Increasing of functionality of c.p. titanium/UHMWPE tribo-pairs by thermodiffusion nitriding of titanium component

Pohrelyuk, І. М.; Sheykin, Sergiy; Dub, S. N.; Mamalis, A.G.; Rostotskii, I. Yu.; Ткачук, О. В.; Lavrys, S. М.

doi:10.1016/j.biotri.2016.08.002

Cited by 14 publications

(6 citation statements)

References 18 publications

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“…The implant components are made of the following materials: femoral head 2 -thermodiffusion nitrided (TDN) titanium GRADE 2 [27],…”

Section: Solution Problem and Resultsmentioning

confidence: 99%

Predictive Assessment of Maximum Contact Pressures in Metal-on-Polymer Hip Joint Implants by Analytical Method and FEM

Chernets¹,

Chernets²

2023

Tribol. Ind.

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In more than 90% of hip replacements, the acetabular cup is made of ultra-high molecular weight polyethylene (UHMWPE) and the femoral head is made of stainless steel, cobalt-chromium-molybdenum alloys, titanium or ceramic. The primary factor in evaluating soft-on-hard endoprostheses is the maximum contact pressure as the contact strength of UHMWPE. The level of these pressures is used as a criterion for the correct selection of the femoral head size and radial clearance in the connection during arthroplasty for a specific patient. According to the previously developed new analytical method is proposed for estimating maximum contact pressures in thermo-diffusion nitrided (TDN) titanium GRADE 2 – UHMWPE hip joint implant. The effects of implant femoral head diameter and radial clearance on maximum contact pressures are determined for the average load. Relationships between maximum contact pressures and the above-mentioned parameters are established. A comparison is made between maximum contact pressures estimated by the proposed analytical method and numerical analysis with ANSYS (2D and 3D). The maximum contact pressures calculated using the 2D model have been found to be the lower limit, and the pressures calculated using the 3D model in ANSYS are the upper limit for analytical calculations. Therefore, it should be expected that at thickness of cup ˜ 7…8 mm the contact stresses will not be significantly different than those obtained from the solution by the above method. The developed analytical method can be effectively used for research not only soft-on-hard endoprostheses (metal-on-polymer, ceramics-on-polymer), but also hard-on-hard endoprostheses (metal-on-metal, ceramics-on-ceramics). The results of analytical calculations were also related to the results of FEM calculations known in the literature and their convergence was established.

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“…The implant components are made of the following materials: femoral head 2 -thermodiffusion nitrided (TDN) titanium GRADE 2 [27],…”

Section: Solution Problem and Resultsmentioning

confidence: 99%

Predictive Assessment of Maximum Contact Pressures in Metal-on-Polymer Hip Joint Implants by Analytical Method and FEM

Chernets¹,

Chernets²

2023

Tribol. Ind.

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“…Therefore, the wear resistance of titanium is a limiting factor for its use as a bearing material in articulated joint implants. There are many methods for increasing wear and fretting resistance of titanium [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], among which diffusion methods (thermochemical treatment) [11][12][13][14][15][16][17] are attractive. This is explained by the fact that these methods are technologically simple and provide stable physicochemical and mechanical characteristics of the treated surface.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Friction Behaviour of Titanium Grade 2 after Non-Contact Boriding in Oxygen-Containing Medium with Gas Nitriding

et al. 2023

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The surface characteristics and friction behaviour of titanium Grade 2 with modified nitride (TiN, Ti2N) and boride (TiB) compound layers were investigated. It was shown that during non-contact boriding in oxygen-containing medium of titanium, the diffusion processes take place mainly by the interscale mechanism; however, during nitriding, besides the traditional interscale diffusion mechanism, the grain boundary mechanism of diffusion of nitrogen atoms is also realized. The optimal set of surface roughness parameters (height and step parameters, a combination of kurtosis and asymmetry, and profile reference curve parameters) was obtained after boriding. It was determined that the intensity of the adhesive wear of the tribo-pairs with stainless steel and ultrahigh molecular weight polyethylene under dry sliding conditions was influenced not only by the hardness but also roughness of the modified surface layer. The lowest friction coefficient was fixed for the TiB compound layer in both tribo-pairs.

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“…The complex of characteristics of products made of these materials essentially depends on the properties of their surface layer [4][5][6]. An effective method of strengthening them is thermal diffusion saturation with elements of embodiment, in particular, nitrogen, oxygen or carbon [7][8][9]. The interaction of titanium with these elements at high temperatures is accompanied not only by the formation and growth of a nitride, oxide or carbide film, but also by a significant dissolution of nitrogen, oxygen and carbon in the metal.…”

Section: Introductionmentioning

confidence: 99%

Study of titanium oxidation kinetics at temperature above polymorphic transformation

Trush

Luk’yanenko

Fedirko

2021

TAPR

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The object of research is the analytical description of the phenomena in the near-surface layer, which are caused by the interaction of titanium with oxygen at high temperatures. These are temperatures that exceed the polymorphic transformation of the metal. High-temperature oxidation gives titanium products unique performance properties. Of course, such characteristics are determined, first of all, by the state of the near-surface layer. Therefore, an understanding of oxidation processes will make it possible to predict the state of the near-surface layer after heat treatment. However, to date, no unified approach has been created to describe the mechanism and kinetics of high-temperature oxidation of titanium in the near-surface layer. Indeed, most of the existing approaches make it possible to predict the nature of oxidation in the bulk of the metal. Some scientific papers describe the kinetics of oxidation, taking into account only the formation and growth of oxide layers. However, simultaneously with oxide formation, a diffusion zone is formed, which significantly affects the kinetics. Therefore, today one of the most problematic areas of high-temperature titanium oxidation is the description of the processes that take place in the near-surface layer. In this work, to describe the kinetics of high-temperature oxidation of titanium, in addition to the formation and growth of the oxide layer, the formation and growth of the diffusion zone is taken into account. In the diffusion zone, under the influence of structural phase transformations, solid solutions of oxygen are formed in the alpha and beta phases. This approach made it possible to take into account additional factors and thereby more accurately describe the processes of high-temperature oxidation of titanium. As a result of the calculations, the thickness of the oxide layer of the diffusion zone is given depending on the oxygen concentration and the duration of treatment. And also the dependences of the kinetics of displacement of the boundary of the oxide-diffusion layer are given and a system of equations for calculating the ratio of the formed phase components is developed. Thanks to the proposed analytical approach, it will be possible to calculate the sizes of interphase boundaries on the basis of temperature-time parameters and oxygen concentration and thereby form a hardened near-surface layer with certain functional properties

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Increasing of functionality of c.p. titanium/UHMWPE tribo-pairs by thermodiffusion nitriding of titanium component

Cited by 14 publications

References 18 publications

Predictive Assessment of Maximum Contact Pressures in Metal-on-Polymer Hip Joint Implants by Analytical Method and FEM

Predictive Assessment of Maximum Contact Pressures in Metal-on-Polymer Hip Joint Implants by Analytical Method and FEM

Comparison of Friction Behaviour of Titanium Grade 2 after Non-Contact Boriding in Oxygen-Containing Medium with Gas Nitriding

Study of titanium oxidation kinetics at temperature above polymorphic transformation

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