http://www.cnr.it/ontology/cnr/individuo/prodotto/ID120244

Ultra-High Temperature Ceramics and related Composites: potentialities and perspectives. (Abstract/Poster in convegno)

Type

Abstract/Poster in convegno (Classe)
Prodotto della ricerca (Classe)

Label

Ultra-High Temperature Ceramics and related Composites: potentialities and perspectives. (Abstract/Poster in convegno) (literal)

Anno

2009-01-01T00:00:00+01:00 (literal)

Alternative label

Bellosi A. (2009)
Ultra-High Temperature Ceramics and related Composites: potentialities and perspectives.
in European Congress on Advanced Materials and Processes, Glasgow
(literal)

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Bellosi A. (literal)

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In: EUROMAT 2009 - European Congress on Advanced Materials and Processes (Glasgow, 7-10 Settembre 2009). Abstract, The Institute of Materials, 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 aerospace and industrial sector demanding ultrarefractory components. In spite of the difficult sinterability of borides and carbides of Zr, Hf, Ta, recent results highlighted that UHTC ceramics can be successfully produced with full density, fine and uniform 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. Complex shapes can be fabricated either by electrical discharge machining from simple dense shapes, or through forming techniques like slip casting and tape casting combined to gas pressure sintering. Several examples are presented for the production of dense or porous bodies (literal)

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