Abstract:
PROBLEM TO BE SOLVED: To provide a refractory containing thick flake graphite that exhibits stable service life by having the characteristics of small variations in strength and making crack progression difficult.SOLUTION: The refractory containing thick flake graphite contains thick flake graphite having a thickness of ≥50 μm and
Abstract:
PROBLEM TO BE SOLVED: To provide a sliding nozzle apparatus using an intermediate rod in order to be attachable/detachable to/from a driving mechanism, wherein the intermediate rod is prevented from falling off when changing a plate.SOLUTION: The sliding nozzle apparatus includes a fixed metal frame 2 fixed to a bottom part of a molten metal container 1, an opening/closing metal frame 3 which is openably/closably connected to the fixed metal frame, a sliding metal frame 4 which is slidably arranged in the opening/closing metal frame, and an intermediate rod 10. One end 10a of the intermediate rod is attachably/detachably fitted to the sliding metal frame, and the other end 10b of the intermediate rod is attachably/detachably fitted to the driving mechanism 11 for sliding the sliding metal frame. An engagement part 10c to be engaged with an intermediate rod supporter for supporting the intermediate rod is provided on the intermediate rod.
Abstract:
PROBLEM TO BE SOLVED: To provide a carbon-containing refractory having both excellent strength and thermal shock resistance, keeping excellent slag infiltration resistance and having sufficient durability. SOLUTION: The carbon-containing refractory is produced by adding ≤5 mass% fullerene in outer percentage and 0.5-5 mass% pitch in outer percentage with a thermosetting organic resin as an organic binder into magnesia based, spinel based, alumina based refractory raw material powder, kneading, forming and heat-treating. In the carbon-containing refractory, carbon nanofiber having 5-10 nm diameter and 100-300 nm length and is present in a bonded structure and the carbon-containing refractory is used suitably for a dipping nozzle or a long nozzle. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for using a sliding nozzle device which can deal with high grade steel and minimize the increase of refractory cost as necessary. SOLUTION: In the method for using a sliding nozzle device of applying bearing pressure to a space between plates by a bearing pressure variable mechanism, when relatively high bearing pressure is applied, relatively thick plates 5a, 7a are used, and, when relatively low bearing pressure is applied, relatively thin plates 5b, 7b are used, and further, spacers 14 with a thickness corresponding to a degree at which the plates are thinned are arranged at the non-sliding face sides of the plates 5b, 7b. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a silicon carbide ceramic with a high density and a high stiffness, and its producing method. SOLUTION: The producing method comprises that a formed body where a raw material powder in which aluminum oxide of 1-10 mass% and a rare earth oxide of 1-10 mass% are contained and whose residual component consists of silicon and an unavoidable impurity, wherein the ratio of aluminum in aluminum oxide to a rare earth element in the rare earth oxide is in the range between 95:5-65:35 in terms of mole ratio, is formed, buried in a mixed powder having the same range of components as the raw material powder and sintered in an inert gas atmosphere, at 1,750-2,100°C and at a normal pressure. The highly dense silicon carbide ceramic having a density of 3.10 g/cm 3 or more and a Young's modulus of 405 GPa or more is obtained by the method. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To improve especially the hot strength in a refractory using a refractory raw material coated with nanocarbon. SOLUTION: The refractory is produced by adding an organic resin to a refractory raw material mixture containing a refractory raw material coated with nanocarbon in which at least a part of the surface of a refractory raw material particle is coated with carbon nanofibers and/or carbon nanotubes and kneading, and heat-treating the obtained body after molding, where the refractory raw material coated with nanocarbon having an amount of residual carbon obtained from the organic resin which is 1.2 mass% or more and 10.0 mass% or less to the mass of the whole refractory raw material mixture is used for the refractory. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To obtain silica stone brick for hot repairing which is free from the occurrence of crack or damage due to temperature change by quickly heating and cooling across a temperature zone of about 250°C and can keep excellent thermal shock resistance over a long period. SOLUTION: In a method of producing the silica stone brick for hot repairing using a refractory raw material formulation comprising 30-65 mass% tridymite clinker and 35-70 mass% molten quartz, the tridymite clinker contains 90 mass% tridymite as a mineral phase, wherein the ratio Ic/It of X-ray diffraction intensity Ic of low temperature type cristobalite to X-ray diffraction intensity It of low temperature type tridymite and the ratio Iq/It of X-ray diffraction intensity Iq of low temperature type quartz to X-ray diffraction intensity It of low temperature type tridymite is respectively ≤0.05. Because a tridymite phase having small volume change following the low temperature-high temperature type transition is enriched, the silica stone brick for hot repairing which has excellent thermal shock resistance is produced. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a monolithic refractory which is hardly eroded by furnace contents containing K 2 O and Na 2 O by ≥2 mass% in total. SOLUTION: The monolithic refractory is constructed at a part which can be brought into contact with furnace contents containing K 2 O and Na 2 O by ≥2 mass% in total. The monolithic refractory has a fine particle portion of COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a baking repairing material shortenable of time for solidification and making the internal structure of a construction object difficult to be made porous. SOLUTION: In baking repairing materials containing fireproof powder and an organic binder, the baking repairing material is characterized by containing manganese dioxide powder of 5 mass% or more expressed in terms of outer percentage to an organic binder. Because manganese dioxide powder starts decomposition reaction which emits oxygen in hot process, oxygen required for combustion of the volatile substance of an organic binder is securable in the inside of a construction object and combustion from the inside of a construction object can be promoted. COPYRIGHT: (C)2011,JPO&INPIT