Techniques for infiltrating a CMC substrate may include infiltrating the CMC substrate with a first slurry to at least partially fill at least some inner spaces of the CMC substrate, where the first slurry includes first solid particles, drying the first slurry to form an infiltrated CMC including the first solid particles, depositing a second slurry including a carrier material and second solid particles on a surface of the infiltrated CMC, where the second solid particles include a plurality of fine ceramic particles, a plurality of coarse ceramic particles, and a plurality of diamond particles, drying the second slurry to form an article having an outer surface layer including the second solid particles on the infiltrated CMC, and infiltrating the article with a molten infiltrant to form a composite article.

An environmental barrier coating, comprising an environmental barrier coating applied to a substrate containing silicon; the environmental barrier coating comprising an oxide matrix surrounding a fiber-reinforcement structure and a self-healing phase interspersed throughout the oxide matrix.

An environmental barrier coating, comprising an environmental barrier coating applied to a substrate containing silicon; the environmental barrier coating comprising an oxide matrix surrounding a fiber-reinforcement structure and a self-healing phase interspersed throughout the oxide matrix.

A method for reinforcing a structure comprising the following steps: preparation of UHPFRC comprising a cement precursor mix, of water, a fluidizing agent and metal fibers, transporting the UHPFRC by pumping to a suitable spray nozzle, spraying the mix onto a surface of the structure by the addition of a compressed air stream in the spray nozzle.

A method for reinforcing a structure comprising the following steps: preparation of UHPFRC comprising a cement precursor mix, of water, a fluidizing agent and metal fibers, transporting the UHPFRC by pumping to a suitable spray nozzle, spraying the mix onto a surface of the structure by the addition of a compressed air stream in the spray nozzle.

A laminated cermet tool material with self generated micro texture on the surface and a preparation method thereof; first, the tungsten carbide titanium matrix powder is added with molybdenum cobalt nickel rare metal as the bonding phase to form the matrix, then 2.5D braided ceramic fiber preforms are placed on the upper and lower surfaces of the cermet matrix powder, and the laminated cermet tool material with self generated micro texture on the surface is obtained by spark plasma sintering, as the ceramic fiber braid is braided, it has a stable structure, realizing the formation of texture coating on the surface of the tool, and the laminated tool with the cermet as the middle layer.

A laminated cermet tool material with self generated micro texture on the surface and a preparation method thereof; first, the tungsten carbide titanium matrix powder is added with molybdenum cobalt nickel rare metal as the bonding phase to form the matrix, then 2.5D braided ceramic fiber preforms are placed on the upper and lower surfaces of the cermet matrix powder, and the laminated cermet tool material with self generated micro texture on the surface is obtained by spark plasma sintering, as the ceramic fiber braid is braided, it has a stable structure, realizing the formation of texture coating on the surface of the tool, and the laminated tool with the cermet as the middle layer.

A method for treating at least one silicon carbide fibre includes a surface layer including carbon and/or a silicon oxycarbide, the treatment including at least removing the surface layer from the fibre by placing in contact with an ammonia phase in the supercritical state.

A method for treating at least one silicon carbide fibre includes a surface layer including carbon and/or a silicon oxycarbide, the treatment including at least removing the surface layer from the fibre by placing in contact with an ammonia phase in the supercritical state.

A fiber comprises a bulk material comprising one or more materials selected from the group consisting of carbon, silicon, boron, silicon carbide, and boron nitride; and a metal whose affinity for oxygen is greater than the affinity for oxygen of any of the one or more materials. The metal may be selected from the group consisting of beryllium, titanium, hafnium and zirconium. At least a first portion of the metal may be present in un-oxidized form at the entrance to and/or within grain boundaries within the fiber.

A method of improving at least one of the strength, creep resistance, and toughness of a fiber comprises adding to a fiber, initially comprising a bulk material having a first affinity for oxygen, a metal that has a second affinity for oxygen higher than the first affinity. The metal may be selected from the group consisting of beryllium, titanium, hafnium and zirconium.