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Title: Novel Functionally Graded Thermal Barrier Coatings in Coal-Fired Power Plant Turbines

Abstract

This project presents a detailed investigation of a novel functionally graded coating material, pyrochlore oxide, for thermal barrier coating (TBC) in gas turbines used in coal-fired power plants. Thermal barrier coatings are refractory materials deposited on gas turbine components, which provide thermal protection for metallic components at operating conditions. The ultimate goal of this research is to develop a manufacturing process to produce the novel low thermal conductivity and high thermal stability pyrochlore oxide based coatings with improved high-temperature durability. The current standard TBC, yttria stabilized zirconia (YSZ), has service temperatures limited to <1200°C, due to sintering and phase transition at higher temperatures. In contrast, pyrochlore oxide, e.g., lanthanum zirconate (La2Zr2O7, LZ), has demonstrated lower thermal conductivity and better thermal stability, which are crucial to high temperature applications, such as gas turbines used in coal-fired power plants. Indiana University – Purdue University Indianapolis (IUPUI) has collaborated with Praxair Surface Technologies (PST), and Changwon National University in South Korea to perform the proposed research. The research findings are critical to the extension of current TBCs to a broader range of high-temperature materials and applications. Several tasks were originally proposed and accomplished, with additional new opportunities identified during the course of themore » project. In this report, a description of the project tasks, the main findings and conclusions are given. A list of publications and presentations resulted from this research is listed in the Appendix at the end of the report.« less

Authors:
ORCiD logo [1]
  1. Indiana Univ., Indianapolis, IN (United States)
Publication Date:
Research Org.:
Indiana Univ., Indianapolis, IN (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
Contributing Org.:
Praxair Surface Technologies; Changwon National University; Argonne National Laboratory
OSTI Identifier:
1369643
Report Number(s):
DOE-IUPUI-0008868
DOE Contract Number:  
FE0008868
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; thermal barrier coating; TBC; pyrochlore oxide; lanthanum zirconate; thermal property; mechanical property; cycling; thermal durability

Citation Formats

Zhang, Jing. Novel Functionally Graded Thermal Barrier Coatings in Coal-Fired Power Plant Turbines. United States: N. p., 2016. Web. doi:10.2172/1369643.
Zhang, Jing. Novel Functionally Graded Thermal Barrier Coatings in Coal-Fired Power Plant Turbines. United States. https://doi.org/10.2172/1369643
Zhang, Jing. 2016. "Novel Functionally Graded Thermal Barrier Coatings in Coal-Fired Power Plant Turbines". United States. https://doi.org/10.2172/1369643. https://www.osti.gov/servlets/purl/1369643.
@article{osti_1369643,
title = {Novel Functionally Graded Thermal Barrier Coatings in Coal-Fired Power Plant Turbines},
author = {Zhang, Jing},
abstractNote = {This project presents a detailed investigation of a novel functionally graded coating material, pyrochlore oxide, for thermal barrier coating (TBC) in gas turbines used in coal-fired power plants. Thermal barrier coatings are refractory materials deposited on gas turbine components, which provide thermal protection for metallic components at operating conditions. The ultimate goal of this research is to develop a manufacturing process to produce the novel low thermal conductivity and high thermal stability pyrochlore oxide based coatings with improved high-temperature durability. The current standard TBC, yttria stabilized zirconia (YSZ), has service temperatures limited to <1200°C, due to sintering and phase transition at higher temperatures. In contrast, pyrochlore oxide, e.g., lanthanum zirconate (La2Zr2O7, LZ), has demonstrated lower thermal conductivity and better thermal stability, which are crucial to high temperature applications, such as gas turbines used in coal-fired power plants. Indiana University – Purdue University Indianapolis (IUPUI) has collaborated with Praxair Surface Technologies (PST), and Changwon National University in South Korea to perform the proposed research. The research findings are critical to the extension of current TBCs to a broader range of high-temperature materials and applications. Several tasks were originally proposed and accomplished, with additional new opportunities identified during the course of the project. In this report, a description of the project tasks, the main findings and conclusions are given. A list of publications and presentations resulted from this research is listed in the Appendix at the end of the report.},
doi = {10.2172/1369643},
url = {https://www.osti.gov/biblio/1369643}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 01 00:00:00 EDT 2016},
month = {Tue Nov 01 00:00:00 EDT 2016}
}