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Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system.
Cedillos-Barraza, Omar; Manara, Dario; Boboridis, K; Watkins, Tyson; Grasso, Salvatore; Jayaseelan, Daniel D; Konings, Rudy J M; Reece, Michael J; Lee, William E.
Afiliación
  • Cedillos-Barraza O; Centre for Advanced Structural Ceramics, Department of Materials, Imperial College London, South Kensington, London, SW7 2AZ, UK.
  • Manara D; European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany.
  • Boboridis K; European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany.
  • Watkins T; European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany.
  • Grasso S; Utah State University, Department of Mechanical and Aerospace Engineering, Logan, Utah, USA.
  • Jayaseelan DD; School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK.
  • Konings RJ; Centre for Advanced Structural Ceramics, Department of Materials, Imperial College London, South Kensington, London, SW7 2AZ, UK.
  • Reece MJ; European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany.
  • Lee WE; School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK.
Sci Rep ; 6: 37962, 2016 12 01.
Article en En | MEDLINE | ID: mdl-27905481
TaC, HfC and their solid solutions are promising candidate materials for thermal protection structures in hypersonic vehicles because of their very high melting temperatures (>4000 K) among other properties. The melting temperatures of slightly hypostoichiometric TaC, HfC and three solid solution compositions (Ta1-xHfxC, with x = 0.8, 0.5 and 0.2) have long been identified as the highest known. In the current research, they were reassessed, for the first time in the last fifty years, using a laser heating technique. They were found to melt in the range of 4041-4232 K, with HfC having the highest and TaC the lowest. Spectral radiance of the hot samples was measured in situ, showing that the optical emissivity of these compounds plays a fundamental role in their heat balance. Independently, the results show that the melting point for HfC0.98, (4232 ± 84) K, is the highest recorded for any compound studied until now.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido