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Preparation and structural characterization of nickel/ alumina nano-particles composite coatings

C. GHEORGHIES1,* , G. CARAC1, I. V. STASI1

Affiliation

  1. Faculty of Sciences“Dunarea de Jos” University of Galati, Galati R-6200, Romania

Abstract

The addition of alumina nano-particles into nickel plating bath leads to significantly changes for the surface morphology and for the preferred crystallographic orientation of the composite coatings deposited on Inconel substrates. The typical morphology for nickel deposits from an additive-free bath is pyramidal; however the addition of alumina particles in concentrations between 5 g/l and 10 g/l changes this morphology to hemispherical. The preferred growth direction was also influenced by alumina nano-particles. Therefore, the preferred growth process of the nickel matrix in crystallographic directions <111>, <200> and <220> is strongly influenced at a concentration of 5 g/l, while at a concentration of 10 g/l the influence is very small. When alumina nano-particles were absent from the electroplating bath the growth took place preferentially on (200) oriented planes. However, alumina in small amount acts towards improving the growth of grains of this orientation. Nano-particles of alumina influence the level of the first order tensions determined by the X-ray diffraction technique by means of the 2 sin ψ method. The concentration of 10 g/l leads to a bigger level of the first order tension in the matrix of nickel of electrodeposited composite, as compared to the concentration of 5 g/l..

Keywords

Co-deposition, Nickel, Nano- alumina particles, Composites, Structure.

Submitted at: Feb. 20, 2006
Accepted at: May 18, 2006

Citation

C. GHEORGHIES, G. CARAC, I. V. STASI, Preparation and structural characterization of nickel/ alumina nano-particles composite coatings, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1234-1237 (2006)