Oxidation mechanisms of lanthanum-alloyed Mo-Si-B

Sanjib Majumdar; Bronislava Gorr; Hans-Jürgen Christ; Daniel Schliephake; Martin Heilmaier

doi:10.1016/j.corsci.2014.07.058

Oxidation mechanisms of lanthanum-alloyed Mo-Si-B

Sanjib Majumdar, Bronislava Gorr, Hans-Jürgen Christ, Daniel Schliephake, Martin Heilmaier

Research output: Contribution to journal › Article › Research › peer-review

49 Citations (Scopus)

Abstract

High temperature oxidation behavior of a Mo-9Si-8B (at.%) alloy containing 0.2 and 2at.% La was studied between 750 and 1400°C in static air. Isothermal thermogravimetric analysis for up to 72h indicated a significant improvement in the oxidation resistance of the 2La-alloyed material in the 750-1000°C temperature range. The oxide layers characterized by XRD, SEM, EDS, and FIB-TEM revealed the formation of more stable lanthanum-molybdates (xLa₂O₃{dot operator}yMoO₃), which reduces the evaporation of MoO₃ below 1000°C. The thickness data obtained for the external scale and the inner oxidation layers indicated a reduction of inward diffusion of oxygen with higher La concentrations.

Original language	English
Pages (from-to)	360-371
Number of pages	12
Journal	Corrosion Science
Volume	88
DOIs	https://doi.org/10.1016/j.corsci.2014.07.058
Publication status	Published - 1 Nov 2014
Externally published	Yes

Keywords

A. Rare earth elements
B. SEM
B. TEM
C. High temperature corrosion
C. Oxidation

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10.1016/j.corsci.2014.07.058

Cite this

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title = "Oxidation mechanisms of lanthanum-alloyed Mo-Si-B",

abstract = "High temperature oxidation behavior of a Mo-9Si-8B (at.%) alloy containing 0.2 and 2at.% La was studied between 750 and 1400°C in static air. Isothermal thermogravimetric analysis for up to 72h indicated a significant improvement in the oxidation resistance of the 2La-alloyed material in the 750-1000°C temperature range. The oxide layers characterized by XRD, SEM, EDS, and FIB-TEM revealed the formation of more stable lanthanum-molybdates (xLa2O3{dot operator}yMoO3), which reduces the evaporation of MoO3 below 1000°C. The thickness data obtained for the external scale and the inner oxidation layers indicated a reduction of inward diffusion of oxygen with higher La concentrations.",

keywords = "A. Rare earth elements, B. SEM, B. TEM, C. High temperature corrosion, C. Oxidation",

author = "Sanjib Majumdar and Bronislava Gorr and Hans-J{\"u}rgen Christ and Daniel Schliephake and Martin Heilmaier",

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doi = "10.1016/j.corsci.2014.07.058",

language = "English",

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journal = "Corrosion Science",

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TY - JOUR

T1 - Oxidation mechanisms of lanthanum-alloyed Mo-Si-B

AU - Majumdar, Sanjib

AU - Gorr, Bronislava

AU - Christ, Hans-Jürgen

AU - Schliephake, Daniel

AU - Heilmaier, Martin

PY - 2014/11/1

Y1 - 2014/11/1

N2 - High temperature oxidation behavior of a Mo-9Si-8B (at.%) alloy containing 0.2 and 2at.% La was studied between 750 and 1400°C in static air. Isothermal thermogravimetric analysis for up to 72h indicated a significant improvement in the oxidation resistance of the 2La-alloyed material in the 750-1000°C temperature range. The oxide layers characterized by XRD, SEM, EDS, and FIB-TEM revealed the formation of more stable lanthanum-molybdates (xLa2O3{dot operator}yMoO3), which reduces the evaporation of MoO3 below 1000°C. The thickness data obtained for the external scale and the inner oxidation layers indicated a reduction of inward diffusion of oxygen with higher La concentrations.

AB - High temperature oxidation behavior of a Mo-9Si-8B (at.%) alloy containing 0.2 and 2at.% La was studied between 750 and 1400°C in static air. Isothermal thermogravimetric analysis for up to 72h indicated a significant improvement in the oxidation resistance of the 2La-alloyed material in the 750-1000°C temperature range. The oxide layers characterized by XRD, SEM, EDS, and FIB-TEM revealed the formation of more stable lanthanum-molybdates (xLa2O3{dot operator}yMoO3), which reduces the evaporation of MoO3 below 1000°C. The thickness data obtained for the external scale and the inner oxidation layers indicated a reduction of inward diffusion of oxygen with higher La concentrations.

KW - A. Rare earth elements

KW - B. SEM

KW - B. TEM

KW - C. High temperature corrosion

KW - C. Oxidation

UR - http://www.scopus.com/inward/record.url?scp=84906786319&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2014.07.058

DO - 10.1016/j.corsci.2014.07.058

M3 - Article

AN - SCOPUS:84906786319

SN - 0010-938X

VL - 88

SP - 360

EP - 371

JO - Corrosion Science

JF - Corrosion Science

ER -

Oxidation mechanisms of lanthanum-alloyed Mo-Si-B

Abstract

Keywords

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