Kinetic and Thermodynamic Aspects of High-Temperature Oxidation of Selected Ti-Based Alloys

Dalibor Vojtech; M. Mort'aniková; Pavel Novák

doi:10.4028/www.scientific.net/DDF.263.123

Paper Titles

The Thermodynamic Database for the Development of Modern Lead-Free Solders
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Thermodynamic Properties of Liquid Binary Transition-Metal Alloys in the Bretonnet-Silbert Model
p.105

Steam Oxidation Behaviour of Ni-Based Single Crystalline Superalloy for the Advanced Gas Turbine
p.111

The Effect of Oxide Cracks on Hydrogen Ingress in ZrO₂
p.117

Kinetic and Thermodynamic Aspects of High-Temperature Oxidation of Selected Ti-Based Alloys
p.123

The BFS Method Combined with Chemical Cluster Interactions for the Study of Order-Disorder Transitions
p.129

Thermodynamic Aspects of Diffusion Paths in Ternary Systems
p.135

The Influence of Thermodynamic Properties of Alloys on Effective Interdiffusion Coefficients in Ternary Systems
p.141

Iron-Based Nanocomposite Synthesised by Microwave Plasma Decomposition of Iron Pentacarbonyl
p.147

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Kinetic and Thermodynamic Aspects of High-Temperature Oxidation of Selected Ti-Based Alloys

Abstract:

In the presented work, high-temperature cyclic oxidation of pure Ti, Ti-7.8wt.%Si, Ti- 45.6wt.%Al and Ti-11.7wt.%Al-7.2wt.%Si alloys at 750 – 1050 °C in air were studied. It was found that both Si and Al strongly reduce the oxidation rate of titanium, mainly up to 850 °C. They incorporate into the oxide scales and reduce penetration rate of oxygen towards the metallic substrate. Mechanism of the barrier effects of the elements is discussed with respect to their distribution in alloys. It was observed by comparison of Al-containing and Si-containing alloys, that the influence of Si on the oxidation kinetics is significantly stronger. It can be supposed that a synergic effect of silicon and nitrogen is a reason for this behavior.