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 article, electroless Ni-B alloy and Ni-b-CeO2 nanocomposite coatings were formed on 356 aluminium alloy surfaces using ceria incorporation to reduce the average nodular grain size from 1150nm to 650nm and Ni crystallite size from 15nm to 997nm.
Abstract: Nickel-based coatings on aluminium with specific surface properties are of great interest for anti-corrosive, anti-wearing, and self-lubricating applications In the present study electroless Ni-B alloy and Ni-B-CeO2 nanocomposite coatings were formed on 356 aluminium alloy surfaces Ceria incorporation to Ni-B coating reduces the average nodular grain size from 1150 nm to 650 nm and Ni crystallite size from 15 nm to 997 nm Ni-B-CeO2 nanocomposite shows remarkable improvement in microhardness of 684 VHN compared to pure Ni-B coating with 424 VHN Enhanced wear resistance and reduction in friction coefficient are observed for the nanocomposite coatings compared to 356 Al alloy and Ni-B alloy coating Potentiodynamic polarization measurements show a remarkable reduction in the corrosion current density for ceria added nanocomposite coating (248 × 10−6 A cm−2) than that of the particle-free counterpart (1118 × 10−6 A cm−2) Uniform Ni-B-CeO2 composite coating was obtained on centrifugally cast A356 aluminium alloy cylinder liners which have potential applications in automotive systems
42 citations
TL;DR: In this article, the effects of operating conditions of electroformed Ni-P coatings on the phosphorous contents and micro-hardness of the deposits were investigated by X-ray diffraction.
42 citations
TL;DR: In this paper, the effect of heat treatment on the wear characteristics of composite diamond coatings was studied and the results indicated substantial increase in wear resistance after heat treatment, in order to overcome the difficulties in the most common ‘weight loss’ method, X-ray diffraction method is used.
39 citations
TL;DR: In this paper, a combination of selective laser melting (SLM) and spark plasma sintering (SPS) is used to 3D print functionally graded lattices (FGL) that are later filled with metal-diamond composites.
Abstract: In this paper, a new route is introduced to fabricate parts with increased wear and impact resistance for use in tunneling and mining applications. A combination of selective laser melting (SLM) and spark plasma sintering (SPS) to 3D print functionally graded lattices (FGL) that are later filled with metal-diamond composites was used. It was demonstrated that a cellular lattice plays an important role in the consolidation of diamond particles. Impact-abrasive laboratory experiments with tribological device, developed in-house, were carried out to characterize the fabricated samples. The results show that the balance of nickel, molybdenum, and chromium significantly affects the performance of the fabricated specimens. The addition of a higher content of Mo Cr, Ni and coated diamond particles guarantees higher impact-abrasive resistance of the composite. Our experimental results show that the FGL structure allows a more accurate distribution of diamond particles (variable metal/refractory material content) across the structure and our finite element simulations showed increased ductility and impact absorption ability due to a more uniform distribution of stresses throughout the volume.
36 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