Abstract:
Provided is a method for producing high-purity SiC single crystal, which is applicable to a process of growing SiC single crystal through a solution growth method. This method is for producing SiC single crystal and includes growing, through a solution growth method, an epitaxial layer on a seed material, at least a surface of which is made of SiC, wherein the SiC single crystal is grown so that impurity concentrations therein measured by secondary ion mass spectrometry are very small. Also provided is a housing container for growing SiC single crystal through a solution growth method using a Si melt, including a feed material that is disposed on at least a surface of the housing container and adds, to the Si melt, an additional material that is SiC and/or C. Performing the solution growth method using this housing container can produce high-purity SiC single crystal without any special treatment.
Abstract:
A porous carbon that can sufficiently adsorb water vapor on a high humidity side is provided.A porous carbon is characterized by having mesopores and micropores and having a water vapor adsorbed amount ratio, as defined by the following expression (1), of 1.8 or higher. It is particularly preferable that the water vapor adsorbed amount ratio as defined by the following expression (1) be 2.0 or higher. It is also preferable that the water vapor adsorbed amount at a relative humidity of 70% be 50 mg/g or greater. Water vapor adsorbed amount ratio=water vapor adsorbed amount at a relative humidity of 90%/water vapor adsorbed amount at a relative humidity of 70%. (1)
Abstract:
Provided are a susceptor that, in forming a thin film on a wafer, can reduce impurities or the like adhering to the wafer and a method for manufacturing the same. A susceptor includes a base material (10) with a recess (11), a tantalum carbide layer (22) formed directly on a bottom surface (11a) and a side surface (11b) of the recess (11), and a silicon carbide layer (20) formed on a surface of the base material (10) except for the recess (11).
Abstract:
Provided is a heat treatment container having a small size and capable of efficiently performing a heat treatment on a SiC substrate. A heat treatment container is a container for a heat treatment on a SiC substrate 40 under Si vapor pressure. The SiC substrate 40 is made of, at least in a surface thereof, single crystal SiC. The heat treatment container includes a container part 30 and a substrate holder 50. The container part 30 includes an internal space 33 in which Si vapor pressure is caused. The internal space 33 is partially open. The substrate holder 50 is able to support the SiC substrate 40. When the substrate holder 50 supports the SiC substrate 40, an open portion of the container part 30 is covered so that the internal space 33 is hermetically sealed.
Abstract:
ObjectProvided is a catalyst having an excellent durability and being capable of lowering the cost of a fuel cell.Solving MeansDisclosed is a catalyst configured to include a support and alloy particles including platinum and a metal component other than platinum supported on the support, wherein the catalyst includes mesopores having a radius of 1 to 10 nm originated from the support, wherein a mode radius of the mesopores is in a range of 2.5 to 10 nm, and wherein the alloy particles have a catalyst function, and at least a portion of the alloy particles is supported inside the mesopores.
Abstract:
A graphite sheet includes: a graphite portion made of a graphite; and at least one ceramic filler provided within the graphite portion, having a substantially spherical shape, and made of a ceramic having a thermal conductivity higher than a thermal conductivity in a c-axis direction of the graphite.
Abstract:
Provided is a silicon carbide-tantalum carbide composite having excellent durability. A silicon carbide-tantalum carbide composite (1) includes: a body (10) whose surface layer is at least partly formed of a first silicon carbide layer (12); a tantalum carbide layer (20); and a second silicon carbide layer (13). The tantalum carbide layer (20) is disposed over the first silicon carbide layer (12). The second silicon carbide layer (13) is interposed between the tantalum carbide layer (20) and the first silicon carbide layer (12). The second silicon carbide layer (13) has a C/Si composition ratio of not less than 1.2 as measured by X-ray photoelectron spectroscopy. The second silicon carbide layer (13) has a peak intensity ratio G/D of not less than 1.0 between the G-band and D-band of carbon as measured by Raman spectroscopy.
Abstract:
The present application aims to provide a surface treatment method that is able to accurately control the rate of etching a single crystal SiC substrate and thereby enables correct understanding of the amount of etching. In the surface treatment method, the single crystal SiC substrate is etched by a heat treatment performed under Si vapor pressure. At a time of the etching, inert gas pressure in an atmosphere around the single crystal SiC substrate is adjusted to control the rate of etching. Accordingly, correct understanding of the amount of etching is obtained.
Abstract:
A masking portion (recessed portion) 20 is provided at the center of a rear surface of a carbonaceous substrate 10. The masking portion 20 includes a first bore portion 20a and a second bore portion 20b. The first bore portion 20a has an inner wall in which a female screw portion 21 is formed. A male screw portion 7a of a masking jig 7 is screw-fitted to the female screw portion 21. The masking jig 7 is fixed to a film forming jig 2. The carbonaceous substrate is thus supported in a standing posture, and the carbonaceous substrate is provided, on a surface, with a firm such as a SiC film or a TaC film except for the recessed portion by introducing gas into the apparatus in this supported state.
Abstract:
Long carbonaceous moldings and long carbonaceous products as well as methods of production thereof by which carbonaceous products can be obtained without allowing twisting or curving and with less frequent occurrence of cracking etc. even when subjecting the heat treatment and which are excellent in mass productivity are provided. The long carbonaceous moldings have an aspect ratio of 3 to 20 and showing fluctuations in the density thereof of not more than 0.05 Mg/m3 throughout the whole moldings.
Abstract translation:提供长碳质成型体和长碳质物,以及即使在经受热处理并且具有优异的批量生产率的情况下,也可以提供可以获得碳质产物而不允许扭曲或弯曲并且发生较少裂纹的生产方法 。 该长碳质成型体的纵横比为3〜20,在整个模制品中,其密度波动不大于0.05Mg / m 3。