Browsing by Keyword "Hard materials"
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Item Cermets development by Ers process: Effect of the mould on the material properties(2017) Agote, I.; Lagos, M. A.; Da Costa, E.; EXTREMATWC-Co is known for its excellent characteristics such as hardness and wear resistance, for machining and wear resistant applications. Today, both the W and the Co are considered critical materials by the European Union and, in addition, the Co is particularly toxic. This fact makes that alternatives to replace these elements are gaining importance in recent years. This work presents the study of the processing Fe-TiC system by non-conventional sintering process as a potential alternative to some WC-Co compositions. The electrical resistance sintering (ERS) process has been used to obtain fully dense Fe-TiC compositions. ERS is based on Joule heating which allows conducting extremely fast sintering cycles. The Fe-TiC system with different binder content phase was studied and analysed (microstructure, hardness and fracture toughness). The effect of the die used during the sintering process has been studied. It was found that the thermal characteristics of the die play an important role in the obtained materials properties.Item Development of niobium carbide based composites by electric resistance sintering: Microstructure, processing and mechanical properties(European Powder Metallurgy Association (EPMA), 2019) Lagos, M. A.; Gardere, G.; Agote, I.; López, D.; Calero, J. A.; EXTREMATTungsten carbide based hardmetals (WC-Co) are most widely used in different wear conditions because of their excellent wear resistance and fair strength-toughness combination. However, tungsten and cobalt are included in the EU list of critical raw materials representing a relative high economic and supply risk. This work presents an alternative material based on niobium carbide using an innovative stainless-steel binder. The material was obtained by a novel method: ERS (Electric Resistance Sintering). This is a low-cost alternative to Spark Plasma Sintering (SPS). In the developed process the duration of the cycles is very short (seconds) and without protective atmosphere. This work presents the effect of the processing parameters on the microstructure and mechanical properties of the NbC-316L materials. The characterization of the products includes the microstructural analysis, hardness and fracture toughness. It was possible to obtain full densification of the compacts and mechanical properties show interesting preliminary results.