Síntese, caraterização e avaliação cinética da obtenção de WC-Co através de reação gás - sólido

Abstract

The search for high value-added materials, wide applicability and high sustainability encourages innovation in all areas of engineering. One of the materials currently being developed with such requirements are the doped carbides, which are composed with a mix of ceramics and metals. This work proposes the synthesis, characterization, kinetic evaluation and of tungsten carbide doped with cobalt (WC-Co) in fix and rotating bed reactor. The steps of material production was: synthesis of the precursor of washed by stirring in ethanol of a mixture of ammonium paratungstate and cobalt nitrate, drying th/e slurry obtained in oven for 18h at 80 °C, the dry powder milling, preliminary characterization by SEM techniques, XRD and SDS, gas-solid reaction of reduction at 750, 800 and 850 ° C in an atmosphere of 5% methane and 95% hydrogen in fix bed and rotating bed reactor (at 34 rpm agitation) and the final characterization using the aforementioned techniques. The results show a material containing particles of tungsten carbide with cobalt adhered, with good interfacial and applicable in areas such as in catalysts, membrane reactors and fuel cells, which emphasizes the importance of such research.