The invention relates to a turbine ring assembly for a gas turbine, that comprises a full ring (10) made of a single piece and of a composite material having a ceramic matrix, a metal structure for holding the CMC ring including metal annular holders (20, 30) between which the CMC ring is provided while allowing for a differential expansion at least in the radial direction between the CMC ring and the annular holders, a means (40-42) for centring the CMC ring, and at least one member for rotatingly blocking the CMC ring about the axis thereof.

Turbine ring assembly for gas turbine

In order to protect a substrate having at least a portion adjacent to a surface that is made of a refractory material containing silicon, while the substrate is in use at high temperature in a medium that is oxidizing and wet, there is formed on the surface of the substrate an environmental barrier that contains no boron and that has at least one layer that is essentially constituted by a system of oxides formed by at least one rare earth oxide, silica, and alumina, and that is capable of self-healing by maintaining the presence of at least one solid phase in a temperature range extending up to at least 1400° C. approximately.

Environmental barrier for a refractory substrate containing silicon

A composite material includes a ceramic matrix and two different fractions of fiber bundles, namely a reinforcing fiber bundle fraction and a matrix fiber bundle fraction having different average fiber bundle lengths. The fractions of fiber bundles are separated in a total fiber bundle distribution relative to a fiber bundle length by a minimum. A method for manufacturing a composite material and a method for manufacturing elements formed of a composite material are also provided.

Fiber-bundle-reinforced composite material having a ceramic matrix, method for manufacturing a composite material and method for manufacturing elements formed of a composite material

The invention relates to a method for smoothing a corrugated, rough surface of a part made from a ceramic matrix composite material. According to the invention, a ceramic coating is formed on the surface of the part by means of the following steps, namely: application (20) of a liquid composition on the surface of the part, said composition containing a ceramic precursor polymer and a solid refractory filler; crosslinking (40) of the polymer; and conversion (50) of the crosslinked polymer into ceramic by means of heat treatment. The method also includes the impregnation of the ceramic coating with a liquid metal composition (60).

Method for smoothing the surface of a part made from a cmc material

A method and apparatus for forming a plurality of fibers from (e.g., CVD) precursors, including a reactor adapted to grow a plurality of individual fibers; and a plurality of independently controllable lasers, each laser of the plurality of lasers growing a respective fiber. A high performance fiber (HPF) structure, including a plurality of fibers arranged in the structure; a matrix disposed between the fibers; wherein a multilayer coating is provided along the surfaces of at least some of the fibers with an inner layer region having a sheet-like strength; and an outer layer region, having a particle-like strength, such that any cracks propagating toward the outer layer from the matrix propagate along the outer layer and back into the matrix, thereby preventing the cracks from approaching the fibers. A method of forming an interphase in a ceramic matrix composite material having a plurality of SiC fibers, which maximizes toughness by minimizing fiber to fiber bridging, including arranging a plurality of SiC fibers into a preform; selectively removing (e.g., etching) silicon out of the surface of the fibers resulting in a porous carbon layer on the fibers; and replacing the porous carbon layer with an interphase layer (e.g., Boron Nitride), which coats the fibers to thereby minimize fiber to fiber bridging in the preform.

/pdf/high-strength-ceramic-fibers-and-methods-of-fabrication-1703ndbju3.pdf

High strength ceramic fibers and methods of fabrication

The material consists of a textile reinforcement of fibers made up essentially of silicon carbide, and an interphase layer between the reinforcing fibers and the matrix. The reinforcing fibers are long fibers which contain less than 5 % at. of residual oxygen and have a modulus higher than 250 GPa, the interphase layer is strongly bound to the fibers and to the matrix such that the shearing strength inside the interphase layer and at the fiber-interphase and interphase-matrix is greater than that inside the matrix.

Composite material with ceramic matrix and sic fiber reinforcement, method for making same

A dry pump (32) has an input connected to the furnace (10) for establishing, inside the oven, conditions desired low pressure, and extracting the residual gas, a hydrolysis reactor (50 ) is connected to an outlet of the dry pump for receiving residual gas from the oven, the hydrolysis reactor having a first outlet (52) for solid deposits or acid solutions coming from hydrolysis of the received gas and a second output gas (54) connected to the atmosphere. Gas injection means (46, 48) between the inlet of the dry pump (32) and the hydrolysis reactor (50) avoid a cons-stream from the hydrolysis reactor towards the pump. water supply means (74, 76) are connected to the hydrolysis reactor (50) at least through the second outlet (54) thereof in order to acid fumes solution from the hydrolysis reactor and prevent their release into the atmosphere.

An extraction device for gas infiltration or chemical vapor deposition oven phase in a manufacturing facility of composite material parts

Le materiau comprend un renfort fibreux en fibres constituees essentiellement de carbure de silicium, et une couche d'interphase entre les fibres du renfort et la matrice. Les fibres de renfort sont des fibres longues qui contiennent moins de 5 % at. d'oxygene residuel et ont un module superieur a 250 GPa, et la couche d'interphase est fortement liee aux fibres et a la matrice de sorte que les resistances a la rupture par cisaillement au sein de la couche d'interphase et au niveau des liaisons fibres-interphase et interphase-matrice sont superieures a celles rencontrees au sein de la matrice.

Jean Luc Charvet

Papers

Composite material with ceramic matrix and sic fiber reinforcement, method for making same

An extraction device for gas infiltration or chemical vapor deposition oven phase in a manufacturing facility of composite material parts

MATERIAU COMPOSITE A MATRICE CERAMIQUE ET RENFORT EN FIBRES SiC ET PROCEDE POUR SA FABRICATION