Production and Properties of Oxidation-Resistant Spark Coatings on Titanium Alloys

A.Paustovskiy,
 
Y.Tkachenko,
 
R.Alfinceva,
 
D.Yurchenko,
  
L.P.Isaeva
 

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, 2012, #01/02
http://www.materials.kiev.ua/article/983

Abstract

The paper examines the formation, on titanic alloys, of spark-deposited coatings from Ni–Cr–Al alloy pressed and sintered in vacuum. The electrospark parameters are optimized to obtain coatings with a thickness to 30 µm, density not lower than 80%, and hardness about 8 GPa. It is shown that spark-deposited coatings on VT6 and VT22 alloys permit increase in their oxidation resistance by a factor of 1.5 to 2.5 during isothermal holding at 800 0C. This increase is due to the formation of oxidation-resistant titanium phases on coatings, which prevent the diffusion of elements from air into the coating.


ALUMINUM, CHROMIUM, COATINGS, ELECTRIC SPARK DEPOSITION, ELECTRODE MATERIAL, NICKEL, OXIDATION RESISTANCE, PHASE COMPOSITION, TITANIUM ALLOYS