Desenvolvimento e caracterização de um composto magnético a partir de uma matriz de polímero a partir de resíduos gerados pela regulação do fluxo de concentradores

The induction heating treatment process is used when it is necessary to obtain high wear resistance, high mechanical strength and high resistance to fatigue on the surface of the materials. This process changes the surface properties without changing the properties of the nucleus. It is a process widely used because it is fast and offers low cost compared to other heat treatments, besides allowing the heating treatment in specific parts of the components. In this type of heating treatment, the material is heated by a magnetic field generated by a high frequency alternating current that passes through an inductor. The field generated depends on the strength of the material and the number of turns of the coil. To improve the efficiency of the process (reduce operating time and power consumption), it is usually used a magnetic flux concentrator which is constituted by soft magnetic materials. This magnetic flux concentrator consists essentially of ferromagnetic components and a dielectric binder. In some industrial processes the dimensional adjustment of this tool, can eventually cause loss of raw material and production of waste. The aim of this work was the elaboration and characterization of a magnetic composite of polymeric matrix from the waste generated by the dimensional adjustment of the concentrators flow. To prepare the magnetic composite, the magnetic waste was ground (passing # 140 sieve) and mixed with two different types of phenolic resin (HRJ and CR2001) at a concentration of 3%wt. The magnetic composites obtained were characterized according to morphology, mechanical properties, magnetic properties, electrical properties and environmental impact. The results showed that the composites presented a reduction of magnetic and mechanical properties compared to the original material. However, the reduction of magnetic losses observed for the magnetic composite obtained, highlights the potential of this composite for the use as a magnetic flux concentrator.

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