Abstract
Ni-Co-Si3N4 nanocomposite coatings were prepared by electrodeposition technique. The deposition was performed at 50 mA cm-2 on copper substrate. The working temperature of electrodepostion was constant at 500C in an acidic environment of pH 4. The effects of silicon in the nickel-cobalt metal matrix composite were investigated. Energy dispersive X-ray spectroscopy was used to determine the composition. The Co content in the coatings is in the range 27-49 at.%. The phase present in the Ni-Co-Si3N4 were examined with an X-ray diffraction analysis. All the reflection patterns indicate that the coatings are having face-centered cubic (fcc) structure. The microhardness of the Ni-Co-Si3N4 nanocomposite coating increases with increasing silicon content. The microhardness of the Ni-Co-Si3N4 nanocomposite coating increased from 549 HV for Nickel-cobalt alloy coating to 641 HV for Ni-Co-Si3N4 nanocomposite coating with 5.47 at.% Si.
Highlights
Composite materials can be defined as coatings consisting of second phase particles dispersed throughout of metal matrix
The amount of silicon nitride particles in the solution has significant effect on atom percentage of the particles incorporated into the Ni-Co matrix
Increasing silicon nitride in the solution creates higher particles density and produces more opportunities for particles adsorption on the electrode [11,12]
Summary
Composite materials can be defined as coatings consisting of second phase particles dispersed throughout of metal matrix. The presence of the second phase particles in a co-deposited film offers a variety of benefits on physical and mechanical properties as compared to the pure metal or alloy coatings. Silicon nitride (Si3N4) is a very hard ceramic material, Si3N4 nanoparticulates as fillers contribute to the improvement of the hardness of the coating [9]. Not much information is available in the literature on the methods to enhance the extent of incorporation, structure and properties of Nickel-cobalt alloy. There are only a few reports on the methods to enhance the extent of incorporation, structure and properties of Si3N4 nanoparticulates in electrodeposited nickel-cobalt composites. Silicon nitride is chosen as the dispersed ceramic reinforcement in the nickel-cobalt coating. The effects of silicon nitride incorporation on the properties Ni-Co nanocompisite were investigated
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