A portable optical device, for an in-shop integrity assessment of gas turbines ceramic coatings, is described. The main features of the optical scheme are reported together with the description of the miniaturised probe shaped to extend the PLPS detection also at the leading edge. Measurements performed both on specimens aged in laboratory conditions and on operated components are presented and compared with the initial condition. The important meaning of the obtained results is shown with the help of metallographic analyses performed on sections of specimens and components. Finally limits and future perspective of the technique are evidenced.
展开▼
