Hot corrosivity of coal gasification products on gas turbine alloys. Summary report, 15 April 1978-15 November 1979

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The results of this investigation have produced mechanisms for the hot corrosion of a number of pure metals and alloys in the types of atmospheres likely to be obtained in turbines using coal conversion products as fuel. The results of these mechanistic studies suggest the following conclusions regarding application of alloys in these situations: (1) Simple Cr/sub 2/O/sub 3/-forming alloys of both Co and Ni have good hot corrosion resistance to most of the deposits likely to form in turbines burning coal conversion products with the exception of deposits containing considerable amounts of chlorides. (2) The presence of carbide phases ... continued below

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Pages: 115

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Meier, G.H. & Gulbransen, E.A. January 1, 1979.

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Description

The results of this investigation have produced mechanisms for the hot corrosion of a number of pure metals and alloys in the types of atmospheres likely to be obtained in turbines using coal conversion products as fuel. The results of these mechanistic studies suggest the following conclusions regarding application of alloys in these situations: (1) Simple Cr/sub 2/O/sub 3/-forming alloys of both Co and Ni have good hot corrosion resistance to most of the deposits likely to form in turbines burning coal conversion products with the exception of deposits containing considerable amounts of chlorides. (2) The presence of carbide phases is detrimental to the hot corrosion resistance of both Ni and Co alloys. (3) The complex alloy compositions characteristic of superalloys result in susceptibility to hot corrosion, the extent of which is sensitive to salt composition, particularly for Ni-base alloys. (4) Conclusion 3 suggests that uncoated alloys will not be able to provide the require combination of corrosion resistance and high-temperature strength for any of the components in turbines running on coal gas. (5) Several alloys including Co-18Cr-6Al-1Hf, Co-27Cr, Co-20Ni-27Cr, Ni-50Cr, and Fe-18Cr-6Al-Hf have corrosion resistance for use as coatings and claddings at high temperatures (900 to 1000/sup 0/C). (6) The problem of low temperature hot corrosion (700 to 800/sup 0/C) must still be investigated for the types of deposits likely to form in coal fired systems before selection of reliable coatings can be made.

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Pages: 115

Notes

NTIS, PC A06/MF A01.

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  • Report No.: DOE/ET/13547-T1
  • Grant Number: AC01-79ET13547
  • DOI: 10.2172/5253538 | External Link
  • Office of Scientific & Technical Information Report Number: 5253538
  • Archival Resource Key: ark:/67531/metadc1065873

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 4, 2018, 12:10 p.m.

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Meier, G.H. & Gulbransen, E.A. Hot corrosivity of coal gasification products on gas turbine alloys. Summary report, 15 April 1978-15 November 1979, report, January 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1065873/: accessed August 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.