Cyclic oxidation of high temperature coatings on new γ′-strengthened cobalt-based alloys
Corrosion science, 2013•Elsevier
An emerging class of cobalt-based γ′-strengthened alloys promises higher temperature
capabilities compared to current Ni-base superalloys commonly used in aerospace and
power generation applications. As with Ni-base alloys, high temperature coatings that
enhance environmental resistance are desirable. Single crystal samples of Co–9.2 Al–9.0 W
and Co–7.8 Al–7.8 W–4.5 Cr–2.0 Ta (at.%) were coated with vapour phase nickel aluminide
and MCrAlY. Samples were subjected to cyclic oxidation at 1100° C with 300–450 1-h …
capabilities compared to current Ni-base superalloys commonly used in aerospace and
power generation applications. As with Ni-base alloys, high temperature coatings that
enhance environmental resistance are desirable. Single crystal samples of Co–9.2 Al–9.0 W
and Co–7.8 Al–7.8 W–4.5 Cr–2.0 Ta (at.%) were coated with vapour phase nickel aluminide
and MCrAlY. Samples were subjected to cyclic oxidation at 1100° C with 300–450 1-h …
Abstract
An emerging class of cobalt-based γ′-strengthened alloys promises higher temperature capabilities compared to current Ni-base superalloys commonly used in aerospace and power generation applications. As with Ni-base alloys, high temperature coatings that enhance environmental resistance are desirable. Single crystal samples of Co–9.2Al–9.0W and Co–7.8Al–7.8W–4.5Cr–2.0Ta (at.%) were coated with vapour phase nickel aluminide and MCrAlY. Samples were subjected to cyclic oxidation at 1100 °C with 300–450 1-h cycles. Compared to NiAl-based coatings, the MCrAlY coatings exhibited superior adherence and an interdiffusion zone free of detrimental intermetallic phases. Evolution of microstructure during cycling is discussed with reference to the available thermodynamic data.
Elsevier
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