Very low wear rate measured in a hip endoprosthesis removed after 38 years

Hard multilayer coatings are technologically promising materials for reducing wear of tribological parts. Multilayer coatings with a systematic alternation of the pair [(TiCx/Ti/C)÷(a-C)] were deposited on stainless and tool steel by the PVD technique. Hardness (H), elasticity modulus (E) and critical cracking load (Pcr) were determined by the nanoindentation method. Nanofrictional wear test was conducted under multipass sliding of a diamond indenter (Ø 50 nm) under constant load. The specific coefficient of nanofrictional wear of [(TiCx/Ti/C)÷(a-C)]nwith different composition of titanium-containing layers was determined. The nanofrictional wear rate of [(TiCx/Ti/C)÷a-C]ndepends on the elastic and plastic characteristics of multilayer coating as a whole. Coatings having H3/E2> 0.12 and Pcr> 58 mN demonstrate low wear rate.

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A Tribological Study of Mo/Al2O3 in Sliding Contact

MRS Proceedings ◽

10.1557/proc-140-301 ◽

1988 ◽

Vol 140 ◽

Cited By ~ 2

Author(s):

Hyun-Soo Hong ◽

Ward O. Winer

Keyword(s):

Wear Rate ◽

Molybdenum Oxide ◽

Sliding Contact ◽

Tribological Study ◽

Real Area Of Contact ◽

Low Wear ◽

Real Area ◽

Lubricating Properties

AbstractThis is Part II of a tribological study of metal/ceramic pair in a sliding contact. The tribological behavior of molybdenum against a single crystal A12O3 was investigated at bulk temperatures of 23ºC and 400ºC using a sliding speed of 4 m/s and loads from nine to twenty five Newtons. The role of oxidational wear was confirmed at both temperatures. The linear dependency of wear rate on load was identified at 23ºC tests. At 400ºC, there was a rapid increase of wear rate at a load of about 25 N possibly due to the volatilization of MoO3, which is the limitation of molybdenum oxide as a solid lubricant. However, this study showed that the out-of-contact oxide formation may have prevented the catastrophic oxidation during contact at the real area of contact. It also showed that in-situ formed molybdenum oxide has good lubricating properties (≃ 0.3) and a low wear rate (≃ 10-14 m3/m). Therefore, this molybdenum can be used for a large range of sliding speeds and loads.

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Deep Cryogenic Treatment and CrN Coating Effects on Micro-Scale Abrasion of Aluminum Alloy AA 6101-T4

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.936.1047 ◽

2014 ◽

Vol 936 ◽

pp. 1047-1055 ◽

Cited By ~ 1

Author(s):

Edgar S. Ashiuchi ◽

Volker F. Steier ◽

Cosme R.M. Silva ◽

Tales D. Barbosa ◽

Tiago F.O. Melo ◽

...

Keyword(s):

Wear Resistance ◽

Aluminum Alloy ◽

Aluminum Alloys ◽

Wear Rate ◽

Cryogenic Treatment ◽

Deep Cryogenic Treatment ◽

Low Wear ◽

The Impact ◽

Improve Wear Resistance ◽

Wear Tests

The endurance of components made of aluminum and aluminum alloys is often limited by their low yield strength and by their low wear resistance. The aim of this paper is to investigate the effect of different methods that can improve wear resistance of aluminum alloys. As a first approach, a highly wear resistant chromium nitrite layer was deposited by plasma vapor deposition on the surface of the aluminum alloy AA 6101-T4. In the second method, an ultra-deep cryogenic treatment was selected. Both methods have been previously used to improve the wear resistance of other harder substrate materials, like tool steel. To investigate the impact of the two methods on the wear resistance of such alloy, micro abrasive wear tests were carried out and an analysis based on the Archard’s law was considered. The results showed a decrease of the wear rate by 29% and 26% for the coated and for the cryogenically treated specimens, respectively, when compared to the as received material. The work also investigated the performance of three different methods (Allsopp, Double Intercept and Polynomial AT) usually considered to calculate the wear rate of coated samples. The three methods presented similar measures of wear rate for the substrate and for the coating

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Selection of Suitable Material for Journal Bearing by Tribology

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.f9483.038620 ◽

2020 ◽

Vol 8 (6) ◽

pp. 4392-4399

Keyword(s):

Wear Rate ◽

Coefficient Of Friction ◽

Journal Bearing ◽

Sem Analysis ◽

Journal Bearings ◽

Inconel 625 ◽

Molybdenum Disulphide ◽

Suitable Material ◽

Low Wear ◽

Selection Of

Wear is an influencing parameter which reduces the overall life of a machine and its parts. The wear rate and coefficient of friction under the same conditions of speed, load, lubrication and time were calculated for a set of materials used as journal bearings. Since journal bearings are important in a variety of applications, a wise selection of material with a constant low wear rate and low coefficient of friction is essential. The four materials tested for this purpose include Molybdenum Disulphide (MoS2 ), Stainless Steel (SS 304), Nylon 66, INCONEL 625. The basic methodology for determining wear and friction of these materials involves the use of a pin-on-disc test apparatus. The materials taken for testing are made into a pin of diameter and length 8 mm and 25 mm respectively. Scanning Electron Microscope (SEM) analysis and surface roughness measurements were carried out to study the properties. Hence, INCONEL 625 was found to be the ideal material for journal bearing applications due to its low wear rate, no fluctuation in wear rate, lower coefficient of friction and better mechanical properties compared to others.

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Alumina-Toughened-Zirconia with Low Wear Rate in Ball-on-Flat Tribological Tests at Temperatures to 500 °C

Materials ◽

10.3390/ma14247646 ◽

2021 ◽

Vol 14 (24) ◽

pp. 7646

Author(s):

Marek Grabowy ◽

Kamil Wojteczko ◽

Agnieszka Wojteczko ◽

Grzegorz Wiązania ◽

Maciej Łuszcz ◽

...

Keyword(s):

Wear Rate ◽

Tetragonal Zirconia ◽

Commercial Alumina ◽

Strongly Connected ◽

The Common ◽

Low Wear ◽

Zirconia Powders ◽

Better Than ◽

Sem Analyses ◽

Ball On Disc

An alumina-toughened zirconia (ATZ) material, fabricated using a procedure consisting of the common sintering of two different zirconia powders, was tested using the ball-on-disc method in a temperature range between room temperature and 500 °C. Corundum balls were used as a counterpart. The ATZ composite behaviour during tests was compared with that of commonly used α-alumina and tetragonal zirconia sintered samples. At temperatures over 350 °C, a drastic decrease in the wear rate of the material was detected. SEM analyses proved that, in such conditions, nearly the whole surface of the sliding material was covered with a layer of deformed submicrometric grains, which limited contact with the part of material that was not deformed. The mentioned layer was relatively strongly connected with the material, increased its resistance, and decreased its coefficient of friction. As a reference, commonly used materials, namely commercial alumina and tetragonal zirconia, were tested. The wear parameters of the composite were significantly better than those registered for the materials prepared of commercial powders.

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Exploring wear at the nanoscale with circular mode atomic force microscopy

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.8.266 ◽

2017 ◽

Vol 8 ◽

pp. 2662-2668 ◽

Cited By ~ 5

Author(s):

Olivier Noel ◽

Aleksandar Vencl ◽

Pierre-Emmanuel Mazeran

Keyword(s):

Atomic Force Microscopy ◽

Wear Rate ◽

Industrial Applications ◽

Experimental Methodology ◽

Wear Volume ◽

Asperity Contact ◽

Force Microscopy ◽

Quantitative Measurements ◽

Atomic Force ◽

Low Wear

The development of atomic force microscopy (AFM) has allowed wear mechanisms to be investigated at the nanometer scale by means of a single asperity contact generated by an AFM tip and an interacting surface. However, the low wear rate at the nanoscale and the thermal drift require fastidious quantitative measurements of the wear volume for determining wear laws. In this paper, we describe a new, effective, experimental methodology based on circular mode AFM, which generates high frequency, circular displacements of the contact. Under such conditions, the wear rate is significant and the drift of the piezoelectric actuator is limited. As a result, well-defined wear tracks are generated and an accurate computation of the wear volume is possible. Finally, we describe the advantages of this method and we report a relevant application example addressing a Cu/Al2O3 nanocomposite material used in industrial applications.

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Tribological assessment of a flexible carbon-fibre-reinforced poly(ether—ether—ketone) acetabular cup articulating against an alumina femoral head

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1243/09544119jeim334 ◽

2008 ◽

Vol 222 (3) ◽

pp. 273-283 ◽

Cited By ~ 49

Author(s):

S C Scholes ◽

I A Inman ◽

A Unsworth ◽

E Jones

Keyword(s):

Wear Rate ◽

Carbon Fibre ◽

Acetabular Component ◽

Volumetric Wear ◽

Wear Rates ◽

Lubrication Regime ◽

Ether Ether Ketone ◽

Poly Ether Ether Ketone ◽

Ether Ketone ◽

Low Wear

New material combinations have been introduced as the bearing surfaces of hip prostheses in an attempt to prolong their life by overcoming the problems of failure due to wear-particle-induced osteolysis. This will hopefully reduce the need for revision surgery. The study detailed here used a hip simulator to assess the volumetric wear rates of large-diameter carbon-fibre-reinforced pitch-based poly(ether—ether—ketone) (CFR-PEEK) acetabular cups articulating against alumina femoral heads. The joints were tested for 25×106 cycles. Friction tests were also performed on these joints to determine the lubrication regime under which they operate. The average volumetric wear rate of the CFR-PEEK acetabular component of 54 mm diameter was 1.16 mm3/106 cycles, compared with 38.6 mm3/106 cycles for an ultra-high-molecular-weight polyethylene acetabular component of 28 mm diameter worn against a ceramic head. This extremely low wear rate was sustained over 25×106 cycles (the equivalent of up to approximately 25 years in vivo). The frictional studies showed that the joints worked under the mixed—boundary lubrication regime. The low wear produced by these joints showed that this novel joint couple offers low wear rates and therefore may be an alternative material choice for the reduction of osteolysis.

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In Vivo Tribological Performance of 231 Metal-On-Metal Hip Articulations

Hip International ◽

10.1177/112070000201200202 ◽

2002 ◽

Vol 12 (2) ◽

pp. 73-76 ◽

Cited By ~ 49

Author(s):

C. Rieker ◽

P. Köttig

Keyword(s):

Stainless Steel ◽

Wear Rate ◽

Tribological Performance ◽

Wear Behaviour ◽

Cobalt Chromium ◽

Metal On Metal ◽

Low Wear ◽

One Year

231 cobalt-chromium metal-on-metal (METASUL design) retrieved articulations (297 retrieved components) were examined for their in vivo wear behaviour. A running-in period of about one year is observed where the in vivo wear rate for the whole articulation is approximately 35 μm/year. After this running-in period, the measured in vivo wear rate of the whole articulation decreases to about 5 μm/year. The metal-on-metal articulation can be considered as a very low wear articulation system. The combination of the specially designed components is mandatory to assure this low wear behaviour. In case of a mismatched bearing (stainless steel head - cobalt-chromium inlay), large amount of wear was measured.

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Characterization and Properties of CrTiN Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.625.301 ◽

2012 ◽

Vol 625 ◽

pp. 301-303 ◽

Cited By ~ 1

Author(s):

Tao Liu ◽

Xin Hui Zhang ◽

Xiao Mei Yuan ◽

Xiao Hui Zheng ◽

Guang An Zhang

Keyword(s):

Wear Rate ◽

Magnetron Sputtering ◽

Diffraction Analysis ◽

Preferential Orientation ◽

X Ray Diffraction ◽

Low Friction ◽

Medium Frequency ◽

X Ray ◽

Low Wear ◽

Ti Content

A series of CrTiN films were successfully deposited by medium frequency magnetron sputtering in a mixture gas of nitrogen and argon. X-ray diffraction analysis shows that the CrTiN have preferential orientation of (200). The films show low friction and low wear rate at a certain percentage of the Ti content.

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