Preparation and Characterization of Electroless Ni-P and Ni-P-Si3N4 Composite Coatings
01 Jan 1999-Transactions of The Institute of Metal Finishing (Taylor & Francis)-Vol. 77, Iss: 2, pp 84-86
TL;DR: In this paper, the study of electroless Ni-P and NiP-Si3N4 composite coatings is presented, which are obtained from a proprietary high phosphorus electroless nickel plating bath, comprising nickel sulphate, sodium hypophosphite, complexing agents and stabilizers.
Abstract: SUMMARYThe present work pertains to the study of electroless Ni-P and Ni-P-Si3N4 composite coatings. The deposits are obtained from a proprietary high phosphorus electroless nickel plating bath, comprising nickel sulphate, sodium hypophosphite, complexing agents and stabilizers. The maximum weight percent of Si3N4 incorporated in the electroless deposit is obtained at a concentration of 10 g/l in the bath. The electroless Ni-P deposits having 0%, 2.01%, 5.81% and 8.10% of Si3N4, respectively, obtained from baths containing 0, 2, 5 and 10 g/l of Si3N4, are characterized by optical microscopy, XRD and TEM. Hardness is found to increase with the incorporation of Si3N4 at all heat treatment temperatures studied. Also hardness increases with an increase in weight percent of Si3N4 incorporated in the deposit. The analyses of the composite coatings by XRD and TEM reveal that the inclusion of Si3N4 particles does not change the amorphous nature of the Ni-P matrix.
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TL;DR: The development of metal deposition processes based on electroless nickel, alloy and composite coatings on various surfaces has witnessed a surge in interest among researchers, with many recent applications made possible from many excellent properties as mentioned in this paper.
680 citations
TL;DR: In this paper, high phosphorus electroless nickel bath has been used to prepare composite coatings containing alumina powders (50 nm, 0.3 μm and 1.0 μm).
Abstract: High phosphorus electroless nickel bath has been used to prepare composite coatings containing alumina powders (50 nm, 0.3 μm and 1.0 μm). Deposits were characterized for its structure, morphology and hardness. Incorporation of particle has a marginal influence on the composition. More amount of particle incorporation and uniform distribution was found in composite coatings obtained with 1.0-μm (C3) alumina particles compared to 50-nm (C1) and 0.3-μm (C2) alumina particles. XRD results showed a broad peak of nickel and low intensity alumina peaks present in C3 composite coating in as-plated condition. A marginal improvement in hardness was noticed in as-plated composite coatings. A 15% increase in microhardness was observed in the heat-treated (400 °C for 1 h) composite coatings. Potentiodynamic polarization measurements made on these deposits in 3.5% sodium chloride solution showed that uniform corrosion occurred in C1 and C2 composite coatings whereas localized corrosion was observed in C3 composite coating.
168 citations
TL;DR: In this paper, the friction behavior and wear mechanism of Ni-P matrix composites with PTFE and/or SiC particles composite coating are investigated by virtue of ring-on-disk wear machine at a high load of 150 N.
127 citations
Patent•
03 Aug 2010TL;DR: In this paper, a disk for a hard disk drive is described, which consists of a substrate comprising aluminum and a coating layer disposed over the substrate, and the coating layer comprises an alloy of Ni, X 1 and X 2, wherein X 1 comprises one or more elements selected from the group consisting of Ag, Au, B, Cr, Cu, Ga, In, Mn, Mo, Nb, Pb, Sb, Se, Sn, Te, W, Zn and Zr.
Abstract: A disk for a hard disk drive is provided. The disk comprises a substrate comprising aluminum, and a coating layer disposed over the substrate. The coating layer comprises an alloy of Ni, X 1 and X 2 , wherein X 1 comprises one or more elements selected from the group consisting of Ag, Au, B, Cr, Cu, Ga, In, Mn, Mo, Nb, Pb, Sb, Se, Sn, Te, W, Zn and Zr, and wherein X 2 comprises either B or P, and wherein X 1 and X 2 do not comprise the same elements.
79 citations
TL;DR: In this article, the tribological behavior and wear mechanism of Ni-P-Gr (graphite)-SiC (manufactured by electroless plating) was surveyed using scanning electron microscopy (SEM) and energy-dispersive analysis of X-ray (EDAX).
70 citations
References
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TL;DR: For most practical applications, 20 to 25 percent by volume silicon carbide powder is incorporated into electroless deposited metals as mentioned in this paper, which is an economic method of producing composite coatings.
Abstract: Embedding particles in electroless deposited metals is an economic method of producing composite coatings. For most practical applications 20–25 percent by volume silicon carbide powder is incorpor...
12 citations
Journal Article•
TL;DR: Etude de l'inclusion de particules d'alumine lors du depot chimique d'alliages Ni-P et de son influence sur la microstructure and la durete des revetements obtenus as mentioned in this paper.
Abstract: Etude de l'inclusion de particules d'alumine lors du depot chimique d'alliages Ni-P et de son influence sur la microstructure et la durete des revetements obtenus
11 citations
TL;DR: In this paper, the wear resistance of an electroless co-deposited Ni-8.73% P-SiC coating has been studied and the effects of microstructure and properties of the coating on wear have also been researched by comparing it with Ni-4.5% P and electroplated chromium coatings.
Abstract: SUMMARYThe wear resistance of an electroless co-deposited Ni-8.73% P-SiC coating has been studied and the effects of microstructure and properties of the coating on wear have also been researched by comparing it with Ni-8.9% P, Ni-4.5% P-SiC and electroplated chromium coatings. It has been found that the high wear resistance of the Ni-8.73% P-SiC coating results from the SiC particle reducing the matrix grain size, increasing the coating hardness and resisting microcuts; and the Ni-P alloy matrix with high phosphorus content is hard and supports the SiC properly. The Ni-8.73% P-SiC coating is more wear resistance than the electroplated chromium coating as the latter surface is highly cracked and its high hardness will decrease quickly at high temperature.
7 citations