A study on the wear resistance of electroless Ni–P/Diamond composite coatings
TL;DR: In this article, the effect of heat treatment, particle size and phosphorus content on the wear characteristics of composite electroless coating containing diamond particles was investigated and the results indicated substantial increase in wear resistance after the coated sample containing 9-10 wt% P content having fine diamond particle size is annealed around 350°C.
About: This article is published in Wear.The article was published on 2000-04-01. It has received 103 citations till now. The article focuses on the topics: Diamond & Electroless nickel.
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TL;DR: In this paper, the incorporation of ZnO in the plate has a great impact on the chemical composition and properties of the plate and the results of porosity test, hardness and thickness measurements, OCP measurements and polarization studies.
Abstract: The process of electroless nickel phosphorus (EN) plating has become an inevitable technology in various industrial fields due to its excellent corrosion and wear resistance characters. Incorporation of Zn in EN plate has great impact on the chemical composition and properties of the plate. This paper focuses on significant improvement of the plate by incorporation with ZnO as a composite in the EN plate. In the present study, ZnO was selected for the composite plating by virtue of its properties like semiconductivity (band gap of 3.37 eV), piezoelectric property and biocompatibility. ZnO incorporated plate was obtained using a standard EN bath dispersed with ZnO. The plate was evaluated based on the results of porosity test, hardness and thickness measurements, OCP measurements and polarization studies. The composite plate corresponding to 0.50 g/l of ZnO in the bath showed excellent mechanical as well as electrochemical characteristics. The effect of incorporation of ZnO and the influence of its concentration on the plating characteristics are briefly discussed in this paper.
27 citations
TL;DR: In this paper, the tribological behavior of electroless Ni-B coating in its asplated condition at elevated operating temperatures was investigated and the worn surface of the coatings was analyzed using optical microscopy and scanning electron microscopy.
Abstract: The present work investigates the tribological behavior of electroless Ni-B coating in its as-plated condition at elevated operating temperatures. Ni-B coating is deposited using an electroless method on AISI 1040 steel specimens. Coating characterization is done using scanning electron microscopy, energy-dispersive X-ray analysis, and X-ray diffraction techniques. Vicker's microhardness and surface roughness are measured. Friction and wear tests are carried out on a pin-on-disc tribological test setup at room and elevated temperatures of 100, 300, and 500°C. The tribological behavior deteriorates at 100°C compared to room temperature. Electroless Ni-B coating shows excellent wear resistance at 300°C, which again degrades at 500°C due to severe oxidation and softening of the deposits. The worn surface of the coatings is analyzed using optical microscopy and scanning electron microscopy. Within the temperature range considered, the wear mechanism changes from adhesion to a combination of adhesion a...
26 citations
TL;DR: In this article, a Ni-P-SiC composite coating was prepared by electroless plating in order to improve the corrosion capacity and wear resistance of AZ91D magnesium alloy, and the influence of pH values on deposition rates and properties of the coatings was studied.
26 citations
TL;DR: In this article, the effects of CNTs concentration in the bath on the microstructure of composite coatings, carbon nanotubes content, and hardness of composite coating before and after heat treatment at 400°C have been studied.
26 citations
TL;DR: Ni-B/diamond composite coatings were prepared using electrophoretic deposition and electroless deposition methods, leading to extremely high hardness which is comparable to hard coatings prepared by dry processes.
26 citations
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TL;DR: In this article, a discussion of several important aspects of evaluating wear resistance is presented, focusing on abrasion, which is a large area of the complex field of wear, and the merit of these several qualities should be checked by statistical mathematics to avoid erroneous conclusions and misplaced confidence.
54 citations
Journal Article•
TL;DR: In this article, the formation of the Ni 3 Si compound and wear mechanism of the composite coatings are discussed and structural analysis confirms that a new phase of Ni 3Si compound exists in the Ni-P-SiC deposits annealed at 650 °C for 1 hr.
Abstract: Electroless Ni-P-SiC composite coatings were investigated from the viewpoint of bath formulation, technology and coating properties. A sound and homogeneous deposit containing 25-30 vol. percent SiC can be produced, using an optimum bath formulation and technology. In comparison with Ni-P coatings, Ni-P-SiC composite coatings possess greater hardness and higher porosity, as well as lower adhesion and corrosion resistance. It is a significant advantage that the wear resistance of the composite coating is considerably increased. Heat treatment at high temperature can improve adhesion and wearability of the composite coating. Structural analysis confirms that a new phase of Ni 3 Si compound exists in the Ni-P-SiC deposits annealed at 650 °C for 1 hr. In this paper, formation of the Ni 3 Si compound and wear mechanism of the coatings are discussed.
24 citations
Journal Article•
TL;DR: In this paper, a mixture of microcrystalline nickel and amorphous phases was observed to be a mixture based on X-ray diffraction and transmission electron microscopy.
Abstract: Electroless Ni-P-B deposits with weight percentages of 0.72 P and 4.15 B; 1.87 P and 4.87 B, were observed to be a mixture of microcrystalline nickel and amorphous phases, based on X-ray diffraction and transmission electron microscopy. On annealing, Ni 3 P and Ni 3 B precipitated along with crystalline nickel in one step. The microhardness of the deposits showed typical precipitation hardening behavior, with hardness increasing from about 550 VHN in the as-deposited condition, to about 1000 VHN in the fully crystallized condition
6 citations