A ceramic matrix composite (CMC) component includes at least one seal surface, the at least one seal surface disposed adjacent an interfacing surface for providing a seal therebetween; and a coating disposed on the seal surface. The coating includes an aluminum oxide and/or a silicon dioxide.

A fibrous ceramic preform includes a plurality of ceramic fibers, a first amorphous layer, and an interfacial coating layer. The interfacial coating layer includes an anisotropic region adjacent the at least one amorphous layer, and an isotropic region on a side of the anisotropic region opposite the at least one amorphous layer.

A process for manufacturing a composite part includes introducing an adhesion promoter into the pores of a fibrous preform formed by threads covered with a coating having OH groups on its surface, the adhesion promoter including an electron-withdrawing group G1 that is reactive according to a reaction of substitution or of nucleophilic addition with the OH groups, and a reactive group G2; grafting the adhesion promoter to the surface of the coating by a reaction of substitution or nucleophilic addition of the OH groups on the group G1; introducing a ceramic precursor resin into the pores of the fibrous preform; polymerizing the resin introduced and bonding the grafted adhesion promoter to the resin by chemical reaction between these two compounds at the level of the group G2, and forming a ceramic matrix phase in the pores of the fibrous preform by pyrolysis of the polymerized resin.

The invention discloses a sound-absorbing material particle and a preparation method thereof. The preparation method comprises the following steps: step 1, mixing a sound-absorbing raw material with a templating agent and water to prepare a sound-absorbing slurry, filling a reaction kettle with a porous ceramic substrate and the sound-absorbing slurry that are mixed together; step 2, performing hydrothermal crystallization in the reaction kettle to ensure that the sound-absorbing raw material is crystallized on the porous ceramic substrate and constitutes the sound-absorbing material particle together with the porous ceramic substrate; step 3, performing solid-liquid separation on the materials in the reaction kettle; and step 4, drying and roasting the sound-absorbing material particle.

The invention discloses a sound-absorbing material particle and a preparation method thereof. The preparation method comprises the following steps: step 1, mixing a sound-absorbing raw material with a templating agent and water to prepare a sound-absorbing slurry, filling a reaction kettle with a porous ceramic substrate and the sound-absorbing slurry that are mixed together; step 2, performing hydrothermal crystallization in the reaction kettle to ensure that the sound-absorbing raw material is crystallized on the porous ceramic substrate and constitutes the sound-absorbing material particle together with the porous ceramic substrate; step 3, performing solid-liquid separation on the materials in the reaction kettle; and step 4, drying and roasting the sound-absorbing material particle.

The present disclosure provides systems and methods for forming a composite structure comprising rotating a base layer of an apparatus for forming the composite structure about an axis of rotation, transferring carbon short fibers from a first vibratory feed ramp onto the base layer in order to form a plurality of fibrous layers in the composite structure, and vibrating the first vibratory feed ramp during the transferring the carbon short fibers. The base layer may comprise an annular shape.

Provided are a SmFeN magnetic powder which is superior not only in water resistance and corrosion resistance but also in hot water resistance, and a method of preparing the powder. The present invention relates to a method of preparing a magnetic powder, comprising: plasma-treating a gas; surface-treating a SmFeN magnetic powder with the plasma-treated gas; and forming a coat layer on the surface of the surface-treated SmFeN magnetic powder.

Provided are a SmFeN magnetic powder which is superior not only in water resistance and corrosion resistance but also in hot water resistance, and a method of preparing the powder. The present invention relates to a method of preparing a magnetic powder, comprising: plasma-treating a gas; surface-treating a SmFeN magnetic powder with the plasma-treated gas; and forming a coat layer on the surface of the surface-treated SmFeN magnetic powder.

A degradable device component or tool provided with one or more target physical parameter values and shaped from a precursor composite material. The precursor composite material includes a core material in particulate form having one or more real physical parameter values exceeding the target physical parameter values; a first layer material provided on the core material and a second layer material provided on the first layer material, wherein the first layer material and the second layer material are together capable of forming a galvanic cell; and a melted outer layer material provided directly or indirectly on the second layer, the outer layer having a melting point below the melting points of the core material, the first layer material and the second layer material.

A cubic boron nitride particle population having highly-etched surfaces and a high toughness index is produced by blending a reactive metal powder with a plurality of cubic boron nitride particles to form a blended mixture. The blended mixture is compressed to form a compressed mixture. The compressed mixture is subjected to a temperature and a pressure, where the temperature is controlled to cause etching of the plurality of cubic boron nitride particles by reaction of cubic boron nitride with the reactive metal powder, thereby forming a plurality of etched cubic boron nitride particles. Also, the temperature and pressure are controlled to cause boron nitride to remain in a cubic boron nitride phase. Afterwards, the plurality of etched cubic boron nitride particles is recovered from the compressed mixture to form the particle population. Preferably, the particle population contains no hexagonal boron nitride.