Journal of Thermal Spray Technology

, Volume 20, Issue 6, pp 1209–1216

Enhanced Characteristics of HVOF-sprayed MCrAlY Bond Coats for TBC Applications

Peer Reviewed

DOI: 10.1007/s11666-011-9668-3

Cite this article as:
Rajasekaran, B., Mauer, G. & Vaßen, R. J Therm Spray Tech (2011) 20: 1209. doi:10.1007/s11666-011-9668-3

Abstract

This study is focused on the variation of the microstructures of different CoNiCrAlY bond coats sprayed by the high-velocity oxy-fuel (HVOF) process for thermal barrier coating (TBC) applications. Three different size fractions of the CoNiCrAlY bond coat powder have been considered for this investigation: AMDRY 9951 (5-37 μm), AMDRY 9954 (11-62 μm), and AMDRY 995C (45-75 μm). The influence of HVOF process parameters and process conditions have been studied in detail to achieve quality bond coats in terms of low porosity level, low oxygen content, and high surface roughness. The results have been promising and have shown that dense bond coats with low porosity can be achieved by HVOF spraying through the appropriate selection of powder size and process parameters. Importantly, HVOF bond coats appear to be competitive to VPS bond coats in terms of its oxygen content and high surface roughness.

Keywords

bond coats HVOF MCrAlY oxygen content surface roughness TBC 

Copyright information

© ASM International 2011

Authors and Affiliations

  1. 1.Institut für Energie- und Klimaforschung, IEK-1: Werkstoffe und HerstellungsverfahrenJülichGermany
  2. 2.Materials Technology Division, Metallurgy and Materials GroupIndira Gandhi Centre for Atomic ResearchChennaiIndia

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