A method for modifying a ceramic matrix composite component comprising: identifying a non-conforming region of the ceramic matrix composite component capable of operating in a gas turbine engine; removing at least a portion of the non-conforming region of the ceramic matrix composite component to create an exposed surface of the ceramic matrix composite component; preparing a preform in response to the removing at least a portion of the non-conforming region, wherein the preform is configured to replace the removed portion of the non-conforming region; applying a reactive constituent surface region on at least one of the exposed surface of the ceramic matrix composite component or a surface of the preform, the reactive constituent surface region comprising a first constituent and a second constituent being capable of producing a thermodynamic non-equilibrium condition between the first constituent and the second constituent, wherein a self-propagating reaction of the first constituent and the second constituent is capable of driving the thermodynamic non-equilibrium condition toward a thermodynamic equilibrium condition, wherein applying the reactive constituent surface region on the at least one of the exposed surface of the ceramic matrix composite component or the surface of the preform comprises: applying a first plurality of layers of the first constituent and the second constituent on the exposed surface of the ceramic matrix composite component to form a first outer coating, wherein the first outer coating includes the first constituent; and applying a second plurality of layers of the first constituent and the second constituent on the surface of the preform to form a second outer coating, wherein the second outer coating includes the second constituent; positioning the preform to provide a contact region between the exposed surface of the ceramic matrix composite component and the preform, wherein the reactive constituent surface region is positioned between the ceramic matrix composite component and the preform; and reacting the reactive constituent surface region in a self-propagating reaction at the contact region to form a bond structure between the exposed surface of the ceramic matrix composite component and the preform. identifying a non-conforming region of the ceramic matrix composite component capable of operating in a gas turbine engine; removing at least a portion of the non-conforming region of the ceramic matrix composite component to create an exposed surface of the ceramic matrix composite component; preparing a preform in response to the removing at least a portion of the non-conforming region, wherein the preform is configured to replace the removed portion of the non-conforming region; applying a reactive constituent surface region on at least one of the exposed surface of the ceramic matrix composite component or a surface of the preform, the reactive constituent surface region comprising a first constituent and a second constituent being capable of producing a thermodynamic non-equilibrium condition between the first constituent and the second constituent, wherein a self-propagating reaction of the first constituent and the second constituent is capable of driving the thermodynamic non-equilibrium condition toward a thermodynamic equilibrium condition, wherein applying the reactive constituent surface region on the at least one of the exposed surface of the ceramic matrix composite component or the surface of the preform comprises: applying a first plurality of layers of the first constituent and the second constituent on the exposed surface of the ceramic matrix composite component to form a first outer coating, wherein the first outer coating includes the first constituent; and applying a second plurality of layers of the first constituent and the second constituent on the surface of the preform to form a second outer coating, wherein the second outer coating includes the second constituent; positioning the preform to provide a contact region between the exposed surface of the ceramic matrix composite component and the preform, wherein the reactive constituent surface region is positioned between the ceramic matrix composite component and the preform; and reacting the reactive constituent surface region in a self-propagating reaction at the contact region to form a bond structure between the exposed surface of the ceramic matrix composite component and the preform. applying a first plurality of layers of the first constituent and the second constituent on the exposed surface of the ceramic matrix composite component to form a first outer coating, wherein the first outer coating includes the first constituent; and applying a second plurality of layers of the first constituent and the second constituent on the surface of the preform to form a second outer coating, wherein the second outer coating includes the second constituent; positioning the preform to provide a contact region between the exposed surface of the ceramic matrix composite component and the preform, wherein the reactive constituent surface region is positioned between the ceramic matrix composite component and the preform; and reacting the reactive constituent surface region in a self-propagating reaction at the contact region to form a bond structure between the exposed surface of the ceramic matrix composite component and the preform.