Microstructure and oxidation behavior of a Ni+CrAlYSiHfN/AlN multilayer coating fabricated by reactive magnetron sputtering. (March 2016)

• Record Type: Journal Article
• Authors: Ren, Pan; Zhu, Shenglong; Wang, Fuhui
• Is Part Of: Corrosion science. Volume 104(2016)
• Page Start: 197
• Page End: 206
• Publication Date: 2016-03
• Subjects: A. Superalloys -- A. Metal coatings -- B. STEM -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.12.012
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: A multilayer coating composed of alternating Ni+CrAlYSiHfN and Al x N layers was prepared by reactive sputtering. This multilayer coating exhibited better oxidation resistance than the NiCrAlYSiHf coating at 1050 °C and 1100 °C. The micro-hardness of the multilayer coating is higher than that of the NiCrAlYSiHf coating. Abstract: A multilayer coating, about 40 μm thick, was prepared on superalloy René N5 by reactive sputtering from a NiCrAlYHfSi target and an Al target. The as-deposited coating comprised alternating γ-Ni+CrN+hcp-AlN layers, about 300 nm thick, and hcp-AlN + Al layers, about 400 nm thick. XRD analysis showed that CrN and Al disappeared and β-NiAl was formed in the coating after annealing at 1000 °C. The multilayer coating exhibited good oxidation resistance by forming thin and adherent alumina scales at 1050 °C and 1100 °C, and better spallation resistance of oxide scale than sputtered NiCrAlYHfSi coating.