scholarly journals Quantitative Analysis of Electroplated Nickel Coating on Hard Metal

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Hassan A. Wahab ◽  
M. Y. Noordin ◽  
S. Izman ◽  
Denni Kurniawan
Keyword(s):  
Coating Thickness ◽  
Nickel Coating ◽  
Hard Metal ◽  
Metal Substrate ◽  
Empirical Models ◽  
Electrode Gap ◽  
High Quality ◽  
Diamond Deposition ◽  
Nickel Deposition ◽  
Electroplating Process

Electroplated nickel coating on cemented carbide is a potential pretreatment technique for providing an interlayer prior to diamond deposition on the hard metal substrate. The electroplated nickel coating is expected to be of high quality, for example, indicated by having adequate thickness and uniformity. Electroplating parameters should be set accordingly for this purpose. In this study, the gap distances between the electrodes and duration of electroplating process are the investigated variables. Their effect on the coating thickness and uniformity was analyzed and quantified using design of experiment. The nickel deposition was carried out by electroplating in a standard Watt’s solution keeping other plating parameters (current: 0.1 Amp, electric potential: 1.0 V, and pH: 3.5) constant. The gap distance between anode and cathode varied at 5, 10, and 15 mm, while the plating time was 10, 20, and 30 minutes. Coating thickness was found to be proportional to the plating time and inversely proportional to the electrode gap distance, while the uniformity tends to improve at a large electrode gap. Empirical models of both coating thickness and uniformity were developed within the ranges of the gap distance and plating time settings, and an optimized solution was determined using these models.

Characteristics of Electroplated Nickel Layer on Tungsten Carbide

2013 ◽  
Vol 315 ◽  
pp. 73-77 ◽  
Author(s):  
Hassan A. Wahab ◽  
M.Y. Noordin ◽  
Mohammad Sakhawat Hussain ◽  
S. Izman
Keyword(s):  
Tungsten Carbide ◽  
Nickel Coating ◽  
Substrate Surface ◽  
Cutting Tools ◽  
Hard Metal ◽  
Separation Distance ◽  
Nickel Layer ◽  
Nickel Deposition ◽  
Hardness Tester ◽  
Materials Used

Diamond coating on tungsten carbide (WC-Co) cutting tools with cobalt binder experiences delaminating failure due to the deleterious effect of cobalt. One of the methods used to reduce this effect is by coating an interlayer onto the substrate surface prior to diamond deposition. Different materials have been used as an interlayer which is normally deposited to the substrate surface using CVD and PVD techniques. Among different materials used as interlayer on WC-Co, nickel is considered as an attractive candidate due its good chemical and physical properties. In this study the potential of the electroplating technique for deposition of nickel interlayer on WC-Co will be investigated. Nickel deposition on WC-6%Co substrate was carried out by electroplating in a standard watts solution at constant plating parameters (Current: 0.1 Amp, electric potential: 1.0 V and pH: 3.5). The gap between anode and cathode was varied (5mm, 10mm and 15mm). The nickel coating formed on the hard metal surface was characterized in terms of the coating thickness, layer uniformity and coating hardness by using SEM and the micro hardness tester. Based on the results, desirable nickel coating properties were obtained when the separation distance between anode and cathode was 15mm.

Influences of WC-Co hard metal substrate pre-treatments with boron and silicon on low pressure diamond deposition

1994 ◽  
Vol 3 (11-12) ◽  
pp. 1360-1369 ◽  
Author(s):  
S. Kubelka ◽  
R. Haubner ◽  
B. Lux ◽  
R. Steiner ◽  
G. Stingeder ◽  
...  
Keyword(s):  
Low Pressure ◽  
Hard Metal ◽  
Metal Substrate ◽  
Diamond Deposition

Coating Nano-TiO2 on Optical Fiber with Al(H2PO4)3 Adhesive

2007 ◽  
Vol 280-283 ◽  
pp. 485-488 ◽  
Author(s):  
Yu Hong Zhao ◽  
Jia Chen Liu ◽  
Shun Li ◽  
Yi Rong Liu
Keyword(s):  
Optical Fiber ◽  
Process Parameters ◽  
Coating Thickness ◽  
Fiber Surface ◽  
Tio2 Coating ◽  
Experimental Results ◽  
Coating Process ◽  
High Quality ◽  
Tio2 Photocatalysis

To meet the need of optical fiber photoreactor designed by mechanism of TiO2 photocatalysis, nanometer TiO2 was coated on the surface of optical fiber by dipping nude fibers into an Al(H2PO4)3-contained TiO2 slurry. Effects of slurry conditions, including content of TiO2 and addition of Al(H2PO4)3 adhesive, on coating thickness and quality were determined. Coating process, especially the effect of coating times, was also concerned. Based on the experimental results, fitting slurry conditions and process parameters were suggested for obtaining high-quality TiO2 coating on optical fiber surface.

Pulsed Laser Treatment of WC, Co Tool Substrates to Improve Co Removing and Diamond Nucleation

1998 ◽  
Vol 526 ◽  
Author(s):  
E. Cappelli ◽  
S. Orlando ◽  
F. Pinzari ◽  
P. Ascarelli
Keyword(s):  
Laser Treatment ◽  
Coming Out ◽  
Surface Segregation ◽  
Soot Formation ◽  
Bulk Material ◽  
Pulsed Laser ◽  
Hard Metal ◽  
Binder Phase ◽  
Diamond Deposition ◽  
Diamond Nucleation

AbstractDiamond coated cutting tools seem to be one of the most promising system to machine non ferrous, very hard materials, like metal matrix composites (MMC), carbon fibers, hypereutectic Al/Si alloys. The widespread used and cheaper bulk material for tool inserts, the WC,Co hard metal, is convenient and profitable as a substrate for diamond film coatings. Unfortunately, the Co-rich binder phase constitutes a severe obstacle for diamond deposition. Because of the catalytic effect for amorphous carbon or soot formation, the presence of Co actually results in a detrimental effect both on diamond nucleation and adhesion to substrate. Several chemical and physical methods have been developed to etch Co from the surface, no conclusive and perfectly reliable procedure, however, has been achieved, as far as a strong adhesion is concerned.In our experiments, we used ArF (λ = 193 nm, hv ≅ 6.4 eV) and Nd:YAG (λ= 532 nm, hv ≅ 2.3 eV) pulsed laser treatment to selectively remove Co from the surface and to seal the structural voids, coming out after Co chemical etching from the substrate, and responsible of surface segregation of Co from the bulk, during CVD diamond deposition. The sealing efficiency, after a thermal treament (3h, 800°C) in an inert atmosphere, resulted to be quite good, compared to the untrated surface. The morphological and chemical effects have been studied by SEM/EDAX microscopy.

Applying Thermal Coatings to Narrow Walls of the Continuous-Casting Molds

2016 ◽  
Vol 870 ◽  
pp. 564-567 ◽  
Author(s):  
S.M. Gorbatyuk ◽  
A.A. Gerasimova ◽  
N.N. Belkina
Keyword(s):  
Phase Composition ◽  
Service Life ◽  
Continuous Casting ◽  
Nickel Coating ◽  
Wall Surface ◽  
High Quality ◽  
Working Surface ◽  
Structure Phase ◽  
Resistant Layer ◽  
Thermal Coating

Studies on enhancing the service life of continuous casting moulds at their narrow walls of copper M1 before the last repair by means of a heat spraying wear-resistant layer of the chrome-nickel coating have been carried out. Preliminary, the coating`s structure, phase composition, skin hardness and microhardness of chromium-nickel coating were studied. It is established that to obtain the required cleanliness level of the wall surface by making use of their mechanical operation, it is necessary to conduct thickness of the chromium-nickel coating operations. 0.5 – 0.6 mm chrome-nickel thermal coating was applied to the surface of the wall of a thick-walled narrow pair crystallizer. The results indicate the high-quality coating acceptable for application to the working surface of narrow walls of thick-walled moulds.

scholarly journals Intercalation and its mechanism of high quality large area graphene on metal substrate

2017 ◽  
Vol 66 (21) ◽  
pp. 216803
Author(s):  
Guo Hui ◽  
Lu Hong-Liang ◽  
Huang Li ◽  
Wang Xue-Yan ◽  
Lin Xiao ◽  
...  
Keyword(s):  
Metal Substrate ◽  
Large Area ◽  
High Quality

Influence of Various Pulse Waveforms during Fabrication of Micro Rectangular Pattern by Masked Tool using Electrochemical Micromachining

2021 ◽  
pp. 1-24
Author(s):  
S. Kunar ◽  
B. Bhattacharyya
Keyword(s):  
Power Supply ◽  
Electrochemical Micromachining ◽  
Duty Ratio ◽  
Machining Performance ◽  
Electrode Gap ◽  
High Quality ◽  
Dc Power ◽  
Pulsed Dc ◽  
Rectangular Pattern ◽  
Dc Power Supply

Maskless electrochemical micromachining (EMM) is an alternative method to fabricate microsurface textures on conductive substances, but it is still very challenging issue to create microsurface textures by this method. This paper proposes a new issue that maskless EMM process generates micro rectangular patterns using various pulse waveforms i.e. triangular, sine and square of pulsed DC power supply at constant voltage mode on stainless steel (SS-304) workpiece. A novel concept of maskless EMM setup consisting of EMM cell, electrode holding devices, electrical connections and vertical cross flow electrolyte system is introduced for the generation of high-quality micro rectangular patterns using various pulse waveforms. Another important finding is that SU-8 2150 negative photoresist can fabricate more than 28 micro rectangular patterned samples with higher dimensional accuracy and surface quality. The influence of machining voltage, inter electrode gap, pulse frequency, duty ratio and flow rate is investigated on machining performance such as length overcut, width overcut, machining depth and surface roughness ([Formula: see text] of micro rectangular pattern using three pulse waveforms. One mathematical model is developed to show the effectiveness of three pulse waveforms by the estimation of current efficiencies. From the experimental investigation, it is observed that higher frequency with square waveform at constant duty ratio is suitable to generate high-quality micro rectangular patterns under pulsed DC power supply.

Wear behavior of electrodeposited nickel coating on ZP5 zinc alloy

2020 ◽  
Vol 234 (10) ◽  
pp. 1291-1302
Author(s):  
Dario Croccolo ◽  
Massimiliano De Agostinis ◽  
Stefano Fini ◽  
Giorgio Olmi ◽  
Robusto Francesco ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Applied Load ◽  
Nickel Coating ◽  
Wear Behavior ◽  
Zinc Alloy ◽  
Corrosive Environment ◽  
Statistical Tool ◽  
Aisi 304 ◽  
Electrodeposited Nickel ◽  
Sliding Distance

Nickel coating on zinc alloy is quite promising for the achievement of an additional wear improvement in corrosive environment. To investigate this point, block-on-ring tests were carried out. Blocks measuring 5 × 5×20 mm3 were obtained from real locking components, made of ZP5 EN 12844 and coated by Zn/Cu1Ni5s ISO 1458. As counter material, an AISI 304 with a 40 mm diameter cylindrical geometry was used. Three load levels (5, 10 and 15 N) and three coating thickness levels (low: 5 to 10 µm; medium: 10 to 15 µm; high: 15 to 20 µm) were considered. The sliding distance was initially set to 500 m. Then, since the coating was worn out very quickly during the test, the sliding distance was set to 150 m. The results, in terms of volume loss due to wear, were processed using the statistical tool of two-way ANOVA and Fisher test. It was assessed that the wear rate is strongly affected by the applied load. The coating thickness does not significantly affect the wear.

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