Effects of Pure Water on the Tribological Properties of Self-Mated Titanium

2012 ◽  
Vol 591-593 ◽  
pp. 1127-1130
Author(s):  
Yuh Ping Chang ◽  
Jeng Haur Horng ◽  
Huann Ming Chou ◽  
Jin Chi Wang
Keyword(s):  
Friction Coefficient ◽  
Contact Resistance ◽  
Tribological Properties ◽  
Wear Mechanisms ◽  
Pure Water ◽  
Electrical Contact ◽  
Water Lubrication ◽  
Material Transfer ◽  
Electrical Contact Resistance ◽  
Novel Method

The novel method of using continuous variations of the electrical contact resistance and the friction coefficient for monitoring the tribological properties and the wear mechanisms of titanium pairs in air had been applied successfully by the authors. Therefore, this study further investigated the tribological properties and the wear mechanisms of self-mated titanium in pure water. In order to investigate the chemical reactions of titanium sliding against under water lubrication, the continuous variations of electrical contact resistance and friction coefficient were measured. SEM was used to observe the microstructures and of material transfer. The variations of electrical contact resistance were shown to produce clear and strong signals, superior to monitoring continuous friction coefficient variations for the self-mated titanium in pure water. According to the variations of electrical contact resistance, TiO2 was inferred to form at the interfaces of self-mated titanium in pure water. All of the experimental results demonstrated that the water lubrication has great potential for the research.

Electrical Contact Resistance Approach to Tribological Properties of Artificial Joints

2008 ◽  
Vol 594 ◽  
pp. 383-388
Author(s):  
Yuh Ping Chang ◽  
Ruei Hong Wang ◽  
Yu Yang Hung ◽  
Huann Ming Chou ◽  
Jin Chi Wang
Keyword(s):  
Friction Coefficient ◽  
Contact Resistance ◽  
Tio2 Film ◽  
Tribological Properties ◽  
Electrical Contact ◽  
Dynamic Monitoring ◽  
The Novel ◽  
Semiconductor Films ◽  
Electrical Contact Resistance ◽  
Novel Method

The tribo-electrification mechanisms had been successfully applied to dynamic monitor the tribological properties between the metal films by our laboratory members. Moreover, the novel method of using continuous tribo-electrification variations for monitoring showed more sensitive and discriminative than that by the continuous friction coefficient variations as usual. However, the above method is only suitable for the conducted material pairs. This study is based on the above views to further develop another novel method for dynamic monitoring the tribological properties between the semiconductor films in the friction process. The experiment was conducted by the self-developed friction tester and its measure system. The continuous variations of electrical contact resistance and friction coefficient were measured for monitoring the timings of film rupture between the semiconductor films. Moreover, the wear loss was measured by an accuracy balance and the SEM was used to observe the structures of material transfer. Therefore, the wear mechanisms of Ti sliding against Ti with TiO2-film under different normal loads can be investigated. According to the experimental results of this study, the novel method of using electrical contact resistance variations does show great potentialities for dynamic monitoring the tribological properties of the TiO2-film.

Discrete drops in the electrical contact resistance during nanoindentation of a bulk metallic glass

2016 ◽  
Vol 108 (18) ◽  
pp. 181903 ◽  
Author(s):  
Gaurav Singh ◽  
R. L. Narayan ◽  
A. M. Asiri ◽  
U. Ramamurty
Keyword(s):  
Metallic Glass ◽  
Contact Resistance ◽  
Bulk Metallic Glass ◽  
Electrical Contact ◽  
Electrical Contact Resistance

Tribological and electrical behavior of Cu-based composites with addition of Ti-doped NbSe2 nanoplatelets

2018 ◽  
Vol 70 (3) ◽  
pp. 560-567 ◽  
Author(s):  
Jian Feng Li ◽  
Qin Shi ◽  
HeJun Zhu ◽  
ChenYu Huang ◽  
Shuai Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Solid State ◽  
Friction Coefficient ◽  
Electrical Properties ◽  
Tribological Properties ◽  
Solid State Reaction ◽  
Electrical Contact ◽  
Solid State Reaction Method ◽  
Content Type ◽  
Reaction Method

Purpose This paper aims to clarify the size and morphology of transition metal dichalcogenides has an impact on lubrication performance of Cu-based composites. This study is intended to show that Cu-based electrical contact materials containing Nb0.91Ti0.09Se2 have better electrical and tribological properties than those containing NbSe2. The tribological properties of Cu-based with different Ti-dopped NbSe2 content were also discussed. Design/methodology/approach The NbSe2 and Nb0.91Ti0.09Se2 particles were fabricated by thermal solid state reaction method. The powder metallurgy technique was used to fabricate composites with varying Nb0.91Ti0.09Se2 mass fraction. The phase composition of Cu-based composites was identified by X-ray diffraction, and the morphology of NbSe2/Nb0.91Ti0.09Se2 and the worn surface of composites were characterized by scanning electron microscopy and transmission electron microscopy. In addition, the tribological properties of composites were appraised using a ball-on-disk multi-functional tribometer. The data of friction coefficient and resistivity were analyzed and the corresponding conclusion was drawn. Findings In comparison with the pure copper, Cu-based composites containing Nb0.91Ti0.09Se2/NbSe2 had a lower friction coefficient, illustrating the Nb0.91Ti0.09Se2 with nano-size particles prepared in this work is a perfect choice for the fabrication of excellent electrical contact composites. Compared to composites with NbSe2, composites containing Nb0.91Ti0.09Se2 have better tribological and electrical properties. Research limitations/implications Because of the use of thermal solid state reaction method, the size of NbSe2 and Nb0.91Ti0.09Se2 is relatively large. Therefore, the fabrication of finer particles of Nb0.91Ti0.09Se2 is encouraged. Originality/value In this paper, the authors discuss the tribological and electrical properties of Cu-based composites, and the value of optimum obtained as Nb0.91Ti0.09Se2 content is 15 Wt.%.

scholarly journals The Wear Process During the “Running-In” of Steel in Lubricated Sliding

1987 ◽  
Vol 109 (4) ◽  
pp. 587-591 ◽  
Author(s):  
M. Suzuki ◽  
K. C. Ludema
Keyword(s):  
Contact Resistance ◽  
Surface Film ◽  
Electrical Contact ◽  
Mineral Oil ◽  
Entrance Region ◽  
Engine Oil ◽  
Small Range ◽  
Electrical Contact Resistance ◽  
Metallic Contact ◽  
Wear Process

Steel cylinders were slid against flat steel disks, using a liquid lubricant, in order to study the progression of events associated with “running-in.” It was found that, when using mineral oil, the electrical contact resistance varied over a small range of high values indicating no metallic contact, whereas with engine oil a high resistance with an intermittent negligible contact resistance was found. A surface film forms from the additives in the engine oil which produces lower wear, slightly higher friction, a retarded running-in, and a rougher surface finish in the direction of sliding than does the mineral oil. A film which is composed only of Fe3O4 is formed when mineral oil is used. In addition, the mineral oil lubricated surfaces develop a conforming waviness across the sliding tracks. The oxide must have enhanced this surface conformity since it was not seen in the surfaces lubricated with engine oil. The role of the oxide may be further seen in experiments in which wear debris that accumulated in the entrance region of specimen contact was removed at frequent intervals. Little conforming waviness was seen in the latter case, suggesting that oxide which gathered in the entrance region abraded grooves in the steel surfaces. After the oxides were dislodged the friction increased and the contact resistance decreased for a time, indicating that the oxide acted like a solid lubricant.

Simultaneous Electrical and Thermal Modeling of a Contact-Type RF MEMS Switch

2003 ◽  
Author(s):  
Brian Jensen ◽  
Zhongde Wang ◽  
Kazuhiro Saitou ◽  
John L. Volakis ◽  
Katsuo Kurabayashi
Keyword(s):  
Contact Resistance ◽  
Direct Contact ◽  
Rf Mems ◽  
Bulk Material ◽  
Thermal Contact ◽  
Electrical Contact ◽  
Maximum Temperature ◽  
Electrical Contact Resistance ◽  
Rf Mems Switch ◽  
Mems Switch

Improving the power handling capability of direct contact RF MEMS switches requires a knowledge of conditions at the contact. This paper models the temperature rise in a direct contact RF MEMS switch, including the effects of electrical and thermal contact resistance. The maximum temperature in the beam is found to depend strongly on the power dissipation at the contact, with almost no contribution from dissipation due to currents in the rest of the switch. Moreover, the maximum temperature is found to exceed the limit for metal softening for a significant range of values of thermal and electrical contact resistance. Since local contact asperity temperature can be hundreds of degrees higher than the bulk material temperature modeled here, these results underscore the importance of understanding and controlling thermal and electrical contact resistance in the switch.

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