Forming carbonitride coatings on titanium by thermochemical treatment with C-N-O-containing media

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

doi:10.1007/s11837-007-0075-7

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…A hard TiN coating not only improves surface properties but also provides decorative colors on the surface [3]. In this study, the gas nitriding method was used to create titanium nitride coatings by thermochemically treating titanium alloys with a N-containing gas [4]. This technique takes advantage of the high reactivity of titanium with nitrogen to produce hardened surface layers that are well bonded to the tough matrix, and is low cost.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of nitride layers formed on Ti-6Al-4V alloys by gas nitriding

et al. 2011

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Ti-6Al-4V alloys were nitrided through gas nitriding at 950°C for 3 h in deoxygenated, atmospheric nitrogen gas. During nitriding, nitrogen reacted and diffused into the alloys to form Ti2N and a meager amount of TiN in a Ti-N compound layer with a thickness of 20 µm to 25 µm. An α-Ti(N) diffusion layer with a thickness of 40 µm to 80 µm formed below this layer. A small amount of Al was dissolved at the top of the Ti-N compound layer because of the strong interaction of nitrogen with Ti and Al. Nitriding resulted in the dissolution of interstitial nitrogen and the formation of nitrides. Oxidation of the nitrided Ti-6Al-4V alloys initially resulted in the formation of a Ti-N-O layer, which later oxidized to TiO2. Above 800°C, the nitrided alloys oxidized rapidly, accompanied by microcracking of the TiO2 surface layer.

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Section: Introductionmentioning

confidence: 99%

Oxidation of nitride layers formed on Ti-6Al-4V alloys by gas nitriding

et al. 2011

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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%

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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“…It should be noted that forming of these nitride layers gives new possibilities in surface engineering of titanium alloys, in particular, at the complex modification of surface layers by the interstitial elements (Pohreliuk et al, 2007;Pohrelyuk et al, 2009Pohrelyuk et al, , 2011Yaskiv et al, 2011;Fedirko et al, 2009). Thus, at thermocycling the nitriding process of titanium is intensified and reaches the maximum during processing in area of  transition.…”

Section: Nitriding Of Titanium Alloys At Thermocyclingmentioning

confidence: 99%