Abstract
Oxidation resistance behavior of titanium matrix composites (TMCs) reinforced by carbon nanotubes (CNTs) at elevated temperature was investigated by thermogravimetric analysis method under air atmosphere. The results showed that the phase transformation during the oxidation process of Ti-0.2 wt% CNTs composite is divided into two stages in the following order: Ti→TiO(Ti3O) and TiO(Ti3O)→TiO2. Sharp analysis showed that the oxidation stage from Ti to TiO(Ti3O) is described by A3 function with 3D Avrami-Erofeev (A-E) equation and the subsequent stage to TiO2 is ascribed to the F1 function with 1D phase boundary reaction in the later stage. The responsibility of CNTs on the oxidation resistance of the Ti matrix is mainly reflected in second stage. The elevated temperature favors the first stage of the oxidation process and inhibits the reaction rate of the second stage. An oxidation kinetic model based on the oxidation steps and function mechanism was proposed to describe the oxidation behavior of Ti-0.2 wt% CNTs composite.
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