Electric exploding of a tungsten carbide – cobalt material near-by high-speed steel surface forms on it ahardening coating. The essential structure properties of the formed coatings are determined byspecifications of contact exploding electrode and the pulse current amplitude and duration. Theinvestigations of coating structures were done by optical and electronic metallography. They have shownthat the contact electric exploding caused the transfer of tungsten carbide and cobalt on the surface ofhigh-speed steel. The breakdown of tungsten carbide – cobalt material took place during electricalexploding. The hardening layers of tungsten carbide and pure nanocrystalline tungsten have been formedupon the surface of high-speed steel as a result of electric exploding. Crystalline grains of tungsten havean almost spherical form and their characteristic size less than 400 nanometers. Micro hardness of thecoating layers and high-speed steel structures was measured.
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