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Title: Characterization of chromia scales formed in supercritical carbon dioxide

Abstract

Initial experimental work at 700°–800 °C is in progress to develop a lifetime model for supercritical CO2 (sCO2) compatibility for a 30-year lifetime of a >700 °C concentrated solar power system. Nickel-based alloys 282, 740H and 625 and Fe-based alloy 25 are being evaluated in 500-h cycles at 1 and 300 bar, and 10-h cycles in 1 bar industrial grade CO2. The alloys showed similar low rates of oxidation in 1 and 300 bar CO2 in 500-h cycles at 750 °C. However, in 10-h cycles, alloy 25 showed accelerated attack at 700° and 750 °C. Transmission electron microscopy scale cross-sections on alloy 25 after 1000 h at 700 °C in sCO2 and in air only showed a small row of carbides beneath the scale in the former environment. Similar characterisation was performed on alloys 625 and 282 after sCO2 exposure at 750 °C.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1424457
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Journal Volume: 35; Journal Issue: 1-3; Conference: Microscopy of Oxidation 10th International Conference - Loughborough, , United Kingdom - 4/3/2017 4:00:00 AM-4/5/2017 4:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Pint, Bruce A., Unocic, Kinga A., Brese, Robert G., and Keiser, James R. Characterization of chromia scales formed in supercritical carbon dioxide. United States: N. p., 2017. Web. doi:10.1080/09603409.2017.1389371.
Pint, Bruce A., Unocic, Kinga A., Brese, Robert G., & Keiser, James R. Characterization of chromia scales formed in supercritical carbon dioxide. United States. doi:10.1080/09603409.2017.1389371.
Pint, Bruce A., Unocic, Kinga A., Brese, Robert G., and Keiser, James R. Sun . "Characterization of chromia scales formed in supercritical carbon dioxide". United States. doi:10.1080/09603409.2017.1389371. https://www.osti.gov/servlets/purl/1424457.
@article{osti_1424457,
title = {Characterization of chromia scales formed in supercritical carbon dioxide},
author = {Pint, Bruce A. and Unocic, Kinga A. and Brese, Robert G. and Keiser, James R.},
abstractNote = {Initial experimental work at 700°–800 °C is in progress to develop a lifetime model for supercritical CO2 (sCO2) compatibility for a 30-year lifetime of a >700 °C concentrated solar power system. Nickel-based alloys 282, 740H and 625 and Fe-based alloy 25 are being evaluated in 500-h cycles at 1 and 300 bar, and 10-h cycles in 1 bar industrial grade CO2. The alloys showed similar low rates of oxidation in 1 and 300 bar CO2 in 500-h cycles at 750 °C. However, in 10-h cycles, alloy 25 showed accelerated attack at 700° and 750 °C. Transmission electron microscopy scale cross-sections on alloy 25 after 1000 h at 700 °C in sCO2 and in air only showed a small row of carbides beneath the scale in the former environment. Similar characterisation was performed on alloys 625 and 282 after sCO2 exposure at 750 °C.},
doi = {10.1080/09603409.2017.1389371},
journal = {},
number = 1-3,
volume = 35,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}

Conference:
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