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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Book•
01 Jan 1990
TL;DR: The Electroless Plating: Fundamentals and Applications (ESPA) as discussed by the authors is a comprehensive text that covers both fundamental and applied aspects of electroless deposition, and was first introduced at SUR/FIN '91.
Abstract: Many texts have been written on surface finishing over the years that deal with electroless deposition as a sidelight. Through the talents and efforts of Glenn Mallory and Juan Hajdu, a comprehensive text, entitled Electroless Plating: Fundamentals and Applications, is available through AESF Headquarters. The editors have combined the efforts of 27 contributing authors to produce a wide-ranging text that covers both fundamental and applied aspects of the subject. Published by the AESF, the book was first introduced at SUR/FIN ‘91—Toronto.
963 citations
TL;DR: In this article, an analysis of the Ni deposit produced by the catalytic Ni reduction process was made and X-ray and electron diffraction revealed that Ni deposit was an amorphous solid.
Abstract: An analysis was made of the structure of the Ni deposit produced by the catalytic Ni reduction process. X‐ray and electron diffraction revealed that the Ni deposit was an amorphous solid. The structure appeared to be unrelated to and independent of the nature of the substrate and thickness of the deposit.Metallographic examination revealed a dense material, free of voids, and perfect conformity to the substrate surface profile. Etching produced a lamellar structure, the variation in etching intensity being interpreted as variations in dissolved P. In platings, the lamellae lay parallel to the plane of the substrate. Growth faults were observed traversing the thickness dimension from substrate surface irregularities. The amorphous structure reverted to a crystalline phase mixture of Ni and at low temperatures with a large heat evolution.
131 citations
TL;DR: In this paper, the structural changes induced by heating were studied in electroless nickel-phosphorus alloy coatings at three phosphorus compositions: 1%−3, 6.5%−8% and 10.5%-11% (by weight).
88 citations
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...
65 citations
Journal Article•
TL;DR: Proprietes tubologiques et de resistance a la corrosion des revetements composites composites nickel/PTFE as mentioned in this paper have shown that they can resist corrosion.
Abstract: Proprietes tubologiques et de resistance a la corrosion des revetements composites nickel/PTFE
32 citations