Browsing by Author "Torrecillas, R."
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Item Thermoelectric materials for automotive and marine applications(European Powder Metallurgy Association (EPMA), 2014) Agote, I.; Lagos, M. A.; Tunbridge, J.; Dixon, R.; Reece, M.; Ning, H.; Gilchrist, R.; Summers, R.; Gelbstein, Y.; Simpson, K.; Rouaud, C.; Feulner, P.; Rivera, S.; Torrecillas, R.; Husband, M.; Crossley, J.; Robinson, I.; Stella, M.; Bonfreschi, C.; EXTREMATThermoelectric materials with improved thermoelectric properties are being developed for both marine and automotive applications within POWERDRIVER; an EC granted project. The aim of the project is to reuse the waste heat generated by the exhaust systems to convert it into electrical powder by means of the (Thermo Electric Generator) TEG under development. Two types of scenarios are being investigated: high temperature exhaust gases (automotive applications) and low temperature exhaust gases (Marine applications). Each of the scenarios requires thermoelectric materials with maximal TE (Thermo-Electric) properties within the application temperature window. For the high temperature scenario n-type MgSi based silicides and p-type MnSi based silicides are being developed. Concerning the low temperature scenario; n-type PbTe- based and and p-type GeTe- based chalcogenides are being studied. Materials with promising TE properties with ZT values around 1.2 are being obtained. This work presents the preliminary results of the TE properties obtained in the new developed thermoelectric materials.Item Zirconia-multiwall carbon nanotubes dense nano-composites with an unusual balance between crack and ageing resistance(2011-06) Garmendia, N.; Grandjean, S.; Chevalier, J.; Diaz, L. A.; Torrecillas, R.; Obieta, I.; Tecnalia Research & InnovationYttria stabilized zirconia (Y-TZP) ceramics are used in a wide variety of applications, such as orthopaedic and dental implants. Y-TZP offers indeed a unique combination of biocompatibility and mechanical properties (high crack resistance for a ceramic). However, the major drawback of Y-TZP is their lack of stability: zirconia is prone to ageing, especially under humid atmosphere. Increasing the ageing resistance of Y-TZP led so far to a decrease of toughness and crack resistance. Here we show that the addition of a small volume fraction of multiwall carbon nanotubes (MWCNT) in a polycrystalline nano-structured Y-TZP sintered under specific conditions (Spark Plasma Sintering) leads to a material exhibiting a balance between ageing and crack resistance never reached before.