Processing and characterisation of cermet/hardmetal laminates with strong interfaces
|Author/s||Córdoba Gallego, José Manuel
Chicardi Augusto, Ernesto
Torres Hernández, Yadir
Gotor Martínez, Francisco José
Bermejo Moratino, Raúl
Dalle, Fabbriche D
|Department||Universidad de Sevilla. Departamento de Química Inorgánica
Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales
|Abstract||Cemented carbides and cermets are potential materials for high speed machining tools. However, cemented carbides are not chemically stable at high temperature and cermets present poor fracture toughness. Novel cermet/hardmetal ...
Cemented carbides and cermets are potential materials for high speed machining tools. However, cemented carbides are not chemically stable at high temperature and cermets present poor fracture toughness. Novel cermet/hardmetal multilayer systems show a huge potential for this intended application. It would be possible to achieve the right balance of the required thermomechanical properties using cermet as temperature protective outer layers and hardmetal as reinforcement layers. In this work, preliminary results on the microstructural and mechanical characterisation of a multilayer TiCxN1-x-Co/WC-Co composite densified by hot pressing are presented, with special attention to the properties of the interface. Microstructural observations revealed the existence of strong bonding interfaces between cermet and hardmetal layers due to chemical interaction during the sintering process. As a consequence, owing to the different coefficient of thermal expansion between cermet and hardmetal, a tensile and compressive biaxial residual stress of σres,Cermet≈+260±50MPa and σres,WC-Co≈-350±70MPa was estimated in the corresponding layers. Microindentation cracks introduced in the cermet layers (the less toughness material) and propagated transversely to the layers were arrested at the interface, showing the combined effect of toughness and compressive stresses on crack shielding.
|Funding agencies||Gobierno de España
Junta de Andalucía
|Project ID.||No. MAT2011-22981
|Citation||Córdoba Gallego, J.M., Chicardi Augusto, E., Torres Hernández, Y., Gotor Martínez, F.J., Bermejo Moratino, R., Medri, V. y Dalle, F.D. (2014). Processing and characterisation of cermet/hardmetal laminates with strong interfaces. Materials & Design, 58, 226-233.|
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