摘要:
An inorganic fibrous shaped refractory article having a high bio-solubility which is capable of exhibiting a desired heat resistance without containing expensive ceramic fibers, alumina powder and silica powder can be provided at a low production cost and with a low product price. An inorganic fibrous shaped refractory article includes 2 to 95 mass% of rock wool, 2 to 95 mass% of inorganic powder having a needle-like crystal structure and 3 to 32 mass% of a binder. Preferably, in the an inorganic fibrous shaped refractory article, the inorganic powder having a needle-like crystal structure has an average length of 1 to 3000 µm and an aspect ratio of 1 to 1000, and more preferably the inorganic powder having a needle-like crystal structure is wollostonite powder or sepiolite powder.
摘要:
Presented are an insulation brick and the method of using an insulation brick to create a thermal lining. A set of corrugations are formed into a sidewall of the brick to increase the thermal insulation. A first end of the insulation brick has a convex portion while the second end of the insulation brick has a convex portion. This allows a first insulation brick to mate with another brick in an end to end configuration.
摘要:
To provide a highly bio-soluble fibrous shaped refractory article which can develop desired heat resistance without containing ceramic fibers such as aluminum silicate fibers, alumina powder and silica powder and can be provided at a low production cost and a low product cost. An inorganic fibrous shaped refractory article comprising 2 to 95 mass% of bio-soluble inorganic fibers having a dissolution ratio in a physiological saline at 40°C of 1 mass% or more, 2 to 95 mass% of inorganic powder having a needle-like crystal structure and 3 to 32 mass% of a binder, and in particular, it is an inorganic fibrous refractory article wherein the inorganic powder having the needle-like crystal structure has an average length of 1 to 3000 µm and an aspect ratio of 1 to 1000.
摘要:
An inorganic fibrous shaped refractory article having a high bio-solubility which is capable of exhibiting a desired heat resistance without containing expensive ceramic fibers, alumina powder and silica powder can be provided at a low production cost and with a low product price. An inorganic fibrous shaped refractory article includes 2 to 95 mass% of rock wool, 2 to 95 mass% of inorganic powder having a needle-like crystal structure and 3 to 32 mass% of a binder. Preferably, in the an inorganic fibrous shaped refractory article, the inorganic powder having a needle-like crystal structure has an average length of 1 to 3000 µm and an aspect ratio of 1 to 1000, and more preferably the inorganic powder having a needle-like crystal structure is wollostonite powder or sepiolite powder.
摘要:
The invention relates to a powder comprising more than 70% of glass-ceramic and/or refractory particles, 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 bigger than 100 μm, respectively, the aggregate, representing more than 60% of the powder, comprising: more than 40% of particles of a glass-ceramic material having a crystallisation rate of higher than 50% and a thermal expansion value, measured at 700°C, of less than 0.3%, called "glass-ceramic grains"; less than 35% of particles of a refractory material different from a glass-ceramic material, called "refractory grains", the quantity of refractory grains being higher than 10% if the aggregate comprises more than 40% of glass-ceramic grains having a thermal expansion value, measured at 700°C, of less than or equal to 0.15%; the matrix, representing more than 10% of the powder, comprising: less than 30% of particles of a refractory material different from a glass-ceramic material,called "fine refractory particles", the quantity of fine refractory particles being higher than 5%, and preferably lower than 25%, if the quantity of glass-ceramic grains having a crystallisation rate of lower than 75% is higher than 5%; and between 0.1% and 18% of particles of a heat-activatable binder; all of the percentages being weight percentages in relation to the weight of the powder.
摘要:
A container for molten metal has at least one opening (4; 24) in which a refractory nozzle brick (5; 5'; 25; 25') is mounted. A refractory purge plug (10; 10') or a refractory sleeve (30; 30') defining an outlet opening (31; 31') is inserted in the nozzle brick opening (6; 6'; 26; 26'). A defined gap is formed between the nozzle brick opening (6; 6'; 26; 26') and the purge plug (10; 10') or the sleeve (30; 30') and is filled with a refractory mass, said mass consisting of a material which can be easily bored or milled out of the mass for the purpose of replacing the purge plug (10; 10') or the sleeve (30; 30'). In this manner, laborious cleaning steps can be avoided and the nozzle brick no longer risks being damaged.
摘要:
A method of manufacturing a refractory structure for lining a metallurgical vessel, the method comprising casting and drying of the structure, whereby particles of refractory material are included in a cast mass, is characterised in that at least 10 volume percent of the particles of the cast mass are large particles the size of which is more than 50 millimetres and within the range of 1/3 to 1/2 of the thickness of the structure, the rest of the particles has at least in the size range of 0 to 6 millimetres a distribution providing dense package, and the amount of formation water in the structure before drying is not more than 5 weight percent, for producing a structure the relative density (the relation of the density of the structure to the density calculated from the densities of the constituents according to the composition) of which is at least 0.87 and preferably at least 0.90. A lining manufactured according to the invention is remarkably more durable than conventional linings, and also costs are often lower.
摘要:
A method for continuous casting of molten steel for a thin sheet, in which, in the casting of aluminum-killed steel, a CaO.MgO based refractory containing 20 mass % or more of a CaO.MgO based clinker is used at least in a portion contacting with molten steel, wherein 60 % or more of MgO crystals contained in particles of the CaO.MgO based clinker have a particle diameter of 50 mum or less. In the method, MgO crystals in the molten steel have a reduced particle, which results in the reduction in the frequency of the occurrence of a scratch even when they are contained as inclusions in a cast steel and the steel is rolled.
摘要:
Disclosed is a method of continuous casting of aluminum-killed steel, using a refractory martial containing 20 mass% or more of CaO · MgO-based clinker. 60% or more of MgO grains included in the grains of the CaO · MgO-based clinker have a diameter of 50 µm or less. The refractory martial is used at least at a portion to be in contact with molten steel. The present invention can reduce the diameter of MgO grains as inclusions in slabs to suppress the occurrence of flaws in a milled sheet metal.