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Descripción
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| Due to the similar properties between tungsten and tungsten carbide (WC) as well as to the extensive body on knowledge on WC cermets, WC-Cu cermets with 25, 50 and 75% volume fraction of copper have been devised for thermal barriers. These composite materials have been prepared by hot pressing at temperatures ranging from 1173 to 1423 K with pressures from 22 to 47 MPa. These novel cermets were analysed by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. The thermal conductivity was measured by laser flash technique and the density was evaluated by Archimedes method by immersion in water. Additionally, hardness and elastic modulus were measured by two different methods: Vickers microindentation and instrumented indentation for the hardness measurement and instrumented indentation and flexural vibration resonance method for the elastic modulus. The consolidated materials consisted of homogeneous dispersion of WC particles in the Cu matrix, without any evidence for oxide formation, and with densifications of about 91-95%. Surprisingly, cermets thermal diffusivity, as desirable for thermal barrier materials, is strongly reduced compared to copper or tungsten, even with 25% volume fraction of WC. The mechanical properties revealed that with the increase of the WC content of the cermets, the hardness and elastic modulus are increased. | |
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Internacional
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Si |
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Nombre congreso
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European Congress and Exhibition on Advanced Materials and Processes |
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Tipo de participación
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970 |
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Lugar del congreso
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Tesalónica |
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Revisores
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Si |
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ISBN o ISSN
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0000-0000 |
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DOI
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Fecha inicio congreso
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17/09/2017 |
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Fecha fin congreso
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22/09/2017 |
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Desde la página
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1 |
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Hasta la página
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1 |
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Título de las actas
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High temperature mechanical behavior of WC-Cu thermal barriers for fusion applications |