Formation of protective coatings on steel Kh12MF by the force of the sequential electric spark treatment by boride and carbon-containing electrodes

• Published in: Russian journal of non-ferrous metals Vol. 55; no. 2; pp. 205 - 211
• Main Authors: Zamulaeva, E. I., Levashov, E. A., Pogozhev, Yu. S., Sviridova, T. A., Petrzhik, M. I., Kudryashov, A. E.
• Format: Journal Article
• Language: English
• Published: Heidelberg Allerton Press 01.03.2014; Springer Nature B.V
• Subjects: Borides; Chemistry and Materials Science; Coatings; Durability; Electrodes; Intermetallic compounds; Intermetallics; Materials Science; Metallic Materials; Nanostructured Materials and Functional Coatings; Nickel aluminides; Oxidation; Tribology; silicicated composite material; titanium boride; fine-grain dense graphite; coating; electric-spark treatment
• ISSN: 1067-8212; 1934-970X
• DOI: 10.3103/S1067821214020217

Coatings on steel Kh12MF are fabricated by the force of electric-spark treatment by the TiB 2 -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 TiB 2 -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.