Formation of functional coatings based on interstitial compounds on titanium under the conditions of thermodiffusion saturation

Fedirko, V. М.; Pohrelyuk, І. М.; Yas’kiv, О. І.

doi:10.1007/s11003-006-0083-8

Cited by 15 publications

(18 citation statements)

References 6 publications

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“…It appears then promising to combine them in the form of a mixed interstitial compound or as solid solutions in titanium. According to Fedirko [17], the ternary compounds have higher hardness and wear resistance than any of the binary compounds. Unfortunately, all these high temperature processes can significantly impact the microstructure and properties of the core material [18].…”

Section: -Contextmentioning

confidence: 99%

Surface engineering of titanium by multi-interstitial diffusion using plasma processing

et al. 2020

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Titanium and its alloys possess a range of highly interesting properties such as excellent corrosion resistance, high specific strength and biocompatibility, but suffers from poor wear resistance. The present work addresses plasma assisted surface treatment of CP 2 titanium using various combinations of oxygen and nitrogen, i.e. mixed interstitials. The sequence of controlled plasma nitriding and oxidizing treatments plays a significant role for the evolution of the hardness depth profiles and the development of the surface compound layer and the underlying diffusion/transition zone. Composition profiles of oxygen and nitrogen are obtained by GDOES; Mixed interstitial solubility of nitrogen and oxygen is found in both h.c.p. α titanium and in the compound layer. The combination of interstitials leads to larger case depth, in particular for the diffusion zone (expanded h.c.p. α titanium). Therefore, it highlights the advantages of combined nitriding and oxidizing compared to single nitriding treatments on the mechanical properties.

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Section: -Contextmentioning

confidence: 99%

Surface engineering of titanium by multi-interstitial diffusion using plasma processing

et al. 2020

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“…N-C-Ti) are also widely used for coatings by PVD/CVD methods. Thermochemical treatment applying two interstitials have been suggested to hold promise by Fedirko et al due to the favorable properties that can be obtained [26,27]. The Ti system is particularly interesting as substitution of interstitial elements is possible between the oxides, nitrides and carbides; i.e.…”

Section: Surface Hardening Of Titaniummentioning

confidence: 99%

“…The mixed-interstitial compounds and solid solutions have physicochemical properties significantly different from those of the binary compounds and solutions. The ternary compounds have higher hardness, wear resistance, corrosion resistance, thermal resistance and radiation resistance than the binary compounds [26]. In a recent publication on (largely uncontrolled) pack cementation treatment, which essentially is a gas process, Bailey and Sun showed that a network layer of TiC could be formed on top of a Ti(O) diffusion zone [29].…”

Section: Surface Hardening Of Titaniummentioning

confidence: 99%

Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy

Gammeltoft-Hansen

Munch

Jellesen

et al. 2017

Materials Performance and Characterization

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Thermochemically treated titanium grade 2 and 5 were investigated by light optical microscopy and hardness indentation. Gaseous oxidation in oxygen and N2O containing atmospheres resulted in a diffusion zone of oxygen in solid solution in titanium with a hardness up to 1000HV. A surface scale consisting of oxide can be present depending on the treatment conditions. A new type of carbo-oxidation treatment was applied, where carbon and oxygen are simultaneously incorporated into the surface. This resulted in new microstructural features such as a deep zone of mixed interstitial solid solution, i.e. a diffusion zone, and surface regions consisting of a mixed interstitial compound (TiCXO1-X structure). Carbo-oxidation yields hardness values in excess of 2500 HV in the mixed interstitial compound and values up to 1500 HV in the diffusion zone. Simultaneously, with the surface hardening treatment, core hardening of the material can be obtained.

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“…This can be alleviated by surface hardening of Ti by incorporation of interstitial elements, C, N and/or O, in the h.c.p. α crystal structure and via formation of interstitial compounds ( [1], [2], [3]). The solubility of carbon in α is maximally 0.08 wt% at 800 °C [4], higher contents entail formation of NaCl type δ carbide.…”

Section: Introductionmentioning

confidence: 99%

Gaseous thermochemical synthesis and characterization of mixed interstitial phases in the Ti-C-O system

Kværndrup¹,

Dahl²,

Ståhl³

et al. 2020

MATEC Web Conf.

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Titanium grade 2 thin foils were carbo-oxidized at 800 °C in a thermogravimetric analyzer in CO gas for 20 - 100 hours. The synthesized thin foils were characterized by infrared carbon determination for composition analysis, transmission X-ray diffraction (XRD), light optical microscopy (LOM) and nanoindentation. Thermodynamic equilibrium predictions were performed using ThermoCalc. Oxygen and carbon expanded h.c.p. α and NaCl type δ carbo-oxide were identified from the XRD patterns. Rietveld refinements of the XRD patterns revealed an increase in expansion of the h.c.p. α lattice from interstitially dissolved C and O: the c/a ratio increases from 1.588 for interstitially free h.c.p. α to 1.607 after 100 hours of exposure. The overall carbon and oxygen content after 100 hours was 4.2 wt% and 5.5 wt%, respectively; these overall compositions correspond to the two-phase α + δ region in the calculated ternary phase diagram. The microstructure from LOM revealed large grains of expanded α-phase and a surface zone consisting of porous δ carbo-oxide. The hardness, as determined by indentation, of the expanded α increased linearly with the c/a ratio, resulting in an increase to 11748 MPA after 100 hours exposure from 2193 MPa for the untreated Ti grade 2.

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Formation of functional coatings based on interstitial compounds on titanium under the conditions of thermodiffusion saturation

Cited by 15 publications

References 6 publications

Surface engineering of titanium by multi-interstitial diffusion using plasma processing

Surface engineering of titanium by multi-interstitial diffusion using plasma processing

Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy

Gaseous thermochemical synthesis and characterization of mixed interstitial phases in the Ti-C-O system

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