Tribological Characterization of Electroless Ni–B Coatings Formed on Commercial Purity Magnesium

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
E. Correa ◽  
J. F. Mejía ◽  
J. G. Castaño ◽  
F. Echeverría ◽  
M. A. Gómez
Keyword(s):  
Sliding Wear ◽  
Parametric Optimization ◽  
Commercial Purity ◽  
Electroless Coating ◽  
Friction Testing ◽  
Wear And Friction ◽  
Electroless Coatings ◽  
Tribological Characterization ◽  
Electroless Ni

Ni–B coatings have been deposited directly on commercial purity magnesium and evaluated by means of sliding wear and friction testing. The nickel and boron are distributed throughout the whole thickness of the coating. Parametric optimization has been carried out using the design of experiment based on Taguchi analysis. The friction coefficients of the coatings vary between 0.01 and 0.3, depending on the evaluated conditions. The lowest wear rate of the coating was 0.19 × 10−5 mm3 N−1 m−1. Wear and friction coefficient maps of Ni–B electroless coatings formed on magnesium surfaces are reported. Nanoparticles present in the lubricating fluid act as a third wear body increasing the wear of the electroless coating

Tribological characteristics of diamond-like films deposited with an are-discharge method

1990 ◽  
Vol 5 (11) ◽  
pp. 2524-2530 ◽  
Author(s):  
J-P. Hirvonen ◽  
R. Lappalainen ◽  
J. Koskinen ◽  
A. Anttila ◽  
T. R. Jervis ◽  
...  
Keyword(s):  
Sliding Wear ◽  
Wear Track ◽  
Carbon Film ◽  
Hardened Steel ◽  
Dry Sliding Wear ◽  
Transfer Layer ◽  
Maximum Value ◽  
Wear And Friction ◽  
Discharge Method

Using an are-discharge method, we deposited a diamond-like carbon film 600 nm thick on hardened steel. Characterization of the film was carried out with Raman spectroscopy. In dry sliding wear and friction tests, with a hardened steel pin as a counterpart, we obtained a friction coefficient between 10000 and 20000 cycles, with the maximum value of 0.18. The value decreased to 0.12 after about 100000 cycles. We obtained a wear coefficient of 7 × 10−17 m3/mN. A transfer layer formed on the pin during sliding and probably had the dominating effect on the tribological behavior. We observed in nanoindentation measurements that the film softened in a wear track during the first 20000 cycles. Although fracture pits on the wear track occurred, fracture is not the dominant failure mechanism of these films. Degradation of good tribological properties was caused mainly by partial wear-through of the film after 370000 cycles and by a subsequent redeposition of the transfer film on the wear track during prolonged sliding.

scholarly journals Production and Characterization Of Electroless Ni Coated Fe-Co Composite Using Powder Metallurgy In Microwave Furnace

2021 ◽  
Author(s):  
Assoc. Prof. Dr. Ahmet YONETKEN
Keyword(s):  
Structural Data ◽  
Metallic Phase ◽  
Neutral Atmosphere ◽  
X Ray Diffraction ◽  
Electroless Coating ◽  
Microwave Furnace ◽  
Furnace Sintering ◽  
Atmosphere Environment ◽  
Electroless Ni

Abstract The specimens, magnetic properties materials, and microwave characteristics of Ni coated Fe and Co composites were researched by specimens produced by microwave furnace sintering at 1100°C temperature. A uniform nickel deposit on Fe-Co particles was coated previously to sintering by electroless coating deposition procedure. A composite consisting of quaternary additions, a metallic phase, Fe-Co inside of Ni matrix has been prepared under in a neutral atmosphere environment then microwave sintered. X-Ray Diffraction, SEM(Scanning-Electron-Microscope), Empedans Phase Analyzer were utilized to obtain structural data and to determine magnetic and electrical features such as dielectric and conductivity at the temperature range of 25-400C. The ferromagnetic resonance varied from 10 Hz to 1GHz and measurements were employed to characterize the features of the specimens. Empirical of findings obtained for the composition (Fe-%25Co)50Ni at 1100°C recommend that the best conductivity and hardness were obtained with 50Ni addition at a sintering temperature of 1100°C.

Micro/nanoscale structural, mechanical and tribological characterization of ZA-27/SiC nanocomposites

2019 ◽  
Vol 54 (16) ◽  
pp. 2113-2129
Author(s):  
Miroslav Babic ◽  
Blaza Stojanovic ◽  
Dragan Dzunic ◽  
Marko Pantic
Keyword(s):  
Matrix Material ◽  
Matrix Alloy ◽  
Density Level ◽  
Friction Behavior ◽  
Sic Nanoparticles ◽  
Mechanical And Tribological Properties ◽  
Wear And Friction ◽  
Nanoparticle Content ◽  
Tribological Characterization

The structural, mechanical and tribological properties of ZA-27/SiC nanocomposites were investigated at micro/nanoscale. The nanocomposites with different volume fractions of nano-sized SiC particles were produced using the compocasting technique. The microstructure of nanocomposites was characterized with formation of SiC nano agglomerates, which were relatively uniformly distributed. The increase in SiC content contributed to the uniformity of their distribution. Also, the phenomenon of particle segregation in the form of particle-rich clusters, as well as particle-porosity clusters, was identified. The density level of composites decreased with the increase of the SiC content. The porosity followed a reverse trend. The tendency for formation of local particle-porosity clusters was the highest in ZA-27/1% SiC nanocomposite, causing the highest level of porosity. Increasing percentage of SiC content was followed by the increase in micro/nanohardness of the composites. The results of micro/nanoscale tribotests revealed that the reinforcing with SiC nanoparticles significantly improved wear and friction behavior of ZA-27 matrix alloy. The rate of improvement increased with the increase of SiC nanoparticle content, load, and sliding speed. The highest degree of changes corresponded to the change of the SiC nanoparticle content from 0 to 1 wt%. The further decrease of wear with SiC content (from 1 to 5 wt%) was almost linear. The different tribological behavior of tested ZA-27 matrix and ZA-27/SiC nanocomposites was influenced by differences of intensity of adhesion resulted in transferred layers of matrix material onto worn surfaces of Al2O3 ball counterpart. The intensity of adhesion significantly decreased with the increase of SiC nanoparticle content.

scholarly journals Tribological characterization of electroless Ni-P-Cu-TiO2 coatings

2021 ◽  
Vol 1080 (1) ◽  
pp. 012022
Author(s):  
Anupam Jana ◽  
Supriyo Roy ◽  
Bal Mukund Mishra ◽  
Goutama Kumar Bose
Keyword(s):  
Tio2 Coatings ◽  
Tribological Characterization ◽  
Electroless Ni

scholarly journals Preparation and characterization of electroless Ni coated nano alumina powder under different sensitization - activation conditions

10.30544/467 ◽  
2020 ◽  
Author(s):  
Sameer Kumar Devarakonda ◽  
Naga Sai Suman K ◽  
Kalyana Krishna Y
Keyword(s):  
Alumina Powder ◽  
Metallic Ions ◽  
Nano Alumina ◽  
Characterization Studies ◽  
Electroless Coatings ◽  
Activation Conditions ◽  
Average Size ◽  
Electroless Ni

The development of electroless coatings on various substrates has gained much interest among researchers for the sake of improved properties. However, the coating on ceramic particles as a source of reinforcement is still a challenge for the researchers and requires a good comprehension of fundamentals since the coating thickness relies upon many parameters. Particularly the sensitization and activation conditions are more important for the creation of an ideal environment to draw metallic ions as a coating layer. Therefore, this paper examines the role of sensitization and activation conditions on the viability of nickel coating on the alumina particles of an average size of 50 nm. A comparison is made between two environments, namely individual and blended activations in the preparation of coated particles. Characterization studies are also presented to support the discussion. 

Topographical and tribological characterization of some ceramic and stainless steel brackets

2016 ◽  
Vol 58 (7-8) ◽  
pp. 608-611
Author(s):  
Violeta Merie ◽  
Viorica Ţărmure ◽  
Simion Haragâş ◽  
Andreea Pop
Keyword(s):  
Stainless Steel ◽  
Tribological Characterization
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