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  4. Thermally induced metallurgical processes in Cr3C2-NiCr thermal spray coatings as a function of carbide dissolution
 
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2017
Journal Article
Title

Thermally induced metallurgical processes in Cr3C2-NiCr thermal spray coatings as a function of carbide dissolution

Abstract
Cr3C2-NiCr thermal spray coatings are widely used to mitigate wear and corrosion at high temperatures. The aim of this work was to determine what minimum treatment temperature is required to transform the non-equilibrium as-sprayed coating composition back to an equilibrium composition, with the aim to improve the wear resistance. Cr3C2-NiCr coatings were sprayed using two HVOF techniques and a shrouded plasma spraying technique to produce samples with a broad spectrum of carbide dissolution and peritectic decomposition of Cr3C2. Shrouded plasma spraying was found to be highly effective in decreasing the carbon loss and the oxygen uptake. Differential scanning calorimetry (DSC) was used to characterize the exothermic solid-state phase transformations within the coatings. For the HVOF coatings, one main exothermic peak was observed, which was attributed to the crystallization of the amorphous Ni binder material. In the plasma spray coating an additional higher temperature peak was also observed. This was attributed to the transformation of (Cr,Ni)7C3 and a high Cr content Ni phase, into the equilibrium phases Cr3C2 and a low Cr content Ni binder.
Author(s)
Matthews, Steven
University of Auckland, Department of Chemical and Materials Engineering
Asadov, A.
Ruddell, S.
Berger, Lutz-Michael  
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Journal
Journal of alloys and compounds  
DOI
10.1016/j.jallcom.2017.08.246
Language
English
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Keyword(s)
  • amorphous material

  • coating material

  • Metal-Matrix Composite (MMC)

  • rapid-solidification

  • scanning electron microscopy

  • x-ray diffraction

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