Influence of Surface Roughness on Corrosion and Tribological Behavior of CP-Ti After Thermal Oxidation Treatment

The thermal oxidation treatment is an innovative and simple method for modifiying the surface properties of titanium such as enhance corrosion and wear resistance. The effects of isothermal oxidation immersion time on the surface properties and corrosion behavior under bovine serum of cp-Ti were studied in this paper. The treatment was done at 700oC for 0 to 36 hours in furnace chamber. The surface microhardness, surface roughness, wettability and polarization potentiodynamic corrosion of cp-Ti were determined. The result shows the surface microhardness, surface roughness, wettability and corrosion resistance of the cp-Ti enhanced by isothermal oxidation treatment. The presence of the oxide layer on the surface in the form of TiO2 rutile and Ti3O are responsible to enhance the surface properties and corrosion behavior

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Torsional Fretting Wear Properties of Thermal Oxidation-Treated Ti3SiC2 Coatings

Coatings ◽

10.3390/coatings8090324 ◽

2018 ◽

Vol 8 (9) ◽

pp. 324 ◽

Cited By ~ 2

Author(s):

Jian Wang ◽

Xiaohui Luo ◽

Yanhua Sun

Keyword(s):

Thermal Oxidation ◽

Tribological Behavior ◽

Oxidation Time ◽

Fretting Wear ◽

Average Content ◽

Crack Healing ◽

Wear Properties ◽

Oxidation Treatment ◽

Torsional Fretting ◽

Increasing Temperature

In this study, efforts were made to oxidize the Ti3SiC2 coating surface to improve its wear resistance by producing oxide layers and healing microcracks that initiated from the thermal sprayed process. Tribological behaviors of the thermal oxidation-treated Ti3SiC2 coatings subjected to various temperatures (200, 300, and 400 °C) and durations (1, 3, and 5 h) were investigated comparatively by fretting wear. The results showed that the thickness of the oxide layer and the average content of element O on the surface were gradually increased with increasing temperature. Lower friction coefficients were observed in coatings at 200–400 °C for 1 h. Better performance of crack-healing features was demonstrated at 400 °C, whereas fresh microcracks were formed under the fretting condition due to the fragility of oxides at the same time. The tribological behavior of thermal oxidation-treated Ti3SiC2 coatings was mainly controlled by delamination and abrasive wear. The volume losses induced by wear scars decreased with the increase in oxidation time under the oxidation treatment at 200 °C and increased with increasing oxidation time under the oxidation temperatures of 300 and 400 °C.

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The Influence of Laser Irradiation Parameters on Tribological Behaviour of Commercially Pure Titanium for Dental Prostheses

Volume 14: Emerging Technologies; Materials: Genetics to Structures; Safety Engineering and Risk Analysis ◽

10.1115/imece2016-66524 ◽

2016 ◽

Author(s):

Karibeeran Shanmuga Sundaram ◽

Gurusami Kiliyappan ◽

Senthil Kumaran Selvadurai

Keyword(s):

Surface Roughness ◽

Wear Resistance ◽

Pure Titanium ◽

Laser Surface ◽

Commercially Pure Titanium ◽

Laser Shock ◽

Micro Hardness ◽

Dental Prostheses ◽

Commercially Pure ◽

Cp Ti

Laser shock peening (LSP) is one of the innovative technique that produces a compressive residual stress on the surface of metallic materials, thereby significantly increasing its fatigue life in applications where failure is caused by surface-initiated cracks. The specimens were treated with laser shock waves with different processing parameters, and characterization studies were made on treated specimens. The purpose of the present study was to investigate the influence of Nd:YAG laser on commercially pure titanium (CP-Ti) used in prosthetic dental restorations. The treatment influenced change in microstructure, micro hardness, surface roughness, and wear resistance characteristics. Though CP-Ti is considered as an excellent material for dental applications due to its outstanding biocompatibility, it is not suitable when high mastication forces are applied. In the present study, pulsed Nd:YAG laser surface treatment technique was adopted to improve the wear resistance of CP-Ti. The wear test pin specimens of CP-Ti were investment cast with centrifugal titanium casting machine. The wear properties of specimens were evaluated after LSP on a “pin-on-disc” wear testing tribometer, as per ASTM G99-05 standards. The results of the wear experiment showed that the treated laser surface has higher wear resistance, micro hardness, and surface roughness compared to as-cast samples. The improvement of wear resistance may be attributed due to grain refinement imparted by LSP processes. The microstructure, wear surfaces, wear debris, and morphology of the specimen were analyzed by using optical electron microscope, scanning electron microscope, and X-ray diffraction (XRD). The data were compared using ANOVA and post-hoc Tukey tests. The characteristic change resulted in increase in wear resistance and decrease in wear rate. Hence, it is evident that the more reliable and removable partial denture metal frameworks for dental prostheses may find its applications.

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INFLUENCE OF ROUGHNESS ON THE TRIBOLOGICAL BEHAVIOR OF A STEEL-STEEL COUPLE LUBRICATED WITH THREAD COMPOUND

Latin American Applied Research - An international journal ◽

10.52292/j.laar.2019.360 ◽

2019 ◽

Vol 49 (3) ◽

pp. 193-200

Author(s):

N. A. ZABALA ◽

P. CASTRO ◽

Walter TUCKART

Keyword(s):

Surface Roughness ◽

High Pressure ◽

Tribological Behavior ◽

Normal Load ◽

Roughness Parameter ◽

Small Scale ◽

Contact Conditions ◽

Threaded Joints ◽

Copper Zinc ◽

Wear Damage

The purpose of this study is to determinate the influence of surface roughness on the tribological behavior of a lubricated steel against steel tribosystem. Tests were carried out at high pressure and slow sliding speed, in order to simulate at small scale, the contact conditions found in the seal of the threaded joints used in oil & gas casing and tubing strings. Tests were carried out with a simplified block-onring test, varying the surface roughness of rings between 1.3 to 3 m Ra values. A thread compound lubricant containing lead, copper, zinc and graphite was used. During each cycle of test, the normal load was varied linearly between 250 N and 7000 N. An exponential correlation between Ra and Rt roughness values with the wear damage was found and the wear damage of the blocks decreases about 40 percent with the increasing of initial Ra roughness parameter in the movil surface.

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Lifetime Enhancement of 4H-SiC PiN Diodes Using High Temperature Oxidation Treatment

Materials Science Forum ◽

10.4028/www.scientific.net/msf.924.440 ◽

2018 ◽

Vol 924 ◽

pp. 440-443

Author(s):

Yeganeh Bonyadi ◽

Peter M. Gammon ◽

Olayiwola Alatise ◽

Roozbeh Bonyadi ◽

Philip A. Mawby

Keyword(s):

High Temperature ◽

Thermal Oxidation ◽

Carrier Lifetime ◽

Drift Region ◽

Electrical Characteristics ◽

Pin Diodes ◽

Oxidation Treatment ◽

Temperature Oxidation ◽

Bipolar Devices ◽

Minority Carriers

In this paper, the application of a high temperature thermal oxidation and annealing process to 4H-SiC PiN diodes with 35 μm thick drift regions is explored, the aim of which was to increase the carrier lifetime in the 4H-SiC. Diodes were fabricated using 4H-SiC material and underwent a thermal oxidation in dry pure O2 at 1550◦C followed by an argon anneal at the same temperature. Reverse recovery tests indicated a carrier lifetime increase of around 42% which is due to increase of excessive minority carriers in the drift region. The switching results illustrate that the use of this process is a highly effective and efficient way of enhancing the electrical characteristics of high voltage 4H-SiC bipolar devices.

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Influence of Third Element of TiNi Alloy on Tribological Behavior in Dry and Wet Conditions for Orthodontic Applications

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.803.167 ◽

2019 ◽

Vol 803 ◽

pp. 167-171

Author(s):

Aphinan Phukaoluan ◽

Anak Khantachawana ◽

Pongpan Kaewtatip ◽

Surachai Dechkunakorn

Keyword(s):

Surface Roughness ◽

Surface Area ◽

Coefficient Of Friction ◽

Sliding Friction ◽

Tribological Behavior ◽

Artificial Saliva ◽

Tini Alloy ◽

Oral Temperature ◽

Wet Condition ◽

Dry And Wet Conditions

The tribological behavior of Ti49.4Ni50.6, Ti49Ni46Cu5 and Ti50Ni47Co3 (at%) alloy in dry and wet conditions was studied. The alloy was prepared in a Vacuum Arc Re-melting (VAR), homogenized at 800°C for 3600 s and quenched in water. The phase transformation temperatures were measured by differential scanning calorimetry. Before a tribology test, it is necessary to determine surface roughness, because high surface roughness affects friction. The hardness behavior, based on the load over residual indent area, was determined by a Vickers hardness tester. The sliding friction tests were performed using a ball-on-disk tribometer in dry condition at room temperature and wet condition in artificial saliva (pH 5.35) at 37°C (Oral temperature). The results showed that transformation temperature (Af) lowered oral temperature (37°C), this was mainly attributed to the superelastic properties that can be taken into orthodontic applications. The studies showed significant influences in dry condition of coefficient of friction. Caused by the force between the ball and the disk, contact pressure of surface area effect in wear occurred. The debris could not be removed from the surface area tested. TiNiCu and TiNiCo generated significantly lower average coefficient of friction when tested under dry condition, which may have been due to the addition of Cu and Co. Wet condition decreased coefficient of friction more than dry condition, owing to the lubricating effects of artificial saliva.

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