Provided is a boron nitride sintered body having a porous structure, the boron nitride sintered body including a lump particle formed by aggregation of primary particles of boron nitride and having a particle diameter of 15 μm or more. Provided is a method for manufacturing a boron nitride sintered body, the method including: a nitriding step of firing a raw material powder containing boron carbide in an atmosphere containing nitrogen to obtain a fired product including lump particles each having a core part with primary particles of boron carbonitride aggregated and a shell part surrounding the core part; and a firing step of molding and heating a blend containing the fired product including lump particles and a sintering aid to obtain the boron nitride sintered body having a porous structure and including lump particles of boron nitride.

A composite material fabrication method includes stacking a plurality of fiber layers and a first binder and curing the first binder to form a three-dimensional structure with a plurality of mesh openings, and filling the plurality of mesh openings with a plurality of fiber filaments of a fiber array and a second binder and curing the second binder. A plurality of first mesh openings of the plurality of mesh openings are connected in a first direction.

The present disclosure relates to an apparatus for fluidised-bed chemical vapour deposition from a gaseous phase allowing the temperature of the fluidised bed to be stabilised during the deposition and also to an associated method for its implementation, the apparatus being characterised in that it comprises a porous thermal insulator present in an inlet zone and configured to be passed through by the gaseous phase, said porous thermal insulator having an effective thermal conductivity at 20° C. less than or equal to 3.5 W.Math.m-1.Math.K-1.

A reactor furnace for coating fiber tow includes an elongate reactor having a fiber tow inlet and a fiber tow outlet; a thermo-chemical reactor section positioned along the elongate reactor; a first microwave source for directing microwave energy along the reactor from a first end of the reactor toward a second end of the reactor; a second microwave source for directing microwave energy along the reactor from the second end of the reactor toward the first end of the reactor; a gas inlet upstream of the thermo-chemical reactor; and a gas outlet downstream of the thermo-chemical reactor.

Disclosed herein is a ceramic matrix composite comprising a preform comprising a plurality of plies; a ceramic matrix encompassing the plies and distributed through the plies; and thermally conducting particles distributed through the ceramic matrix. Disclosed herein is a method comprising distributing thermally conducting particles between plies in a preform; infiltrating chemical vapors of a ceramic precursor into the plies; and reacting the ceramic precursor to form a matrix.

The disclosure related to a method for making a nanowire structure. First, a free-standing carbon nanotube structure is suspended. Second, a metal layer is coated on a surface of the carbon nanotube structure. The metal layer is oxidized to grow metal oxide nanowires.

The present invention provides a novel silicon carbide fiber reinforced silicon carbide composite material, which is a composite material of SiC fibers and SiC ceramics with improved toughness, that can be produced with high yield by a relatively simple production step without complex production steps such as a step of oxidation-resistant coating or an advanced interface control step.

The silicon carbide fiber reinforced silicon carbide composite material comprising a multiphase matrix containing a silicon carbide phase and a phase comprising a substance having low reactivity with respect to silicon carbide; and silicon carbide fibers disposed in the matrix can be obtained by a production step suitable for mass production. The composite material ensures greatly improved fracture toughness while maintaining the excellent properties of SiC ceramics.

A cubic boron nitride-based sintered material includes cubic boron nitride particles of 70 to 95 vol %, in which in a structure of a cross-section of the sintered material, a binder phase with a width of 1 nm to 30 nm is present between the adjacent cubic boron nitride particles, the binder phase being made of a compound containing at least Al, B, and N and having a ratio of an oxygen content to an Al content of 0.1 or less in terms of atomic ratio.

The present disclosure provides processes for forming angular ceramic particles. In at least one embodiment, a process for forming angular ceramic particles includes providing a slurry having a ceramic raw material having alumina. The process includes atomizing the slurry into droplets and coating seeds comprising alumina with the droplets to form green pellets. The process includes sintering the green pellets to form sintered pellets. The process includes breaking the sintered pellets to form the angular ceramic particles comprising a sintered ceramic material. The angular ceramic particles can have an abrasion loss that is less than that of angular ceramic particles formed by crushing the green pellets prior to sintering.

A method for densifying one or more porous substrates with pyrolytic carbon by chemical vapour infiltration, includes admitting, at the inlet of the densification furnace, a reactive gaseous phase including at least one pyrolytic carbon precursor; reacting at least a fraction of the reactive gaseous phase with the porous substrate or substrates; extracting, at the outlet of the densification furnace, gaseous effluents originating from the reactive gaseous phase; reintroducing, with the reactive gaseous phase admitted at the inlet of the densification furnace, at least a fraction of the gaseous effluents extracted at the outlet of the furnace, wherein the fraction of the gaseous effluents introduced with the reactive gaseous phase includes at least one polyaromatic hydrocarbon compound.