Hardness, wear resistance and bonding strength of nano structured functionally graded Ni-Al2O3 composite coatings fabricated by ball milling method

Ni-P-SiC composite coatings on the surface of ZL102 aluminum alloy were prepared by direct electroless plating. The structure and morphology of the coatings after heat treatment at 400 °C for 1 hour were analyzed by XRD and SEM. The bonding strength, hardness, corrosion resistance and wear resistance of the coatings were tested. The results show that the coatings structure is crystalline and the main crystal phase is Ni3P. The SiC particles are evenly distributed in the coatings. The coatings have uniform thickness, high bonding strength and high micro hardness (up to 1395.28 HV.2). It is also shown that the substrate corrosion resistance and wear resistance can be considerably improved after electroless plating.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.154-155.654 ◽

2010 ◽

Vol 154-155 ◽

pp. 654-657 ◽

Cited By ~ 1

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.602-604.1700 ◽

2012 ◽

Vol 602-604 ◽

pp. 1700-1705 ◽

Cited By ~ 2

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.

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Preparation and wear resistance of pulse electrodeposited Ni–W/Al2O3 composite coatings

Applied Surface Science ◽

10.1016/j.apsusc.2011.01.089 ◽

2011 ◽

Vol 257 (15) ◽

pp. 6340-6346 ◽

Cited By ~ 82

Author(s):

Kung-Hsu Hou ◽

Yann-Cheng Chen

Keyword(s):

Wear Resistance ◽

Composite Coatings ◽

Al2o3 Composite

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

International Journal of Modern Physics B ◽

10.1142/s0217979215400214 ◽

2015 ◽

Vol 29 (10n11) ◽

pp. 1540021 ◽

Cited By ~ 1

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.

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INFLUENCE OF AL2O3 NANOPARTICLES ON HARDNESS AND WEAR RESISTANCE OF NI-P-AL2O3 COMPOSITE COATINGS PREPARED BY ELECTROLESS METHOD

17th International Multidisciplinary Scientific GeoConference SGEM2017, Nano, Bio and Green � Technologies for a Sustainable Future ◽

10.5593/sgem2017/61/s24.022 ◽

2017 ◽

Author(s):

Lucica Balint

Keyword(s):

Wear Resistance ◽

Composite Coatings ◽

Al2o3 Nanoparticles ◽

Al2o3 Composite

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Water Lubrication of Ni/Al2O3 Composite Coatings Sliding With Si3N4

Journal of Tribology ◽

10.1115/1.4046876 ◽

2020 ◽

Vol 142 (10) ◽

Cited By ~ 1

Author(s):

Jialong Huang ◽

Qingwen Dai ◽

Guanghu Jin ◽

Wei Huang ◽

Xiaolei Wang

Keyword(s):

Bonding Strength ◽

Composite Coatings ◽

Water Lubrication ◽

Particle Content ◽

Step Process ◽

Al2o3 Composite ◽

One Step ◽

Al2o3 Particles ◽

Coating Design ◽

Lubrication Properties

Abstract Inspired by the excellent water lubrication properties of Al2O3, two methods are used to fabricate Ni/Al2O3 composite coatings for water lubrication. One is the conventional composite electroplating technique (one-step process). The other is depositing the Al2O3 particles layer on a substrate by electrophoresis firstly and then plating of Ni (two-step process). The morphology of surface and cross section, composition, micro-hardness, and bonding strength of the coatings were investigated. The water lubrication properties of the coatings sliding with Si3N4 were tested and compared. The result shows that the electrophoresis combined with electroplating is an efficient way to improve the Al2O3 particles content in the coatings. With the increasing of the particle content, the coating hardness increases while the bonding strength decreases. More importantly, low friction coefficient can only be achieved for Ni/Al2O3 coating with higher particle content. The comprehensive tribo-chemical reactions of Al2O3 and Si3N4 with water could be the dominated reason. The finds evidence the benefits of the ceramic-based composite coating design for water lubrication.

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