Ceramic matrix composite turbine components

A turbine component for use in a hot section of a gas turbine engine comprising:

• a ceramic matrix composite material further comprising reinforcing fibers in a ceramic matrix, in which the ceramic matrix material in a silicon based material and the reinforcing fibers are selected from the group consisting of ceramic fibers, glass fibers, organic fibers, metallic fibers, and combinations thereof;
• and
• at least one aperture formed in the ceramic matrix composite, the at least one aperture having walls formed in the ceramic matrix composite, the walls of the at least one aperture being a substantially smooth, continuous, recast layer of silica that forms an oxidation barrier to protect the underlying CMC material from high temperature oxidation, the at least one aperture being formed by laser drilling and the recast layer being formed as laser energy melts the material adjacent to the at least one aperture and pressurized from the laser nozzle resolidifies the melted CMC as recast silica.

A turbine component for use in a hot section of a gas turbine engine comprising:

• a ceramic matrix composite material further comprising reinforcing fibers in a ceramic matrix, in which the ceramic matrix material is a silicon based material and the reinforcing fibers are selected from a group consisting of ceramic fibers, metallic fibers, and combinations thereof;
• and
• at least one aperture formed in the ceramic matrix composite, the at least one aperture having a pre-selected cross-sectional area having a wall formed in the ceramic matrix composite, the at least one aperture having a centerline vector that is up to 70° from normal to the turbine component surface, the wall of the at least one aperture being substantially smooth, continuous, recast layer of silica that forms an oxidation barrier to protect the underlying CMC material from high temperature oxidation, the at least one aperture being formed by laser drilling and the recast layer being formed as laser energy melts the material adjacent to the aperture and pressurized air from the laser nozzle resolidifies the melted CMC as recast silica.