Effect of Preparation Conditions on the Performance of Ni-TiB2-Gd2O3 Composite Coatings

2013 ◽  
Vol 815 ◽  
pp. 574-578
Author(s):  
Xiao Zhen Liu ◽  
Yu Zhen Li ◽  
Ling Ling Song ◽  
Xiao Dong Yu ◽  
Wei Ting Lu
Keyword(s):  
Weight Loss ◽  
Friction Coefficient ◽  
Cetyltrimethylammonium Bromide ◽  
Solid Lubricant ◽  
Composite Coatings ◽  
Wear Weight Loss ◽  
Preparation Conditions ◽  
Bromide Solution ◽  
Contact Surfaces ◽  
First Time

TiB2and Gd2O3were used as codeposited particles for the first time in preparing Ni-TiB2-Gd2O3composite coatings to improve its performance. Ni-TiB2-Gd2O3composite coatings were prepared by electrodeposition method from a nickel cetyltrimethylammonium bromide and hexadecylpyridinium bromide solution containing TiB2and Gd2O3particles. The content of codeposited TiB2and Gd2O3in the composite coatings was controlled by the addition of different TiB2and Gd2O3particles concentrations in the solution, respectively. The effects of TiB2and Gd2O3content on microhardness, wear weight loss, and friction coefficient of composite coatings were investigated, respectively. Ni-TiB2-Gd2O3composite coatings shows higher microhardness and lower wear weight loss, friction coefficient than those of the pure Ni coating and Ni-TiB2composite coatings. The wear weight loss of Ni-TiB2-Gd2O3composite coatings is lower 9.13 and 1.59 times than that of the pure Ni coating and Ni-TiB2composite coatings, respectively. The friction coefficients of pure Ni coating, Ni-TiB2and Ni-TiB2-Gd2O3composite coatings are 0.723, 0.815 and 0.43, respectively. Ni-TiB2-Gd2O3composite coatings shows the least friction coefficient among the three coatings. Gd2O3particles in composite coatings serves as solid lubricant between contact surfaces, decreases the friction coefficient, abates the wear and increases the corrosion resistance of the composite coatings. The loading-bearing capacity and the wear-reducing effect of the Gd2O3particles in the composite coatings are closely related to the content of Gd2O3particles in the composite coatings.

The Wear Behavior of Pulse Current Electroforming Ni-P-SiC Composite Coatings

2007 ◽  
Vol 364-366 ◽  
pp. 358-363 ◽  
Author(s):  
Kung Hsu Hou ◽  
Ming Chang Jeng ◽  
Yung Kang Shen ◽  
Ming Der Ger
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Pulse Current ◽  
Wear Behavior ◽  
Composite Coatings ◽  
Wear Weight Loss ◽  
Sic Particles ◽  
The Coefficient Of Friction ◽  
Worn Surface ◽  
The Relationship

In this study, the SiC particles with a mean diameter of 300nm were used to be codeposited with Ni-P base to produce Ni-P-SiC composite coatings by means of the pulse current electroforming technology. The relationship between the SiC particles and phosphorous contents in the composite coatings has been constructed. The wear behavior of the Ni-P-SiC composite coatings was examined by that measurements data including the wear weight loss, the coefficient of friction, and the temperature increments under the wear tests, in which were correlated to the observation and analysis of the worn surface of the composite coatings. Experimental results show that the wear resistance of Ni-P-SiC composite coatings is superior to Ni-P composite coatings, if they are under the same level of hardness. In addition, the wear weight loss of Ni-P-SiC composite coatings is even about 62% less than that of Ni-P composite coatings, if they are based on the same production conditions. Further more, both the hardness and wear resistance of Ni-P-SiC composite coatings are superior to pure Ni coating, wherein its wear resistance is even up to 10 times better than that of pure Ni coating.

scholarly journals Composite Coatings with Ceramic Matrix Including Nanomaterials as Solid Lubricants for Oil-Less Automotive Applications

2016 ◽  
Vol 61 (2) ◽  
pp. 1039-1043 ◽  
Author(s):  
A. Posmyk ◽  
J. Myalski ◽  
B. Hekner
Keyword(s):  
Carbon Nanotubes ◽  
Shear Strength ◽  
Friction Coefficient ◽  
Solid Lubricant ◽  
Composite Coatings ◽  
Ceramic Matrix ◽  
Solid Lubricants ◽  
Metal Nanowires ◽  
Theoretical Point ◽  
Low Shear

Abstract The paper presents the theoretical basis of manufacturing and chosen applications of composite coatings with ceramic matrix containing nanomaterials as a solid lubricant (AHC+NL). From a theoretical point of view, in order to reduce the friction coefficient of sliding contacts, two materials are required, i.e. one with a high hardness and the other with low shear strength. In case of composite coatings AHC+NL the matrix is a very hard and wear resistant anodic oxide coating (AHC) whereas the solid lubricant used is the nanomaterial (NL) featuring a low shear strength such as glassy carbon nanotubes (GC). Friction coefficient of cast iron GJL-350 sliding against the coating itself is much higher (0.18-0.22) than when it slides against a composite coating (0.08-0.14). It is possible to reduce the friction due to the presence of carbon nanotubes, or metal nanowires.

Preparation of Electrodeposited Cr-Nd Coating and its Properties

2013 ◽  
Vol 803 ◽  
pp. 235-238 ◽  
Author(s):  
Xiao Zhen Liu ◽  
Bo Zhang ◽  
Ling Ling Song ◽  
Xiao Dong Yu ◽  
Yan Shen
Keyword(s):  
Weight Loss ◽  
Friction Coefficient ◽  
Micro Hardness ◽  
Electrodeposition Method ◽  
Wear Weight Loss ◽  
Coating Surface ◽  
Cr Coating

Cr-Nd coating was prepared by electrodeposition method. The microhardness, wear weight loss and friction coefficient of Cr-Nd coating were studied respectively. The Cr-Nd coating were characterized with ICP-AES, EDAX, XRD and SEM techniques, respectively. The micro-hardness and the wear weight loss, friction coefficient of the Cr-Nd coatings are higher and lower respectively than that of the Cr coating. The microhardness of the Cr-Nd is as high as 815.6 HV, which is higher 4.16% than that of the Cr coating (783.0 HV). The wear weight loss of Cr-Nd is lower 1.33 times than that of Cr coating. The friction coefficient of Cr coating and Cr-Nd coating are 0.896 and 0.714 respectively. There are crystalline CrC in Cr-Nd coating. There are nodules on Cr coating surface. There are not nodules on Cr-Nd coating surface. Cr-Nd coating surface is smooth.

Preparation and Properties of Ni-TiB2-Gd2O3 Composite Coatings by Electrodepositon

2013 ◽  
Vol 387 ◽  
pp. 32-35
Author(s):  
Xiao Zhen Liu ◽  
Wei Wei Qu ◽  
Ling Ling Song ◽  
Xiao Dong Yu ◽  
Ting Rao
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Composite Coatings ◽  
Atomic Emission ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bromide Solution ◽  
Scanning Electron Microcopy ◽  
The Matrix ◽  
Atomic Emission Spectrometer ◽  
Scanning Electron

Ni-TiB2-Gd2O3 composite coatings were prepared by electrodeposition method from a nickel cetyltrimethylammonium bromide and hexadecylpyridinium bromide solution containing TiB2 and Gd2O3 particles. The composite coatings were characterized with X-ray diffraction (XRD), atomic emission spectrometer (ICP-AES), scanning electron microcopy (SEM) and energy- dispersive analyses of X-ray (EDAX), respectively. That the codesposition of TiB2 and Gd2O3 into the coatings were demonstrated by XRD, EDAX, ICP-AES and SEM. TiB2 and Gd2O3 entered the lattice of Ni. The incorporation of TiB2 and Gd2O3 particles in the matrix can largely reduce the wear of the nickel composite coatings.

Preparation and Performance of Electrodeposited Cr-Pr Coating

2014 ◽  
Vol 490-491 ◽  
pp. 177-180
Author(s):  
Xiao Zhen Liu ◽  
San San Wang ◽  
Xiao Zhou Liu ◽  
Jie Chen ◽  
Xin Li ◽  
...  
Keyword(s):  
Weight Loss ◽  
Friction Coefficient ◽  
Electrodeposition Method ◽  
Wear Weight Loss ◽  
Coating Surface ◽  
And Performance ◽  
Cr Coating ◽  
Worn Surface

Cr-Pr coating was prepared by electrodeposition method. The microhardness, wear weight loss and friction coefficient of Cr-Pr coating were studied respectively. The Cr-Pr coating were characterized with ICP-AES, EDAX, XRD and SEM techniques, respectively. The microhardness and the wear weight loss, friction coefficient of the Cr-Pr coatings are higher and lower respectively than that of the Cr coating. The microhardness of the Cr-Pr is as high as 805.2 HV, which is higher 3.74% than that of the Cr coating (776.2 HV). The wear weight loss of Cr-Pr is lower 1.33 times than that of Cr coating. The friction coefficient of Cr coating and Cr-Pr coating are 0.884 and 0.723 respectively. There are crystalline CrC in Cr-Pr coating. The nodules on Cr-Pr coating surface are smaller than that of Cr coating surface, and furrows and spalling are lower on the worn surface of Cr-Pr coating than that of the Cr coating.

Study of Friction and Wear Behavior of Ni-P-β-SiC Composition Coating on Aluminum Alloy

2014 ◽  
Vol 809-810 ◽  
pp. 676-681
Author(s):  
Da Wei Yi
Keyword(s):  
Weight Loss ◽  
Aluminum Alloy ◽  
Friction Coefficient ◽  
Composite Coating ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Test Results ◽  
Friction And Wear Behavior ◽  
Wear Weight Loss ◽  
Coefficient Increase

Ni-P-β-SiC was prepared using different granularity β-SiC and rolling electroless plating technology. The test results show that β-SiC particles in composite coating are uniform, and the thickness and hardness of composite coating are 17~25μm and 520~620HV, respectively. At the same time, the friction and wear behavior of Ni-P-β-SiC composition coating have been studied. The results show that the wear weight loss decrease and the friction coefficient increase with the increase of β-SiC granularity.

scholarly journals The Effect of Co-Deposition of SiC Sub-Micron Particles and Heat Treatment on Wear Behaviour of Ni–P Coatings

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 180
Author(s):  
Donya Ahmadkhaniha ◽  
Lucia Lattanzi ◽  
Fabio Bonora ◽  
Annalisa Fortini ◽  
Mattia Merlin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Friction Coefficient ◽  
Wear Mechanisms ◽  
Composite Coatings ◽  
Wear Behaviour ◽  
Maximum Hardness ◽  
Sic Particles ◽  
Heat Treated ◽  
The Coefficient Of Friction ◽  
The Difference

The purpose of the study is to assess the influence of SiC particles and heat treatment on the wear behaviour of Ni–P coatings when in contact with a 100Cr6 steel. Addition of reinforcing particles and heat treatment are two common methods to increase Ni–P hardness. Ball-on-disc wear tests coupled with SEM investigations were used to compare as-plated and heat-treated coatings, both pure and composite ones, and to evaluate the wear mechanisms. In the as-plated coatings, the presence of SiC particles determined higher friction coefficient and wear rate than the pure Ni–P coatings, despite the limited increase in hardness, of about 15%. The effect of SiC particles was shown in combination with heat treatment. The maximum hardness in pure Ni–P coating was achieved by heating at 400 °C for 1 h while for composite coatings heating for 2 h at 360 °C was sufficient to obtain the maximum hardness. The difference between the friction coefficient of composite and pure coatings was disclosed by heating at 300 °C for 2 h. In other cases, the coefficient of friction (COF) stabilised at similar values. The wear mechanisms involved were mainly abrasion and tribo-oxidation, with the formation of lubricant Fe oxides produced at the counterpart.

scholarly journals Influences of the selected additives on the weight loss and organoleptic properties of marinated mussels and squids

2012 ◽  
Vol 81 (3) ◽  
pp. 263-267 ◽  
Author(s):  
Metin Guldas ◽  
Canan Hecer
Keyword(s):  
Weight Loss ◽  
Salt Content ◽  
Meat Products ◽  
Organoleptic Properties ◽  
Highest Weight ◽  
Konjac Flour ◽  
Weight Gains ◽  
Before And After ◽  
Mouth Feel ◽  
First Time

Effects of seven different solutions prepared from various additives (carrageenan, konjac flour, phosphate, yeast extract, xanthan gum and maltodextrin) were used to test for the first time in the marination of experimental seafood. The additives were added into the marination solutions and the samples were analyzed before and after marination. Statistically, the experimental solutions did not cause significant changes in pH, acidity and salt content of the samples (P < 0.05). The highest weight gains were obtained from the solution which contained 0.1% of konjac flour (E425 I) as 4.01, 5.21, 4.61 and 4.88 % in the mussels, big squids, diced squids and small squids, respectively. However, this solution was not preferred by the panellists because of its sticky texture. Inversely to red meat products, the solution containing phosphate caused weight loss during marination. The results indicate that the solution containing 0.2% carrageenan LM (low methoxyl) was the best solution in the marination process. Dipping into this solution caused weight gains of 4.69, 2.98, 4.04 and 2.78% in the big squids, the mussels, the small squids and the diced squids, respectively (P < 0.01). The organoleptic properties (mouth feel, flavour and softness) of mussels and squids were also improved by carrageenan LM addition.

Worm gear wear and coefficient of efficiency during their running-in period

2021 ◽  
pp. 22-25
Author(s):  
Keyword(s):  
Friction Coefficient ◽  
Velocity Vector ◽  
Worm Gear ◽  
Worm Gears ◽  
Contact Surfaces

The process of worm gear wear is considered. The reasons for the change in the coefficient of efficiency of worm gears during the running-in period are analyzed. Keywords: worm gear, line of engagement, contact surfaces, involute worm, velocity vector, friction coefficient. [email protected]

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