Estudo das curvas de sinterização, microestrutura e microdureza do compósito de Cu-WC
Composite materials have been produced on a large scale in recent years due to the search for a product with different properties for use in different fields of application. Composites generated from a copper matrix and reinforced with a ceramic and refractory material have important functionality i...
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| Formato: | bachelorThesis |
| 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/123456789/50725 |
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| Resumo: | Composite materials have been produced on a large scale in recent years due to the search for a product with different properties for use in different fields of application. Composites generated from a copper matrix and reinforced with a ceramic and refractory material have important functionality in their various applications in electrical conductors and heat sinks. Thus, the present work aimed to analyze the sintering behavior of the composite powder of copper (Cu) reinforced with tungsten carbide (WC) produced through high energy milling (HEM). The MAE of powders with Cu - 10%WC composition was carried out in humid environment at 400 rpm for 2, 10 and 20 hours, using a mass ratio of powder to balls of 1:4. The powders were compacted in a unidirectional press at 150 MPa and the sintering behavior was studied using a dilatometer, at a temperature of 900°C with an isotherm of 1 hour. In this work, a study was carried out of the effect of high-energy grinding in the Cu-WC sintering process, through the sintering, microstructure and Vickers microhardness curves. The sintering curves showed that the green compacts of the powders processed for a longer milling time initially undergo a large expansion, up to 750°C. After that, a greater contraction is observed, indicating a predominance of the diffusion mechanism during the sintering process from this temperature onwards. Samples sintered after 10 hours showed better distribution and impregnation of tungsten carbide in the copper matrix. The microhardness was higher for the longest milling time, 20h, due to the greater refinement of the microstructure. Therefore, for longer grinding times, we have a greater atomic diffusion for the sintering process, a more homogeneous microstructure and a greater microhardness. |
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