Dry Wear Properties of Porous Copper Fabricated by Unidirectional Solidification

2007 ◽  
Vol 124-126 ◽  
pp. 1805-1808
Author(s):  
Yong Su Um ◽  
Hideo Nakajima ◽  
Hwan Goo Seong ◽  
Bo Young Hur
Keyword(s):  
Wear Test ◽  
Porous Metal ◽  
Unidirectional Solidification ◽  
Test Method ◽  
Air Bearing ◽  
Wear Properties ◽  
Porous Copper ◽  
Gas Atmosphere ◽  
Cylindrical Pores ◽  
Pin On Disk

We have been investigated application of the lotus type porous metal that is manufactured by the unidirectional solidification of the melt in pressurized gas atmosphere such as hydrogen or nitrogen for an air bearing development. In this study, wear properties of porous copper having cylindrical pores have been investigated. Generally, wear test is influenced by a shape, a wear test method, atmosphere and a way of lubrication. Wear test used pin on disk type's wear test.

scholarly journals Wear Properties of Sc-Bearing Zr-Based Composite BMG with Nano-CuZr2 under Lubrication

2020 ◽  
Vol 10 (14) ◽  
pp. 4909
Author(s):  
Shing-Hoa Wang ◽  
Chau-Chang Chou ◽  
Hsien-Hung Chung ◽  
Rong-Tan Huang ◽  
Horng-Yi Chang ◽  
...  
Keyword(s):  
Wear Rate ◽  
Wear Test ◽  
Surface Friction ◽  
Sample Surface ◽  
Optical Microscope ◽  
Wear Properties ◽  
Friction Coefficients ◽  
Adhesion Wear ◽  
Pin On Disk ◽  
New Phase

Lubricated sliding wear of amorphous (Zr55Cu30Ni10Al5)99.98Sc0.02/CuZr2 nanocrystal composite bulk metallic glasses (BMG) under various sliding velocities with a load of 20 N was investigated using the pin-on-disk test. After the wear test involving oil lubrication was performed, there was no wear induced new-phase transformation in the sample surface. Friction coefficients were within the range from 0.22 to approximately 0.29 under a 20-N load at different sliding velocities. Therefore, the calculated friction coefficients clearly indicated that the adhesion wear dominated from the experimental results. This deformation behavior resulted in a higher wear rate and wear coefficient. In addition, worn surfaces were characterized and examined under a scanning electron microscope (SEM) and optical microscope. The mechanism of high wear rate was clarified.

Theoretical Analysis of Porosity in an Ordered Porous Copper Fabricated by Continuous Unidirectional Solidification

2018 ◽  
Vol 933 ◽  
pp. 136-141
Author(s):  
Rong Cao ◽  
Qing Lin Jin
Keyword(s):  
High Pressure ◽  
Theoretical Model ◽  
Theoretical Analysis ◽  
Processing Parameters ◽  
Unidirectional Solidification ◽  
Hydrogen Gas ◽  
Porous Copper ◽  
Gas Atmosphere ◽  
Ordered Porous ◽  
Good Agreement

Ordered porous copper with elongated pores has been fabricated by a continuous unidirectional solidification method in a hydrogen gas atmosphere with high pressure. The porosity of the ordered porous copper is significantly affected by the pressure of hydrogen. A theoretical model is developed to get the relation between the porosity and the processing parameters. The calculated values are in good agreement with the experimental results. Key words: Unidirectional solidification; Ordered porous copper; Porosity; Modeling.

Investigation on Wear Behavior at High Temperature of Smooth and Bionic Non-Smooth Samples

2012 ◽  
Vol 157-158 ◽  
pp. 1628-1631
Author(s):  
Xiao Dong Yang ◽  
Zhuo Juan Yang ◽  
You Quan Chen
Keyword(s):  
High Temperature ◽  
Wear Mechanism ◽  
High Speed ◽  
Room Temperature ◽  
Wear Behavior ◽  
High Speed Steel ◽  
Wear Test ◽  
Test Method ◽  
Wear Characteristics ◽  
Pin On Disk

By using pin-on-disk wear test method, the wear behavior of W9Gr4V high speed steel with smooth and non-smooth concave samples which treated by laser texturing technology was investigated between room temperature and 500 . It was found that the anti-wear ability of the non-smooth concave samples was increased more than that of the smooth ones and the anti-wear ability of the non-smooth samples was evident than the smooth ones at temperature increasing. In this paper, the anti-wear mechanism of non-smooth concave samples and wear characteristics with smooth and non-smooth samples in high-temperature were analyzed.

Structure of Porous Copper Fabricated by Unidirectional Solidification under Pressurized Hydrogen

2010 ◽  
Vol 654-656 ◽  
pp. 1030-1033 ◽  
Author(s):  
Hao Du ◽  
Jian Zhong Qi ◽  
J.X. Wu ◽  
S.Q. Du ◽  
Tian Ying Xiong
Keyword(s):  
Pore Size ◽  
Hydrogen Pressure ◽  
High Pressures ◽  
Unidirectional Solidification ◽  
Argon Pressure ◽  
Pore Density ◽  
Porous Copper ◽  
Cylindrical Pores

Porous copper with elongated cylindrical pores were fabricated by a unidirectional solidification method in a mixture of hydrogen and argon with high pressures. The porous copper with longitudinal pores and radial pores were compared on structure. The effect of both hydrogen pressure and argon pressure on structure of the porous copper including pore size, pore density, and porosity was investigated. The reason for the effect is explained.

Tribological behavior of dental restorative composites in chewable tobacco environment

2020 ◽  
Vol 234 (10) ◽  
pp. 1106-1112
Author(s):  
Abhijeet S Suryawanshi ◽  
Niranjana Behera
Keyword(s):  
Composite Materials ◽  
Smokeless Tobacco ◽  
Tribological Behavior ◽  
Artificial Saliva ◽  
Wear Test ◽  
Dental Composite ◽  
Loading Conditions ◽  
Wear Properties ◽  
Pin On Disk ◽  
Dental Restorative

This study investigates the effect of smokeless tobacco on the tribological properties of two commercially used dental composite materials: Tetric N-Ceram and Z350 Dentin shade. It is to evaluate the effect of smokeless tobacco on the wear properties of two dental composite materials after some stipulated period. The wear test was conducted on pin-on-disk tribometer in the presence of artificial saliva under different loading conditions of 10, 15 and 20 N. The pins of the dental composite material were immersed in tobacco solution. The tribological behavior was studied after 2 days, 3.5 days, 6 days, 15 days and 1 month which represented the real conditions for the contact of 1 week, 2 weeks, 1 month, 2 months and 5 months, respectively, between the dental material and the tobacco solution. Under different loading conditions, Z350 Dentin material exhibited much less wear than the Tetric N-Ceram material in the presence of synthetic saliva for the specimen with or without tobacco immersion. The microstructure of the pin surface was inspected using scanning electron microscopy.

Porosity Measurement of Porous Copper by Unidirectional Solidification

2012 ◽  
Vol 724 ◽  
pp. 197-200
Author(s):  
Hao Du ◽  
Yuan Xia Lao ◽  
Jian Zhong Qi ◽  
Tian Ying Xiong
Keyword(s):  
Relative Density ◽  
Cross Section ◽  
Density Ratio ◽  
Porous Metal ◽  
Unidirectional Solidification ◽  
Analysis Method ◽  
Porous Metals ◽  
Image Analysis Method ◽  
Density Method ◽  
Porous Copper

Generally, there are two ways available for porosity measurement of porous metals. One is by calculating density ratio of a porous metal and a corresponding non-porous metal, called as relative density method. The other is by counting the percentage of pores on cross section of a porous metal, called as image analysis method. In this work, both methods were employed for lotus-type porous copper on porosity measurement. The effects of several parameters in both methods on porosity values of the porous copper are reported and discussed. The relative density method is recommended as porosity by this method is more reliable for the porous copper.

Fabrication of Lotus-Type Porous Copper-Aluminum Alloy by Unidirectional Solidification in Hydrogen Atmosphere

2007 ◽  
Vol 539-543 ◽  
pp. 1898-1902 ◽  
Author(s):  
Soong Keun Hyun ◽  
Tsuyoshi Awadu ◽  
Teruyuki Ikeda ◽  
Hideo Nakajima
Keyword(s):  
Aluminum Alloy ◽  
Pure Copper ◽  
Hydrogen Atmosphere ◽  
Unidirectional Solidification ◽  
Hydrogen Gas ◽  
Al Alloy ◽  
Round Shape ◽  
Porous Copper ◽  
Gas Atmosphere ◽  
Copper Aluminum

Lotus-type porous Cu-5at.%Al alloy whose elongated pores are aligned in one direction was fabricated by unidirectional solidification in pressurized hydrogen gas atmosphere. The porosity of the Cu-Al alloy was higher than that of pure copper under the same fabrication conditions because of difference in hydrogen solubility. The pore structure was not round shape because the directional pore growth was interrupted with dendrite arms formed during the solidification; the pores grew to detour the obstacle of the dendrite arms.

scholarly journals Mechanical alloying of CuFe-alumina nanocomposite: study of microstructure, corrosion, and wear properties

2018 ◽  
Vol 25 (6) ◽  
pp. 1085-1094 ◽  
Author(s):  
Mohammad Baghani ◽  
Mahmood Aliofkhazraei ◽  
Amir Seyfoori ◽  
Mehdi Askari
Keyword(s):  
Mechanical Alloying ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Wear Test ◽  
Wear Properties ◽  
Mechanically Alloyed ◽  
Corrosion Properties ◽  
Alloy Matrix ◽  
The Matrix ◽  
Pin On Disk

AbstractThe effects of adding Al2O3 nanoparticles on the microstructure, tribological, magnetic, and corrosion properties of CuFe-Al2O3 nanocomposites were investigated in this work. The mixture of Cu-25 wt.% Fe powder with 5 vol.% Al2O3 was mechanically milled. X-ray diffraction results revealed that after 60 h of mechanical alloying, CuFe solid solution was formed. Magnetic hysteresis loops of the mechanically alloyed powders were extracted at room temperature. The morphology and elemental analysis of the sintered specimens were studied by field emission scanning electron microscope (SEM). It was observed that uniform distribution and embedding of Al2O3 nanoparticles in the CuFe alloy matrix in nanocomposites were achieved, which exhibited excellent performances. Tribological properties were evaluated through a pin-on-disk wear test, and it was found that by the addition of Al2O3 nanoparticles to CuFe alloy, the weight loss rate was reduced by 30%. The existence of Al2O3 nanoparticles in the matrix of CuFe alloy causes the wear mechanism change from adhesive to abrasive, which means a considerable wear resistance was obtained in nanocomposites. The corrosion properties of the sintered samples in a solution of 3.5% NaCl were studied by potentiodynamic polarization. With the addition of Al2O3 nanoparticles, the corrosion rate of the alloy was reduced by 75%.

Sign in / Sign up

Export Citation Format

Share Document