UHTC composites for thermal protection systems (Abstract/Poster in convegno)

Type
Label
  • UHTC composites for thermal protection systems (Abstract/Poster in convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Bellosi A.; Monteverde F.; Sciti D.; Silvestroni L.; Medri V. (2009)
    UHTC composites for thermal protection systems
    in International Conference and Exhibition of the European Ceramic Society 2009, Cracovia, Polonia
    (literal)
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  • Bellosi A.; Monteverde F.; Sciti D.; Silvestroni L.; Medri V. (literal)
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  • In: ECerS 2009 - International Conference and Exhibition of the European Ceramic Society 2009 (Cracovia, Polonia, 21-25 Giugno 2009). Abstract, p. 126. Polish Ceramic Society, 2009. (literal)
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  • High performance Ultra-High-Temperature Composites (based on zirconium-, hafnium-, tantalum- borides and carbides) are characterized by relevant and unique thermo-physical and thermo-mechanical properties, suitable for applications in thermo-protection systems for aerospace applications. In spite of the difficult sinterability of borides and carbides of Zr, Hf, Ta, recent results highlighted that UHTC ceramics can be produced with full density, fine microstructure and controlled mechanical and thermal properties, through different procedures: pressureless sintering and hot pressing combined with the use of proper sintering aids, reactive synthesis/sintering procedures starting from precursors, field assisted technologies like spark plasma sintering (SPS). The selection of reinforcing phase (SiC, B4C, TaSi2, MoSi2, etc) is suitable to improve mechanical properties and oxidation resistance of ceramics like ZrB2, HfB2, HfC, TaC, ZrC. Strength as high as ~ 800MPa at room temperature and up to 600 MPa at 1500°C in air were obtained, consequently to tailored compositions and processing control. SPS proved to be a very rapid fabrication process leading to refined microstructure and high properties of UHTC composites. However, barriers still exist toward the application in hot structures for aerospace and other industrial applications: i) UHTC composites suffer from low toughness: attempts to improve this property are presented; ii) it is necessary to develop techniques for the production of complex shapes. Examples are shown about the fabrication of components either by EDM from simple dense shapes, or through forming techniques like slip casting and tape casting. Several examples are presented for the production of dense or porous bodies (literal)
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  • CNR-ISTEC, Faenza (literal)
Titolo
  • UHTC composites for thermal protection systems (literal)
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