High temperature corrosion of advanced ceramic materials for hot gas filters and heat exchangers. Final report

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Description

Experimental corrosion studies of hot gas filter materials and heat exchanger materials in oxidizing combustion environments have been initiated. Filter materials from 3M Co. and DuPont Lanxide Composites Inc. are being tested over a range of temperatures, times and gas flows. It has been demonstrated that morphological and phase changes due to corrosive effects occur after exposure of these materials to a simulated coal combustion environment for relatively short periods of time (10-50 hours). Heat exchanger tubes from DuPont Lanxide Composite Inc. were cut and infiltrated with Cr by heating in a Cr{sub 2}O{sub 3} powder bed. This resulted in ... continued below

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38 p.

Creation Information

Kupp, E.R.; Trubelja, K.E.; Spear, K.E. & Tressler, R.E. August 1, 1995.

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Description

Experimental corrosion studies of hot gas filter materials and heat exchanger materials in oxidizing combustion environments have been initiated. Filter materials from 3M Co. and DuPont Lanxide Composites Inc. are being tested over a range of temperatures, times and gas flows. It has been demonstrated that morphological and phase changes due to corrosive effects occur after exposure of these materials to a simulated coal combustion environment for relatively short periods of time (10-50 hours). Heat exchanger tubes from DuPont Lanxide Composite Inc. were cut and infiltrated with Cr by heating in a Cr{sub 2}O{sub 3} powder bed. This resulted in continuous Cr-rich layers with thicknesses ranging from 20 to 250 {mu}m. The Cr-free and the Cr-infiltrated specimens were reacted with the molten Illinois No. 6 slag for 2 and 20 h at 1260{degrees}C, and the reaction layers examined with SEM and EDX. In the Cr-free specimens, the segregation of Fe and the precipitation of Fe{sub 2}O{sub 3} were detected near the liquid/gas interface, but no evidence of corrosion was present. In the Cr-infiltrate specimens, corrosion was evident, since a rearrangement and segregation of the Cr-rich grains occurred toward the surface of the molten slag. In addition, evidence of the diffusion of major quantities of Fe was observed from the liquid slag into the Cr-rich layer formed by infiltration.

Physical Description

38 p.

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OSTI as DE96006233

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  • Other Information: PBD: Aug 1995

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  • Other: DE96006233
  • Report No.: ORNL/Sub--94-SS111/01
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/198674 | External Link
  • Office of Scientific & Technical Information Report Number: 198674
  • Archival Resource Key: ark:/67531/metadc664407

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  • August 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • May 2, 2016, 4:20 p.m.

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Kupp, E.R.; Trubelja, K.E.; Spear, K.E. & Tressler, R.E. High temperature corrosion of advanced ceramic materials for hot gas filters and heat exchangers. Final report, report, August 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc664407/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.