SURFACE PLASTIC DEFORMATION OF ELECTRO-SPARK COATINGS

The research provides facts about the surface plastic deformation (SPD) effect on the coatings surface parameters formed by electro-spark alloying (ESA). The complex for nonabrasive ultrasonic finishing (NUF) was used as the installation for SPD. It was found out that when processing bronze by NUF several passes of indenter were needed to provide substantial decrease of the surface roughness parameters. The NUF effect on roughness parameters of intermetallic coatings on steel 20X13 was studied. NUF proved to be perspective when it is necessary to reduce the number of transverse cracks in the coatings formed by ESD method. In order to assess the efficiency of coating surface treatment by NUF method the use of additional parameters Rk, Rpk, Rvk alongside with Ra are recommended as they allow assessing the resulting surface as triple. It is found out that the number of passes during the processing of intermetallic coatings should not exceed 6. For achieving maximum processing efficiency it is necessary to take into consideration the initial roughness value

NICKEL ALUMINIDE SYNTHESIS REINFORCED WITH MOLYBDENUM BORIDE COMPOSITE

The authors study obtaining a composite material NiAl - Mo2B5 while carrying out thermally coupled reactions of self-propagating high-temperature synthesis with a deoxidizing aluminothermal stage. The authors established ultimate and phase composition of the obtained composite. The microstructure is studied. It is shown that the composite consists of the intermetallic phase NiAl with Mo2B5 inclusions