Electroless Nickel-PTFE Composite Coatings
01 Jan 1983-Transactions of The Institute of Metal Finishing (Taylor & Francis)-Vol. 61, Iss: 1, pp 147-149
TL;DR: The scope of electroless nickel has been increased by codepositing materials such as silicon carbides, ceramics, diamonds and fluoropolymers as mentioned in this paper, which is achieved by taking advantage of different but complementary materials.
Abstract: The scope of electroless nickel has been increased by codepositing materials such as silicon carbides, ceramics, diamonds and fluoropolymers. This is achieved by taking advantage of different but o...
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TL;DR: In this article, electroless Ni-SiC composite deposits with various amounts of SiC have been prepared and characterized, and the study of the mechanical (hardness) and tribological (friction resistance and wear) properties of the co-deposits were carried out using a ball on disk tribometer.
Abstract: Composite coatings constitute a new class of materials which are mostly used for mechanical and tribological applications. Among these materials, nickel deposits with incorporation of hard ceramic particles such as silicon carbide (SiC), combine anti-corrosion properties (due to the presence of nickel), with mechanical and tribological performances (due to the presence of particles of SiC). In the present study, electroless Ni–SiC composite deposits with various amounts of SiC have been prepared and characterized. The first part of this paper considers the materials, the experimental conditions and the characterization of the coatings. The second part is dedicated to the study of the mechanical (hardness) and tribological (friction resistance and wear) properties of the co-deposits. Friction tests were carried out using a ball on disk tribometer. The mechanisms of wear were analysed from observations of the wear scars and their characterization using two-dimensional and three-dimensional profilometry. The results show that increasing the size or the rate of SiC particles incorporated lead to an increase in both the hardness of the films and friction coefficient when sliding against a steel ball.
177 citations
TL;DR: In this article, hardness and wear resistance of two types of electroless coating have been investigated including Ni-P and Ni−P-Al 2 O 3 coatings, which were applied on AISI 1045 steel discs by electroless deposition process and then they were heat treated at 200, 400 and 600°C for 1h.
164 citations
TL;DR: In this paper, the effects of surfactants on codeposition of PTFE particles with electroless Ni-P coating were investigated and a theoretical model was proposed to provide a more deep insight into the codenosition behaviors.
110 citations
TL;DR: In this article, the influence of surface properties of corrugated heat exchanger plates on calcium sulpate crystallization fouling from aqueous salt solutions was investigated, and the applied surface treatment technologies for the heat exchange plates are ion beam implantation, ion sputtering, carbo-nitriding & oxidizing, and Ni-P-PTFE coating.
Abstract: The scope of the present work was to investigate the influence of surface properties of corrugated heat exchanger plates on calcium sulpate crystallization fouling from aqueous salt solutions. The applied surface treatment technologies for the heat exchanger plates are ion beam implantation, ion sputtering, carbo-nitriding & oxidizing, and Ni-P-PTFE coating. Ten pairs of Alfa Laval M3 heat exchanger plates were treated with these techniques and used for this study. Other process parameters such as temperature, solution composition, flow velocity, and the corrugation inclination angle of the plates were kept constant in order to allow for a comparison between the different surface treatments. To evaluate the influence of surface roughness on CaSO4 crystallization fouling, one pair of plates was electropolished. Surface energy and surface roughness measurements were carried out to characterize the treated surfaces.
101 citations
Cites background from "Electroless Nickel-PTFE Composite C..."
...Hadley and Harland [21] and Roberto [23] give typical characteristics for electroless Ni-P-PTFE coatings as follows: 84....
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...According to Hadley and Harland [21], a deposit thickness between 6....
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...Hadley and Harland [21] and Roberto [23] give typical characteristics for electroless Ni-P-PTFE coatings as follows: 84.6 wt% Ni, 7.0 wt% P, and 8.4 wt% PTFE....
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...According to Hadley and Harland [21], a deposit thickness between 6.35 and 12.7 µm has been found to be satisfactory for most applications....
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TL;DR: In this paper, the effects of the addition of three types of surfactants (cationic, anionic, non-ionic) at different concentrations in the plating bath on the deposition rate, PTFE content and surface morphology of electroless Ni-P/PTFE composite coatings were investigated.
94 citations