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1. 发明专利

JPH08290958A OXIDE-BASED REFRACTORY AND ITS PRODUCTION 失效
公开(公告)号：JPH08290958A
公开(公告)日：1996-11-05
申请号：JP9101095
申请日：1995-04-17
申请人： NIPPON STEEL CORP
发明人： NAKAO ATSUSHI , TAMURA SHINICHI
IPC分类号： C04B38/00 , C04B35/00 , C04B35/64
摘要： PURPOSE: To obtain an oxide-based refractory capable of suppressing a physical slug infiltration and excellent in heat impact resistance. CONSTITUTION: This oxide-based refractory has 5-50% apparent void ratio, and >=80% total voids have =80% total voids of

2. 发明专利

JPH06298565A CARBON-CONTAINING REFRACTORY 失效
公开(公告)号：JPH06298565A
公开(公告)日：1994-10-25
申请号：JP10593693
申请日：1993-04-09
申请人： NIPPON STEEL CORP
发明人： MATSUI TAKESHI , TAIRA HATSUO , NAKAO ATSUSHI
IPC分类号： C04B35/103 , C04B35/10
摘要： PURPOSE:To obtain a carbon-containing refractory having high strength and excellent thermal shock resistance by adding metallic Si to a refractory raw material composed of alumina and spherical carbon powder and baking the mixture in a nonoxidizing atmosphere. CONSTITUTION:The carbon-containing refractory is produced by adding 2-10wt.% of metallic Si to 100wt.% of a refractory raw material composed of 70-95wt.% of alumina and 5-30wt.% of spherical carbon powder and baking the mixture in a nonoxidizing atmosphere. The alumina to be used in the process contains 15-30wt.% of particles having a diameter of 74-150mum, 35-50wt.% of particles having a diameter of 10-74mum and 20-50wt.% of particles having a diameter of

3. 发明专利

JPH06287053A CARBON-CONTAINING REFRACTORY MATERIAL 失效
公开(公告)号：JPH06287053A
公开(公告)日：1994-10-11
申请号：JP9510793
申请日：1993-03-31
申请人： NIPPON STEEL CORP
发明人： NAKAO ATSUSHI , TAIRA HATSUO , MATSUI TAKESHI
IPC分类号： C04B35/00 , C04B35/632
摘要： PURPOSE:To inexpensively, improve strength, oxidation resistance and corrosion resistance without lowering thermal shock resistance by blending a mixture of a refractory raw material and graphite with a given amount of a mesophase pitch as a molding binder. CONSTITUTION:A main component comprising a refractory raw material such as naturally-occurring alumina having 90wt.% purity and a graphite such as artificial graphite having >=90wt.% purity is blended with metal powder to produce nitride, etc., by reaction, a carbide to form an oxide by reaction and glass powder such as borosilicate glass to give a mixture. Then 100 pts.wt. of the mixture is mixed with 1-30wt.% of a mesophase pitch such as coal-based mesophase pitch as a molding binder in the ratio of the mesophase pitch: the graphite as the main component of 1:1-3 to give a blend. Then the blend is kneaded, molded and dried to produce a carbon-containing refractory material.

4. 发明专利

JPH06277813A REFRACTORY FOR CONTINUOUS CASTING NOZZLE 失效
公开(公告)号：JPH06277813A
公开(公告)日：1994-10-04
申请号：JP9377193
申请日：1993-03-30
申请人： NIPPON STEEL CORP
发明人： NAKAO ATSUSHI , TAIRA HATSUO , MATSUI TAKESHI
IPC分类号： B22D11/10 , C04B35/00
摘要： PURPOSE:To provide a refractory for continuous casting nozzle excellent in thermal shock resistance. CONSTITUTION:(1) The refractory for continuous casting nozzle, in which a composition of, by weight, 3-40% graphite and 60-97% refractory is added with 3-30% the metal powder to generate an interstitial carbide of carbon (MC), subjecting to mixing, forming and firing. (2) The refractory for continuous casting nozzle, in which a composition of, by weight, 3-40% graphite and 60-97% refractory is added with the metal powder and powder of Al or Si to generate an interstitial carbide of carbon (MC), subjecting to mixing, forming and firing. By this method, production costs such as cost reduction of nozzle for continuous casting, relaxation of preheating condition, etc., is reduced.

5. 发明专利

JPH06116047A CARBON CONTAINING MONOLITHIC REFRACTORY 失效
公开(公告)号：JPH06116047A
公开(公告)日：1994-04-26
申请号：JP28709992
申请日：1992-10-02
申请人： NIPPON STEEL CORP
发明人： TAKEUCHI KAZUHIKO , TAIRA HATSUO , NAKAO ATSUSHI , MATSUI TAKESHI
IPC分类号： C04B35/66
摘要： PURPOSE:To obtain a carbon containing monolithic refractory excellent in corrosion resistance and oxidation resistance and capable of obtaining a dense worked body by using a novel raw material as a supply source of carbon component. CONSTITUTION:This carbon containing monolithic refractory contains one kind or >=2 kinds of main minerals constituting the refractory such as magnesia, alumina, silicon carbide as a main component and 0.5-20.0wt.% spherical carbon particle. The spherical carbon particle has preferably 2-500mum particle diameter and >=98% fixed carbon content. Even by jointly using 10-100wt.% carbon containing binder per the using quantity of the spherical carbon particle, the same effect is also obtained. An organic compound liquid at a kneading temp. such as tar, pitch, mesophase pitch, phenol resin is cited as the carbon containing binder.

6. 发明专利

JPH0672758A CARBON-CONTAINING BASIC REFRACTORY 失效
公开(公告)号：JPH0672758A
公开(公告)日：1994-03-15
申请号：JP24888292
申请日：1992-08-26
申请人： NIPPON STEEL CORP , KUROSAKI REFRACTORIES CO
发明人： NAKAO ATSUSHI , GOTO KIYOSHI , TAIRA HATSUO , SURUGA TOSHIHIRO , KAWASAKI KAZUHIKO
IPC分类号： C04B35/00 , C04B35/04 , C04B35/043
摘要： PURPOSE:To improve oxidation resistance and spalling resistance by blending respectively a specific quantity of graphite, a basic refractory raw material, metal Al and metal Ti. CONSTITUTION:A raw material blended material is obtained by blending 3-30wt.% graphite such as an artificial graphite, 60-94wt.% basic refractory such as an electromelting magnesia having high purity, large bulk density and crystal size, 3-10wt.% sum of metal Al and metal Ti having high purity and

7. 发明专利

JPH05294762A 失效
公开(公告)号：JPH05294762A
公开(公告)日：1993-11-09
申请号：JP12538992
申请日：1992-04-20
申请人： NIPPON STEEL CORP
发明人： MATSUI TAKESHI , TAIRA HATSUO , TAKEUCHI KAZUHIKO , NAKAO ATSUSHI
IPC分类号： C04B35/103 , C04B35/71 , C04B41/49 , C04B41/85
摘要： PURPOSE:To improve oxidation resistance by impregnation treating a refractory, obtained by kneading each of a specific quantity of an Al2O3 fire-proofing raw material, a SiC fire-proofing raw material and graphite, molding and firing in a non-oxidizing atmosphere at a prescribed temp., with Mg alkoxide. CONSTITUTION:The Al2O3 fire-proofing raw material of 60-90 pts.wt. (hereafter pts.) having >=95% purity, the SiC fire-proofing raw material of 5-20 pts. having >=90% purity and graphite of 5-20 pts. having >=90% purity where particle diameter of these raw materials is =600 deg.C. After that, Mg-alkoxide is impregnated into the fired material, uniformly dispersed inside of the fired material and heat treated to form MgO which forms a magnesium-aluminum spinel by allowing to react with Al2O3 in the fired material and the carbon-containing refractory excellent in corrosion resistance and oxidation resistance is obtained.

8. 发明专利

JPH05286755A 失效
公开(公告)号：JPH05286755A
公开(公告)日：1993-11-02
申请号：JP11244892
申请日：1992-04-06
申请人： NIPPON STEEL CORP
发明人： TAKEUCHI KAZUHIKO , TAIRA HATSUO , NAKAO ATSUSHI , MATSUI TAKESHI
IPC分类号： C04B35/101 , C04B35/84 , C04B41/50 , C04B41/82 , C04B41/85 , C04B35/10
摘要： PURPOSE:To provide a high alumina brick being uniform and having a stronger binding comparing with a conventional one, in a high alumina brick used for a wall lining inside an atmospheric furnace not in contact with a molten material. CONSTITUTION:A brick compsn. having a chemical composition consisting of 50.0-99.8wt.% Al2O3 and the balance of at least a kind of oxide, such as SiO2, Fe2O3, etc., is impregnated with a metallic magnesium alkoxide and is fired at 1400 deg.C. In this way, as a binding at particle boundary is strengthened, a high temperature strength or a thermal impact resistance is remarkably improved.

9. 发明专利

JPH05286752A 失效
公开(公告)号：JPH05286752A
公开(公告)日：1993-11-02
申请号：JP11318292
申请日：1992-04-07
申请人： NIPPON STEEL CORP
发明人： NAKAO ATSUSHI , TAIRA HATSUO , TAKEUCHI KAZUHIKO , MATSUI TAKESHI
IPC分类号： C04B35/047 , C04B35/04 , C04B41/82 , C04B41/85
摘要： PURPOSE:To obtain basic refractories having a uniform and dense structure and high corrosion resistance by impregnating a magnesia-chrome refractory molded form with titanium alkoxide and burning the same. CONSTITUTION:Basic refractories are obtained by impregnating a magnesiachrome refractory molded form with titanium alkoxide and burning the same. Gaseous hydrocarbon and steam are volatilized during burning. Titanium alkoxide impregnated into the inside of the magnesia-chrome refractory molded form produces very fine titania crystal. The titania crystal is uniformly dispersed in the insides of pores infiltrated with titanium alkoxide. The produced fine titania particles react with the constitutional components of the refractories during burning of the refractories and thereby 2MgO.TiO2, MgO.TiO2 and MgO.2TiO2 are produced. The structure of magnesia-chrome refractories is made dense by performing liquid phase sintering reaction at >=1600 deg.C.

10. 发明专利

JPH05286751A 失效
公开(公告)号：JPH05286751A
公开(公告)日：1993-11-02
申请号：JP11318192
申请日：1992-04-07
申请人： NIPPON STEEL CORP
发明人： NAKAO ATSUSHI , TAIRA HATSUO , TAKEUCHI KAZUHIKO , MATSUI TAKESHI
IPC分类号： C04B35/047 , C04B35/04 , C04B41/82 , C04B41/85
摘要： PURPOSE:To obtain basic refractories having a uniform and dense structure and high corrosion resistance by impregnating magnesia-chrome refractories with zirconium alkoxide. CONSTITUTION:Basic refractories are obtained by impregnating magnesiachrome refractories with zirconium alkoxide. Gaseous hydrocarbon and steam are volatilized by performing heat treatment. Zirconium alkoxide impregnated into the inside of the magnesia-chrome refractories produces very fine zirconia crystal. The zirconia crystal is uniformly dispersed in the insides of pores infiltrated with zirconium alkoxide and fills the pores to make the structure dense. Furthermore, fine zirconia particles present in the insides of the pores react with slag infiltrated during the use of refractories and viscosity of slag is raised. Infiltration of slag is inhibited. In such a way, the service life of magnesia-chrome refractories is prolonged by inhibiting infiltration of slag which is accompanied by making the structure dense and raising the viscosity of slag.

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