Cyclic oxidation behavior of HVOF bond coatings deposited on La- and Y-doped superalloys

B. A. Pint; M. A. Bestor; J. A. Haynes

doi:10.1016/j.surfcoat.2011.06.044

Cyclic oxidation behavior of HVOF bond coatings deposited on La- and Y-doped superalloys

B. A. Pint, M. A. Bestor, J. A. Haynes

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

21 Scopus citations

Abstract

One suggested strategy for improving the performance of thermal barrier coating (TBC) systems used to protect hot section components in gas turbines is the addition of low levels of dopants to the Ni-base superalloy substrate. To quantify the benefit of these dopants, the oxidation behavior of three commercial superalloys with different Y and La contents was evaluated with and without a NiCoCrAlYHfSi bond coating deposited by high velocity oxygen fuel (HVOF) spraying. Cyclic oxidation experiments were conducted in dry O₂ at 1050°, 1100° and 1150°C. At the highest temperature, the bare superalloy without La showed more attack due to its lower Al content but no difference in oxidation rate or scale adhesion was noted at lower temperatures. With a bond coating, the alumina scale was non-uniform in thickness and spalled at each temperature. Among the three coated superalloys, no clear difference in oxide growth rate or scale adhesion was observed. Evaluations with a YSZ top coat and a bond coating without Hf are needed to better determine the effect of superalloy dopants on high temperature oxidation performance.

Original language	English
Pages (from-to)	1600-1604
Number of pages	5
Journal	Surface and Coatings Technology
Volume	206
Issue number	7
DOIs	https://doi.org/10.1016/j.surfcoat.2011.06.044
State	Published - Dec 25 2011

Funding

The authors would like to thank G. W. Garner, M. Stephens, T. M. Lowe, R. Parten and H. Longmire for assistance with the experimental work. K. Murphy at Howmet Corp. generously provided the superalloys and the detailed compositions. The HVOF coatings were fabricated by Stonybrook Univ. S. Dryepondt provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy , Office of Coal and Power R&D, Office of Fossil Energy, (R. Dennis program manager).

Funders	Funder number
Office of Coal and Power R&D
U.S. Department of Energy
Office of Fossil Energy

Keywords

High temperature oxidation
MCrAlY coating
Reactive element additions
Superalloy

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10.1016/j.surfcoat.2011.06.044

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title = "Cyclic oxidation behavior of HVOF bond coatings deposited on La- and Y-doped superalloys",

abstract = "One suggested strategy for improving the performance of thermal barrier coating (TBC) systems used to protect hot section components in gas turbines is the addition of low levels of dopants to the Ni-base superalloy substrate. To quantify the benefit of these dopants, the oxidation behavior of three commercial superalloys with different Y and La contents was evaluated with and without a NiCoCrAlYHfSi bond coating deposited by high velocity oxygen fuel (HVOF) spraying. Cyclic oxidation experiments were conducted in dry O2 at 1050°, 1100° and 1150°C. At the highest temperature, the bare superalloy without La showed more attack due to its lower Al content but no difference in oxidation rate or scale adhesion was noted at lower temperatures. With a bond coating, the alumina scale was non-uniform in thickness and spalled at each temperature. Among the three coated superalloys, no clear difference in oxide growth rate or scale adhesion was observed. Evaluations with a YSZ top coat and a bond coating without Hf are needed to better determine the effect of superalloy dopants on high temperature oxidation performance.",

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AU - Bestor, M. A.

AU - Haynes, J. A.

PY - 2011/12/25

Y1 - 2011/12/25

N2 - One suggested strategy for improving the performance of thermal barrier coating (TBC) systems used to protect hot section components in gas turbines is the addition of low levels of dopants to the Ni-base superalloy substrate. To quantify the benefit of these dopants, the oxidation behavior of three commercial superalloys with different Y and La contents was evaluated with and without a NiCoCrAlYHfSi bond coating deposited by high velocity oxygen fuel (HVOF) spraying. Cyclic oxidation experiments were conducted in dry O2 at 1050°, 1100° and 1150°C. At the highest temperature, the bare superalloy without La showed more attack due to its lower Al content but no difference in oxidation rate or scale adhesion was noted at lower temperatures. With a bond coating, the alumina scale was non-uniform in thickness and spalled at each temperature. Among the three coated superalloys, no clear difference in oxide growth rate or scale adhesion was observed. Evaluations with a YSZ top coat and a bond coating without Hf are needed to better determine the effect of superalloy dopants on high temperature oxidation performance.

AB - One suggested strategy for improving the performance of thermal barrier coating (TBC) systems used to protect hot section components in gas turbines is the addition of low levels of dopants to the Ni-base superalloy substrate. To quantify the benefit of these dopants, the oxidation behavior of three commercial superalloys with different Y and La contents was evaluated with and without a NiCoCrAlYHfSi bond coating deposited by high velocity oxygen fuel (HVOF) spraying. Cyclic oxidation experiments were conducted in dry O2 at 1050°, 1100° and 1150°C. At the highest temperature, the bare superalloy without La showed more attack due to its lower Al content but no difference in oxidation rate or scale adhesion was noted at lower temperatures. With a bond coating, the alumina scale was non-uniform in thickness and spalled at each temperature. Among the three coated superalloys, no clear difference in oxide growth rate or scale adhesion was observed. Evaluations with a YSZ top coat and a bond coating without Hf are needed to better determine the effect of superalloy dopants on high temperature oxidation performance.

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KW - Reactive element additions

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Cyclic oxidation behavior of HVOF bond coatings deposited on La- and Y-doped superalloys

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