Oxidation and diffusion processes during annealing of TiSi(V)N films

Fernandes, Filipe; Morgiel, J.; Polcar, Tomáš; Cavaleiro, A.

doi:10.1016/j.surfcoat.2015.05.031

Cited by 27 publications

(6 citation statements)

References 35 publications

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“…At the same time, the introduction of gold into the oxide layer changed the surface phase constituents and improved the mechanical properties, and therefore it is worthwhile to discuss the mechanism of the pre-deposited gold in the CCT of titanium alloys. Thanks to the high a nity of Ti for O, the oxidation of titanium alloys is dominated by the inward diffusion of O 2− and the outward diffusion of Ti 4+ [19]. In our previous study, we found that with the existence of a gold layer on the surface of the titanium alloy, the outward diffusion of Ti ions is promoted to provide more fresh titanium atoms to react with oxygen [12].…”

Section: : Discussionmentioning

confidence: 98%

Impact of the amount of the gold layer on the tribological performance of the ceramic conversion treated CP-Titanium

Zhang

et al. 2022

Preprint

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Titanium alloys are characterised by poor tribological properties, and a ceramic TiO2 layer formed on the surface can greatly improve its performance. By pre-depositing a gold layer on the titanium surface, the gold particles promote the outward diffusion of titanium in the ceramic conversion treatment to react with the inward-coming oxygen to form a compact titanium dioxide layer. The surface morphology, microstructure, phase constituents were characterised by SEM/EDX and XRD. The adhesion o the oxide layers were assessed by a scratch test. The distribution of gold particles in the oxide layer can enhance the surface hardness and reduce friction and wear against a WC ball in the reciprocal tribological test. The ceramic conversion process can be accelerated efficiently at 620-660°C, and the more gold pre-deposited, the thicker the oxide layer.

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Section: : Discussionmentioning

confidence: 98%

Impact of the amount of the gold layer on the tribological performance of the ceramic conversion treated CP-Titanium

Zhang

et al. 2022

Preprint

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“…They found that the coating degradation mechanism when exposed to 650 • C in a pure steam environment is adverse diffusion of the substrate elements and oxygen through coating growth defects or cracks formed due to thermal expansion coefficient mismatch between the coating and the substrate. Fernades et al [92] also demonstrated that the oxidation of TiSiVN coatings is controlled by the formation of a silicon oxide diffusion barrier which is affected by nodular defects in the as-deposited film. At nodular defects a complex oxide structure was developed.…”

Section: Oxidation Resistancementioning

confidence: 99%

Review of Growth Defects in Thin Films Prepared by PVD Techniques

et al. 2020

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The paper summarizes current knowledge of growth defects in physical vapor deposition (PVD) coatings. A detailed historical overview is followed by a description of the types and evolution of growth defects. Growth defects are microscopic imperfections in the coating microstructure. They are most commonly formed by overgrowing of the topographical imperfections (pits, asperities) on the substrate surface or the foreign particles of different origins (dust, debris, flakes). Such foreign particles are not only those that remain on the substrate surface after wet cleaning procedure, but also the ones that are generated during ion etching and deposition processes. Although the origin of seed particles from external pretreatment of substrate is similar to all PVD coatings, the influence of ion etching and deposition techniques is rather different. Therefore, special emphasis is given on the description of the processes that take place during ion etching of substrates and the deposition of coating. The effect of growth defects on the functional properties of PVD coatings is described in the last section. How defects affect the quality of optical coatings, thin layers for semiconductor devices, as well as wear, corrosion, and oxidation resistant coatings is explained. The effect of growth defects on the permeation and wettability of the coatings is also shortly described.

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“…The hardened zone under the oxide layer for CCT at 620 • C for 80 h was clearly deeper than that treated for 8 h. This suggested that vanadium only influenced the growth of the oxide layer or the oxygen diffusion in the oxide layer, but did not affect the oxygen diffusion in the substrate. Another impact of vanadium may be attributed to the high solubility of V in the titanium substrate, which facilitated the formation of the Ti(V)O 2 solid solution [21]. The V 3+ ion may replace the position of Ti 4+ ions to produce V-doped TiO 2 , increasing the interstitial Ti 4+ ion content and decreasing the excess electron content to accelerate oxidation.…”

Section: Oxidation Mechanism Of Titanium With Vanadiummentioning

confidence: 99%

Ceramic Conversion Treatment of Commercial Pure Titanium with a Pre-Deposited Vanadium Layer

Zhang,

Deng,

Dong

2023

Metals

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Titanium is characterized by poor wear resistance which restricts its application. Ceramic conversion treatment (CCT) is used to modify the surface; however, it is a time-consuming process. In this work, a thin vanadium layer was pre-deposited on the commercial pure titanium (CPTi) samples’ surface, and it increased the oxygen absorption significantly and assisted in obtaining a much thicker oxide layer than those samples without a V layer at the treatment temperatures of 620 °C and 660 °C. The oxidation of the samples pre-deposited with the V layer had a much higher oxidation rate, and V was evenly distributed in the oxide layer. After CCT, all samples had a low wear volume and stable coefficient of friction in comparison to the untreated CPTi sample. A slightly higher wear area in the wear track was observed on the V pre-deposited samples than those samples without vanadium, especially those with a thicker oxide layer (>4 µm). This might be associated with defects in a thicker oxide layer and insufficient support from a shallower oxygen diffusion zone or hard debris created at the initial stage. Vanadium in the oxide layer reduced the contact angles of the surface and increased the wettability significantly.

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Oxidation and diffusion processes during annealing of TiSi(V)N films

Abstract: The degradation of self-lubricant hard coatings applied in tools for high-speed cutting or dry drilling operations occurs by a combination of wear, oxidation and diffusion. The

Cited by 27 publications

References 35 publications

Impact of the amount of the gold layer on the tribological performance of the ceramic conversion treated CP-Titanium

Impact of the amount of the gold layer on the tribological performance of the ceramic conversion treated CP-Titanium

Review of Growth Defects in Thin Films Prepared by PVD Techniques

Ceramic Conversion Treatment of Commercial Pure Titanium with a Pre-Deposited Vanadium Layer

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