The microstructure and mechanical reliability of alumina scales and coatings

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Alumina scales on iron-aluminides (Fe{sub 3}Al-based) and NiCrAl- based alloys were characterized in order to develop the knowledge to control the oxidation performance of alloys by controlling the microstructure and microchemistry of their scales. Plasma-deposited amorphous alumina coatings on iron-aluminides were used to study phase transformations, transport processes in the scales, and S segregation to the scale/metal interface. It was found that during heat treatment in absence of oxidation, amorphous coatings first transform to {gamma}-Al{sub 2}O{sub 3} and eventually {alpha}-Al{sub 2}O{sub 3} nucleates at the scale/metal interface. Sulfur from the Zr- free alloy segregates to the scale/metal interface during heat ... continued below

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13 p.

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Alexander, K.B.; Pruessner, K. & Tortorelli, P.F. September 1, 1997.

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Description

Alumina scales on iron-aluminides (Fe{sub 3}Al-based) and NiCrAl- based alloys were characterized in order to develop the knowledge to control the oxidation performance of alloys by controlling the microstructure and microchemistry of their scales. Plasma-deposited amorphous alumina coatings on iron-aluminides were used to study phase transformations, transport processes in the scales, and S segregation to the scale/metal interface. It was found that during heat treatment in absence of oxidation, amorphous coatings first transform to {gamma}-Al{sub 2}O{sub 3} and eventually {alpha}-Al{sub 2}O{sub 3} nucleates at the scale/metal interface. Sulfur from the Zr- free alloy segregates to the scale/metal interface during heat treatment. Thermally grown scales on Zr-doped iron-aluminides were compared to those formed after oxidation of a specimen with an alumina coating. Microstructural and gravimetric results showed that the primarily amorphous alumina coating promoted the nucleation and growth of metastable alumina phases, which resulted in more rapid oxidation. The thermally grown oxide was found on top of the coating. The NiCrAl-based alloys formed columnar alumina scales underneath a layer of mixed oxides. Segregation of alloying elements like Y, Hf, and At was found at both oxide grain boundaries and scale/metal interfaces.

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13 p.

Notes

OSTI as DE97008447

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  • 11. annual conference on fossil energy materials, Knoxville, TN (United States), 20-22 May 1997

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  • Other: DE97008447
  • Report No.: CONF-9705115--3
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 520703
  • Archival Resource Key: ark:/67531/metadc696577

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 25, 2016, 6:47 p.m.

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Alexander, K.B.; Pruessner, K. & Tortorelli, P.F. The microstructure and mechanical reliability of alumina scales and coatings, article, September 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc696577/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.