Papers by Keyword: Erosion Test

Abstract: Since 2004, Mitsubishi has been pursuing a 1,700°C gas turbine as part of the Japanese National Project [1][2]. One of the most important key technologies for the target is thermal barrier coatings (TBCs) which are capable of improving cooling efficiency of hot parts. With increasing the turbine inlet temperature, TBCs surface temperature is also rising up. In addition, the temperature gradient through TBCs thickness must steepen as a result of keeping metal temperature. Both have a significant effect on durability such as spallation and erosion of TBCs. To evaluate these issues, thermal cycle test and hot erosion test were introduced. After the screening of those component tests, the advanced TBCs coated in the first unit of M501J were verified at our pilot plant called T-point. Sound condition for row 1 blades and vanes had been confirmed after over 3 year operation.

Abstract: In this investigation, AA 2618 is taken as the matrix material and Si₃N₄ (Silicon Nitride), AlN (Aluminium Nitride) and ZrB₂ (Zirconium Boride) are taken as the reinforcement material. The reinforcements are mixed with the matrix in various X weight percentages (wt %) (X=0, 2, 4, 6, 8) by stir casting method. According to the ASTM standard AA 2618 composites were prepared with various wt % to find the mass loss in erosion test. The samples were imposed with various input conditions to obtain minimum mass loss for AA 2618 composites. Taguchi method was used to find the maximum influenced process parameter for mass loss and ANOVA (Analysis of Variance) method was adopted for finding the percentage of contribution of each process parameters