Diffusion parameters of grain-growth inhibitors in WC based hardmetals with Co,Fe/Ni and Fe/Co/Ni binder alloys |
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| Affiliation: | 1. Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164 CT, 1060 Vienna, Austria;2. Vienna University of Technology, USTEM, Wiedner Hauptstr. 8–10, 1040 Vienna, Austria;3. University of Vienna, Department of Lithospheric Research, Althanstraße 14, 1090 Vienna, Austria;4. CNRS, IFREMER, 29286 Plouzané-Brest, France;1. CIEFMA, Departament de Ciència dels Materials i Enginyeria Metal?lúrgica, Universitat Politècnica de Catalunya, ETSEIB, Barcelona 08028, Spain;2. CRnE, Centre de Recerca en Nanoenginyeria, Universitat Politècnica de Catalunya, Barcelona 08028, Spain;3. Sandvik Hyperion, Coventry CV4 0XG, UK;1. Materials Science and Engineering, KTH Royal Institute of Technology, Brinellv. 23, 100 44 Stockholm, Sweden;2. Sandvik Coromant R&D, Lerkrogsv. 19, 126 79 Stockholm, Sweden;3. Seco Tools AB, Björnbacksv. 2, 737 82 Fagersta, Sweden;4. Å?ngström Tribomaterials Group, Applied Materials Science, Uppsala University, Lägerhyddsv. 1, 751 21 Uppsala, Sweden |
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| Abstract: | The diffusion behaviour of the grain-growth inhibitors (GGI) Cr and V during early sintering stages from 950 to 1150 °C was investigated by means of diffusion couples of the type WC-GGI-binder/WC-binder. Besides Co, also alternative Fe/Ni and Fe/Co/Ni binder alloys were investigated. It was found that the diffusion in green bodies differs significantly from sintered hardmetals. Diffusivities in the binder phase were determined from diffusion couples prepared from model alloys and were found to be almost equal for Co and alternative binder alloys. The diffusion parameters determined from green bodies allowed to estimate the GGI distribution in a hardmetal during heat up. This was subsequently used to estimate an appropriate grain size of VC and Cr3C2 in hardmetals, which is required to ensure a sufficient GGI distribution during sintering before WC grain-growth initiates. |
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