and University of Dayton Research Institute (UDRI) in support of the program with Solar Turbines.
ceramic components for use in industrial gas turbines. The program was designed to bring ceramic technology to the point where short-term reliability and engine performance have been demonstrated.
DOE-OIT selected Solar Turbines Incorporated for the development of ceramic gas turbine components. Solar Turbines started work in late FY 1992. One of the critical areas outlined in their program was a long-term materials testing program. Long-term materials tests are needed to determine the survivability of the materials for land-based applications. This section outlines the long-term testing conducted at Oak Ridge National Laboratory (ORNL) and University of Dayton Research Institute (UDRI) in support of the program with Solar Turbines.
Research activities on this project focus on the evaluation of the static tensile creep and stress rupture (SR) behavior of three commercially available structural ceramics which have been identified by the gas turbine manufacturers as leading candidates for use in industrial gas turbines. Tensile creep data are being generated in air by measuring creep strain as a function of time, applied stress, and temperature. The SR resistance is being evaluated by continuing each creep test until the specimen fails. For each material investigated, a minimum of three temperatures and four stresses are being used to establish the stress and temperature sensitivities of the creep and SR behavior. The test matrix utilized in this program is intended to extend the test conditions investigated by the engine component manufacturers. Because existing data for many candidate structural ceramics are limited to testing times less than 2,000 h, this program is focused on extending these data to times on the order of 10,000 h, which represents the lower limit of operating time anticipated for ceramic blades and vanes in gas turbine engines.
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