Turbine engine stator wall covered in an abradable coating
View Patent ↗An annular turbine engine stator portion including a structural support provided in succession with a bonding underlayer and with an abradable coating formed by a resin filled with microbeads, the bonding underlayer for fastening the abradable coating to the structural support being formed by fiber reinforcement made of long fibers having a peripheral portion of the reinforcement that is secured to the structural support and having a central portion thereof that is impregnated with the resin filled with microbeads while the abradable coating is being fastened to the structural support.
1. An annular turbine engine stator portion comprising: a structural support provided in succession with a bonding underlayer and with an abradable coating formed by a resin filled with microbeads, the bonding underlayer having a peripheral portion and a central portion and fastening the abradable coating to the structural support, the bonding underlayer formed of fiber reinforcement made of fibers, only the peripheral portion of the bonding underlayer secured to the structural support by adhesive bonding or by co-curing, the central portion of the bonding underlayer impregnated during deposition of said abradable coating.
2. An annular turbine engine stator portion according to claim 1 , wherein the fiber reinforcement comprises one or more juxtaposed plies of fiber fabric.
3. An annular turbine engine stator portion according to claim 2 , wherein the fiber reinforcement comprises a non-impregnated fabric ply of glass fibers or of any other fiber reinforcement.
4. An annular turbine engine stator portion according to claim 2 , wherein the fiber reinforcement comprises a plurality of plies that are pre-impregnated at least in part at their periphery with fabric of glass fibers or of any other fiber reinforcement.
5. An annular turbine engine stator portion according to claim 1 , wherein the structural support is based on a metal alloy, and the peripheral portion is adhesively bonded to the structural support by an epoxy resin.
6. An annular turbine engine stator portion according to claim 1 , wherein the structural support is based on composite material, and the peripheral portion is co-cured with the structural support while preparing the structural support.
7. An annular turbine engine stator portion according to claim 1 , wherein the resin filled with microbeads is a silicone resin or an epoxy resin.
8. An annular turbine engine stator portion according to claim 7 , wherein the microbeads are hollow beads of glass or of a refractory material.
9. An annular turbine engine stator portion according to claim 1 , wherein the abradable coating is fastened to the structural support by deposition by thermal spraying, by injection, by molding, or by spreading, to impregnate the fiber reinforcement and the structural support.
10. A turbine engine stator comprising a plurality of annular portions according to claim 1 .