The structure of composite deposition with nickel matrix

The composite coatings can be deposited by certain techniques, on different metallic or non-metallic materials, as new perspectives are opened toward obtaining the protective coatings with superior properties on classic, usual materials. The composite coatings are a particular case of the composite materials. The structure and composition of the coatings, as well as their bond with the support material greatly influences its properties. The paper presents the structure of some composite coatings with the nickel matrix obtained through electrochemical methods, using as a complementary phase carbides and oxyde particles (Al2O3, ZrO2, B4C, SiC) with contents of cca. 4-6%. The maintaining times in electrolite ranged from 10 to 60 minutes. The macro and microstructrutal analysis had as objectives. the exterior aspect at composite depositions; the adherence of the film deposited at the support; the width of the deposition; the film compactity; the size, shape and orientation of the grains in the deposited layer, the distribution of the disperse phase in the metallic matrix.