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, fine diamond powder and nickel ions are used as metal-matrix composites to improve wear-resistance in the development of micro-hole structures, and the reinforced microstructure is produced on a specular substrate through a precision extrusion wax and electrochemical co-deposition technique.
6 citations
TL;DR: In this article, the influence of a redox active surfactant (4-Ethylazobenzene-4'-(oxyethyl)trimethylammonium bromide, AZTAB) on the codeposition of diamond particles with nickel has been investigated.
Abstract: The influence of a redox active surfactant (4-Ethylazobenzene-4’-(oxyethyl)trimethylammonium bromide, AZTAB) and a redox inactive surfactant (n-Dodecyltrimethylammonium bromide, DTAB) on the codeposition of diamond particles with nickel has been investigated. A nickel bath containing DTAB did not deposit a higher amount of diamond particles with nickel, whereas the nickel bath containing AZTAB deposited more than twice the amount of the particles (45.5 vol.%) that were deposited by the former bath (21.6 vol.%). An electrochemical investigation showed that AZTAB is reduced during the nickel deposition. Therefore, it has been assumed here that the reduction of free AZTAB at the cathode surface leads to desorption of AZTAB adsorbed on the particles in the vicinity of the cathode. As a result, deposition of these particles at the cathode surface takes place before these particles are being entrapped in the layer of growing nickel.The wear resistance of the Ni/diamond composite coatings containing various volumetric content of particles was also investigated. This showed that a higher degree of wear resistance accompanied increased particle content.
6 citations
TL;DR: In this paper, a Ni-conductive-diamond composite electrode dip coating with polyvinylidene fluoride (PVDF) was used to reveal the conductive diamond by polishing the PVDF coated on the surface.
6 citations
TL;DR: In this article, nano-sized nickel-phosphor powders with an average particles size of 100nm were elaborated by polyol method and consolidated by spark plasma sintering (SPS) with sinterings temperatures between 600 and 650°C.
5 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