Thermal expansion can cause turbine blade rub or air leakage; a thrust bearing lets the shroud adapt axially to preserve clearance.
Magnetic biasing helps turbine-engine seal segments maintain radial clearance from the rotor, limiting scrub and wear during pressure changes.
A secondary strip seal shields the primary seal from hot gases and pressure loads, while damping limits flutter and leakage.
Controlled sintering of micrometric ceramic particles creates porous abradable layers that balance turbine blade wear and erosion resistance.