Influence of SiC, Si3N4 and Al2O3 particles on the structure and properties of electrodeposited Ni |
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Authors: | Meenu Srivastava VK William Grips |
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Affiliation: | Surface Engineering Division, National Aerospace Laboratories, Post Bag No. 1779, Bangalore-560 017, India |
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Abstract: | The structure and properties of electrodeposited nickel composites reinforced with inert particles like SiC, Si3N4 and Al2O3 were compared. A comparison was made with respect to structure, morphology, microhardness and tribological behaviour. The coatings were characterized with optical microscopy, Scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD) technique. The cross-sectional microscopy studies revealed that the particles were uniformly distributed in all the composites. However, a difference in the surface morphology was revealed from SEM studies. The microhardness studies revealed that Si3N4 reinforced composite showed higher hardness compared to SiC and Al2O3 composite. This was attributed to the reduced crystallite size of Ni — 12 nm compared to 16 nm (SiC) and 23 nm (Al2O3) in the composite coating. The tribological performance of these coatings studied using a Pin-on-disk wear tester, revealed that Si3N4 reinforced composite exhibited better wear resistance compared to SiC and Al2O3 composites. However, no significant variation in the coefficient of friction was observed for all the three composites. |
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Keywords: | Coatings Composites Hardness Microstructure Wear |
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