SYMPOSIA PAPER Published: 01 January 2002
STP10479S

Environmental and Thermal Effects on the Toughness of TiCN-Based Materials

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Titanium carbonitrides (TiCN) are very hard materials with increasing technological importance. They are mainly applied in composites with various metal carbides and/or metallic binders for cutting tools. In these applications, high temperatures are usually involved and, sometimes, chemical reactions. Being composed of a metallic-binder phase, in which a hard ceramic phase is dispersed, the performance of these materials can be largely affected by temperature and environment. In this work, nearly fully-dense TiCN based cermets have been produced starting from the following composition (wt%): TiC0.5N0.5+15.3(WC-5%Co)+6.2Ni+2.1Co. Some of the mechanical properties have been routinely measured, such as hardness, Young modulus, fracture toughness and flexural strength. The main effort has been devoted to the study of the effects of temperature and environment on the fracture toughness. Chevron notch tests have been carried out at room temperature, 600 °C, 800 °C and 1 000 °C in static air, flowing air and flowing nitrogen atmosphere. The influence of the interaction between temperature, environment and microstructure on the fracture behavior has been analyzed.

Author Information

Guicciardi, S
Research Institute for Ceramics Technology (IRTEC-CNR), Faenza, Italy
Melandri, C
Research Institute for Ceramics Technology (IRTEC-CNR), Faenza, Italy
Monteverde, F
Research Institute for Ceramics Technology (IRTEC-CNR), Faenza, Italy
Bellosi, A
Research Institute for Ceramics Technology (IRTEC-CNR), Faenza, Italy
de Portu, G
Research Institute for Ceramics Technology (IRTEC-CNR), Faenza, Italy
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Details
Developed by Committee: C28
Pages: 187–198
DOI: 10.1520/STP10479S
ISBN-EB: 978-0-8031-5461-2
ISBN-13: 978-0-8031-2880-4