Article
Kinetics of high-temperature oxidation of (Ti,Ta)(CN)-based cermets
Author/s | Chicardi Augusto, Ernesto
Córdoba Gallego, José Manuel Gotor Martínez, Francisco José |
Department | Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y el Transporte |
Publication Date | 2016 |
Deposit Date | 2018-04-09 |
Published in |
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Abstract | The kinetics of the high-temperature oxidation of titanium–tantalum carbonitride-based cermets with different Ti/Ta ratios was studied. Isothermal oxidation tests were conducted under static air for 48 h at temperatures ... The kinetics of the high-temperature oxidation of titanium–tantalum carbonitride-based cermets with different Ti/Ta ratios was studied. Isothermal oxidation tests were conducted under static air for 48 h at temperatures between 700 °C and 1200 °C. The oxidation satisfied the parabolic kinetics, characteristic of the existence of a protective oxide layer. The apparent activation energy suggests the rate-controlling process during oxidation is the simultaneous inward and outward diffusion of oxygen and titanium, respectively, through the formed protective layer, consisting mainly of a rutile phase. A higher Ta(V) content in the rutile decreased the oxygen diffusivity due to the reduction of oxygen vacancy concentration. |
Funding agencies | Gobierno de España |
Project ID. | MAT2011- 22981 |
Citation | Chicardi Augusto, E., Córdoba Gallego, J.M. y Gotor Martínez, F.J. (2016). Kinetics of high-temperature oxidation of (Ti,Ta)(CN)-based cermets. Corrosion Science, 102, 168-177. |
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