Technology assessment of ceramic joining applicable to heat exchangers. Technical planning study TPS-77-748. Final report
The use of metal heat exchangers for heat recovery in utility combined-cycle and indirect-fired gas turbine power plants is limited to a maximum temperature range of 800 to 900/sup 0/C. The use of ceramic heat exchangers offers the potential of higher operating temperatures and thus a higher efficiency. Joining ceramics was identified as a potential problem; this study confirms that the present state of the art of joining ceramics must be improved to obtain the full benefits of high-temperature ceramic heat exchangers. Mechanical joining, brazing, and solid-state bonding appear to be the most promising methods. Mechanical joining is limited to application with low applied stresses. Brazing, mainly using silicon metal, limits the maximum temperature to 1200 to 1300/sup 0/C. Solid-state bonding requires a high sintering temperature and is difficult to do under field conditions.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6886869
- Report Number(s):
- EPRI-AP-1586
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
CERAMICS
JOINING
COMBINED-CYCLE POWER PLANTS
HEAT EXCHANGERS
GAS TURBINE POWER PLANTS
FABRICATION
BONDING
BRAZING
FOSSIL-FUEL POWER PLANTS
TUBES
VERY HIGH TEMPERATURE
POWER PLANTS
THERMAL POWER PLANTS
WELDING
200104* - Fossil-Fueled Power Plants- Components
200102 - Fossil-Fueled Power Plants- Power Cycles
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication