Effect from the Composition of Electrodes Produced from TiC-(Fe-Cr-Al-Si) Alloys on the Formation, Phase Composition, and Properties of Wear- and Oxidation-Resistant Electrospark-Deposited Coatings on Steel

摘要

The structure, phase composition, and hardness of electrode materials produced by hot pressing of TiC-(Fe-9% Cr-1.5% Si-2% Al) alloys were examined. The binder amount in the alloys varied from 20 to 90 wt.%. The phase composition, hardness, and oxidation resistance of the electrosparkdeposited coatings made of the developed materials were studied at 900 degrees C with holding for 35 h, and their abrasive wear resistance was tested. It was determined how hot-pressing temperature of the electrode alloys and the spark discharge energy influenced the cathode (steel 45) weight increment in the electrospark deposition process employing an ELITRON-22A unit. The developed electrode materials were used to make a coating 120-160 m thick, with the total thickness of the strengthened layer and transition zone being 240-270 m, with 8.5-14.5 GPa microhardness (depending on the binder content of the alloys). The abrasive wear resistance and oxidation resistance of the electrospark-deposited coatings made of the developed alloys are two to three times higher than those of the coatings made of TiC hard alloys with Co-Cr, Co-Ni, and Ni-Mo binders.