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Abstract
A composite coating composed of intermetallic compounds, Al–Si alloys, and an oxide ceramic layer was prepared on TA2 substrate by hot-dipping Al–Si alloy and micro-arc oxidation (MAO) methods. The microstructure and composition distribution of the resulting hot-dipped Al–Si alloy layer and MAO-caused ceramic layer were studied by scanning electron microscope (SEM) and energy dispersive spectrum (EDS). In addition, the phase composition of the diffusion layer obtained by the Al–Si alloy hot-dipping procedure was investigated by electron backscattered diffraction (EBSD), and the phase structure of the MAO-treated layer was studied by X-ray diffraction (XRD) analysis and X-ray photoelectron spectroscopy (XPS). The MAO method can make the hot-dipped Al–Si alloy layer in-situ oxidized to form a ceramic layer. Finally, a three-layer composite coating composed of a diffusion layer formed by the Ti–Al–Si interdiffusion, an Al–Si alloy layer and a ceramic layer was prepared on TA2 substrate. Compared with TA2 substrate, the TA2 sample with a three-layer composite coating has larger friction coefficient and less abrasion loss. The three-layer composite coating can significantly improve the wear resistance of TA2. A technical composite method was developed to the low cost in-situ growth of alumina-based ceramic wear-resistant coatings on TA2 substrate.
Highlights
Titanium alloys have been widely used in the aviation, aerospace, chemical, and biomedical sectors owing to their excellent specific strength, corrosion resistance, and biocompatibility [1,2,3,4]
The resulting Al–Si layer had a two-layer structure; the outer layer was an Al–Si alloy layer, and the inner layer was a diffusion layer formed by the interdiffusion of the Al, Si, and Ti elements
It exhibited a small amount of micropore defects and white precipitated products, which mainly existed in the form of sheets or strips that were distributed longitudinally along the cross-section of the Al–Si layer
Summary
Surface techniques can improve the wear resistance, oxidation resistance, biocompatibility, the electrical insulation, and the infrared emission of titanium alloy. The surface coating technology of titanium alloy is a recent research hotspot, and various surface technologies are used to improve the surface properties of titanium alloys. Alumina-based ceramics exhibit high hardness, wear resistance, and good electrical insulation properties. Alumina-based ceramic coatings are deposited on titanium alloy surfaces in order to improve their wear resistance and to electrically insulate the titanium alloy surfaces. The various advanced surface techniques for alumina-based ceramic coatings on titanium alloy are thermal spraying, laser cladding, sol–gel, electron beam remelting, and cathode plasma electrolytic deposition.
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