Estudo do efeito da adição de carbeto de titânio nas propriedades microestruturais e mecânicas do metal duro WC-Fe
The hard metal is widely used in several areas of industry due to its characteristics such as high wear resistance, high fracture toughness and high hardness. Cobalt is the most used metal as a binding phase for hard metal, but other metals such as iron have been shown to be an alternative replac...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/47200 |
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| Resumo: | The hard metal is widely used in several areas of industry due to its
characteristics such as high wear resistance, high fracture toughness and high
hardness. Cobalt is the most used metal as a binding phase for hard metal, but
other metals such as iron have been shown to be an alternative replacement, due
to the high cost of production and toxicity of cobalt. The present work aimed to study
the effect of the addition of 0%, 1.5%, 3.0% and 4.5%, by mass of TiC, to a WC10%Fe composite powder, prepared by grinding at high energy, through properties
obtained from sintered powders and compacts. The composite powders were
processed in a humid environment, using 99% ethyl alcohol in a high energy
planetary mill with a container and carbide balls, under agitation of 400 rpm, with a
ball/powder ratio of 5:1 for 10 hours. Subsequently, the ground powders were
compacted at 200 MPa, in a uniaxial cylindrical 8 mm stainless steel matrix, and
sintered in a resistive oven at 1300 °C, 1400 °C, 1500 °C and 1600 °C for 1 h, under
argon atmosphere and a heating rate of 10 °C/min. To evaluate the composition,
microstructure and properties, materials characterization techniques were used,
such as Vibrating Sample Magnetometer (VSM), Granulometry, Scanning Electron
Microscopy (SEM), X-Ray Diffractometry (XRD). In the consolidated samples,
microstructural analysis, microhardness measurement and density measurement
were performed using the Archimedes method. The results showed that through
high energy milling, homogenization and particle size reduction were obtained,
favoring the sintering process in hard metal. As well, the addition of TiC to WC10%Fe leads to a greater refinement of the microstructure, leading to a maximum microhardness of 1564 HV, with the addition of 3.0% by mass of TiC, at a sintering temperature of 1600°C. |
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