Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: M. Godlewska x
  • All content x
Clear All Modify Search

Abstract  

DSC measurements were carried out for [Ni(H2O)6](ClO4)2 (sampleH) and [Ni(D2O)6](ClO4)2 (sampleD) in the temperature range 300–380 K. For both compounds two anomalies on the DSC curves were detected. The results for sampleH are compared to those previously obtained using adiabatic calorimetry method. For both compounds studied in this work the high-temperature transition appears at the same temperature while the low-temperature one is shifted towards higher temperatures in sampleD. Disorder connected with H2O or D2O groups is suggested in the intermediate phase between the low- and high-temperature transitions.

Restricted access

Abstract  

A Ti–45.9Al–8Nb (at%) alloy with a lamellar structure (γ+α2) was oxidised in air at 700, 800, 850 and 900°C in isothermal and thermal cycling conditions. The reaction progress was followed by thermogravimetric measurements. In isothermal conditions the oxidation kinetics followed approximately a parabolic rate law and the rate constants ranged from about 10–12 kg2 m–4 s–1 at 700°C to 10–10 kg2 m–4 s–1 at 900°C. The oxide scales were built of Al2O3 and TiO2, the former being the main component of the outermost layer. The oxidation behaviour of Ti–45.9Al–8Nb was referred to a commercial titanium alloy, WT4 (Ti–6Al–1Mn), and selected oxidation-resistant alloys.

Restricted access