HIGH TEMPERATURE OXIDATION PERFORMANCE OF ALUMINIDE COATINGS

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Description

In order to determine the potential benefits and limitations of aluminide coatings, coatings made by chemical vapor deposition (CVD) on Fe- and Ni-base alloy substrates are being evaluated in various high-temperature environments. Testing of coatings on representative ferritic (Fe-9Cr-1Mo) and austenitic (type 304L stainless steel) alloys has found that high frequency thermal cycling (1h cycle time) can significantly degrade the coating. Based on comparison with similar specimens with no thermal cycling or a longer cycle time (100h), this degradation was not due to Al loss from the coating but most likely because of the thermal expansion mismatch between the coating ... continued below

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9 pages

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Pint, B.A.; Zhang, Y.; Haynes, J.A. & Wright, I.G. April 22, 2003.

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Description

In order to determine the potential benefits and limitations of aluminide coatings, coatings made by chemical vapor deposition (CVD) on Fe- and Ni-base alloy substrates are being evaluated in various high-temperature environments. Testing of coatings on representative ferritic (Fe-9Cr-1Mo) and austenitic (type 304L stainless steel) alloys has found that high frequency thermal cycling (1h cycle time) can significantly degrade the coating. Based on comparison with similar specimens with no thermal cycling or a longer cycle time (100h), this degradation was not due to Al loss from the coating but most likely because of the thermal expansion mismatch between the coating and the substrate. Several coated Ni-base alloys were tested in a high pressure (20atm) steam-CO2 environment for the ZEST (zero-emission steam turbine) program. Coated specimens showed less mass loss than the uncoated specimens after 1000h at 900 C and preliminary characterization examined the post-test coating structure and extent of attack.

Physical Description

9 pages

Notes

OSTI as DE00835690

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  • 17th Annual Conference on Fossil Energy Materials, Baltimore, MD (US), 04/22/2003--04/24/2003

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  • Report No.: none
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 835690
  • Archival Resource Key: ark:/67531/metadc779690

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Creation Date

  • April 22, 2003

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Nov. 3, 2016, 7:39 p.m.

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Pint, B.A.; Zhang, Y.; Haynes, J.A. & Wright, I.G. HIGH TEMPERATURE OXIDATION PERFORMANCE OF ALUMINIDE COATINGS, article, April 22, 2003; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc779690/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.