skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Advanced ceramics for land-based gas turbine applications. Final report

Abstract

In order to increase the efficiency of land-based gas turbines, inlet gas temperatures have to be increased, and the amount of air which cools the turbine vanes has to be reduced, to the maximum extent possible. Presently, thermal barrier coatings (TBC`s) are the state of the art in achieving these goals. However, since TBC`s are very thin (typically 100 {mu}m), they have clearly limitations. Since all-ceramic turbine vanes would be a very large and risky development step, Westinghouse is considering to protect the leading edges of turbine vanes with high-performance ceramics. This might be done by either replacing the leading edge with a suitably shaped ceramic part, or by modifying the vanes such that they can accommodate ceramic inserts. Among the most important criteria for the success of ceramics in such applications are (a) thermodynamic compatibility with the turbine vane alloy, (b) sufficient thermal shock resistance to survive the thermal cycling during operation and in particular during emergency shut-down, and a design considering the thermal expansion mismatch of the metallic and ceramic components. This paper presents results of work performed on SiC, SiN, and aluminas.

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
508149
Report Number(s):
ORNL/M-5934
ON: DE97008103; CRN: C/ORNL--94-0287; TRN: 97:004676
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 23 May 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 33 ADVANCED PROPULSION SYSTEMS; SILICON NITRIDES; THERMAL CYCLING; MECHANICAL PROPERTIES; SILICON CARBIDES; ALUMINIUM OXIDES; CERAMICS; COATINGS; COMPATIBILITY; GAS TURBINES; THERMAL EXPANSION; THERMAL SHOCK; VANES

Citation Formats

Schneibel, J.H., Ludeman, E., and Sabol, S.M. Advanced ceramics for land-based gas turbine applications. Final report. United States: N. p., 1997. Web. doi:10.2172/508149.
Schneibel, J.H., Ludeman, E., & Sabol, S.M. Advanced ceramics for land-based gas turbine applications. Final report. United States. doi:10.2172/508149.
Schneibel, J.H., Ludeman, E., and Sabol, S.M. Fri . "Advanced ceramics for land-based gas turbine applications. Final report". United States. doi:10.2172/508149. https://www.osti.gov/servlets/purl/508149.
@article{osti_508149,
title = {Advanced ceramics for land-based gas turbine applications. Final report},
author = {Schneibel, J.H. and Ludeman, E. and Sabol, S.M.},
abstractNote = {In order to increase the efficiency of land-based gas turbines, inlet gas temperatures have to be increased, and the amount of air which cools the turbine vanes has to be reduced, to the maximum extent possible. Presently, thermal barrier coatings (TBC`s) are the state of the art in achieving these goals. However, since TBC`s are very thin (typically 100 {mu}m), they have clearly limitations. Since all-ceramic turbine vanes would be a very large and risky development step, Westinghouse is considering to protect the leading edges of turbine vanes with high-performance ceramics. This might be done by either replacing the leading edge with a suitably shaped ceramic part, or by modifying the vanes such that they can accommodate ceramic inserts. Among the most important criteria for the success of ceramics in such applications are (a) thermodynamic compatibility with the turbine vane alloy, (b) sufficient thermal shock resistance to survive the thermal cycling during operation and in particular during emergency shut-down, and a design considering the thermal expansion mismatch of the metallic and ceramic components. This paper presents results of work performed on SiC, SiN, and aluminas.},
doi = {10.2172/508149},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 23 00:00:00 EDT 1997},
month = {Fri May 23 00:00:00 EDT 1997}
}

Technical Report:

Save / Share: