Hardness and Wear Resistance of Ni/Al2O3 Composite Coatings by Electrodeposition

2010 ◽  
Vol 154-155 ◽  
pp. 654-657 ◽  
Author(s):  
Li Min Chang ◽  
Jian Hua Liu ◽  
Rui Jun Zhang
Keyword(s):  
Wear Resistance ◽  
Cross Section ◽  
Pulse Current ◽  
Composite Coatings ◽  
Single Pulse ◽  
Al2o3 Content ◽  
Measuring Device ◽  
Al2o3 Composite ◽  
Fine Microstructure ◽  
Stress Measuring

Ni/Al2O3 composite coatings were prepared by direct current (DC), single pulse current (PC) and pulse reversal current (PRC), respectively. The hardness and wear resistance of the coatings were investigated and the morphology and elements distribution in cross-section were analyzed by the application of SEM/EDS, XRF and XRD equipped with stress measuring device. The results show that the hardness of the three kinds of coatings increase with increasing Al2O3 content. The coating prepared by PRC plating exhibits higher hardness and better wear resistance, while that of DC plating has lower hardness and poorer wear resistance. The higher hardness and better wear resistance of coating of PRC plating can be ascribed to fine microstructure and weaker stress between substrate and coatings.

Effect of surfactant on the electrodeposition and wear resistance of Ni–Al2O3 composite coatings

2006 ◽  
Vol 434 (1-2) ◽  
pp. 319-325 ◽  
Author(s):  
Li Chen ◽  
Liping Wang ◽  
Zhixiang Zeng ◽  
Junyan Zhang
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Al2o3 Composite

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.

Mechanical Milling Prepared Nano-Sized Al2O3 Particles Utilized in Electroless Plating Ni-P- Al2O3 Composite Coatings

2012 ◽  
Vol 602-604 ◽  
pp. 1700-1705 ◽  
Author(s):  
Ai Zhi Yu ◽  
Mao Dong Li ◽  
Jin Mei Lin ◽  
Shu Kuan Zhang
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Wear Resistance ◽  
Mechanical Milling ◽  
Chemical Method ◽  
Composite Coatings ◽  
Micro Hardness ◽  
Mechanical Method ◽  
Al2o3 Composite ◽  
Steel Substrates

In this paper, nano-sized Al2O3 particles were prepared by mechanical milling, and Ni-P-Al2O3 composite coatings were plated on Q235 steel substrates, which plating solutions were containing different concentrations Al2O3 particles. The morphology, phase and particle size distribution of the as-prepared Al2O3 particles, and the properties of the coatings were investigated. The results show that, the morphology of the as-prepared Al2O3 particles were spherical and almost size under 100nm, the coatings were uniformly thickness and the Al2O3 particles were uniformly dispersed in the coatings, after heat treatment, the micro-hardness and wear resistance of the coatings were significantly improved, compared with the chemical method prepared Al2O3 particles, the mechanical method prepared Al2O3 particles had the same performance in improving the micro-hardness of the coatings.

scholarly journals The Wear Behavior of the Laser Cladded Ti-Al-Si Composite Coatings on Ti-6Al-4V Alloy with Additional TiC

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4567
Author(s):  
Ran Liu ◽  
Xianting Dang ◽  
Yuan Gao ◽  
Tao Wu ◽  
Yuanzhi Zhu
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Composite Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Laser Cladding Process ◽  
Fine Microstructure ◽  
The Coefficient Of Friction ◽  
Formation Of Cracks ◽  
Different Content

In this study, the Ti-Al-Si + xTiC (x = 0, 2, 6, 10 wt.%) composite coatings, each with a different content of TiC were fabricated on a Ti-6Al-4V alloy by laser surface cladding. The microstructure of the prepared coatings was analyzed by the scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The microhardness and the wear resistance of these coatings were also evaluated. The results show that α-Ti, Ti3Al, Ti5Si3, TiAl3, TiAl, Ti3AlC2 and TiC particles can be found in the composites. The microstructure can obviously be refined by increasing the content of TiC particles, while the microhardness increases and the coefficient of friction decreases. The Ti-Al-Si-6TiC composite shows the best wear resistance, owing to its relatively fine microstructure and high content of TiC particles. The microhardness of this coating is 5.3 times that of the substrate, while the wear rate is only 0.43 times. However, when the content of TiC was up to 10 wt.%, the original TiC could not be dissolved completely during the laser cladding process, leading to formation of cracks on the coatings.

Influence of Al2O3 sol concentration on the microstructure and mechanical properties of Cu–Al2O3 composite coatings

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540021 ◽  
Author(s):  
Xiaojin Wei ◽  
Zhendi Yang ◽  
Ying Tang ◽  
Wei Gao
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Composite Coatings ◽  
Nanocomposite Coatings ◽  
Wear Volume ◽  
Vickers Hardness Number ◽  
Microstructure And Mechanical Properties ◽  
Al2o3 Composite ◽  
Electrical Conducting ◽  
Pure Cu

Copper ( Cu ) is widely used as electrical conducting and contacting material. However, Cu is soft and does not have good mechanical properties. In order to improve the hardness and wear resistance of Cu , sol-enhanced Cu – Al 2 O 3 nanocomposite coatings were electroplated by adding a transparent Al oxide ( Al 2 O 3) sol into the traditional electroplating Cu solution. It was found that the microstructure and mechanical properties of the nanocomposite coatings were largely influenced by the Al 2 O 3 sol concentration. The results show that the Al 2 O 3 nanoparticle reinforced the composite coatings, resulting in significantly improved hardness and wear resistance in comparison with the pure Cu coatings. The coating prepared at the sol concentration of 3.93 mol/L had the best microhardness and wear resistance. The microhardness has been improved by ~20% from 145.5 HV (Vickers hardness number) of pure Cu coating to 173.3 HV of Cu – Al 2 O 3 composite coatings. The wear resistance was also improved by ~84%, with the wear volume loss dropped from 3.2 × 10-3 mm3 of Cu coating to 0.52 × 10-3 mm3 of composite coatings. Adding excessive sol to the electrolyte deteriorated the properties.

scholarly journals Surface modification of Ti alloys with WC-TiB2-reinforced laser composite coatings

2016 ◽  
Vol 23 (6) ◽  
pp. 737-741
Author(s):  
Jianing Li ◽  
Yuanbin Zhang ◽  
Hui Luo ◽  
Shuili Gong ◽  
Peng Li ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Amorphous Alloys ◽  
Composite Coatings ◽  
Stabilized Zirconia ◽  
Reinforced Composite ◽  
Ti Alloys ◽  
Metallurgical Bonding ◽  
Fine Microstructure ◽  
Yttria Partially Stabilized Zirconia

AbstractLaser cladding of the TiAl/Fe+Co-coated WC+TiB2 pre-placed mixed powders on a Ti-6Al-4V alloy substrate can be used to form TiB2/α-W2C-reinforced composite coating, which improved the wear resistance of the substrate. To further improve the TiB2/α-W2C-reinforced composite coating, yttria partially stabilized zirconia (YPSZ) was added into the pre-placed powders. A metallurgical bonding was formed between the YPSZ-infused composite coating and the substrate. Many amorphous alloys were produced in this composite coating due to the action of YPSZ, and such coating showed fine microstructure. Thus, it is feasible to further improve the wear resistance of the laser clad TiB2/α-W2C-reinforced composite coating through the addition of YPSZ.

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