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1. 发明专利

JPH02171587A METAL MELTING CRUCIBLE 失效
公开(公告)号：JPH02171587A
公开(公告)日：1990-07-03
申请号：JP33008288
申请日：1988-12-26
申请人： KAWASAKI REFRACTORIES CO LTD , NIPPON SHEET GLASS CO LTD
发明人： OKAMOTO TAKESHI , TANAKA SEIJIRO , KAWAKAMI TATSUO , NAKAI HIDEMI , MAEDA MASATOSHI
IPC分类号： F27B14/10
摘要： PURPOSE:To ensurely perform metal melting to make possible repeated use by drilling a through hole in the bottom wall of a metal melting crucible made of ceramic used to mount on an electrically conductive base earthed. CONSTITUTION:A metal M is heated on the basis of electron beam irradiation (e) in vacuum on metal melting. The metal M melted by the electron beam irradiation (e) is allowed to flow in a through hole 1a in the bottom wall of a crucible 1, comes in contact with the upper part of an electrically conductive base 2 to cool so as to solidify as it is in contact with the base 2. The melting metal M of the crucible 1 is earthed through the metal M solidified in the trough hole 1a and the electrically conductive base 2 in contact with the solidified metal M and electrification of the meting metal M in the crucible is prevented thereby. Accordingly, the metal melting crucible 1 surely performs metal melting with the use thereof and a bumping phenomenon by over- electrification of the melting metal M is prevented. Since the crucible 1 is made of ceramic, it endures repeated use and difficult to wear without reaction with the melting metal M and the permeation of the melting metal M.

2. 发明专利

JPH02242082A CRUCIBLE FOR SMELTING AND EVAPORATING METAL 失效
公开(公告)号：JPH02242082A
公开(公告)日：1990-09-26
申请号：JP6121989
申请日：1989-03-13
申请人： KAWASAKI REFRACTORIES CO LTD , NIPPON SHEET GLASS CO LTD
发明人： OKAMOTO TAKESHI , TANAKA SEIJIRO , KAWAKAMI TATSUO , MAEDA MASATOSHI , NAKAI HIDEMI
IPC分类号： C23C14/24 , C04B35/52 , F27B14/10
摘要： PURPOSE:To permit the smelting and the evaporation of a metal surely and permit further the smelting and the evaporation of a metal such as stainless steel or super alloy safely and surely by a method wherein a crucible is provided with the double layered structure of an outer crucible and an inner crucible, provided freely in the outer crucible substantially, while the outer crucible is made of a composite ceramic having the principal constituent of boron nitride and the inner crucible is made of isotropic graphite having a specific density. CONSTITUTION:The subject crucible is provided with the double layered structure of an outer crucible and an inner crucible, provided freely in the outer crucible substantially. The outer crucible is constituted of a composite ceramic, made by blending the base of boron nitride with at least one kind of the material of the ceramics such as Al2O3, ZrO2, Si3N4, AlN, TiN, ZrN, Y2O3, MgO, B4C, ZrC, ZrB2, TiB2 or the like and provided with a bending strength higher than 10kgf/mm . A crucible, made of isotropic graphite and having the density of 1.70-1.93g/cm , is employed as the outer crucible. The thermal expansion coefficient of the inner crucible is preferably as small as possible and the same coefficient less than 5.0X10 is proper.

3. 发明专利

JP2000203951A LIGHT WEIGHT HEAT-INSULATING CASTABLE COMPOSITION 失效
公开(公告)号：JP2000203951A
公开(公告)日：2000-07-25
申请号：JP87099
申请日：1999-01-06
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： YAMANE TOSHIO , OKAMOTO TAKESHI , TANAKA SEIJIRO
IPC分类号： C04B35/66
摘要： PROBLEM TO BE SOLVED: To compensate recent insufficiency of skilled workers and to easily realize reduction of labor by forming a lightweight heat-insulating refractory wall by execution of spraying castable composition to the heat-insulating part of a heating furnace for steel, of the lining of a tundish, of the lining of a molten steel ladle or of a recent refuse incinerator. SOLUTION: The lightweight heat-insulating castable composition contains ceramic fiber wool and/or lightweight aggregate particle, on which at least one of portland cement or alumina cement and at least one hardening agent selected from calcium sulfate, aluminum sulfate, magnesium sulfate, gypsum, hemihydrate gypsum and alum are coated. The lightweight heat-insulating refractory wall can be formed by execution of spraying.

4. 发明专利

JPH1163850A METHOD FOR CASTING UNSHAPED REFRACTORY IN MELTED METAL CONTAINER 失效
公开(公告)号：JPH1163850A
公开(公告)日：1999-03-05
申请号：JP27500797
申请日：1997-08-27
申请人： KAWASAKI STEEL CO , KAWASAKI REFRACTORIES CO LTD
发明人： KAMO MOMOKI , YOSHIDA MASAKAZU , KUWAYAMA MICHIHIRO , OKAMOTO TAKESHI , IIDA ATSUHISA
IPC分类号： B22D41/02 , B22D11/10 , C21C7/00 , F27D1/16
摘要： PROBLEM TO BE SOLVED: To prevent executing trouble due to a binder system by kneading alumina cement by adding water to unshaped refractory, and curing obtained executed material at a temperature of a specific range for a predetermined time or more so as not to harden it on the way of flowing due to freezing or quick setting. SOLUTION: In the case of flowing alumina unshaped refractory for a ladle, water is added to the unshaped refractory containing alumina cement as a binder, and kneaded. Then, the obtained executed material is cured at an atmospheric temperature in a melted metal container at 35 to 75 deg.C for 10 hr or more so that the material is not hardened on the way of casting due to freezing or quick setting. Thus, even in the case of low atmospheric temperature, sufficient strength can be developed. And, even under the condition that an operation must be started in a short time, execution of cast unshaped refractory can be performed without a rupture in a main drying.

5. 发明专利

JPH10139527A PRODUCTION OF PLATE REFRACTORIES TO SLIDING NOZZLE 失效
公开(公告)号：JPH10139527A
公开(公告)日：1998-05-26
申请号：JP30028496
申请日：1996-11-12
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： SASAKI KIMIAKI , OKAMOTO TAKESHI , TANAKA SEIJIRO
IPC分类号： C04B35/00
摘要： PROBLEM TO BE SOLVED: To provide a process for producing plate refractories for sliding nozzles which contain aluminum nitride having excellent corrosion resistance have excellent wear resistance by high strength and excellent heat spalling resistance. SOLUTION: Metal aluminum and org. compsn. contg. nitrogen, such as dicyandiamide (C2 H4 H4 ), cyanuric acid (C3 H3 N3 O3 ) and melamine (C3 H6 N6 ), are previously mixed and this compd. mixture is compounded with a raw material consisting essentially of alumina and carbon at 1 to 20wt.% in terms of the aluminum nitride. The mixture is kneaded and molded and is calcined in a nonoxidative atmosphere. As a result, the plate refractories for sliding nozzles which contain the aluminum nitride having the excellent corrosion resistance and have the excellent wear resistance by high strength and the excellent spalling resistance are produced.

6. 发明专利

JPH07179928A PLUG FOR STIRRING MOLTEN METAL CAPABLE OF THERMALLY SPRAY REPAIRING SURROUNDING BRICKS AND ITS MANUFACTURE 失效
公开(公告)号：JPH07179928A
公开(公告)日：1995-07-18
申请号：JP34583093
申请日：1993-12-24
申请人： NISSHIN STEEL CO LTD , KAWASAKI REFRACTORIES CO LTD
发明人： YAMAMOTO ATSUSHI , OKAMOTO TAKESHI , MIZOGUCHI TETSUO
IPC分类号： B22D41/52 , B22D41/58 , C21C7/072 , C21C7/10 , F27D3/16
摘要： PURPOSE:To manufacture a plug for stirring molten metal capable of thermally spraying repairing the surrounding bricks with hardly generating sealing phenomenon, etc., at the time of applying the thermally spray-repairing to the worn recessed part of the surrounding bricks fitting the plug for stirring the molten to a vessel for molten metal. CONSTITUTION:This plug is fitted to the bottom part or near the bottom part of the vessel for molten metal to blow inert gas into the molten metal in order to mainly stir the molten metal in the vessel. Then, in this plug 1 having a structure composed of a gas permeable part 1a for permeating the gas for stirring the molten metal at the center part and a nearly gas impermeable castable refractory part 1b at the outer peripheral part, residual moisture content in the castable refractory part 1b is defined as =18hr in a furnace.

7. 发明专利

JPH0337108A ISOTROPIC CARBON MATERIAL 失效
公开(公告)号：JPH0337108A
公开(公告)日：1991-02-18
申请号：JP17064489
申请日：1989-06-30
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： OSHIMA HIROAKI , OKAMOTO TAKESHI , TANAKA SEIJIRO , KAWAKAMI TATSUO
IPC分类号： C01B31/02 , C01B31/04
摘要： PURPOSE:To obtain a carbon material having a high density and strength imparted thereto without using a binder by blending mesocarbon microbeads with a specific amount of scaly graphite, press forming the resultant blend using a rubber press and calcining the formed blend. CONSTITUTION:Mesocarbon microbeads having about 15mum average grain diameter in an amount of 100 pts. wt. is blended with 0.5-50 pts.wt. scaly graphite having = about 2000 deg.C. Thereby, products having characteristics, such as wide ranges of heat conductivity and hardness, according to demand can be produced by using the aforementioned material.

8. 发明专利

JPH01169190A MANUFACTURE OF WEAR RESISTING METAL PIPE 失效
公开(公告)号：JPH01169190A
公开(公告)日：1989-07-04
申请号：JP32622287
申请日：1987-12-23
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： OKAMOTO TAKESHI , TANAKA SEIJIRO , KAWAKAMI TATSUO
IPC分类号： F16L9/14 , F16L58/14
摘要： PURPOSE:To easily further simply perform processing work by heating a metal pipe to a temperature of shrinkage fitting thereafter inserting pipe-shaped ceramics into the metal pipe interposing a molded material dispersedly providing voids. CONSTITUTION:A molded material 3 can be inserted between a metal pipe 1 and a pipe-shaped ceramics 2, internally inserted into the metal pipe 1, and the molded material 3, which dispersedly provides voids forming a cross sectional shape coming into contact with peripheral walls of the metal pipe 1 and the pipe-shaped ceramics 2 when the material 3 is inserted, is prepared. As the molded material 3, a corrugated plate, formed into a pipe-shape in a manner wherein its corrugated section appears in the peripheral direction, or the like is applied. After the metal pipe 1 is heated to a temperature of shrinkage fitting, the pipe-shaped ceramic 2 is inserted interposing the molded material 3 into the metal pipe 1, and being based on the shrinkage following a decrease of temperature of the metal pipe 1, it holds the pipe-shaped ceramics 2 to be fixed under interposition of the molded material 3.

9. 发明专利

JPH01150095A PIPING FOR TRANSPORTING POWDER 失效
公开(公告)号：JPH01150095A
公开(公告)日：1989-06-13
申请号：JP30841287
申请日：1987-12-04
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： OTA HIROMICHI , OKAMOTO TAKESHI , TANAKA SEIJIRO , KAWAKAMI TATSUO
IPC分类号： C04B35/00 , B65G53/56 , F16L41/02 , F16L49/00
摘要： PURPOSE: To enhance the wear resistance and raise the durability apparently by forming a branched section of the pipe for carrying powder with ceramic one-piece molded sintered product. CONSTITUTION: A branched section 1 of a pipe for carrying powder is formed by ceramic one-piece molded sintered product. Alumina, zirconia and silicon nitride may suitably be used as the material of the one-piece molded branched pipe 1 of ceramics. As it is difficult for the conventional extrusion molding method or IP molding method to form the branched pipe in one piece, slip casting is used as the molding method.

10. 发明专利

JPH0197523A ELECTRODE FOR ELECTRIC DISCHARGE MACHINE 失效
公开(公告)号：JPH0197523A
公开(公告)日：1989-04-17
申请号：JP25407887
申请日：1987-10-07
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： OKAMOTO TAKESHI , TANAKA SEIJIRO , KAWAKAMI TATSUO
IPC分类号： B23H1/06
摘要： PURPOSE:To improve fine precision machining efficiency, by a method wherein a title electrode is formed by a graphite material, formed by mesocarbon microbeads with a grain size of 20mum or less serving as a raw material and having given density, bending strength electric ratio resistance, an anisotropic ratio, and a thickness of 0.5-0.03mm. CONSTITUTION:An electrode for electric discharge machining with a width of 0.5mm or less and having an electrode consumption ratio being high enough to allow a practical use is formed by a graphite material formed by mesocarbon microbeads with a grain size of 20mum or less serving as a raw material and having characteristics, e.g. density of 1.75g/cm or more, bending strength of 500-1300kgf/cm , electric ration resistance of 800-2000muOMEGAcm, and an anisotropic ratio of 1.05 or less and processed 0.5-0.03mm in thickness. The electrode is suitable for fine precision machining and an electrode consumption ratio can be sharply decreased. Further, even when a machining speed is increased, a granular protrusion is difficult to generate, and machining efficiency can be improved.

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