scholarly journals Properties of Ion Implanted Ti-6Al-4V Processed using Beamline and PSII Techniques

1996 ◽  
Vol 438 ◽  
Author(s):  
K. C. Walter ◽  
J. M. Williams ◽  
J. S. Woodring ◽  
M. Nastasi ◽  
D. B. Poker ◽  
...  
Keyword(s):  
Wear Rate ◽  
Dose Level ◽  
Surface Hardness ◽  
Plasma Source ◽  
Wear Testing ◽  
Nitrogen Gas ◽  
Plasma Source Ion Implantation ◽  
Boron Implantation ◽  
Pin On Disk ◽  
Disk Method

AbstractThe surface of Ti-6Al-4V (Ti64) alloy has been modified using beamline implantation of boron. In separate experiments, Ti64 has been implanted with nitrogen using a plasma source ion implantation (PSII) technique utilizing either ammonia (NH 3), nitrogen (N2), or their combinations as the source of nitrogen ions. Beamline experiments have shown the hardness of the N-implanted surface saturates at a dose level of ˜4× 1017 at/cm2 at ˜10 GPa. The present work makes comparisons of hardness and tribological tests of (1) B implantation using beamline techniques, and (2) N implanted samples using ammonia and/or nitrogen gas in a PSII process. The results show that PSII using N2 or NH3 gives similar hardness as N implantation using a beamline process. The presence of H in the Ti alloy surface does not affect the hardness of the implanted surface. Boron implantation increased the surface hardness by as much as 2.5x at the highest dose level. Wear testing by a pin-on-disk method indicated that nitrogen implantation reduced the wear rate by as much as 120x, and boron implantation reduced the wear rate by 6.5x. Increased wear resistance was accompanied by a decreased coefficient of friction.

Improved Tribological Behavior of Boron Implanted Ti-6A1-4V

1997 ◽  
Vol 505 ◽  
Author(s):  
N. P. Baker ◽  
K. C. Walter ◽  
M. Nastasi
Keyword(s):  
Wear Resistance ◽  
Depth Profile ◽  
Surface Hardness ◽  
Plasma Source ◽  
Wear Coefficient ◽  
Ion Energy ◽  
Depth Profiles ◽  
Transmission Electron ◽  
Plasma Source Ion Implantation ◽  
Boron Implantation

ABSTRACTPrevious research has compared the mechanical properties of Ti6A14V implanted with nitrogen using the plasma source ion immersion process and Ti6A14V implanted with boron using the beamline process [1]. Although the nitrogen implanted Ti6A14V had superior wear resistance it was concluded that the wear resistance of boron implanted Ti6AI4V might be improved to comparable levels if boron were implanted at lower energies to increase the concentration of boron at the surface. Boron implantation of Ti6A14V has been conducted at combinations of 32 and 40 keV to supplement that done previously at 75 keV. Shallower boron depth profiles with higher B-concentrations in the Ti64 surface have been obtained by tailoring the combinations of ion energy and dose. This work used three different ion energy and dose combinations of 4×1017 B-at/cm2 at 40 keV plus 2×1017 B-at/ cm2 at 32 keV, 4×1017 B-at/cm2 at 40 keV, and 4×1017 B-at/cm2 at 32 keV plus 2×1017 B-at/ cm2 at 40 keV. Comparisons are made between Ti6A14V with a shallow implanted boron depth profile, Ti6AI4V with a deeper boron depth profile and nitrogen implanted using a plasma source ion implantation process. It has been previously shown that while boron implanted Ti64 has a ~30% higher surface hardness than nitrogen implanted Ti64, the N-implantation reduced the wear coefficient of Ti64 by 25–120x, while B-implantation reduced the wear coefficient by 6.5x or less. The results show that no significant improvement is made in the wear resistance of boron implanted Ti6A14V by increasing the concentration of boron at the surface from approximately 10%to 43%. Transmission electron microscopy (TEM) and selected area diffraction (SAD) indicated the formation of crystalline TiB in the implanted surface layer. Shallower depth profiles result in reductions of the Ti6AI4V wear coefficient by 6.5x or less which is the same result obtained earlier with the deeper boron depth profile. Surface hardness of Ti6A14V with shallower boron depth profiles was improved approximately 10%compared to the results previously acquired with deeper boron depth profiles.

Investigation of the Wear Behavior of AA6082 Against Different Counterparts

2021 ◽  
Author(s):  
Safiye İpek Ayvaz ◽  
Mehmet Ayvaz
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Behavior ◽  
Specific Wear Rate ◽  
Pin On Disk ◽  
Disk Method ◽  
Sliding Distance ◽  
Oxidation Wear

In this study, the effect of different counterparts on the wear resistance of AA6082 aluminum alloy was investigated. In tests using pin-on-disk method, 6 mm diameter Al2O3, 100Cr6 and WC-6Co balls were used as counterparts. The tests were carried out using 500 m sliding distance and 5N load. The lowest specific wear rate was measured as 7.58x10-4 mm3/Nm in WC-6Co / AA6082 couple, and the highest value was measured as 9.71x10-4 mm3/Nm in 100Cr6/AA6082 couple. In the Al2O3/AA6082 couple, the specific wear rate of the AA6082-T6 sample was determined as 8.23x10-4 mm3/Nm.While it was observed that the dominant wear type in the 100Cr6/AA6082 pair was abrasive wear, oxidation wear and oxide tribofilm were detected in the WC-6Co/AA6082 and Al2O3/AA6082 couple besides the abrasive wear.

scholarly journals Tribological Behavior of 42CrMo4 Steel Nitrided by Plasma

2015 ◽  
Vol 21 (3) ◽  
pp. 220 ◽  
Author(s):  
Okba Belahssen ◽  
Abdelouahed Chala ◽  
Okba Belahssen ◽  
Said Benramache
Keyword(s):  
Wear Rate ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
Compound Layer ◽  
42Crmo4 Steel ◽  
Layer Increase ◽  
Pin On Disk ◽  
Microhardness Tester

<p>This paper presents wear behavior of the plasma nitride 42CrMo4 steel. This steel is used in mechanical industry; it has been assessed by evaluating tribological properties and surface hardness by using a pin-on-disk wear machine and microhardness tester. Experimental results showed that the nitrides ε-Fe<sub>2-3</sub>N and γ’-Fe<sub>4</sub>N present in the compound layer increase the microhardness. It is found that plasma nitriding improves the wear rate and the presence of a hard and brittle compound layer on the surface causes an increase in wear of the specimen surface.</p>

The Effect of Motion Path on the Wear Rate of UHMWPE for Orthopaedic Implants

1999 ◽  
Author(s):  
Jeff A. Sprague ◽  
Willard L. Sauer
Keyword(s):  
Wear Rate ◽  
Wear Test ◽  
Axial Rotation ◽  
Wear Testing ◽  
Motion Path ◽  
Orthopaedic Implant ◽  
Wear Rates ◽  
Nonlinear Motion ◽  
Pin On Disk

Abstract The effect of adding a second axis of motion was investigated for pin-on-disk wear testing of ultra-high-molecular-weight polyethylene (UHMWPE) for orthopaedic implant applications. In addition to linear reciprocation of the UHMWPE or metal disk, axial rotation of the metal or UHMWPE pin was conducted. The added rotation reproduces the cross-shear on the UHMWPE surface that is generated in clinically relevant wear simulator tests and in vivo. The wear rates that result from the multi-axis pin-on-disk tests are significantly higher (one to two orders of magnitude) than those seen in the linear-only tests. This supports the findings of other researchers (Bragdon et al., 1996; McKellop, 1995; Walker et al., 1996; Wang et al. 1997) in that the application of nonlinear motion increases the wear of UHMWPE substantially. This is further validated by the comparison of a hip simulator wear test conducted with three axes of motion — rotation, flexion, and abduction — to a test conducted with two axes of motion — rotation and flexion. The absence of the abduction eliminated a significant degree of nonlinear motion (cross-shear) and, consequently, the wear rate was significantly lower than that seen in the test with abduction.

Preparation and Characterization Teeth Filling of PMMA/ n-TiO 2 To Wear Resistance and antibacterial

2019 ◽  
Vol 10 (03) ◽  
Author(s):  
Fadhil K. Farhan ◽  
Mohammed O. Kadhim ◽  
Mohammed H. Ali ◽  
Awatif S. Abass
Keyword(s):  
Titanium Oxide ◽  
Surface Hardness ◽  
Biologically Active ◽  
Dry Sliding Wear ◽  
X Ray Diffraction ◽  
Ultrasound Technique ◽  
Microscopy Technique ◽  
Mixing Method ◽  
Pin On Disk ◽  
Disk Method

In this research, the light filling with titanium oxide was formed as an anti-corrosion and antibacterial antibiotic. White acrylic powder was used with its solvent after mixing it with different percentages of biologically active titanium oxide using the liquid mixing method and the ultrasound technique to obtain a homogeneous mixture free of aggregates and then was molded into special molds for the required examination. The hard surface hardness of the samples prepared using the hardness device was examined along with the test of dry sliding wear using a Pin-on-disk method, as well as the examination of the samples to resist the bacteria of tooth decay. Structural tests were performed on X-ray diffraction techniques, scanning electron microscopy technique and infrared technique. The results were interpreted based on the practical density of the prepared samples.

scholarly journals Wear of MgO-CaO-SiO2-P2O5-F-Based Glass Ceramics Compared to Selected Dental Ceramics

2007 ◽  
Vol 2007 ◽  
pp. 1-5 ◽  
Author(s):  
Jongee Park ◽  
Gürel Pekkan ◽  
Abdullah Ozturk
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Wear Testing ◽  
Dental Ceramics ◽  
Controlled Crystallization ◽  
Pin On Disk ◽  
Dental Applications ◽  
Wear Tests

Wear of a glass-ceramic produced through controlled crystallization of a glass in the MgO-CaO-SiO2-P2O5-F system has been evaluated and compared to various commercial dental ceramics including IPS Empress 2, Cergo Pressable Ceramic, Cerco Ceram, and Super porcelain EX-3. Wear tests were performed in accord with the ASTM G99 for wear testing with a pin-on-disk apparatus. The friction coefficient and specific wear rate of the materials investigated were determined at a load of 10 N and at ambient laboratory conditions. Microhardness of the materials was also measured to elucidate the appropriateness of these materials for dental applications.

Al-4.5 Cu-3.8 Fe In Situ Composites: Effect of Rolling on Microstructure and Wear Properties

2011 ◽  
Vol 264-265 ◽  
pp. 1939-1943 ◽  
Author(s):  
S.K. Shaha ◽  
A.S.W. Kurny ◽  
Mahbub Hasan ◽  
S. Dyuti
Keyword(s):  
Wear Rate ◽  
Solidification Process ◽  
Hardness Measurement ◽  
Optical Microscope ◽  
Wear Testing ◽  
Wear Properties ◽  
In Situ Composites ◽  
Pin On Disk ◽  
Hot Rolled

Al based MMCs have attracted a lot of attention particularly for their desirable combination of high stiffness and low specific gravity. In the present study, Al-4.5Cu-3.8Fe in-situ composites were manufactured by using solidification process. During solidification Al-Fe intermetallic was formed in a matrix of Al-Cu alloy. The composite was hot rolled at different degree using a two high rolling mill. Subsequently the composites were characterized by SEM, XRD, hardness measurement and wear testing. Wear testing was conducted on a pin-on-disk machine by applying 10 KN load. After the wear tests, the worn surfaces of the composite specimens were examined under an optical microscope. According to experimental results, as cast in-situ composites exhibited the highest wear rate. The hardness increased and wear rate decreased with the extent of rolling. The presence of reinforcing Al3Fe phase and fragmentation of those particles during hot rolling are suggested to contribute to the better wear resistance of the composites. The extent of abrasive wear was largest in the case of as cast composites, as evidenced by deep grooves on the worn surface and highest weight loss.

scholarly journals First Results from the Los Alamos Plasma Source Ion Implantation Experiment

1993 ◽  
Vol 316 ◽  
Author(s):  
D. J. Rej ◽  
J. R. Conrad ◽  
R. J. Faehl ◽  
R. J. Gribble ◽  
I. Henins ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Large Scale ◽  
Surface Hardness ◽  
Plasma Source ◽  
Plasma Electron ◽  
Los Alamos ◽  
Particle In Cell ◽  
Surface Areas ◽  
Plasma Source Ion Implantation ◽  
First Results

ABSTRACTA new facility is operational at Los Alamos to examine plasma source ion implantation on a large scale. Large workpieces can be treated in a 1.5-m-diameter, 4.6-m-Jong plasma vacuum chamber. Primary emphasis is directed towards improving tribological properties of metal surfaces. First experiments have been performed at 40 kV with nitrogen plasmas. Both coupons and manufactured components, with surface areas up to 4 m2, have been processed. Composition and surface hardness of implanted materials are evaluated. Implant conformality and dose uniformity into practical geometries are estimated with multidimensional particle-in-cell computations of plasma electron and ion dynamics, and Monte Carlo simulations of ion transport in solids.

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