Browsing by Keyword "ERS"
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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 Comparison of hard metals fabricated by electrical resistance sintering (ERS) and sinter-HIP(European Powder Metallurgy Association (EPMA), 2016) Schubert, Thomas; Weißgärber, T.; Lagos, M. A.; Agote, I.; Gallardo, J. M.; Montes, J. M.; Prakash, L.; Oikonomou, P.; Andreouli, C.; EXTREMATThis work presents the microstructural characterization and properties of WC-Co hardmetals obtained by ERS (Electrical Resistance Sintering) compared to conventionally sintered material. The new ERS method to obtain cutting tools is being developed within the EFFIPRO project. Thanks to the short processing time, this novel sintering technology will enable an important reduction of energy consumption contrary to traditional furnace sintering methods. In order to study the microstructures and homogeneity of the WC-Co materials, optical and electron microscopy combined with X-ray and magnetic measurements were performed. In addition, mechanical properties (hardness and toughness) of the materials were analysed at different parts of the samples. The results show that relevant parts of ERS processed samples reveal finer microstructures and higher hardness than the conventionally sintered ones.Item Development of electric resistance sintering process for the fabrication of hard metals: Processing, microstructure and mechanical properties: Processing, microstructure and mechanical properties(2017-08-01) Lagos, M.A.; Agote, Iñigo; Schubert, T.; Weissgaerber, T.; Gallardo, J.M.; Montes, J.M.; Prakash, L.; Andreouli, C.; Oikonomou, V.; Lopez, D.; Calero, J.A.; EXTREMATThis work presents the development of the Electrical Resistance Sintering (ERS) process for the fabrication of hard metals. The compositions of the materials produced were WC with 6 and 10 wt% of Co. In addition to the specific characteristics of the technology, the characterization of the produced parts is presented and compared to materials obtained by conventional processes. The parts produced by ERS present densities comparable to the ones obtained by conventional methods. The microstructural comparison shows a considerable grain size reduction in the ERS materials which consequently brings a hardness increase. ERS materials show similar fracture toughness to conventional ones. The very fast sintering allows performing the process without any protective atmosphere, therefore making this process very attractive for the production of materials that need to be sintered under non-oxidising environments. The total duration of the cycle, including heating, holding time and cooling is few seconds. Finally, some considerations about the scale up and possible industrialization of the technology are explained.Item Development of the ers process for the fabrication of hardmetal parts(European Powder Metallurgy Association (EPMA), 2016) Lagos, M. A.; Agote, I.; Gallardo, J. M.; Montes, J. M.; Schubert, T.; Weissgaerber, T.; Prakash, L.; Andreouli, C.; Oikonomou, V.; Lopez, D.; Calero, J. A.; EXTREMATIn the past different field assisted sintering processes like Spark Plasma Sintering (SPS) have emerged as potential alternatives to conventional sintering routes. However, the need to use a sintering chamber is the main drawback for its industrial implementation. Work carried out within the EC funded EFFIPRO project includes the development of a novel hybrid electrical sintering process, performed in air with a very short sintering time (few seconds). These features allow an easy industrialization of the process. With the new technology, cutting tools with real dimension and complex shapes were obtained. A complete characterization of the prototypes is presented including density, microstructure, hardness, toughness and magnetic properties. Energy consumption evaluation was also carried out. Density and mechanical properties present values comparable to conventional materials and for that reason this novel process appears to be an excellent candidate as an alternative to the conventional sintering process for certain tools production, specifically for short production series and customised tools.Item Preliminary comparison of hardmetals obtained by SPS and by electrical resistance sintering (ERS)(European Powder Metallurgy Association (EPMA), 2014) Gallardo, J. M.; Montes, J. M.; Schubert, Th; Weissgaerber, T.; Andreouli, C.; Oikonomou, V.; Prakash, L.; Calero, J. A.; Abrivard, G.; Guraya, C.; Lagos, M. A.; Agote, I.; EXTREMATCutting tools with improved properties and using a new processing method are being developed for both aerospace and automotive applications within EFFIPRO; an EC granted project. The aim of the project is to develop a new energy efficient sintering process for cutting tools production. This new method is based in Joule effect sintering process which allows extremely fast sintering cycles. This work presents the preliminary results obtained during the characterisation of materials obtained using different sintering processes. A comparison of samples obtained by Spark Plasma Sintering (SPS) and Electrical resistance Sintering (ERS) is reported. It was also found that the sintering conditions for ERS are strongly influenced by the electrical conductivity of the powders. Samples obtained by SPS and ERS show a microstructure and properties similar to commercial materials.