Browsing by Author "López, D."
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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.Item Development of the ERS process for the fabrication of titanium components(European Powder Metallurgy Association (EPMA), 2020) Lagos, M. A.; Agote, I.; Vicente, A.; Amigó, V.; López, D.; Calero, J. A.; EXTREMATElectric Resistance Sintering (ERS) 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. These features allow an easy industrialization of the process. This paper shows the processing of different titanium alloys by ERS and the effect of the type of powder and composition in the densification of the alloys. The characterization of the products includes the microstructural analysis, EBSD, crystallographic phases by XRD, elastic modulus and bending strength. In addition, oxygen content of the obtained materials was analyzed in detail considering the parameters of the process. It was possible to obtain full densification of the compacts and mechanical properties show interesting results.Item Effect of ERS process parameters on the microstructure and mechanical properties of Ti6Al4V(European Powder Metallurgy Association (EPMA), 2019) Amigó-Mata, A.; Gouvea, Eber; Lagos, M. A.; López, D.; Jesús-Romero, I.; Agote, I.; Vicente-Escuder, A.; Calero, J. A.; EXTREMATThe application of the Electric Resistance Sintering (ERS) process has the advantage of rapid densification and sintering, but it needs to analyse the influence of the parameters on the microstructure and final mechanical properties in a titanium alloy. In an ERS equipment, different current intensities will be applied to atomized powders of Ti-6Al-4V using the commercial pure Ti (CP) with the same parameters as the reference material. Its effect on the microstructure obtained along the thickness of the sample will be analysed. The mechanical characteristics will be determined by tensile and cantilever bending tests, together with maps of microhardness distribution that allows relating the mechanical behaviour with the microstructure applying backscattered electron diffraction techniques (EBSD).