EFFECT OF THE CHEMICAL COMPOSITION OF ELECTRODE MATERIALS AND DEPOSITION CONDITIONS ON THE PROPERTIES F SPARK-DEPOSITED COATINGS. II. COATING HARDNESS AND WEAR RESISTANCE

摘要

Cermet coatings based on Ni-Al alloys and titanium-chromium diboride are electrospark-deposited onto 40Kh steel. It is analyzed how the metal-to-refractory phase ratio in the electrode material and the deposition conditions influence the mechanical and tribotechnical characteristics of the coatings. The wear resistance and friction coefficients of the electrospark-deposited coatings are shown to depend on the friction speed and loading. The cermet coatings show high tribotechnical characteristics (I = 7-5 fim/km, f = 0.2-0.25) at speeds to 12 m/sec and loads to 4 MPa in dry friction conditions. These characteristics can be controlled by varying electrode chemicalcomposition and deposition conditions.