Synthesis and characterization of nickel/barium hexa-aluminate composite coatings

Kumar, Dinesh and Gurav, Sampada and Jayaram, Vikram and Biswas, Sanjay Kumar (2012) Synthesis and characterization of nickel/barium hexa-aluminate composite coatings. In: BULLETIN OF MATERIALS SCIENCE, 35 (6). pp. 977-988.

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Abstract

Electrodeposition of nickel/barium hexa-aluminate (Ni/BHA) composite coatings has been carried out from a Watt's bath on mild steel substrate. BHA powders with plate habit were synthesized by solution combustion synthesis followed by heat treatment to ensure complete conversion to the hexa-aluminate phase. Heat treated material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) combined with X-ray analysis. The dispersion behaviour and stability of BHA suspensions with cationic and anionic surfactants at room temperature were studied by dynamic light scattering under different pH. The influence of BHA concentration in the electrolytic bath, deposition temperature, pH, current density and duty cycle on particle incorporation in the coatings were studied and conditions for maximum particle incorporation were established. Coatings with a roughness of about 0 center dot 4 mu m were produced by using this technique. Effect of BHA content on microhardness was also investigated. A reasonably good thickness of the coatings was achieved in a given set of conditions.

Item Type:	Journal Article
Publication:	BULLETIN OF MATERIALS SCIENCE
Publisher:	INDIAN ACAD SCIENCES
Additional Information:	Copy right for this article belongs to INDIAN ACAD SCIENCES, BANGALORE INDIA
Keywords:	Volume fraction;composite coatings;microstructure;scanning electron microscope;X-ray diffraction
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Feb 2013 10:59
Last Modified:	04 Feb 2013 10:59
URI:	http://eprints.iisc.ac.in/id/eprint/45739

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