ウォータージェットを用いたセラミックス溶射皮膜のはく離除去技術の評価

抄録

Thermal Barrier Coating (TBC) is applied to gas turbine. The TBC is removed and re-coated by thermal spray when it is repaired periodically. If the Yttria Stabilized Zirconia (YSZ) can be re-coated by thermal spray after removing the top coating by using an environment-friendly water jet treatment to repair TBC, it can become very useful repairing method. In order to re-coat the YSZ on the bond coating by thermal spray after removing only the top coating of TBC, we compared the validity of water jet treatment with that of blast treatment. The results are as follows. (1) The surface roughnesses of the bond coatings after removing only the top coating both by water jet treatment and blast treatment are the range of the roughness that can get good adhesive strength. (2) Water jet treatment has more properties than blast treatment in the case of the working time and the influence on the environment. (3) From the above things, water jet treatment is effective to re-coat the top coating by thermal spray.