Effect of alternating current field on powder oxidizing of commercially pure titanium TA2

doi:10.13251/j.issn.0254-6051.2023.02.044

Abstract

Abstract: Alternating current field (ACF) enhanced powder oxidizing was carried out on commercially pure titanium TA2 at 650 ℃ by applying ACF to pack agents and specimen with a pair of electrodes paralleling with each other set in a process container. The results show that the surface layer, produced by the oxidizing with carbamide as oxygen supplier in the pack agent, consists of mainly TiO₂ with few Ti₂N and α-Ti with dissolved oxygen. ACF can greatly enhance the oxidizing of TA2. The oxidized layer thickness and hardness increase with the increase of ACF current, which modifies the hardness distribution along the layer depth. After oxidizing for 6 h with pack agent containing 2% carbamide and the ACF with a current of 2 A, an oxidized layer is obtained with thickness of 46 μm and peak hardness of 1150 HV0.01. It is proposed that the ACF's physical effect of enhancing chemical reactions in the agent increases the productivity and activity of oxygen atoms or active oxygen-containing species. By increasing the vacancy concentration in the specimen, the ACF provides more channels for the diffusion of oxygen atoms. These two factors accelerate the diffusion of oxygen atoms into the specimen. This new oxidizing technology can carry out high-efficient oxygen infiltration treatment on titanium at a lower temperature and reduce workpiece distortion.

Key words: commercially pure titanium TA2, powder oxidizing, alternating current field, surface modification

CLC Number:

Wang Xinyu, Xie Fei, Pan Jianwei. Effect of alternating current field on powder oxidizing of commercially pure titanium TA2[J]. Heat Treatment of Metals, 2023, 48(2): 284-288.

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