Globular structure of electrospark-deposited VK8 alloy coatings

I.Podchernyaeva,
 
O.V.Stepanova,
 
A.Panasyuk,
 
I.Uvarova,
 
D.I.Ywechko
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2008, #05/06
http://www.materials.kiev.ua/article/736

Abstract

The paper examines the composition and structure of electrospark coatings based on AlN-TiB2 (TBSAN) and AIN-ZrB2 (TsBSAN) electrode materials deposited on VK8 alloy. Kinetic dependences of mass transfer are studied. In spite of the close structures and mechanical properties of TBSAN and TsBSAN electrode materials, the coatings substantially differ in structure and properties. The kinetic dependences of mass transfer, which differ forTsBSAN and TBSAN electrodes, generally confirm that the mass transfer in electrosparkalloying of a hard-alloy substrate occurs in three stages and show distinctions in the electroerosion mechanism for these electrode materials.


COMPOSITE CERAMICS, ELECTRIC SPARK DEPOSITION, HARD ALLOY, MICROSTRUCTURE