A surface-coated cutting tool includes a substrate and a coating film that coats the substrate, wherein the coating film includes a hard coating layer constituted of a domain region and a matrix region, the domain region is a region having a plurality of portions divided and distributed in the matrix region, the domain region has a structure in which a first layer composed of a first Al.sub.x1Ti.sub.(1-x1) compound and a second layer composed of a second Al.sub.x2Ti.sub.(1-x2) compound are layered on each other, the matrix region has a structure in which a third layer composed of a third Al.sub.x3Ti.sub.(1-x3) compound and a fourth layer composed of a fourth Al.sub.x4Ti.sub.(1-x4) compound are layered on each other.

The present disclosure relates to a method for analyzing a grain boundary of a polycrystalline two-dimensional material including transferring a polycrystalline two-dimensional material onto a substrate for analysis including a single crystalline two-dimensional material formed on a substrate; analyzing the polycrystalline two-dimensional material; depositing a metal thin film on the polycrystalline two-dimensional material; and exfoliating the polycrystalline two-dimensional material.

A method for treating a carbon or ceramic yarn includes forming a coating on the yarn in a reaction zone of a reactor by heating a segment of the yarn in the presence of a gas phase in a microwave field, wherein the gas phase includes a mixture of a diluent gas and a coating precursor in the vapor state, and wherein the gas phase is formed at least by introducing the diluent gas into the reactor and mixing the introduced diluent gas with the coating precursor in the reactor before the reaction zone.

A method for coating a fiber tow includes moving a fiber tow across a wedge to separate the fiber tow into a plurality of sub-tows, and coating the plurality of sub-tows.

The present disclosure provides a method for preparing a multi-layer hexagonal boron nitride film, including: preparing a substrate; preparing a boron-containing solid catalyst, and disposing the boron-containing solid catalyst on the substrate; annealing the boron-containing solid catalyst to melt the boron-containing solid catalyst; feeding a nitrogen-containing gas and a protecting gas to an atmosphere in which the melted boron-containing solid catalyst resides, the nitrogen-containing gas reacts with the boron-containing solid catalyst to form the multi-layer hexagonal boron nitride film on a surface of the substrate. The method for preparing a multi-layer hexagonal boron nitride film can prepare a hexagonal boron nitride film having a lateral size in the order of inches and a thickness from several nanometers to several hundred nanometers on the surface of the substrate, providing a favorable basis for the application of hexagonal boron nitride in the field of two-dimensional material devices.

Embodiments of the present disclosure generally relate to protective coatings on various substrates including aerospace components and methods for depositing the protective coatings. In one or more embodiments, a method of forming a protective coating on an aerospace component includes forming an aluminum oxide layer on a surface of the aerospace component and depositing a boron nitride layer on or over the aluminum oxide layer during a vapor deposition process. In some examples, the method includes depositing a metal-containing catalytic layer on the aluminum oxide layer before depositing the boron nitride layer. The boron nitride layer can include hexagonal boron nitride (hBN).

The present disclosure provides a method for producing a boron nitride nanotube by heating a boron precursor, and an apparatus therefor. According to an embodiment, a method of producing a boron nitride nanotube includes: inserting several reaction modules each accommodating a holding rod disposed through at least one precursor block into a supply chamber disposed at a front end of a reaction chamber; conveying N reaction modules of the several reaction modules inserted in the supply chamber to a reaction zone of the reaction chamber; growing a boron nitride nanotube in the precursor block by operating the reaction zone for a predetermined time, in the reaction chamber; and conveying the N reaction modules from the reaction chamber to a discharge chamber disposed at a rear end of the reaction chamber after the predetermined time passes. Accordingly, it is possible to maximize the yield and productivity of BNNTs.

A device of executing vacuum processing is provided with: a chamber including a single main chamber executing the vacuum processing and being capable of keeping the chamber as a whole in a depressurized state; a plurality of feeding rollers so arranged as to hang down a plurality of threads in the main chamber with keeping the threads from each other; a plurality of winding bobbins respectively winding the plurality of threads independently, the winding bobbins arranged in the chamber horizontally apart from the plurality of threads vertically hung down; and a plurality of movable arms being respectively movable in the chamber from a first position horizontally apart from the plurality of threads vertically hung down, via a second position in contact with any of the plurality of threads, to a third position to make the threads in contact be in contact with corresponding winding bobbins.

A device of executing vacuum processing is provided with: a chamber including a single main chamber executing the vacuum processing and being capable of keeping the chamber in a depressurized state; a feeding roller so disposed as to hang down a reinforcement fiber in the main chamber; a winding bobbin winding the reinforcement fiber, the winding bobbin disposed in the chamber horizontally apart from the reinforcement fiber vertically hung down; and a swing body pivotally supported in the chamber to swing about a pivot and including a suspension arm capable of capturing and suspending the reinforcement fiber according to a swing motion of the swing body, the suspension arm is capable of swinging from a first position horizontally apart from the reinforcement fiber vertically hung down, via a second position for capturing the reinforcement fiber, to a third position to suspend the reinforcement fiber above the winding bobbin.

A method for forming in situ a boron nitride reaction product locally on a reinforcement phase of a ceramic matrix composite material includes the steps of providing a ceramic matrix composite material having a fiber reinforcement material; and forming in situ a layer of boron nitride on the fiber reinforcement material.