Resilient mounting apparatus for low-ductility turbine shroud

A turbine shroud apparatus for a gas turbine engine, comprising:

• a plurality of arcuate shroud segments arranged to form an annular shroud, each of the shroud segments comprising low-ductility material and having a cross-sectional shape defined by opposed forward and aft walls, and opposed inner and outer walls, the walls extending between opposed first and second end faces;
• an annular turbine case surrounding the shroud segments, the turbine case including a bearing surface which bears against the shroud segments, so as to restrain the shroud segments from axial movement in a first direction;
• an annular nozzle support mounted to the turbine case and positioned on an axially opposite side of the shroud segments from the bearing surface, the nozzle support defining a radially-outward facing seal slot;
• a piston ring disposed in the seal slot and extending radially outward so as to contact an inner surface of the turbine case;
• and
• a spring element disposed between the nozzle support and the shroud segments which resiliently urges the shroud segments in the first direction against the bearing surface.