Composite layers with nickel matrix and nano-sized Si₃N₄ disperse phase have been the subject of the authors’ investigations. The composite layers used in this study have been produced by two kinds of deposition techniques, i. e., by the chemical reduction and the electrochemical method. A disperse powder of the silicon nitride with grain dimensions in order of 15 nm has been used for the depositions of the composite coatings.
Results of the morphology and diffraction analyses of the silicon nitride powder and its contents in the materials of the composite coatings are reported. The chemical compositions and the surface topography of the nano-crystalline composite layers as well as the structure of the produced composite Ni-Si₃N₄ and Ni-P-Si₃N₄ coatings have been studied. The microstructures of the coatings were examined by scanning electron microscope (SEM) equipped with EDS suitable for local chemical analysis. Moreover, studies of the used ceramic phase and the composite coatings have been performed with XRD and TEM techniques. The comparative analysis of the obtained results showed that the type of the methods applied for producing of the composed coatings has an important influence on the contents and distributions of the nano-disperse phase within the surface composite layers.

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