摘要:
Kompakte, porenfreie Formkörper aus Siliciumcarbid werden dadurch hergestellt, daß man amorphes Siliciumcarbidpulver ohne Zusatz von Sinterhilfsmitteln bei Temperaturen von 1 400 bis 1 800°C und Drucken von 100 bis 2 000 kp/cm² zu einem kompakten glasigen Formkörper verpresst. In einer anschließenden Stufe wird der so erhaltene glasige Formkörper bei Temperaturen von 1 950 bis 2 200°C in kristallines α-Siliciumcarbid umgewandelt.
摘要翻译:紧凑型无孔碳化硅模制品是通过在无烧结助剂的情况下压制无定形碳化硅粉末而制备的,该材料在1400至1800℃和100至2000kp / cm 2之间,以产生致密的玻璃状模制品。 在随后的阶段中,所得的玻璃状模制品在1950℃至2200℃下转化为结晶α-碳化硅。
摘要:
Kompakte, porenfreie Formkörper aus Siliciumcarbid werden dadurch hergestellt, daß man amorphes Siliciumcarbidpulver ohne Zusatz von Sinterhilfsmitteln bei Temperaturen von 1 400 bis 1 800°C und Drucken von 100 bis 2 000 kp/cm² zu einem kompakten glasigen Formkörper verpresst. In einer anschließenden Stufe wird der so erhaltene glasige Formkörper bei Temperaturen von 1 950 bis 2 200°C in kristallines α-Siliciumcarbid umgewandelt.
摘要:
A body including a first phase comprising silicon carbide, a second phase comprising a metal oxide, the second phase being a discrete intergranular phase located at the grain boundaries of the first phase, and the body has an average strength of at least 700 MPa.
摘要:
It is to provide a honeycomb structural body having an excellent durability, which is large in the catching amount of particulates per unit volume and does not cause uneven accumulation of ash and occurrence of cracks or the like even in use for a long period of time, and there is proposed a honeycomb structural body obtained by assembling one or plural porous ceramic members in which two kinds of through-holes consisting of a group of large volume through-holes and a group of small volume through-holes are arranged side by side in the longitudinal direction through partitions and either one ends of these through-holes are plugged, wherein the ceramic member is made of silicon-ceramic composite material consisting of ceramic and silicon.
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:
Disclosed is a method for providing a crystalline ceramic material. In an example, the method includes providing a silicon-containing preceramic polymer material that can be thermally converted to one or more crystalline polymorphs. The silicon-containing preceramic polymer material includes dispersed therein an effective amount of dopant particles. The silicon-containing preceramic polymer material is then thermally converted to the silicon-containing ceramic material. The effective amount of dopant particles enhance the formation of at least one of the one or more crystalline polymorphs, relative to the silicon-containing preceramic polymer without the dopant particles, with respect to at least one of formation of a selected polymorph of the one or more crystalline polymorphs formed, an amount formed of a selected polymorph of the one or more crystalline polymorphs formed, and a temperature of formation of the one or more crystalline polymorphs.
摘要:
A sintered refractory product consisting of: - a granulate consisting of all the particles having a size larger than 100 μm, or "grains", the granulate representing between 55% and 85% by mass of the product, the maximum size of the grains being smaller than 3.5 mm, and - a matrix binding said grains and consisting of the particles having a size smaller than or equal to 100 μm, or "fine particles", said matrix comprising at least one crystallised SiAlON phase of formula Si x Al y O u N v , in which - x is greater than or equal to 0, greater than 0.05, greater than 0.1 or greater than 0.2, and less than or equal to 1, less than or equal to 0.8 or less than or equal to 0.4; - y is greater than 0, or greater than 0.1, greater than 0.3 or greater than 0.5, and less than or equal to 1; - u is greater than or equal to 0, greater than 0.1 or greater than 0.2, and less than or equal to 1 or less than or equal to 0.7; - v is greater than 0, greater than 0.1, greater than 0.2 or greater than 0.5, or greater than 0.7, and less than or equal to 1; at least one of stoichiometric indices x, y, u and v being equal to 1, the volume of the fraction of the pores having a size of between 10 and 100 microns being greater than 4% of the total volume of pores.
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:
Verfahren zur Herstellung eines keramischen Sinterkörpers auf Basis von Siliziumcarbid durch Herstellung eines Gemischs aus Siliziumcarbid-Pulver und mindestens 45 Gew.-% pulverförmigem pyrolysiertem siliziumorganischem Polymer ("Black Glass") und druckunterstütztem Verdichten des Gemischs bei Temperaturen von 1200°C bis 2500°C in inerter Atmosphäre oder im Vakuum, sowie so erhältliche keramische Sinterkörper, die sich insbesondere dadurch auszeichnen, dass sie mindestens eine kristalline Siliziumcarbid-Phase und eine amorphe Phase, die aus den Elementen Silizium, Kohlenstoff, Sauerstoff und gegebenenfalls Stickstoff aufgebaut ist, sowie eine Dichte von mindestens 93% der theoretischen Dichte, bestimmt mittels Wasserverdrängungsverfahren nach Archimedes, aufweisen, wobei der Anteil an kristalliner Siliziumcarbid-Phase mindestens 25 Gew.-% und der Gehalt an anderen Elementen als Silizium, Kohlenstoff, Sauerstoff und Stickstoff vorzugsweise ≤ 150 ppm beträgt.