Abstract
Interest in the integrated coal-gasification combined cycle plant (IGCC) has increased because of its high efficiency. However, degradation of gas turbine component materials has not been studied so far. Therefore, the purpose of this study is to investigate the corrosion behaviors of these materials in an actual coal gas combustion environment. Our test facility was constructed near the coal-gasification test facility (CGT) at the Aioi works of Ishikawajima-Harima Heavy Industries Co., Ltd. Several superalloy (René80H and FSX414) and coating systems (CoCrAlY, CoNiCrAlY and TBC) were exposed in the coal gas combustion environment at 1123, 1223 and 1323 K up to 350 h. After these tests, the weight change of each specimen was measured. Morphologies of products and element distributions at their surfaces were observed with SEM and EPMA. It is concluded that not only high- temperature oxidation and sulfidation but also ash deposition has a remarkable influence on the degradation of gas turbine blade materials.
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