Components and methods for forming the components are provided that promote adherence of environmental barrier coatings to surfaces of the components. The components include a substrate formed of a SiCSiC composite that includes boron, a surface of the substrate that has a concentration of the boron that is reduced relative to a remainder of the substrate, and an environmental barrier coating disposed on the surface of the substrate. The methods include providing the SiCSiC composite, performing a pretreatment process on a portion of the surface of the component to reduce the concentration of the boron at the surface, and forming the environmental barrier coating on the surface.

The present application relates to the field of engineering ceramic materials, and specifically discloses a solid-phase-sintered silicon carbide article and a preparation method thereof. A method for preparing a solid-phase-sintered silicon carbide article includes the following steps: grinding of raw materials: mixing a micron-scale silicon carbide powder with a boron-containing sintering aid and wet grinding to obtain a slurry; spray granulating: adding a water-soluble carbon black and a binder to the slurry, stirring evenly, and spray granulating to obtain a granulated powder of silicon carbide; mixing; ageing: ageing the wet powder obtained by mixing to obtain a aged material; post-processing: subjecting the aged material to pugging, extruding, drying and heating.

A method is provided for densifying a ceramic matrix composite (CMC) preform in which a porous CMC preform is subjected to slurry infiltration wherein metal carbide particulate material is introduced into the spaces between fiber tows of the CMC preform to form an infiltrated CMC preform. Thereafter, molten metal or molten metal alloy is introduced into the infiltrated CMC preform by melt infiltration to react the metal or molten metal alloy with the metal carbide particulate material and create a ceramic matrix within the CMC preform forming a ceramic matrix composite. The metal carbide particulate material is selected from zirconium carbide particles, hafnium carbide particles, tantalum carbide particles, niobium carbide particles, titanium carbide particles, tungsten carbide particles, cobalt carbide particles, vanadium carbide particles, chromium carbide particles, ytterbium carbide particles, yttrium carbide particles, tantalum hafnium carbide particles, and mixtures thereof.