FORMING A SURFACE LAYER OF A CERAMIC MATRIX COMPOSITE ARTICLE

摘要

The disclosure describes techniques for forming a surface layer of an article including a CMC using a cast. In some examples, the surface layer includes three-dimensional surface features, which may increase adhesion between the CMC and a coating on the CMC. In some examples, the surface layer may include excess material, with or without three-dimensional surface features, which is on the CMC. The excess material may be machined to remove some of the excess material and facilitate conforming the article to dimensional tolerances, e.g., for fitting the article to another component. The excess material may reduce a likelihood that the CMC (e.g., reinforcement material in the CMC) is damaged by the machining.

主权项

1. A method comprising:
depositing a slurry on a surface of an impregnated porous preform using a cast to form a surface layer including a plurality of three-dimensional surface features, wherein the cast defines the negative of the three-dimensional surface features, and wherein the impregnated porous preform comprises a reinforcement material and at least one matrix precursor; drying the slurry to form a greenbody preform; and infiltrating the greenbody preform with a molten infiltrant to form a composite article including the three-dimensional surface features.