2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 8: Composite & Ceramic, Quasi-crystals and Nanomaterials
| Editors: | Kongoli F, Pech-Canul M, Kalemtas A, Werheit H |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-31-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The Investigation of the Microhardnes, Wear and Wetting Properties of Ni, Ni/SiO2 and Ni/Al2O3 Composite Coatings Produced by Electroplating Method
Ebru Taskin1; Muhammet Kartal2; Bahadyr Kuday3; Mehmet Uysal4; Orcun Yontem3; Ahmet Alp2;1, Cayyrova - Kocaeli / Turkiye, Turkey; 2SAKARYA UNIVERSITY, Sakarya, Turkey; 3TOYOTETSU, Kocaeli, Turkey; 4SAKARYA UNIVERSITY METALLURGICAL MATERIALS ENGINEERING, Sakarya, Turkey;
Type of Paper: Regular
Id Paper: 419
Topic: 18
Abstract:
Composite electrodeposition is a method including co-deposition of metal, non-metal or polymeric fine particles. During the process, insoluble reinforcements are suspended as colloidal in a traditional coating electrolyte and forced into growing metal film. The second phase may be particle, fiber or nonstructured materials such as fullerene, nanotubes, graphene. Second phase particles in the coating generally result in increasing microhardness, yield stress, tensile stress and wear resistance.
There are several methods to produce particle reinforced metal matrix composites. In recent years, electro co-deposition of particle reinforced metal matrix composites attracted much interest since it is easy applicable and its scale-up method includes both accumulated micron/nano sized polymeric and metallic/non-metallic particles in a metal/alloy matrix.
In this study, Ni/SiO2 and Ni/Al2O3 composite coatings are produced by using pulse current electrodeposition technique. Microhardness, wear resistance and wetting properties of composite coatings were examined when comparing pure metallic nickel coating. Both composite coatings showed higher microhardness and wear resistance than the pure nickel coating. The wetting angle of the pure nickel coating also increased by ceramic reinforcements. Particle sizes of ceramic powders are 80 to 100 nm, respectively. Adding the finer nano-particles into the composites increased the hardness values of pure nickel coatings. The presence of 2-3 wt % Al2O3 or 0.8 to 1.2 wt% SiO2 in the composite coating resulted in nearly two-times increment of hardness of pure nickel coating. Despite friction coefficient of alumina powders, reinforced Ni-Al2O3 composite is increased and the friction ratio of the coating is decreased regarding to the metallic nickel coating. The lowest friction coefficient and also wear ratio are obtained at the Ni/SiO2 composite. On the other hand, its wetting angle is found at the maximum value according to all coatings.
Keywords:
Composites; Microstructure;References:
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