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Widening the usability of yttria stabilised zirconia by advanced cooling technology
Author(s) -
Lugscheider E.,
Bobzin K.,
Etzkorn A.
Publication year - 2001
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/1521-4052(200108)32:8<660::aid-mawe660>3.0.co;2-g
Subject(s) - thermal barrier coating , materials science , coating , sintering , cubic zirconia , yttria stabilized zirconia , gas turbines , composite material , mechanical engineering , ceramic , engineering
The use of yttria stabilised zirconia as thermal barrier material for gas turbine applications is limited because of sintering effects within the coating at high temperatures. The sintering of the coating is accompanied by a deterioration of the mechanical properties which leads to a reduction in coating function, lifetime and reliability. Many research work is ongoing to develop new materials for thermal barrier applications with better sintering resistance. Another way to face the problem is the improvement of the gas turbine cooling technology. Because of the very good property mixture of yttria partial stabilised zirconia (low thermal conductivity, high thermal expansion, low young's modulus, established processes, availability …) this is a very promising way. Transpiration cooling shows a high potential for the temperature reduction at constant efficiency. The presentation shows some new aspects of coating technology caused by changed surface conditions of transpiration cooled surfaces as they are subject in the collaborative research center (SFB) 561 “Thermally highly loaded porous and cooled multilayer systems for combined cycle power plants”.