Effect of boron on the oxidation behavior of NiCrAlYHfTi in H2O and CO2 environments

K. A. Unocic; D. N. Leonard; B. A. Pint

doi:10.1016/j.surfcoat.2014.06.074

Effect of boron on the oxidation behavior of NiCrAlYHfTi in H₂O and CO₂ environments

K. A. Unocic, D. N. Leonard, B. A. Pint

Oak Ridge National Laboratory

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

15 Scopus citations

Abstract

Cast NiCrAl alloys, co-doped with Y, Hf, Ti, and/or B, were evaluated at 1100°C and 1150°C in dry air, wet air (10 or 50% H₂O), and CO₂-10% H₂O, in order to study the effect of boron additions on alumina scale growth and adhesion. After 200, 1-h cycles at 1100°C, all of the alloys with Y and Hf showed good scale adhesion. By increasing the test temperature to 1150°C, the addition of ~0.3at.% (0.07wt.%) B was shown to improve alumina scale adhesion during 1-h cycles in air with 10% H₂O. Analytical transmission electron microscopy showed no effect of B on the alumina scale microstructure and only minor effects on the depth of internal oxidation at 1100°C. Combined Ti and B additions did not produce an additional benefit and Cr-B precipitates were detected in both B-doped alloys. Exposures in O₂-buffered CO₂-H₂O did not result in any detrimental effect at 1100°C.

Original language	English
Pages (from-to)	17-22
Number of pages	6
Journal	Surface and Coatings Technology
Volume	260
DOIs	https://doi.org/10.1016/j.surfcoat.2014.06.074
State	Published - Dec 15 2014

Bibliographical note

Publisher Copyright:
© 2014 Elsevier B.V.

Funding

The authors would like to thank P. F. Tortorelli, H. Meyer, T. M. Lowe, G. W. Garner, T. Geer, T. Jordan and D.W. Coffey for assistance with the experimental work and for S. Dryepondt and M. P. Brady for comments on the manuscript. Research supported by the U.S. Department of Energy (DOE), Office of Coal and Power R&D in the Office of Fossil Energy, and by the Center for Nanophase Materials Sciences (CNMS), which is sponsored by the Scientific User Facilities Division, DOE Office of Basic Energy Sciences.

Funders	Funder number
Center for Nanophase Materials Sciences
DOE Office of Basic Energy Sciences
Office of Coal and Power R&D
U.S. Department of Energy
Office of Fossil Energy

Keywords

Boron
CO
NiCrAl
Reactive elements
Water vapor
α-AlO

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10.1016/j.surfcoat.2014.06.074

Cite this

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title = "Effect of boron on the oxidation behavior of NiCrAlYHfTi in H2O and CO2 environments",

abstract = "Cast NiCrAl alloys, co-doped with Y, Hf, Ti, and/or B, were evaluated at 1100°C and 1150°C in dry air, wet air (10 or 50% H2O), and CO2-10% H2O, in order to study the effect of boron additions on alumina scale growth and adhesion. After 200, 1-h cycles at 1100°C, all of the alloys with Y and Hf showed good scale adhesion. By increasing the test temperature to 1150°C, the addition of ~0.3at.% (0.07wt.%) B was shown to improve alumina scale adhesion during 1-h cycles in air with 10% H2O. Analytical transmission electron microscopy showed no effect of B on the alumina scale microstructure and only minor effects on the depth of internal oxidation at 1100°C. Combined Ti and B additions did not produce an additional benefit and Cr-B precipitates were detected in both B-doped alloys. Exposures in O2-buffered CO2-H2O did not result in any detrimental effect at 1100°C.",

keywords = "Boron, CO, NiCrAl, Reactive elements, Water vapor, α-AlO",

author = "Unocic, {K. A.} and Leonard, {D. N.} and Pint, {B. A.}",

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doi = "10.1016/j.surfcoat.2014.06.074",

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AU - Unocic, K. A.

AU - Leonard, D. N.

AU - Pint, B. A.

PY - 2014/12/15

Y1 - 2014/12/15

N2 - Cast NiCrAl alloys, co-doped with Y, Hf, Ti, and/or B, were evaluated at 1100°C and 1150°C in dry air, wet air (10 or 50% H2O), and CO2-10% H2O, in order to study the effect of boron additions on alumina scale growth and adhesion. After 200, 1-h cycles at 1100°C, all of the alloys with Y and Hf showed good scale adhesion. By increasing the test temperature to 1150°C, the addition of ~0.3at.% (0.07wt.%) B was shown to improve alumina scale adhesion during 1-h cycles in air with 10% H2O. Analytical transmission electron microscopy showed no effect of B on the alumina scale microstructure and only minor effects on the depth of internal oxidation at 1100°C. Combined Ti and B additions did not produce an additional benefit and Cr-B precipitates were detected in both B-doped alloys. Exposures in O2-buffered CO2-H2O did not result in any detrimental effect at 1100°C.

AB - Cast NiCrAl alloys, co-doped with Y, Hf, Ti, and/or B, were evaluated at 1100°C and 1150°C in dry air, wet air (10 or 50% H2O), and CO2-10% H2O, in order to study the effect of boron additions on alumina scale growth and adhesion. After 200, 1-h cycles at 1100°C, all of the alloys with Y and Hf showed good scale adhesion. By increasing the test temperature to 1150°C, the addition of ~0.3at.% (0.07wt.%) B was shown to improve alumina scale adhesion during 1-h cycles in air with 10% H2O. Analytical transmission electron microscopy showed no effect of B on the alumina scale microstructure and only minor effects on the depth of internal oxidation at 1100°C. Combined Ti and B additions did not produce an additional benefit and Cr-B precipitates were detected in both B-doped alloys. Exposures in O2-buffered CO2-H2O did not result in any detrimental effect at 1100°C.

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KW - Water vapor

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