Conferences

Contribution of electrospark alloying to the oxidation resistance of hard tungsten alloys

A.D. Verkhoturov,
 
A.M. Shpilev,
 
P.S. Gordienko,
 
L.A. Konevtsov,
 
E.S. Panin,
 
I.Podchernyaeva,
 
A.D. Panasyuk
 

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, #01/02
http://www.materials.kiev.ua/article/694

Abstract

Electric spark alloying influence on heat-resistance increase of tungsten hard alloys. Carbide oxidation is established to be determined by peculiarities of electronic structure. Fragile oxide scale from W03 and CoWО4 forms intensively during heating of WC and tungsten hard alloys to 10000С. Heat-resistance decreases in sequence: TiC ->Со -> W ->ВТС (containing TiC above 10%) -> WC - Co -> WC. Oxidability of tungsten hard alloys may be applied as an efficiency criterion. Tungsten hard alloys heat-resistance increases significantly after electric spark alloying with Aluminium, Titanium, Chrome, and durable compositional ceramics based on system ZrB2-ZrSi2-LaB6 bound with Ni-Cr (30%) (mol.))


CARBIDES, CERAMICS, ELECTRIC SPARK DEPOSITION, ELECTRON STRUCTURE, HARD TUNGSTEN ALLOYS, HEAT-RESISTANCE, OXIDATION