Desenvolvimento de revestimentos superficiais à base de Poliamida 6 e quasicristal por Spin Coating

Abstract

Polyamides are polymers widely used in the industry worldwide, being known as engineering polymer due to its properties such as heat resistance, durability and stiffness, and its varied applications, from films to motor housings. Polymeric materials are being widely applied as composites matrices due to their easy processability, cost and lightness. Among these composites, the use of metallic fillers in polymeric matrices aiming to increase mechanical strength and / or confer specific properties such as special coatings has been gaining ground in research. In this context, the use of quasicrystalline metal alloys (QC) has been studied as fillers for polymeric matrices. Associated with their different microstructural characteristics are their properties of high mechanical strength, wear resistance, low coefficient of friction, low surface energy and high hardness. This sum of features associated with ductile matrices makes a plethora of possibilities feasible for potential applications. The objective of this work was the development of polyamide 6 films with quasicrystalline particles (QC) via Spin Coating technique. The production of quasicrystalline alloys of Al-Cu-Fe was obtained by slow cooling induction casting using recycled aluminum, copper and iron as precursor materials. The alloys were treated and comminuted via high energy milling. For the manufacture of the composites, this powder was diluted in a polyamide 6 polymer matrix with powder additions of 0, 1, 3 and 5% (wt.%). The coatings were obtained via Spin Coating technique. Both powders and coatings were microstructurally characterized by XRD, TG / DTA. In the films, profilometry, contact angle tests and optical microscopy analysis were performed. It was possible to manufacture 6 / QC polyamide coatings. The quasicrystalline particles were dispersed in the polymeric matrix, but with the increase of quasicrystalline charges some clusters were generated. Through TG analysis it was possible to observe that with the increase of quasicrystalline loads there were changes in the thermal stability of the composite. On the other hand, the increase of quasicrystalline fillers did not influence the crystalline melting temperatures of polyamide 6. It was observed that as the quasicrystalline powders increased, there was a reduction in the average roughness (Ra) of the composite samples. On the other hand, in the wettability analyzes with saline water, the coatings with the largest amount of loads were more hydrophobic, the opposite result for oil contact angle analysis.