VALENZA , Fabrizio

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A structural and microstructural study was performed on several compositions of the Smy(FexNi1-x)4Sb12 system treated at three different pressures during the spark plasma sintering (SPS) process. Aim of the study is to recognize the effect of applied pressure at a fixed temperature on composition, microstrain and domains size, due to the...

Transparent ceramic materials may be used as optical windows, sensors, gas-tight components, etc. in specific marine applications by integration into metallic structures through joining procedures. In such systems the evaluation of galvanic effects between base alloys and compounds obtained during brazing is crucial. In this work, the galvanic...

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The wetting of Ni-Hf and Ni-Cr-Hf alloys on sapphire has been studied in this work. Sapphire represents a "simple" and ideal case adopted for better understanding the basic phenomena involved in liquid/solid contact during casting of Ni-based superalloys. Wettability tests were performed by means of the sessile drop method at 1500 °C; moreover,...

The isothermal wetting, spreading behaviour and interfacial reactivity of NiAl1, NiAl10 and NiAl25 alloys (1, 10, 25 at% Al, respectively) on monocrystalline alumina (sapphire) and polycrystalline zirconia oxides stabilized with MgO (stoichiometric and non-stoichiometric ones) were studied by means of the sessile drop method at 1500 °C in...

The effect of varying the applied pressure during the processing by spark plasma sintering (SPS) of samples belonging to the Smy(FexNi1-x)4Sb12 system has been investigated by evaluating the power factor of the obtained filled skutterudite. A strong dependence of both the electrical conductivity and the Seebeck coefficient on the applied...