초록 ▼

A method for producing apertures in hot section components of gas turbine engines made from ceramic matrix composites that have at least one oxidizable component. The method involves forming the apertures using a laser beam controlled by parameters that ablate the ceramic matrix composite in the pat

A method for producing apertures in hot section components of gas turbine engines made from ceramic matrix composites that have at least one oxidizable component. The method involves forming the apertures using a laser beam controlled by parameters that ablate the ceramic matrix composite in the path of the beam, while simultaneously heating the matrix material, SiC or SiN, to a sufficient temperature to oxidize it to form a silica. Sufficient heat is supplied by the beam to melt the silica to cause it to flow. The melted silica is quickly solidified as recast silica along the walls of the newly created aperture before it has an opportunity to flow and form undesirable geometries. The wall of the aperture is formed of recast silica that is a smooth surface and that forms an oxidation barrier to inhibit any further oxidation of the underlying composite as it is exposed to the high temperatures and oxidative, corrosive atmosphere of an operating gas turbine.

대표청구항 ▼

1. A method for producing an aperture in a ceramic matrix composite component having at least one oxidizable component, comprising the steps of:applying a laser beam to the ceramic matrix composite material; ablating the material of the ceramic matrix composite to produce an aperture while substanti

1. A method for producing an aperture in a ceramic matrix composite component having at least one oxidizable component, comprising the steps of:applying a laser beam to the ceramic matrix composite material; ablating the material of the ceramic matrix composite to produce an aperture while substantially simultaneously oxidizing and melting at least a portion of the material adjacent to the beam along a surface wall of the aperture; and recasting the melted, oxidized material along the aperture surface to form a continuous oxidation barrier.