós-consumo e suas blendas depositadas em aço

“…A literatura registra valores de T g para o EMAA próxi-mos a 100ºC, que foi o valor determinado da temperatura de fusão do EMAA (Duarte et al, 2004).…”