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 Ni-P-D composite plating was used to fabricate a micro diamond wheel with a diameter of φ450μm, and the topography of the micro wheel showed that diamond grains as the reinforced phase are embedded omnidirectionally and uniformly in the NiP plating along both the surface direction and the thickness direction.
8 citations
TL;DR: In this article, a wheel-tool array is fabricated and then the developed tool is used in fast on-line grinding of multiple microgroove on a microscope slide to allow for microscopic examination of urine sediment cells.
Abstract: This study presents a novel, economical and efficient fabrication technique for precisely generating multiple microgrooves on a microscope slide to allow for microscopic examination of urine sediment cells. This study incorporates two important phases: a precision wheel-tool array is fabricated and then the developed tool is used in fast on-line grinding of multiple microgrooves. The wheel-tool blank is made of diamond grit of 0–2 µm grade via co-deposition. Subsequently, it is trued, sliced and sharpened by means of micro wire electro discharge dressing. The finished wheel-tool is utilized on-line to grind multiple microgrooves using 'high-speed and fast-shallow grinding'. A ductile grinding regime is established to obtain a nano-metric surface finish for the multiple microgrooves generated on the microscope slide. The depth and width of the grooves in the array are both 10 µm and a surface finish of Ra equal to 0.010 µm is simultaneously achieved. This multiple microgrooving technique can supply high-quality fast grinding in the fabrication of bio-medical devices, such as those used for stationing and counting urine sediment cells.
6 citations
TL;DR: In this article, the effect of annealing treatment conditions on the microstructure and microhardness and abrasive wear performance of the diamond/NiCrAl composite powder is investigated.
Abstract: Diamond/NiCrAl composite powder with a diamond content of 40vol.% is prepared by mechanical alloying process with diamond powder and NiCrAl alloy powder. Cold spraying is employed to deposit diamond/NiCrAl composite coating. To enhance the bonding between diamond particles and NiCrAl matrix, annealing treatment is applied to the as-sprayed coating. The effect of annealing treatment conditions on the microstructure and microhardness and abrasive wear performance of the coating is investigated. The results show the microstructure of the composite powder is completely retained in the coating owing to the low temperature of spray powder during cold spray process. The interface between diamond and NiCrAl matrix is enhanced by the CrxCy layers formed during annealing treatment. Moreover, the cohesion of deposited particles in the coating is improved through metal element diffusion during heat treatment. The hardness and wear performance of the coating is related to coating microstructure and the bonding at the interfaces between diamond particles and NiCrAl matrix.
6 citations
TL;DR: In this article, the effect of Ni-P/diamond/graphene composite coating on the structure and surface hardness of 2024-T6 aluminum alloy as well as their effect on the corrosion and wear resistance of the alloy in 3.5 % NaCl solution.
Abstract: The purpose of the present study is to evaluate the effect of the electroless Ni-P/diamond/graphene composite coating on the structure and surface hardness of 2024-T6 aluminum alloy as well as their effect on the corrosion and wear resistance of the alloy in 3.5 % NaCl solution. The electroless Ni-P plating solution was prepared by adding different size diamond (6-12 μm and 0.2 μm) and nanographene into the electroless Ni-P plating solution to obtain Ni-P/diamond, Ni-P/graphene and Ni-P/daimond/graphene composite coatings for comparison. Experimental results indicated that the Ni-P/diamond, Ni-P/graphene and Ni-P/daimond/graphene composite coatings can be successfully electroless deposited on anodized 2024-T6 aluminum alloy. The anodically oxidized films, that formed on the aluminum alloy using phosphoric acid as the electrolyte, was porous with high density of pores, and thus could enhance the adhesion of the composite coatings. The Ni-P/daimond/graphene hybrid coating had a higher hardness as well as better corrosion and wear resistance of 2024-T6 alloy in 3.5 wt.% NaCl solution as compared with other composite coatings. When the combination of nanographene and smaller diamond particles added this beneficial effect was significantly raised, especially the composite coating was further vacuum annealed at 400 °C for 24 h to obtain a more smooth and defect-free coating structure.
6 citations
20 Jul 2012
TL;DR: An overview of the deposition methodologies involved in preparing ED and EL composite coatings, the mechanism of codeposition of particles, challenges and issues on particle incorporation in the metal matrix, particularly on the dispersibility of particles and the interaction between particle and metal matrix during deposition is presented in this article.
Abstract: The idea of codepositing various second phase particles in electrodeposited (ED) or electroless deposited (EL) metal or alloy matrix and thereby taking advantage of their desirable qualities such as hardness, wear and abrasion resistance, corrosion resistance, etc., has led to the development of ED and EL composite coatings with a wide range of possible combinations and properties. This chapter presents an overview of the deposition methodologies involved in preparing ED and EL composite coatings, the mechanism of codeposition of particles, challenges and issues on particle incorporation in the metal matrix, particularly on the dispersibility of particles and the interaction between particle and metal matrix during deposition. In addition, the influence of particle incorporation on the nucleation, plating rate, adhesion, surface appearance, roughness, microstructure, texture, hardness, tribological characteristics and corrosion resistance of composite coatings and some of the key applications of composite coatings are addressed.
6 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