The Influence of Thermal Oxidation Parameters on Structural, Friction, and Wear Characteristics of Oxide Layers Produced on the Surface of Ti–6Al–7Nb Alloy

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Krzysztof Aniołek ◽  
Adrian Barylski ◽  
Marian Kupka ◽  
Joanna Tylka
Keyword(s):  
Oxide Scale ◽  
Thermal Oxidation ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Fourfold Increase ◽  
Resistance To Sliding ◽  
Developed Surface ◽  
Biomedical Titanium Alloy ◽  
Oxide Particles ◽  
Oxidation Parameters

The effects of thermal oxidation of a biomedical titanium alloy (Ti–6Al–7Nb) on its morphology, structure, mechanical properties, and sliding friction and wear against alumina were investigated. It was found that at 600 °C, the surface of the alloy was characterized with a thin inhomogeneous oxide scale. Increasing the temperature of oxidation to 700 °C and 800 °C allowed obtaining homogeneous layers, which fully covered the examined surfaces. By contrast, the oxide scale obtained at 800 °C was composed of big oxide particles with a developed surface. Thermal oxidation process allows a fourfold increase in the hardness of Ti–6Al–7Nb alloy. It was shown that the oxide scale on the examined alloy efficiently enhances its resistance to sliding wear against alumina.

scholarly journals THE INFLUENCE OF ISOTHERMAL OXIDATION PARAMETERS ON THE TRIBOLOGICAL PROPERTIES OF TITANIUM

Tribologia ◽  
2017 ◽  
pp. 5-9 ◽  
Author(s):  
Krzysztof ANIOŁEK ◽  
Adrian BARYLSKI ◽  
Marian KUPKA ◽  
Michał DWORAK
Keyword(s):  
Thermal Oxidation ◽  
Tribological Properties ◽  
Sliding Wear ◽  
Isothermal Oxidation ◽  
Oxide Layers ◽  
Wear Analysis ◽  
Resistance To Sliding ◽  
Oxide Particles ◽  
Titanium Grade ◽  
Oxidation Parameters

The paper presents the results of tests concerning the tribological properties of titanium Grade 2 subjected to thermal oxidation at a temperature of 600°C and 700°C for 72 hours. Morphology of the obtained oxide scale was determined using a scanning electron microscope. After oxidation at 600°C, the resultant oxides concentrated mostly on the roughness elevations formed during the grinding of samples. On raising temperature to 700°C, finer and more agglomerated oxide particles were formed. Tribological tests have shown that titanium Grade 2 in a non-oxidised condition is characterised by very poor resistance to sliding wear. It has been found that the presence of an oxide layer on the surface of titanium significantly improves its poor tribological properties. Oxide layers obtained at temperatures of 600°C and 700°C allowed obtaining as much as a triple reduction of volumetric wear. Analysis of the morphology of the wear trace surface has shown the presence of corrugation wear on a non-oxidised specimen in the form of two alternate regions with different morphologies. It has been demonstrated that oxide layers obtained during thermal oxidation eliminate the phenomenon of corrugation wear.

scholarly journals Characteristics of the tribological properties of oxide layers obtained via thermal oxidation on titanium Grade 2

2018 ◽  
Vol 233 (1) ◽  
pp. 125-138 ◽  
Author(s):  
Krzysztof Aniołek ◽  
Marian Kupka ◽  
Adrian Barylski
Keyword(s):  
Thermal Oxidation ◽  
Oxide Layer ◽  
Tribological Properties ◽  
Sliding Wear ◽  
Electron Microscopic ◽  
Effective Technique ◽  
Resistance To Sliding ◽  
Scanning Electron Microscopic ◽  
Oxide Particles ◽  
Titanium Grade

Thermal oxidation is an effective technique for modifying the surface of titanium and its alloys in order to improve their poor tribological properties. This paper presents the results of tests concerning titanium Grade 2 subjected to thermal oxidation at 600 ℃ and 700 ℃ for 72 h. The morphology of the surface of the formed oxide scale was determined. The surface of a specimen oxidised at 600 ℃ was unevenly covered by very fine oxide particles. Raising the temperature to 700 ℃ made it possible to cover the entire examined surface with an oxide layer. The obtained scale was characterised by the presence of large irregularly shaped agglomerated oxide particles. Tribological tests showed that the presence of an oxide layer on the surface of titanium significantly improved the resistance of the interacting tribological couple to sliding wear. The obtained 3D isometric images of the trace of wear showed that the formed traces differed in terms of width, depth and shape. It was shown that the area of the cross section of the trace of wear decreased as the temperature of thermal oxidation increased. Scanning electron microscopic observations of traces of wear formed following tribological interaction with an Al2O3 ball showed, in a non-oxidised specimen and a specimen oxidised at 600 ℃, the presence of alternating morphologically varied areas formed as a result of corrugation wear. The oxide layer obtained at 700 ℃ has the highest resistance to sliding wear and completely eliminates the adverse corrugation wear phenomenon.

scholarly journals Friction and Wear of Oxide Scale Obtained on Pure Titanium after High-Temperature Oxidation

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3764
Author(s):  
Krzysztof Aniołek ◽  
Adrian Barylski ◽  
Marian Kupka
Keyword(s):  
High Temperature ◽  
Oxide Scale ◽  
High Temperature Oxidation ◽  
Friction And Wear ◽  
High Carbon Steel ◽  
Oxide Films ◽  
Oxidation Temperature ◽  
Temperature Oxidation ◽  
Wear Ratio ◽  
Steel Balls

High-temperature oxidation was performed at temperatures from 600 to 750 °C over a period of 24 h and 72 h. It was shown in the study that the oxide scale became more homogeneous and covered the entire surface as the oxidation temperature increased. After oxidation over a period of 24 h, the hardness of the produced layers increased as the oxidation temperature increased (from 892.4 to 1146.6 kgf/mm2). During oxidation in a longer time variant (72 h), layers with a higher hardness were obtained (1260 kgf/mm2). Studies on friction and wear characteristics of titanium were conducted using couples with ceramic balls (Al2O3, ZrO2) and with high-carbon steel (100Cr6) balls. The oxide films produced at a temperature range of 600–750 °C led to a reduction of the wear ratio value, with the lowest one obtained in tests with the 100Cr6 steel balls. Frictional contact of Al2O3 balls with an oxidized titanium disc resulted in a reduction of the wear ratio, but only for the oxide scales produced at 600 °C (24 h, 72 h) and 650 °C (24 h). For the ZrO2 balls, an increase in the wear ratio was observed, especially when interacting with the oxide films obtained after high-temperature oxidation at 650 °C or higher temperatures. The increase in wear intensity after titanium oxidation was also observed for the 100Cr6 steel balls.

scholarly journals Sliding friction and wear performance of the nano-bioceramic α-Al2O3 prepared by high energy milling

2015 ◽  
Vol 91 ◽  
pp. 151-159 ◽  
Author(s):  
Mamoun Fellah ◽  
Mohammed Abdul Samad ◽  
Mohamed Labaiz ◽  
Omar Assala ◽  
Alain Iost
Keyword(s):  
Friction And Wear ◽  
Sliding Friction ◽  
High Energy ◽  
Wear Performance ◽  
High Energy Milling ◽  
Α Al2o3
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