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The development of a 300kW-class recuperative ceramic gas turbine (CGT301) for continuous load has been conducted by the New Energy and Industrial Technology Development Organization (NEDO) as one of the programs in the Moonlight Project. In this program, the development of a ceramic heat exchanger has been carried out under the cooperation of Ishikawajima-Harima Heavy Industries, Ltd. (IHI) and NGK Insulators, Ltd. (NGK). since 1988. In this paper, the process of the development of the ceramic heat exchanger is described. A three pass shell-and-tube type of heat exchanger is considered. As the heat exchanger is to be operated at gas temperature over 825°C, the reliability is expected to be improved by applying high-temperature resistant silicon-nitride ceramics to its hot tube-bundle. In consideration of the limitation in the size of the ceramic tube-bundle, the heat exchanger was designed as the assembly of six identical modules. Tests of a single module with ceramic tube-bundle were conducted. It was confirmed that the ceramic tube-bundle had reasonable structural reliability, and that the module gave a sufficient performance i.e., temperature effectiveness and pressure drop characteristics.

NGK Insulators, Ltd. (NGK) has undertaken the research and development on the fabrication processes of high-heat-resistant ceramic components for the CGT301, which is a 300kW recuperative industrial ceramic gas turbine engine. This program is under the New Sunshine Project, funded by the Ministry of International Trade and Industry (MITI), and has been guided by the Agency of Industrial Science & Technology (AIST) since 1988. The New Energy and Industrial Technology Development Organization (NEDO) is the main contractor. The fabrication techniques for ceramic components, such as turbine blades, turbine nozzles, combustor liners, gas-path parts, and heat exchanger elements, for the 1,200°C engine were developed by 1993. Development for the 1,350°C engine has been underway since 1994. The baseline conditions for fabricating of all ceramic components have been established. This paper reports on the development of ceramic gas turbine components, and the improved accuracies of their shapes as well as improved reliability from the results of the interim appraisal conducted in 1994.

Development of ceramic components for a 300kW recuperative single-shaft ceramic gas turbine, a program in the Moonlight Projects, is being conducted by the New Energy and Industrial Organization (NEDO). Along with its program, NGK has made technical efforts in cooperation with Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI) since 1988. In this paper, the strength of the NGK silicon nitride turbine blade is discussed. Bending strength was checked with specimens cut from the turbine blades, and specifically, cold spin tests were conducted with ceramic turbine blades having three configurations. The silicon nitride was found promising for ceramic gas turbine applications, however, there are some issues to be solved prior to prototype engine tests.