Sn-Cu intermetallic compound laminated film with excellent friction coefficient, contact resistance, and solder wettability

2021 ◽  
pp. 1-6
Author(s):  
Hiroki Hayashi ◽  
Naohiro Takaine ◽  
Hiroyuki Funasaki ◽  
Mitsuhiro Watanabe
Keyword(s):  
Friction Coefficient ◽  
Intermetallic Compound ◽  
Contact Resistance

Frictional and Electrical Properties of Multiwalled Carbon Nanotubes

2005 ◽  
Author(s):  
P. L. Dickrell ◽  
N. R. Raravikar ◽  
S. K. Pal ◽  
L. S. Schadler ◽  
P. M. Ajayan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Electrical Properties ◽  
Contact Resistance ◽  
Coefficient Of Friction ◽  
Static Load ◽  
Tribological Behavior ◽  
Porous Alumina ◽  
Multiwalled Carbon ◽  
Vertically Aligned

This presentation examines the tribological properties and contact resistance of oriented capped carbon multiwalled nanotube (MWNT) films. Highly anisotropic tribological behavior of MWNT films oriented in mutually orthogonal directions is observed. The average values of coefficient of friction varied from high values (μ = 0.795) for vertically aligned nanotubes grown on rigid substrates to low values (μ = 0.090) for the same nanotubes dispersed flat on the same substrates. The results were insensitive to humidity, which is in contrast to graphite materials. The multiwalled nanotube layers also had a monotonic decrease in friction coefficient with increased surface temperature in both orientations, having a 32% drop in friction coefficient over a 73°C temperature rise. Preliminary results from contact resistance measurements of nanotube films grown through a porous alumina are investigated as a function of applied static load.

Static Friction and Initiation of Slip at Magnetic Head-Disk Interfaces

1999 ◽  
Vol 122 (1) ◽  
pp. 246-256 ◽  
Author(s):  
S. Wang ◽  
K. Komvopoulos
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Film Thickness ◽  
Contact Resistance ◽  
Friction Force ◽  
Static Friction ◽  
Electric Contact ◽  
Magnetic Head ◽  
Friction Coefficients ◽  
Lubricant Films

The apparent friction force and electric contact resistance at the magnetic head-disk interface were measured simultaneously for textured and untextured disks lubricated with perfluoropolyether films of different thicknesses. The initial stick time, representing the time between the application of a driving torque and the initiation of interfacial slip, was determined based on the initial rise of the apparent friction force and the abrupt increase of the electric contact resistance. Relatively thin lubricant films yielded very short initial stick times and low static friction coefficients. However, for a film thickness comparable to the equivalent surface roughness, relatively long initial stick times and high static friction coefficients were observed. The peak value of the apparent friction coefficient was low for thin lubricant films and increased gradually with the film thickness. The variations of the initial stick time, static friction coefficient, and peak friction coefficient with the lubricant film thickness and surface roughness are interpreted in the context of a new physical model of the lubricated interface. The model accounts for the lubricant coverage, effective shear area, saturation of interfacial cavities, limited meniscus effects, and the increase of the critical shear stress of thin liquid films due to the solid-like behavior exhibited at a state of increased molecular ordering. [S0742-4787(00)03101-5]

NIIN As an Ohmic Contact to P-GAN

1998 ◽  
Vol 537 ◽  
Author(s):  
D. B. Ingerly ◽  
Y. A. Chang ◽  
Y. Chen
Keyword(s):  
Solid State ◽  
Intermetallic Compound ◽  
Contact Resistance ◽  
Ohmic Contact ◽  
Schottky Barrier Height ◽  
Rf Sputtering ◽  
Specific Contact Resistance ◽  
Transmission Line Model ◽  
Specific Contact ◽  
Compound Target

AbstractBased on the criteria for the solid state exchange reaction with p-GaN, we have investigated the intermetallic compound Niln as a possible ohmic contact. The contacts were fabricated by depositing Niln on p-GaN films (p ∼ 2 × 1017 cm-3) using RF sputtering from a compound target. The as-deposited, Niun contacts were found to be rectifying and using I-V characterization a Schottky barrier height of 0.82 eV was measured. Rapid thermal annealing of the contacts was shown to significantly decrease their resistance, with contacts annealed at 800°C for I min yielding the lowest resistance. When annealed at 800°C for 1 min Niln contacts exhibited a specific contact resistance of 8-9 × 10-3 Ωcm2, as measured by the circular transmission line model. To allow a more universal comparison the more traditional Ni/Au contacts, processed under the same conditions, were used as a standard. Their measured specific contact resistance (ρc = 1.2 - 2.1 x 10-2 Ωcm2) was significantly higher than that of the Niln contacts. Demonstrating that Niln has promise as an ohmic contact to p-GaN and should be studied in greater detail.

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.

scholarly journals NiIn as an Ohmic Contact to P-GaN

1999 ◽  
Vol 4 (S1) ◽  
pp. 745-750 ◽  
Author(s):  
D. B. Ingerly ◽  
Y. A. Chang ◽  
Y. Chen
Keyword(s):  
Solid State ◽  
Intermetallic Compound ◽  
Contact Resistance ◽  
Ohmic Contact ◽  
Schottky Barrier Height ◽  
Rf Sputtering ◽  
Specific Contact Resistance ◽  
Transmission Line Model ◽  
Specific Contact ◽  
Compound Target

Based on the criteria for the solid state exchange reaction with p-GaN, we have investigated the intermetallic compound NiIn as a possible ohmic contact. The contacts were fabricated by depositing NiIn on p-GaN films (p ∼ 2 × 1017 cm−3) using RF sputtering from a compound target. The as-deposited, NiIn contacts were found to be rectifying and using I-V characterization a Schottky barrier height of 0.82 eV was measured. Rapid thermal annealing of the contacts was shown to significantly decrease their resistance, with contacts annealed at 800 °C for 1 min yielding the lowest resistance. When annealed at 800 °C for 1 min NiIn contacts exhibited a specific contact resistance of 8-9 × 10−3 Ω cm2 as measured by the circular transmission line model. To allow a more universal comparison the more traditional Ni/Au contacts, processed under the same conditions, were used as a standard. Their measured specific contact resistance (ρc = 1.2 − 2.1 × 10−2 Ωcm2) was significantly higher than that of the NiIn contacts. Demonstrating that NiIn has promise as an ohmic contact to p-GaN and should be studied in greater detail.

Dry Sliding Tribological Behavior of Columnar-Grained Fe2B Intermetallic Compound Under Different Loads

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Kemin Li ◽  
Zhifu Huang ◽  
Ting Min ◽  
Jiamei Liu ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Intermetallic Compound ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Laser Scanning ◽  
Tribological Behavior ◽  
Normal Load ◽  
Dry Sliding ◽  
Dynamic Friction Coefficient ◽  
Worn Surface

The dry sliding tribological behavior of a columnar-grained Fe2B intermetallic compound under different normal loads was evaluated by scanning electron microscopy (SEM), XPS, and 3D laser scanning microscope. The results indicated that under a load of 12 N, after a 35 min break-in period, the dynamic friction coefficient decreased from 0.78 to about 0.6 and this low value was maintained until the end of test. When the normal load increased from 4 N to 20 N, both the average friction coefficient and wear rate values initially decreased and then increased. The lowest values of the average friction coefficient and wear rate were obtained under a load of 12 N. As the load increased from 4 N to 12 N, a complete film formed on worn surface. Nevertheless, when the load increased to 16 N, severe self-induced vibration occurred and a corrugated ribbon appeared on the surface. Furthermore, severe damage on the worn surface was caused by cycling vibration under the 20 N load. Under 4 N and 12 N, the main wear mechanism was abrasive wear, while under a load of 20 N, fracture wear and abrasive wear were the mian wear mechanisms. The friction products were composed of B2O3, H3BO3, SiO2, and FexOy. More specifically, Fe2O3 was generated under 4 N load, Fe2O3 and Fe3O4 were produced under 12 N load, and the mixture of FeO, Fe2O3, and Fe3O4 appeared under 20 N load.

scholarly journals Tribological behavior of co-textured cylinder liner-piston ring during running-in

Friction ◽  
2021 ◽  
Author(s):  
Chenwei Miao ◽  
Zhiwei Guo ◽  
Chengqing Yuan
Keyword(s):  
Friction Coefficient ◽  
Contact Resistance ◽  
Piston Ring ◽  
Tribological Behavior ◽  
Cylinder Liner ◽  
Oil Reservoir ◽  
Piston Rings ◽  
Surface Textures ◽  
Marine Diesel ◽  
Groove Texture

AbstractThe running-in of cylinder liner-piston rings (CLPRs) is the most important process that must be performed before a marine diesel engine can be operated. The quality of running-in directly affects the reliability of a CLPR. The surface texture of a CLPR has been proven to significantly affect its lubrication performance. In this study, the tribological behavior of a CLPR during running-in is investigated. Three types of surface textures are generated on the CLPR via laser processing: dimple texture on piston rings, groove texture on cylinder liners, and co-texture on both sides. Subsequently, a series of tests are performed on a slice tester. A load of 300 N (1.64 MPa) is applied, and two speeds (50 and 100 rpm) are adopted. The CLPR running-in quality is characterized based on three parameters, i.e., the friction coefficient, contact resistance, and wear topography. Experimental results show that, compared with a non-textured surface, the three types of surface textures mentioned above improved the friction performance during running-in. The lubricant supply capacity of the dimple texture on the piston ring, as a mobile oil reservoir, is stronger than that of the groove texture on the cylinder liner serving as a static oil reservoir. By contrast, the wear resistance of the dimple texture, as a movable debris trap on the piston ring, is weaker than that of the groove texture on the cylinder liner, which serves as a static debris trap. It is demonstrated that the co-texture combines the advantages of dimples and groove textures. Compared with non-textured surfaces, the friction coefficient decreased the most at 100 rpm (44.5%), and the contact resistance improved the most at 50 rpm (352.9%). The coupling effect provides the surface with improved running-in quality by optimizing the tribological performance, particularly at the dead center. This study provides guidance for the tribological design and manufacturing of CLPR in marine diesel engines.

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