Effect of electrospark alloying a tungsten hard alloy on its wear and corrosion resistance

An alternative to the surface modification of tungsten hard alloys by the PCVD method (from the point of view of economy and the level of useful properties) may be electrospark alloying (ESA). A study was made of the kinetics of mass transport in the ESA of a WC—6% Co alloy using an electrode materi...

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Bibliographic Details
Published in:Powder metallurgy and metal ceramics 1999-05, Vol.38 (5-6), p.250-253
Main Authors: Podchernyaeva, I A, Panasyuk, A D, Lavrenko, V A, Yuga, A I, Berezanskaya, V I
Format: Article
Language:English
Subjects:
Alloying
Alloying effects
Alloys
Cobalt base alloys
Coefficient of friction
Corrosion resistance
Corrosive wear
Economics
Electrode materials
High temperature
Mass transport
Mechanical properties
Oxidation
Oxidation resistance
Spark alloying
Titanium carbonitride
Tribology
Tungsten base alloys
Tungsten carbide
Wear resistance
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Summary:An alternative to the surface modification of tungsten hard alloys by the PCVD method (from the point of view of economy and the level of useful properties) may be electrospark alloying (ESA). A study was made of the kinetics of mass transport in the ESA of a WC—6% Co alloy using an electrode material based on TiCN, and of the tribological properties and high-temperature oxidation resistance of the coated hard alloy. It was found that in the range of low and medium velocities (≤6 m/sec) linear wear of the WC—6% Co alloy was decreased by a factor of 22 by ESA, and the coefficient of friction decreased from 0.42 to 0.18. The untreated alloy suffered a catastrophic weight gain at elevated temperatures, while coated WC—6% Co retained statisfactory oxidation resistance.
ISSN:1068-1302
1573-9066
DOI:10.1007/BF02675771