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oai:recercat.cat:2117/4165422026-01-23T03:41:20Zcom_2072_1033col_2072_452950

A comparative study on the wear performance and high-temperature oxidation of co-free fermets and hardmetals Biedma, Ángel Sánchez, Gabriel de Nicolás Morillas, María Bertalan, Claudio Useldinger, Ralph Llanes Pitarch, Luis Miguel Gordo Odériz, Elena Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials Universitat Politècnica de Catalunya. CIEFMA-PROCOMAME - Disseny Microestructural i Fabricació Avançada de Materials Àrees temàtiques de la UPC::Enginyeria dels materials Alternative hard materials Wear response High-temperature oxidation Mechanisms The present investigation addresses the mechanical properties, wear behaviour, and high-temperature oxidation of cermets and hardmetals based on either Ti(C,N) or WC and a metal binder based on Fe15Ni or Fe15Ni10Cr. This study also includes a commercial-grade WC-Co for comparative purposes. The production of these materials involved a powder metallurgy and sinter-HIP processing route under identical conditions. It is found that WC-based materials have superior mechanical properties, including hardness, fracture toughness, transversal rupture strength (TRS), and wear response, compared to Ti(C,N)-based materials. However, the latter show better oxidation behaviour than the former. Notably, WC-FeNi exhibits a higher hardness and TRS than the commercial-grade material (an increase of 7% and 9%, respectively). The difference in wear behaviour is due to the difference in wear mechanisms. In this regard, cermets wear through a tribolayer of Ti and Fe oxides, while hardmetals primarily wear through abrasion from ploughing. Thus, hardmetals exhibit a lower coefficient of friction (COF) and wear rate than cermets. Furthermore, Ti(C,N)-based materials form a protective layer of TiO2, which enhances their integrity and reduces mass gain. The addition of Cr to the FeNi binder only appears to have a clear effect on the TRS of the materials. Peer Reviewed Postprint (published version) 2024-07-01 Article Biedma, Á. [et al.]. A comparative study on the wear performance and high-temperature oxidation of co-free fermets and hardmetals. "Materials (Basel)", 1 Juliol 2024, vol. 17, núm. 14, article 3615. 1996-1944 https://hdl.handle.net/2117/416542 10.3390/ma17143615 eng https://www.mdpi.com/1996-1944/17/14/3615 http://creativecommons.org/licenses/by-nc-nd/4.0/ Open Access Attribution-NonCommercial-NoDerivatives 4.0 International application/pdf Multidisciplinary Digital Publishing Institute (MDPI)