A new concept of oxidation protection of Ni-base alloys by using the halogen effect

Zschau, H.‐E.; Renusch, D.; Masset, Patrick J.; Schütze, M.

doi:10.1179/096034009x440245

Cited by 6 publications

(16 citation statements)

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“…The present work follows that of our previous study in which the effect of F-ion implantation on the oxidation behavior of the Ni-base superalloy IN738 was assessed [3]. To achieve the same ion range as for the previously-studied IN738, additional SRIM-calculations [7] of the energy-range relation were made for all four model alloys studied.…”

Section: Fluorine-ion Implantationmentioning

confidence: 98%

“…For instance, the Ni-base superalloy IN738 was found to exhibit improved oxidation resistance after being doped by fluorine-ion implantation at the surface [3]. It was postulated that gaseous Al-fluorides can form within pores and microcracks at the interface of the initial oxide scale and the underlying substrate during subsequent oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…It was recently shown that the change from non-protective internal oxidation to the formation of a protective alumina scale can be facilitated by enriching the alloy surface with a halogen [3,4]. For instance, the Ni-base superalloy IN738 was found to exhibit improved oxidation resistance after being doped by fluorine-ion implantation at the surface [3].…”

Section: Introductionmentioning

confidence: 99%

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Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect

et al. 2015

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The halogen effect, which involves the surface enrichment of an alloy with a halogen element to result in improved oxidation resistance, was assessed using model Ni-based Ni-Cr-Al alloys. The alloys studied varied in composition in a manner that produced sub-critical, borderline and protective intrinsic oxidation behaviours from the standpoint of being able to form a continuous Al 2 O 3 scale. Fluorine-ion implantation allowed for a well-defined surface doping of the alloys. It was found that this doping could promote protective Al 2 O 3 -scale formation during oxidation at 900 and 1,000°C in both dry and steam-containing atmospheres. Specifically, the beneficial halogen effect was manifested by lowering the critical Al content in Ni-Cr-Al alloys needed for Al 2 O 3 -scale formation.

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Section: Fluorine-ion Implantationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect

et al. 2015

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“…[18] remaining discontinuous scale of inward growing alumina a 25-30 mm thick zone enriched with nitrides exists. As a result of the screening the F-effect was found to be working between 5 Â 10 16 and 4 Â 10 17 F/cm 2 [7]. Optimum implantation parameters are between 5 Â 10 16 and 1 Â 10 17 F/ cm 2 .…”

Section: Screening Of the Fluorine Concentrationsmentioning

confidence: 98%

“…The change of the oxidation mechanism from internally growing alumina to external oxidation of aluminium leads to the formation of a dense protective alumina scale. After reporting about the results of the first experiments [7] more detailed work followed which will be presented here. By using thermodynamic considerations the existence of the halogen effect for the Ni-base superalloys IN738 and IN939 is discussed for fluorine and chlorine.…”

Section: Introductionmentioning

confidence: 99%

Oxidation protection of Ni‐base superalloys by halogen treatment

Zschau

Masset

Schütze

2011

Materials & Corrosion

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A new concept of oxidation protection is proposed for Ni‐base alloys with Al‐amounts of 2–5 wt%. Following Wagner's theory of oxidation the formation of a dense protective alumina scale is possible if the Al‐activity is sufficiently high. This condition can be fulfilled by using the halogen effect. Thermodynamical calculations reveal the existence of regions for a positive effect of F and Cl for the alloys IN738 and IN939. In the case of fluorine these results are transformed into F concentrations in a screening by using ion implantation. By the F‐effect the oxidation mechanism at 1050 °C/air was changed from internal oxidation of Al to an external formation of an Al2O3 – scale. Optimal implantation parameters were defined. The formation and stability of the protective alumina scale was proved within 1000 h/1050 °C.

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Potential of the Halogen Effect for the Formation of a Protective Alumina Scale on Ni‐Base Superalloys

Zschau¹,

Schütze²

2012

Superalloys 2012

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The application of the halogen effect was extended to Ni-base superalloys with low aluminium content. A dense protective alumina scale can be formed by increasing the Al-activity through the halogen effect. Thermodynamic calculations predicted the existence of a region for the F-and Cl-effect for the alloys IN738 and IN939 at temperatures between 900°C and 1200°C. The suitable F-and Cl-concentrations were found for IN738 by using ion implantation. The oxidation mechanism changed from an inward-growing discontinuous scale to a dense continuous protective alumina layer. The F-effect on IN738 improves the oxidation resistance during long term oxidation. By using the Feffect a pure alumina scale was also obtained for alloy CMSX-4.

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A new concept of oxidation protection of Ni-base alloys by using the halogen effect

Cited by 6 publications

References 0 publications

Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect

Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect

Oxidation protection of Ni‐base superalloys by halogen treatment

Potential of the Halogen Effect for the Formation of a Protective Alumina Scale on Ni‐Base Superalloys

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