of the outer platform 25 comprises a platform surface 43 facing in axial direction a of the nozzle segment as indicated in fig3 likewise the shoulder 46 in the ring section 41 of the carrier ring 37 comprises a carrier ring surface 49 see fig3 also in axial direction a of the nozzle segment the carrier ring surface 49 and the platform surface 43 form first and second sealing surfaces respectively these first and second sealing surfaces 43 49 are aligned in a plane b plane b may be a plane perpendicular to the axis a the sealing element 70 of the present invention is shown in fig5 in a perspective view it comprises a leaf seal 71 and the impingement plate 75 mentioned above note that the impingement jet forming holes which are present in the impingement plate 75 are not shown in the figure both the impingement plate 75 and the leaf seal 71 are made from sheet metal and connected to each other by at least one connecting element which consists in the present embodiment of two hinge sections 73 that are made of a resilient bent sheet metal due to the hinge section 73 being resilient spring biasing the leaf seal 71 against the sealing surfaces 43 49 is possible note that the thickness the width and the number of the hinge sections 73 may be chosen so as to set a desired spring force and to reduce.