摘要:
A ceramic foam filter for use in filtering non-ferrous metals and manufacturing method for same are disclosed. The ceramic foam filter includes calcined alumina as a core material and silica as a binder. Alternatively, the ceramic foam filter includes calcined alumina as a core material and boric oxide as a binder.
摘要:
Provided is a hearth roll for supporting and conveying a steel sheet in a continuous annealing furnace, wherein all of a shaft portion and a roil main body are made from one or more ceramic materials, preferably constituted with concentric ceramic layers of different ceramic materials centering on the rotation shaft of the roll. The hearth roll has not only an excellent pickup resistance but also a long roll life free from maintenance for long periods. Also provided is a continuous annealing facility using the hearth roll in at least one of a heating zone, a soaking zone and a cooling zone.
摘要:
The invention relates to a refractory ceramic batch for the production of an unformed refractory ceramic batch, the use of a batch of this kind for lining metallurgical melting vessels and also a metallurgical melting vessel which is lined with an unformed refractory ceramic product based on a batch of this kind.
摘要:
A refractory, which is particularly suitable for use in an inner lining of a blast furnace, is obtainable by a process. The process includes providing a mixture containing coke, silicon and a binder. A green block is formed from the mixture. The green block is then baked. The baked block is semi-graphitized at a temperature between 1600 and 2000° C.
摘要:
The invention relates to a powder comprising more than 70% of refractory particles, in weight percent relative to the weight of the powder, a particle of said powder being classed in the fraction called “matrix” or in the fraction called “aggregate”, according to whether it is smaller than, or equal to 100 μm, or larger than 100 μm, respectively, said powder comprising, in weight percent relative to the weight of the powder: between 0.1% and 18% of particles of a heat-activatable binder, called “heat-activatable binder particles”; and more than 40% of refractory particles, called “ATZ particles”, having the following chemical composition, in weight percentages on the basis of the oxides of said ATZ particles: 10%≦Al2O3≦55%; 35%≦TiO2≦80%; 1%≦MgO+Cr2O3≦10%; 8%≦ZrO2≦20%; SiO2≦8%.
摘要:
A sensor system, and an associated method for detecting harsh environmental conditions, is provided. The sensor system includes at least one sensor having an electrical sensing element. The electrical sensing element is based on certain classes of composite materials: (a) silicon carbide (SiC); (Mo,W)5Si3C; (Mo,W)Si2; or (b) (Mo,W)5Si3C; (Mo,W)Si2; (Mo,W)5Si3. The sensor system is useful for determining harsh environmental conditions. Gasification systems, which include at least one of the sensor systems are also described.
摘要:
Exemplary embodiments of the invention provide a vessel for containing or conveying molten metal therein. At least part of the outer surface of the vessel incorporates a web of metal wires embedded in the surface, the wires being mutually overlaid with openings formed therebetween. The refractory material penetrates into the openings. The web may comprise woven metal wires or non-woven wires or both. The web imparts resistance to cracking (or containment of cracks, once formed) and/or resistance to molten metal leakage if cracks develop. The invention also provides metal containment structures containing such vessels, and methods of producing the same.
摘要:
The disclosed invention relates to a refractory made from an as-batched composition comprising alumina, a rare earth oxide, and optionally an oxide of a transition metal comprising Sc, Zn, Ga, Y, Cd, In, Sn, Tl or a mixture of two or more thereof, the refractory being characterized by the absence of SiO2 or a concentration of SiO2 of no more than about 0.2% by weight.
摘要:
Provided is a zirconia-mullite refractory raw material which is less likely to undergo alternation and microstructural degradation under high-temperature conditions, and low in thermal expansion rate, so as to have thermal shock resistance and corrosion resistance. The zirconia-mullite refractory raw material comprises crystalline zirconia and mullite as primary components, with the remainder being corundum and/or a matrix glass, wherein the crystalline zirconia includes a eutectic zirconia crystal having a grain size of 1.0 μm or less, and has a maximum grain size of 30 μm or less, and the matrix glass is contained in an amount of 5 mass % or less. The zirconia-mullite refractory raw material has a chemical composition comprising 30 to 55 mass % of ZrO2, 30 to 55 mass % of Al2O3 and 10 to 25 mass % of SiO2, wherein each of the chemical components falls within a primary phase region of ZrO2 in an Al2O3—ZrO2—SiO2 system phase diagram.
摘要:
A refractory composition for use in contact with molten aluminum and molten aluminum alloys containing a refractory aggregate, a binder, and a treatment additive comprising a source of Sr. Methods comprising contacting a refractory composition with the Sr source to improve the resistance of the refractory to molten aluminum attack are also disclosed. Preferred treatment agents comprise Sr nitrate, Sr carbonate, Sr sulfate and Sr oxide.