The influence of TiN content on erosion-corrosion behavior of Ti(C,N)-based cermets

Abstract

Four groups of titanium carbonitride based cermets with different TiN addition were fabricated by traditional powder metallurgy and the effects of TiN content on the microstructure and properties were discussed. A series of erosion-corrosion experiments were conducted in the slurry with 0.5 mol/L H 2SO4 and 5 wt.% Al2O3 particles. Grains are greatly refined and the thickness of rims decreases remarkably with TiN addition. The results indicate that in severe erosive condition the erosion-corrosion resistance is improved with the increase of TiN, and the Ti(C,N)-based cermet with 7.5 wt.% TiN introduction shows the best performance. Results also show that the erosion-corrosion is a complicated process containing both the effects of erosion and corrosion. The wear mechanism changes from chemical corrosion dominated to mechanical erosion leading as the impinging time increasing. The two wear mechanisms together accelerate the mass loss of material. © 2013 Elsevier Ltd. All rights reserved.