摘要:
Die Erfindung betrifft Verfahren zur Herstellung von beschichteten Keramikfasern, beschichteten Keramikfaser-Gelegen oder -Vliesen, dadurch gekennzeichnet, daß Grünfasern in an sich bekannter Weise hergestellt werden, mit mindestens einem Coating Precursor beschichtet werden und anschließend pyrolisiert werden.
摘要:
Provided is a silicon carbide ceramic having a small amount of resistivity change due to temperature change and being capable of generating heat by current application; and containing silicon carbide crystals having 0.1 to 25 mass% of 4H-SiC silicon carbide crystals and 50 to 99.9 mass% of 6H-SiC silicon carbide crystals, preferably having a nitrogen content of 0.01 mass% or less, more preferably containing two or more kinds of silicon carbide particles containing silicon carbide crystals and silicon for binding these silicon carbide particles to each other and having a silicon content of from 10 to 40 mass%.
摘要:
It is an object of the present invention to provide a low cost and durable silicon carbide member for a plasma processing apparatus. A silicon carbide member for a plasma processing apparatus of the present invention is obtained by mixing an α-silicon carbide powder having an average particle size of 0.3 to 3 µm, wherein an amount of metal impurities in the α-silicon carbide powder is reduced to 20 ppm or less, and a sintering aid comprising B 4 C in amount of 0.5 to 5 weight parts or Al 2 O 3 and Y 2 O 3 in total amount of 3 to 15 weight parts; sintering a mixture of the α-silicon carbide powder and the sintering aid in an argon atmosphere furnace or a high-frequency dielectric heating furnace; and then processing the resulting sintered body.
摘要:
The invention is characterized in that, in a silicon nitride substrate comprising a grain boundary phase with silicon nitride crystal particles and having a heat conductivity of 50W/m·K or greater, the sectional structure of the silicon nitride substrate has a ratio (T2/T1) of 0.01 to 0.30 between the thickness T1 of the silicon nitride substrate and the total length T2 of the grain boundary phase in the thickness direction, and a variation in the dielectric strength of 15% or less from the mean value, as measured by the four terminal method, in which electrodes are brought into contact with the front and the back of the substrate. In addition, a dielectric strength mean value of 15 kv/mm or greater is desirable. According to this constitution, the silicon nitride substrate having a small dielectric strength variation, and the silicon nitride circuit substrate using the same, are obtained.
摘要:
We provide a method for the in situ development of graphene containing silicon carbide (SiC) matrix ceramic composites, and more particularly to the in situ graphene growth within the bulk ceramic through a single-step approach during SiC ceramics densification using an electric current activated/assisted sintering (ECAS) technique. This approach allows processing dense, robust, highly electrical conducting and well dispersed nanocomposites having a percolated graphene network, eliminating the handling of potentially hazardous nanostructures. Graphene/SiC components could be used in technological applications under strong demanding conditions where good electrical, thermal, mechanical and/or tribological properties are required, such as micro and nanoelectromechanical systems (MEMS and NEMS), sensors, actuators, heat exchangers, breaks, components for engines, armours, cutting tools, microturbines or microrotors.
摘要:
Silicon carbide matrix composite material (1) comprising silicon carbide matrix (2) as a host. The silicon carbide matrix (2) comprises first silicon carbide phase (3) of 0.1 to 10 μm average crystal grain diameter and second silicon carbide phase (4) of 0.01 to 2 μm average crystal grain diameter. In interstices of silicon carbide crystal grains constituting the silicon carbide matrix (2), liberated silicon phase (5) amounting to, for example, 5 to 50 wt.% based on the composite material (1) is present continuously in network form. This fine structure enables realizing high strength and high toughness of the silicon carbide composite material (1).