Abstract
Coatings on steel Kh12MF are fabricated by the force of electric-spark treatment by the TiB2-20% NiAl electrode and carbon-containing materials. Kinetics of their formation, the phase composition, mechanical and tribological properties, roughness, and durability to high-temperature oxidation are investigated. When depositing the coating using the TiB2-20% NiAl electrode, the effect of a disproportionate increase in the substrate erosion, which is observed with an increase in the energy of a single pulse and leads to lowering the content of boride phases in the coating is discovered. The subsequent electric-spark treatment of the boride coating using an electrode made of fine-grain dense graphite led to a noticeable improvement of tribological properties of the coating having no noticeable effect on its durability to high-temperature oxidation. In the case of applying an electrode made of the silicicated composition material, the coating durability to high-temperature oxidation increased substantially, but no improvement of tribological properties was observed.
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