Abstract
The kinetic parameters of TiB2 powders oxidation of different dispersions were estimated by Coats–Redfern and Ozawa–Flynn–Wall methods. Based on the isoconversional method, it was found that the investigated reaction is most likely of the fractional order and the activation energy E A dependence during the oxidation reaction is of the complicated behavior. Using the Coats–Redfern method the E A values were estimated for four temperature ranges: E A ≅ 300–400 kJ/mol (<750 K, α ≅ 5–7 %), 190 kJ/mol (750–820 K), 75 kJ/mol (820–1,000 K), and E A ≅ 16…26 kJ/mol (1,000–1,400 K) at high α values. A thickness, composition, and microstructure of the scale are changing continuously with temperature (T) increase. These changes lead to the variations of the mechanism of the oxygen diffusion transport to the reaction area.
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The work supported by the Russian Foundation for Basic Research (RFBR) Ref. No. 14-03 31184.
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Blokhina, I.A., Ivanov, V.V. Analysis of TiB2 powders oxidation in the air. J Therm Anal Calorim 119, 123–130 (2015). https://doi.org/10.1007/s10973-014-4196-2
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DOI: https://doi.org/10.1007/s10973-014-4196-2