US 12,228,033 B1
Blade outer air seal with machinable coating at sealing surfaces
Joseph Micucci, Scarborough, ME (US); Daniel S. Rogers, Lyman, ME (US); Mikayla M. Rogers, Portland, ME (US); Danielle Mahoney, Granby, CT (US); and Carson A. Roy Thill, Buxton, ME (US)
Assigned to RTX Corporation, Farmington, CT (US)
Filed by RTX CORPORATION, Farmington, CT (US)
Filed on Oct. 13, 2023, as Appl. No. 18/486,793.
Int. Cl. F01D 11/08 (2006.01); F01D 11/00 (2006.01); F01D 25/00 (2006.01); F01D 25/28 (2006.01)
CPC F01D 11/08 (2013.01) [F01D 11/005 (2013.01); F01D 25/005 (2013.01); F01D 25/28 (2013.01); F05D 2230/90 (2013.01); F05D 2260/38 (2013.01); F05D 2300/6033 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A gas turbine engine comprising:
a compressor section;
a combustor section; and
a turbine section for rotation on an axis, the turbine section including at least one row of rotating turbine blades each having a radially outer tip; and
a blade outer air seal positioned radially outwardly of the radially outer tip, the blade outer air seal formed of ceramic matrix composite materials, the blade outer air seal having a central web positioned radially outwardly of the radially outer tip;
the blade outer air seal having an upstream mount arm and a downstream mount arm mounted to a static structure, the static structure having respective sealing members each engaging a respective upstream outer surface of the upstream mount arm at an upstream seal material and a respective downstream outer surface of the downstream mount arm at a downstream seal material, at least one of the upstream seal material and the downstream seal material being formed of a bond layer deposited on the mount arm, and a seal layer deposited on the bond layer;
a seal thickness in an axial direction defined for the combination of the bond layer and the seal layer at a contact location with a respective one of the sealing members; and
a mount arm width of a respective one of the upstream mount arm and downstream mount arm associated with the at least one of the upstream seal material and downstream seal material has a width at a radial location of the contact location and a ratio of the seal thickness to the mount arm width is greater than or equal to 0.4 and less than or equal to 0.8.