Methods for preparing ceramic matrix composites using melt infiltration are provided as well as the resulting ceramic matrix composites. The methods and products include the incorporation of a non-wetting coating to one or more sacrificial fibers. The one or more sacrificial fibers are removed, such as decomposed during pyrolysis, resulting in the formation of a plurality of functional features, in the form of regular and elongate channels along the ceramic matrix composite. During the removing of the one or more sacrificial fibers, the non-wetting coating remains on an interior surface of the plurality of functional features to block infiltration of an infiltrant to the plurality of functional features and deposition thereon. Alternatively, the sacrificial fibers may be removed subsequent to melt infiltration.

Methods for preparing ceramic matrix composites using melt infiltration are provided as well as the resulting ceramic matrix composites. The methods and products include the incorporation of a non-wetting coating to one or more sacrificial fibers. The one or more sacrificial fibers are removed, such as decomposed during pyrolysis, resulting in the formation of a plurality of functional features, in the form of regular and elongate channels along the ceramic matrix composite. During the removing of the one or more sacrificial fibers, the non-wetting coating remains on an interior surface of the plurality of functional features to block infiltration of an infiltrant to the plurality of functional features and deposition thereon. Alternatively, the sacrificial fibers may be removed subsequent to melt infiltration.

An ink formulation for additive manufacturing of low density syntactic foams is described. The ink formulation can include a thermoset resin, a curing agent suitable for use with the thermoset resin, a plurality of hollow spheres, such as glass microballoons, one or more solvents, and one or more non-hollow, viscosity modifying filler. Also described are a method of preparing the ink formulation, a method of preparing three-dimensional objects comprising low density syntactic foams, and the three-dimensional objects prepared thereby.

An ink formulation for additive manufacturing of low density syntactic foams is described. The ink formulation can include a thermoset resin, a curing agent suitable for use with the thermoset resin, a plurality of hollow spheres, such as glass microballoons, one or more solvents, and one or more non-hollow, viscosity modifying filler. Also described are a method of preparing the ink formulation, a method of preparing three-dimensional objects comprising low density syntactic foams, and the three-dimensional objects prepared thereby.

The present disclosure concerns a porous body made of a ceramic-matrix composite material for an acoustic attenuation panel and a method of manufacturing the porous body. The porous body includes a plurality of interwoven ceramic fibers, a metal oxide matrix, and a plurality of channels interwoven with the ceramic fibers and interconnected together. The channels define at least one cavity. In one form, at least one channel is wrapped around a ceramic fiber. In another form, at least one ceramic fiber and at least one channel are twisted together. In yet another form, at least one channel is wrapped around a ceramic fiber and twisted with the ceramic fiber. The present disclosure also concerns an acoustic attenuation panel including the porous body and an aircraft propulsion unit having such a panel.

The present disclosure concerns a porous body made of a ceramic-matrix composite material for an acoustic attenuation panel and a method of manufacturing the porous body. The porous body includes a plurality of interwoven ceramic fibers, a metal oxide matrix, and a plurality of channels interwoven with the ceramic fibers and interconnected together. The channels define at least one cavity. In one form, at least one channel is wrapped around a ceramic fiber. In another form, at least one ceramic fiber and at least one channel are twisted together. In yet another form, at least one channel is wrapped around a ceramic fiber and twisted with the ceramic fiber. The present disclosure also concerns an acoustic attenuation panel including the porous body and an aircraft propulsion unit having such a panel.

A separator element comprising a porous rigid single-piece substrate (2) made of a single porous material, and including internally at least one channel (3) for passing a flow of the fluid medium, which channel opens out in one end of the porous substrate for inlet of the fluid medium for treatment and in another end of the porous substrate for outlet of the retentate. At least one empty space (10) is arranged in the porous substrate so as to be surrounded by a portion of the material constituting the single-piece substrate (2) either completely so as to form a closed cavity or partially so as to form a cavity (10.sub.1) that opens out locally through the peripheral envelope (2.sub.2) of the substrate via a passage (10.sub.2) of section smaller than the section of the cavity (10.sub.1).

A separator element comprising a porous rigid single-piece substrate (2) made of a single porous material, and including internally at least one channel (3) for passing a flow of the fluid medium, which channel opens out in one end of the porous substrate for inlet of the fluid medium for treatment and in another end of the porous substrate for outlet of the retentate. At least one empty space (10) is arranged in the porous substrate so as to be surrounded by a portion of the material constituting the single-piece substrate (2) either completely so as to form a closed cavity or partially so as to form a cavity (10.sub.1) that opens out locally through the peripheral envelope (2.sub.2) of the substrate via a passage (10.sub.2) of section smaller than the section of the cavity (10.sub.1).

The invention relates to a composite material based on boron nitride (BN(C)) in the form of a continuous structure; and a phase change material (PCM) incorporated within said continuous BN(C) structure and is embedded within a polymer layer, a process for manufacturing same, and the components that comprise same.

A process and an apparatus for refining molten glass. The apparatus includes a porous body having an inlet, an outlet, and a plurality of pores through which molten glass can flow between the inlet and the outlet. The plurality of pores are defined by walls having wall surfaces that are configured to interact with the molten glass as the molten glass flows between the inlet and the outlet to help refine the molten glass.