Chromium-Aluminide Coatings via Pack Cementation Method on Inconel 718 Alloy and Fe-Cr-Ni SuperAlloy

Year 2019, Volume: 23 Issue: 5, 817 - 823, 01.10.2019

Tuba Yener

https://doi.org/10.16984/saufenbilder.495407

Cited By: 4

Abstract

In
this study, it is invastigated the low-temperature formation of chromium
aluminide coatings on a CrNiFe-base superalloy and Inconel 718 by pack
cementation process. A novel pack-aluminizing diffusion coating was applied at
800°C during 4 and 6 hours.The chrom-aluminising powder packs were prepared
using aluminium and chromium powders as a source for depositing aluminium and
chrominium, Al₂O₃ powder as an inert filler and ammonium
chloride NH₄Cl as an activator. A scanning electron microscope (SEM)
with energy dispersive X-ray spectrometer (EDS) and XRD were used to
characterize the surface layers. SEM analysis revealed that coating layers were
homogenous, compact and nonporous and there was a good bonding at the interface
of the coating and matrix. Layer thickness variation was changed from 11,17 to
18,2 µm measured from the surface to the matrix. The hardness of the coating
layer increased to 1000 HVN while the hardness of the matrix was 350 HVN with
the increasing process time.

Keywords

Low Tempeture pack Aluminising, Chromising, layer thickness

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