Browsing by Author "De Cortazar, Maider García"
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Item Microstructural analysis of the reinforced Al-Cu5mgti/Tib2 5wt % alloy for investment casting applications(2010-06) Egizabal, Pedro; De Cortazar, Maider García; Douin, Joël; Torregaray, Amaia; Lahaye, Michel; Vincent, Cécil; Silvain, Jean Frangois; Tecnalia Research & Innovation; CIRMETALThe paper describes the influence of 5wt % titanium diboride (TiB 2) particles on the microstructure of an Al-Cu alloy produced by plaster casting process. The elaboration route leads to a composite material with 1% of in situ TiB2 particles and 4% ex situ of TiB2 particles. The comparison of the reinforced alloy with the corresponding non-reinforced counterpart makes clear that the presence of TiB2 particles has a large influence in the observed microstructure. The presence of TiB2 particles decreases the grain sizes and the porosity level. It is also found that TiB2 particles play an important role in the precipitation events of Al2Cu precipitates that are formed during solidification at the TiB2/aluminum matrix interfaces.Item Thermal storage nanocapsules by miniemulsion polymerization(2013-03-15) De Cortazar, Maider García; Rodríguez, Raquel; CIRMETAL; POLIMEROSParaffin wax was nanoencapsulated by miniemulsion polymerization. Low solid content batch polymerizations were carried out and the influence of paraffin wax/methyl methacrylate ratio on polymeriztion kinetics, phase change properties, and thermal stability were investigated. Paraffin concentration controls the nucleation mechanism and nanocapsules particle size. The latent heat capacity increases as the content of encapsulated paraffin wax increases. The maximum amount of encapsulated paraffin wax achieved under the experimental conditions was 60 wt %, presenting a latent heat capacity of 140.3 J/g. Moreover, the encapsulated systems present in all cases better thermal stability than pure paraffin wax. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013