Composite components and methods for preventing flow from infiltrated component during re-infiltration

A method for modifying a ceramic matrix composite (CMC) component, comprising:

• positioning a barrier segment between an infiltrated segment of the CMC component and a green segment, wherein a particle size distribution varies from the barrier segment to the green segment;
• positioning a source of silicon in contact with the green segment;
• and
• initiating a melt infiltration process,
• wherein the barrier segment has a reactive permeability lower than a reactive permeability of the infiltrated segment, a reactive permeability of the green segment, or both the reactive permeability of the infiltrated segment and the reactive permeability of the green segment.

A method for modifying a composite component, comprising:

• positioning a barrier segment between an infiltrated segment of the composite component and a green segment to form an assembly, wherein the green segment comprises the barrier segment;
• and
• initiating an infiltration process,
• wherein the barrier segment has a barrier segment permeability that is lower than an infiltrated segment permeability of the infiltrated segment, a green segment permeability of the green segment, or both the infiltrated segment permeability and the green segment permeability.

A method for modifying a composite component, comprising:

• positioning a barrier segment between an infiltrated segment of the composite component and a green segment to form an assembly;
• and
• initiating an infiltration process,
• wherein the barrier segment has a barrier segment permeability that is lower than an infiltrated segment permeability of the infiltrated segment, a green segment permeability of the green segment, or both the infiltrated segment permeability and the green segment permeability, and wherein the barrier segment permeability is a reactive permeability such that the barrier segment permeability is lower when the barrier segment reacts during the infiltration process.

A method for modifying a composite component, comprising:

• identifying an area of unwanted material in an infiltrated segment;
• removing the area of unwanted material;
• thereafter, positioning a barrier segment between the infiltrated segment of the composite component and a green segment to form an assembly;
• and
• initiating an infiltration process,
• wherein the barrier segment has a barrier segment permeability that is lower than an infiltrated segment permeability of the infiltrated segment, a green segment permeability of the green segment, or both the infiltrated segment permeability and the green segment permeability.

A method for modifying a composite component, comprising:

• forming a green segment from a first plurality of composite plies;
• forming a barrier segment from a second plurality of composite plies;
• positioning the barrier segment between an infiltrated segment of the composite component and the green segment to form an assembly;
• and
• initiating an infiltration process,
• wherein the barrier segment has a barrier segment permeability that is lower than an infiltrated segment permeability of the infiltrated segment, a green segment permeability of the green segment, or both the infiltrated segment permeability and the green segment permeability.