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Abstract
To improve the strength properties, adhesion, and the thermal cycling resistance of ceramic coatings, the titanium alloy surface was modified with copper ions under different processing times. It is found that at the maximum processing time, the thickness of the alloyed layer reaches 12 μm. It is shown that the modified layer has a multiphase structure in addition to the main α and β–titanium phases with the intermetallic compounds of the Ti-Cu system. The parameters of the fine structure of the material are investigated by the X-ray diffraction analysis. It has been found that when the surface of the titanium alloy is modified, depletion occurs in the main alloying elements, such as aluminum and vanadium, the crystal lattice parameter increases, the root-mean-square (rms) displacements of the atoms decrease, and the macrostresses of compression arise. A multilevel micro- and nanoporous nanocrystalline structure occurs, which leads to an increase in the adhesion and the thermal cyclic resistance of the ceramic coating based on Si-Al-N.
Highlights
The VT23 alloy is related to the Ti-Al-V-Mo-Cr-Fe system
The VT23 alloy modified with coppercomposition ions at different processing times diffraction analysis
It is seen0.8–1.4 that the X-ray diffraction of the initial titanium alloy contain the lines of α and β-phases of titanium, which are characteristic of the quenched VT23 alloy
Summary
The VT23 alloy is related to the Ti-Al-V-Mo-Cr-Fe system. This is a medium-alloyed (α + β) martensitic-class alloy, which gets the martensitic "α” structure after hardening from the β-region.This alloy has high ductility, which is an important property for technological applications such as drawing, flanging, and other pressure treatment operations [1].This property of the titanium alloy allows using it as the basis for deposition of heat-shielding coatings such as Zr-Y-O, Si-Al-N [2,3,4,5,6]. This is a medium-alloyed (α + β) martensitic-class alloy, which gets the martensitic "α” structure after hardening from the β-region This alloy has high ductility, which is an important property for technological applications such as drawing, flanging, and other pressure treatment operations [1]. It is known that across the substrate surface adjacent to the coating, there is a sharp jump in the change in the structural phase state and the physical and mechanical properties of the "heat-protective coating—substrate" system. In this interface region, there appears the maximum localization of the elastic stress. The state of the substrate surface can significantly affect the formation of the structure and the properties of the coating itself [14,15]
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