PROPERTIES OF DIAMOND-LIKE CARBON COATINGS ON THE TITANIUM ALLOY Ti13Nb13Zr

Tribologia ◽  
2019 ◽  
Vol 288 (6) ◽  
pp. 39-46
Author(s):  
Monika Madej ◽  
Katarzyna Piotrowska ◽  
Dariusz Ozimina
Keyword(s):  
Titanium Alloy ◽  
Dry Friction ◽  
Vapour Deposition ◽  
Optical Microscope ◽  
Carbon Coatings ◽  
Artificial Blood ◽  
Ringer’S Solution ◽  
Dlc Coating ◽  
Before And After ◽  
The Coefficient Of Friction

The paper discusses the results of experimental research on DLC type diamond coating a-C:H obtained by the technique of physical vapour deposition from PVD on titanium alloy Ti13Nb13Zr. Calotest and an optical microscope were used to determine the thickness of the obtained coating. The nano-hardness of uncoated and with a-C:H coating was determined by the indentation method using a Berkovich indenter. The geometric structure of the surface before and after tribological tests was assessed using a confocal microscope with an interferometric mode. Tests of the resistance of test materials to tribological wear were performed on a tribometer in reciprocating motion under technically dry friction, and friction with lubrication with an artificial blood solution and Ringer’s solution. Tests carried out for the combination of a 6 mm diameter Al2O3 ball-Ti13Nb13Zr titanium alloy disc without and with the DLC coating applied. The results obtained during the tests showed that the use of the DLC coating increases the hardness five times and reduces the friction. In the case of technically dry friction, the coefficient of friction decreased by 70%, the solution of artificial blood by 50%, and in the case of Ringer’s solution by 90%, in comparison with the results obtained for the Ti13Nb13Zr alloy.

scholarly journals Assessment of Mechanical and Tribological Properties of Diamond-Like Carbon Coatings on the Ti13Nb13Zr Alloy

2020 ◽  
Vol 10 (1) ◽  
pp. 536-545
Author(s):  
Katarzyna Piotrowska ◽  
Arkadiusz Granek ◽  
Monika Madej
Keyword(s):  
Synovial Fluid ◽  
Dry Friction ◽  
Physical Vapor Deposition ◽  
Surface Hardness ◽  
Diamond Like Carbon ◽  
Tribological Tests ◽  
Mechanical And Tribological Properties ◽  
Ringer’S Solution ◽  
The Coefficient Of Friction ◽  
Instrumental Indentation

AbstractThe paper presents the results of tests on the geometric structure of the surface, hardness and tribological tests of coatings produced by the method of physical vapor deposition (PVD) on the Ti13Nb13Zr alloy. Hardness was determined using MCT3 from Anton Paar, by instrumental indentation. A diamond indenter with Berkovich geometry was used for the measurement.Model tribological tests were carried out in reciprocating motion under conditions of technically dry friction, friction with lubrication of synovial fluid and Ringer’s solution. The counter-sample in the tested friction nodes was a ball of Al2O3 with a diameter of 6 mm. Nanometer hardness measurements showed that as a result of the diamond-like carbon coating (DLC), the hardness increased by an 7-fold. The lowest friction coefficients among all tested friction nodes were obtained for the material combination Ti13Nb13Zr a-C:H - Al2O3 regardless of the conditions of testing. In the case of technically dry friction, the coefficient of friction decreased by 80%, synovial fluid by 70%, and in the case of Ringer’s solution by 88% compared to the results obtained for Ti13Nb13Zr.

High Temperature Deformation Behavior of a Beta Titanium Alloy for Biomedical Application

2005 ◽  
Vol 475-479 ◽  
pp. 2299-2302 ◽  
Author(s):  
Qing Zhou ◽  
Goroh Itoh ◽  
Hisashi Hasegawa ◽  
Yoshinobu Motohashi ◽  
Mitsuo Niinomi
Keyword(s):  
Titanium Alloy ◽  
Tensile Test ◽  
Biomedical Application ◽  
Rate Sensitivity ◽  
Optical Microscope ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Before And After

The deformation characteristics of a beta-type Ti-29%Nb-13%Ta-5%Zr alloy, developed for biomedical application, and their relation with the microstructure are investigated. The cold-rolled specimen is subjected to a tensile test at high temperatures ranging from 700 to 800°C under a constant cross-head speed ranging from 1×10-4 to 1×10-2s-1. The elongations tested at different temperatures are compared with that of Ti-15%V-3%Cr-3%Sn-3%Al, a typical beta titanium alloy. The deformation mechanism is characterized from the parameter of the strain rate sensitivity. The microstructures before and after the tensile test are observed with optical microscope and the correspondent grain sizes are measured. The grain growth during the deformation is also described.

Study on Surface Structure and Properties of Titanium Alloy Modified by Ion Nitriding

2020 ◽  
Vol 1005 ◽  
pp. 24-28
Author(s):  
Yong Liu ◽  
Xing Sheng Lao ◽  
Chun Hui Dai ◽  
Shi Wei Yao
Keyword(s):  
Titanium Alloy ◽  
Friction Pair ◽  
Surface Hardness ◽  
Structure And Properties ◽  
Friction Test ◽  
Ion Nitriding ◽  
Frictional Properties ◽  
Tc4 Titanium Alloy ◽  
Before And After ◽  
The Coefficient Of Friction

TC4 titanium alloy was treated by ion nitriding. The structure of nitriding layer was analyzed by scanning electron microscopy. The depth and microhardness of nitriding layer were measured. The frictional properties of titanium alloy before and after nitriding were compared by friction test. The results show that the ion nitriding technology can form a stable nitriding layer with a depth of up to 20μm and a surface hardness of 560 HV0.2. At the same time, after nitriding, the wear resistance of the titanium alloy surface is improved. And the coefficient of friction between the friction pair is reduced.

scholarly journals Effect of diamond-like carbon coatings alloying with chromium and molybdenum on the lubricating properties of oils during friction in pair with steel

2021 ◽  
Vol 2059 (1) ◽  
pp. 012004
Author(s):  
I A Buyanovskii ◽  
M M Khrushchov ◽  
V D Samusenko ◽  
M V Atamanov ◽  
Yu I Shcherbakov
Keyword(s):  
Experimental Study ◽  
Magnetron Sputtering ◽  
Dry Friction ◽  
Tribological Behavior ◽  
Tribological Characteristics ◽  
Diamond Like Carbon ◽  
Reactive Magnetron ◽  
Carbon Coatings ◽  
Dlc Coating ◽  
Lubricating Properties

Abstract The results have been presented of an experimental study of the tribological behavior of diamond-like carbon coatings (DLC) doped with chromium and molybdenum obtained by reactive magnetron sputtering. The effect of alloying with these metals on the tribological characteristics of boundary lubrication of a DLC coating/steel contact has been studied for the case of three model lubricants (inactive, surfactant, and chemically active). It has been shown that doping with chromium and molybdenum improves both the tribological characteristics of coatings under dry friction and the lubricating properties of the model oils, while alloying with molybdenum provides lower coefficients of friction and less wear at dry and boundary friction than alloying with chromium.

scholarly journals Determining the Tribological Properties of Diamond-Like Carbon Coatings Lubricated with Biodegradable Cutting Fluids

2017 ◽  
Vol 62 (4) ◽  
pp. 2065-2072 ◽  
Author(s):  
D. Ozimina ◽  
M. Madej ◽  
J. Kowalczyk
Keyword(s):  
Tribological Properties ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Hard Coatings ◽  
Cutting Fluid ◽  
Test Results ◽  
Carbon Coatings ◽  
Before And After ◽  
Zinc Aspartate ◽  
Surface Texture Analysis

Abstract The aim of the study was to determine the effectiveness of the biodegradable cutting fluid used instead of classical, usually toxic. This paper presents the results of tribological studies of a-C:H coatings formed on HS6-5-2C steel by plasma-assisted chemical vapour deposition. The coating structures were examined using a JSM-7100F SEM. The coating microhardness was measured with a Matsuzawa tester. The surface texture analysis was performed before and after the tribological tests with a Talysurf CCI Lite optical profiler. The tribological properties were investigated using a T-01 M tester and a T-17 tester. The tests were carried out under dry friction conditions and lubricated friction conditions using a lubricant with zinc aspartate. The test results show that the layer formed at the interface prevented the moving surfaces. The investigations discussed in this paper have contributed to the development of non-toxic and environmentally-friendly manufacturing because of the use of biodegradable cutting fluid and thin, hard coatings.

TRIBOLOGICAL PROPERTIES OF DIAMON D-LIKE CARBON COATINGS AT FRICTION JOINTS LUBRICATED WITH IONIC LIQUID

Tribologia ◽  
2019 ◽  
Vol 287 (5) ◽  
pp. 59-69
Author(s):  
Krystian MILEWSKI ◽  
Monika MADEJ ◽  
Dariusz OZIMINA
Keyword(s):  
Ionic Liquid ◽  
Tribological Properties ◽  
Dry Friction ◽  
Sliding Friction ◽  
Chemical Vapour ◽  
Carbon Coatings ◽  
Atomic Force ◽  
Coefficient Of Sliding Friction ◽  
Before And After ◽  
Deposition Processes

The paper reports the study of a-C: H and a-C:H:Si diamond-like carbon coatings obtained in plasma-assisted chemical vapour deposition processes PACVD. The influence of the coatings on tribological properties of tribopairs under dry friction and in lubrication with synthetic oil PAO-8 and selected ionic liquid was evaluated. To perform the analysis, 100Cr6 steel samples uncoated and coated with a-C:H and a-C:H:Si were compared. Surface topography studies were performed using an atomic force microscope. Using SEM with an EDS analyser, the surface morphology of the coatings was observed, and the elements contained in the coatings were identified. Tribotests were carried out in a ball-on-disc tribotester under dry friction and with lubricants. The characteristics of the texture of the samples before and after the tribotests were determined using a confocal microscope in an interferometric mode. The test results showed that the tribo-pairs with a-C:H in lubrication with ionic liquid had the best tribological characteristics, i.e., the lowest coefficient of sliding friction.

EVALUATION OF TRIBOTECHNICAL PROPERTIES OF THE COATING OBTAINED BY ELECTRIC SPARK HARDENING

2020 ◽  
Vol 4 (141) ◽  
pp. 157-163
Author(s):  
IL’YA ROMANOV ◽  
◽  
ROMAN ZADOROZHNIY
Keyword(s):  
Wear Resistance ◽  
Reference Sample ◽  
Optical Microscope ◽  
Research Purpose ◽  
Tribotechnical Properties ◽  
Uncoated Surface ◽  
Before And After ◽  
Materials Used ◽  
Friction Track

When applying coatings using various methods on the surfaces of moving parts that work in joints, it is important to make sure that the coatings are strong and wear-resistant in order to return them to their original resource. All existing hardening technologies and materials used to perform coatings have their own characteristics, therefore, the quality of the resulting coatings can be judged only after specific tests. (Research purpose) The research purpose is in evaluating the properties of the coating obtained by the method of electric spark hardening, and its ability to resist friction and mechanical wear. (Materials and methods) Authors conducted tests on the basis of the "Nano-Center" center for collective use. A coating was applied on the BIG-4M unit with a VK-8 hard alloy electrode, tribological properties were evaluated on a CSM Instruments TRB-S-DE-0000 tribometer, the width of the friction track was measured after the test using an inverted OLYMPUS gx51 optical microscope, and samples were weighed before and after the test on a VLR-200 analytical balance. Conducted research in accordance with GOST 23.224-86 and RD 50-662-88 guidelines. (Results and discussion) The article presents performed tests on the run-in and wear resistance of the coating. The samples were worked on with a step-by-step increase in the load. During the tests, the friction force was drawed on the diagram. Authors compared the results with the reference sample, an uncoated surface. (Conclusions) The resulting coating has better run-in and wear resistance compared to the standard, and the increase in wear resistance in dry friction conditions is very significant.

scholarly journals Characterisation of Plasticity Response for Reciprocating Sliding Wear Test of Ti-6Al-4V under Variables Number of Cycles

2015 ◽  
Vol 773-774 ◽  
pp. 168-172
Author(s):  
D. Harun ◽  
D. Nalatambi ◽  
Ramdziah Md. Nasir ◽  
Abdul Latif Mohd Tobi
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloy ◽  
Sliding Wear ◽  
Wear Track ◽  
Wear Test ◽  
Optical Microscope ◽  
Variable Number ◽  
Reciprocating Sliding ◽  
Number Of Cycles ◽  
Reciprocating Sliding Wear

Reciprocating sliding wear test of uncoated titanium alloy, Ti-6Al-4V is investigated using pin-on-flat contact arrangement of Ti-6Al-4V/Ti-6Al-4V pair under variable number of cycles at low number of cycles. The worn surfaces of the titanium alloy specimens were analyzed with the use of optical microscope (2D and 3D OM) and Vickers Hardness analysis was carried on. The pattern of the wear scar characteristics determined and the finding at the end of wear track had been focus through the presence at the end of wear track. It is suggesting an evidence of plastic deformation with the increasing in hardness value. The increase in hardness value at the end of wear track indicates increase in the plastic deformation with increasing number of cycles.

scholarly journals Recent advances in characterizing the “bee” structures and asphaltene particles in asphalt binders

2020 ◽  
Vol 13 (6) ◽  
pp. 697-706
Author(s):  
Yuhong Wang ◽  
Kecheng Zhao ◽  
Fangjin Li ◽  
Qi Gao ◽  
King Wai Chiu Lai
Keyword(s):  
Near Field ◽  
Asphalt Binder ◽  
Optical Microscope ◽  
Asphalt Binders ◽  
Zero Shear Viscosity ◽  
Surface Features ◽  
Asphaltene Content ◽  
Scanning Transmission ◽  
Before And After ◽  
Binder Aging

AbstractThe microscopic surface features of asphalt binders are extensively reported in existing literature, but relatively fewer studies are performed on the morphology of asphaltene microstructures and cross-examination between the surface features and asphaltenes. This paper reports the findings of investigating six types of asphalt binders at the nanoscale, assisted with atomic force microscopy (AFM) and scanning transmission electron microscopy (STEM). The surface features of the asphalt binders were examined by using AFM before and after being repetitively peeled by a tape. Variations in infrared (IR) absorbance at the wavenumber around 1700 cm−1, which corresponds to ketones, were examined by using an infrared s-SNOM instrument (scattering-type scanning near-field optical microscope). Thin films of asphalt binders were examined by using STEM, and separate asphaltene particles were cross-examined by using both STEM and AFM. In addition, connections between the microstructures and binder’s physicochemical properties were evaluated. The use of both microscopy techniques provide comprehensive and complementary information on the microscopic nature of asphalt binders. It was found that the dynamic viscosities of asphalt binders are predominantly determined by the zero shear viscosity of the corresponding maltenes and asphaltene content. Limited samples also suggest that the unique bee structures are likely related to the growth of asphaltene content during asphalt binder aging process, but more asphalt binders from different crude sources are needed to verify this finding.

scholarly journals Effect of natural disinfectant (Moringa oleifera) and a chemical disinfectant (calcium hypochlorite) on nematode eggs: bioefficiency and impact of physico-chemical variables

2020 ◽  
Vol 10 (2) ◽  
pp. 335-346
Author(s):  
Arnold Landry Fotseu Kouam ◽  
Gideon Aghaindum Ajeagah
Keyword(s):  
Petri Dish ◽  
Nematode Species ◽  
Optical Microscope ◽  
Chemical Parameters ◽  
Calcium Hypochlorite ◽  
Physico Chemical ◽  
Before And After ◽  
Nematode Eggs ◽  
Chemical Disinfectant ◽  
Physical And Chemical

Abstract The aim of this study is to determine the effectiveness of disinfectant on the viability of eggs from three nematode species (Ascaris, Trichuris, Ankylostoma). It was conducted in a microcosm from June 2018 to June 2019. The wastewater scan was sampled using 5 L sterile containers, the sample was arranged in four replicas, three tests and one control. The test samples received three disinfectants (Moringa, calcium hypochlorite and Moringa associated with calcium hypochlorite) at varying concentrations. The physical and chemical parameters were measured before and after the application of each disinfectant. The samples were then observed under an optical microscope. The viability of the eggs was determined by incubating the Petri dish samples at 30 °C for 30 days. The analyses show that some physicochemical parameters can significantly influence the efficacy of disinfectant on the eggs. The calcium hypochlorite associated with Moringa at 0.6 g/L showed greater efficacy on reducing viability and inactivation of eggs with 100% efficacy yield rates on Ankylostoma and Trichuris trichiuria and 97% on Ascaris lumbricoides eggs; this efficacy is significantly different from that observed on samples treated with Moringa and simple calcium hypochlorite. Of the three parasites tested, A. lumbricoides showed greater resistance to the disinfectant.

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