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The features surface morphology are considered for plasma-sprayed coatings used with various counterbodies under conditions of boundary friction. The tribotechnical characteristics of the coatings are examined in relation to the structure. There is found to be a substantial effect from the porosity on the formation of the secondary structures, the changes in topography, and the changes in elemental composition of the friction surface.

Results of studying microstructural changes in eutectic alloys with different types of spraying are summarized. A distinctive feature of alloys which have eutectic carbides of the type MeC is that they do not change their shape and composition during different methods of spraying. The morphological characteristics of oxides phases are demonstrated. Addition of alloying elements with an affinity for oxygen makes it possible to alter the morphological characteristics.

The effect of alloying with aluminum and cerium on morphological features and production characteristics of eutectic alloys based on iron is studied. An aluminum content from 0.5 to 3.0% modifies particle shape from compact and rounded to particles with a very developed surface. A reduction in the segregation point of impurity elements, primarily sulfur and phosphorus, is observed on adding 0.05–0.16% of cerium. Cerium also promotes formation of spherical particles which provides good production characteristics.