Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Catalytic activity of Ni3Al foils in decomposition of selected chemical compounds

nr katalogowy: 52762

Alloys based on the Ni3Al intermetallic phase, as compared to competitive group of nickel-based superalloys, exhibit high strength for high deformation velocity at elevated temperature, high resistance to oxidation and carburization at elevated temperature, and much better fatigue strength (they crack more slowly than other intermetallic phase-based alloys). However, common application of these alloys meets, quite a few technological drawbacks mainly related to insufficient plasticity and a tendency to brittle cracking [1, 2]. Additionally, Ni3Al-based alloys can be used in the form of honeycomb structures, which have an advantage in lightweight, highstiffness and high-strength over bulk Ni-based superalloys. Thus far, we have successfully fabricated Ni3Al thin foils by cold rolling of commonly casted ingots without any additional treatment. The proposed technology allows to obtain foils with thickness even below 50 μm and with micro- and nanograined structure [3, 4]. Methanol is expected to become an alternative energy source (a fuel) in the near future. It can be easily synthesized from biomass, natural gas, coal etc., which are more abundant resources than crude oil [8, 9]. Hexane, as the second analyzed compound in this field of research, is a component of many products related to the petroleum and gasoline industries. Nevertheless, as an effect of these applications, increasing amount of this compound is released to the atmosphere and possibility of hexane deactivations is important for environmental pollution reducing. Above mentioned mechanical properties of Ni3Al thin foils, and their additional good catalytic properties without any coating, allow to build microscale power sources and microreactors for air purification (e.g. MEMS, MECS) [3, 4]. The main purpose of this work was an assessment of catalytic effects observed while thermodecomposition reactions of methanol and hexane run over Ni3Al foil surface. Preli[...]

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