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1. 发明专利

JPH05286768A 失效
公开(公告)号：JPH05286768A
公开(公告)日：1993-11-02
申请号：JP8516092
申请日：1992-04-07
申请人： KAWASAKI REFRACTORIES CO LTD , KAWASAKI STEEL CO
发明人： IIDA MASAKAZU , YAMAMURA TAKU
IPC分类号： C04B35/581 , C04B35/58 , C04B35/64
摘要： PURPOSE:To provide a method for producing aluminum nitride sintered compacts by which the amts. of both oxygen and carbon in compacts to be fired can considerably be reduced and aluminum nitride sintered compacts having >3mm uniform thickness are obtd. CONSTITUTION:When aluminum nitride-based ceramic 3 is heated to the sintering temp. in a firing furnace 1, it is held at a certain holding temp. during heating and the pressure of the internal atmosphere of the furnace is increased after the holding process. Thus, the objective aluminum nitride sintered compacts are produced.

2. 发明专利

JPH0426556A ALN SINTERED COMPACT 失效
公开(公告)号：JPH0426556A
公开(公告)日：1992-01-29
申请号：JP12929190
申请日：1990-05-21
申请人： KAWASAKI STEEL CO
发明人： YAMAMURA TAKU , UENOSONO SATOSHI , MAEDA EIZO , YOKOI MAKOTO , KUMAGAI MASATO
IPC分类号： C04B35/581 , C04B35/58
摘要： PURPOSE:To obtain an AlN base with high thermal conductivity of >=190W/mK capable of being produced by means of pressureless sintering excellent in productivity and free from abnormal external appearance by providing an AlN sintered compact in which the composition of a grain boundary phase consists of Y4Al2O9 and Y2O3. CONSTITUTION:This sintered compact is an AlN sintered compact in which grain boundary phase consists of Al2O3 and Y2O3 and the composition of this grain boundary phase consists of Y4Al2O9 and Y2O3. The above-mentioned sintered compact can be produced in a proper nitrogen flow in proper temp. conditions, depending on the additive quantities of oxygen, carbon, and Y2O3 in an AlN green compact after removal of binder. It is necessary that the grain boundary phase of the sintered compact has a composition consisting of Y4Al2O9 and Y2O3, and further, it is preferable that the mole ratio between Al2O3 and Y2O3 in the composition of the grain boundary phase is regulated to 0.1-0.30 or 0.4-0.5. It is preferable that, in the AlN powder to be used, mean grain size and the amount of oxygen incorporated in the powder are regulated to 1-2mu and =99.9% purity and

3. 发明专利

JPH02275765A PRODUCTION OF SINTERED ALUMINUM NITRIDE 失效
公开(公告)号：JPH02275765A
公开(公告)日：1990-11-09
申请号：JP9538589
申请日：1989-04-17
申请人： KAWASAKI STEEL CO
发明人： NAKANO TADASHI , YOKOI MAKOTO , KANAMARU TAKAO , MEGA TETSUYA , YAMAMURA TAKU , FUNABASHI TOSHIHIKO , KUMAGAI MASATO
IPC分类号： C04B35/581 , C04B35/58
摘要： PURPOSE:To produce a sintered AIN having dense texture and high thermal conductivity and electrical resistance and suitable as an insulation substrate, at a low cost, by adding a specific sintering assistant to AIN powder, forming the mixture and calcining in a non-oxidizing atmosphere. CONSTITUTION:The objective sintered AIN is produced by mixing 100 pts.wt. of AIN powder with (A) 0.05-5 pts.wt. (in terms of oxide) of one or more components selected from Y, Sc and lanthanoid and (B) 0.01 to 5 pts.wt. of one or more elements selected from metallic Li, metallic Be, metallic Mg, B, Si, S, P, As and metallic Zn, forming the mixture and calcining at 1400 to 2000 deg.C in a non-oxidizing atmosphere.

4. 发明专利

JPH08210783A FLAME SPRAYING REPAIRING MATERIAL AND FLAME SPRAYING REPAIRING METHOD 失效
公开(公告)号：JPH08210783A
公开(公告)日：1996-08-20
申请号：JP6588595
申请日：1995-03-24
申请人： KAWASAKI STEEL CO
发明人： YAMAMURA TAKU , FUKUSHIMA YASUMASA , WATANABE SEIJI , KUMAGAI MASATO , TAGUCHI SEIJI
IPC分类号： F27D1/16
摘要： PURPOSE: To provide an economical and superior flame spraying repairing material and a flame spraying repairing method in which either a minute characteristic or adhering characteristic of a refractory material repairing layer at a refractory damaged location in a furnace or the like and the refractory material may not be damaged by a repairing work. CONSTITUTION: A repairing work is carried out at a temperature of 700 deg.C or more of a refractory material surface temperature by applying flame spraying repairing material in which this is a mixed powder of easy-oxidized metallic particles and refractory oxidized material particles, a particle diameter range distribution rate of the refractory oxidized powder is 1.2 or lower, a particle diameter corresponding to 10% of a calculated mass rate of the refractory oxidized powder is in a range of particle diameter corresponding to 20 to 50% of a calculated mass rate of the easy oxidized metallic powder and a maximum particle diameter of the easy oxidized metallic powder is less than a particle diameter corresponding to 90% of a calculated mass rate of the refractory oxidized powder material.

5. 发明专利

JPH04292471A PRODUCTION OF ALN-BASED SINTERED COMPACT 失效
公开(公告)号：JPH04292471A
公开(公告)日：1992-10-16
申请号：JP5234491
申请日：1991-03-18
申请人： KAWASAKI STEEL CO
发明人： MAEDA EIZO , UENOSONO SATOSHI , UDAGAWA ETSURO , KANAMARU TAKAO , YAMAMURA TAKU , YOKOI MAKOTO , KUMAGAI MASATO
IPC分类号： C04B35/581 , C04B35/58 , C04B35/638 , C04B35/64
摘要： PURPOSE:To obtain an AlN sintered compact having a high thermal conductivity and a smooth surface by increasing temperature at a heating rate so as to provide the oxygen content in the AlN sintered compact within a desired range and degreasing the aforementioned sintered compact. CONSTITUTION:A sintering assistant such as Y2O3 and a binder are added to AlN powder and kneading and forming of the prepared mixture are carried out. The temperature of the resultant compact is subsequently increased at a desired heating rate (A) in an atmosphere of N2 to produce a decreased compact (B). In the process, the relation between the rate (A) and the residual carbon content (C) in the component (B) is predetermined and the oxygen content (D) of the AlN sintered compact obtained by degreasing is obtained. Heating, degreasing and sintering are then performed at the rate (A) so as to provide the component (D) within a desired range. Thereby, the objective AlN sintered compact, having 1.8-3.2 wt.% content of Y2O3 and the grain boundary phase composition other than inevitably contained impurities exhibiting a relation expressed by the formula [the molar ratio of (x/y) is 0.08 =150 W/mK, a low surface roughness and a smooth and homogeneous surface is produced.

6. 发明专利

JPH04292470A PRODUCTION OF ALN-BASED SINTERED COMPACT 失效
公开(公告)号：JPH04292470A
公开(公告)日：1992-10-16
申请号：JP5234791
申请日：1991-03-18
申请人： KAWASAKI STEEL CO
发明人： MAEDA EIZO , UENOSONO SATOSHI , UDAGAWA ETSURO , KANAMARU TAKAO , YAMAMURA TAKU , YOKOI MAKOTO , KUMAGAI MASATO
IPC分类号： C04B35/581 , C04B35/58
摘要： PURPOSE:To obtain an AlN sintered compact having a high thermal conductivity and a smooth and homogeneous surface by determining the oxygen content in a produced AlN sintered compact and adding Al2O3 in an amount corresponding to the extent of deviation to a raw material before the next forming if the content is deviated to the side of a low oxygen content. CONSTITUTION:A sintering assistant and a binder are added to AlN powder and disintegration, kneading and forming of the prepared mixture are carried out. The resultant compact is subsequently degreased in an atmosphere of N2 to produce a decreased compact, which is then burned in an N2 gas stream to produce the objective AlN sintered compact. The oxygen content in the produced AlN sintered compact is subsequently measured. If the measured oxygen content is deviated to the side of a lower value than a desired oxygen content, Al2O3 in an amount corresponding to the above-mentioned extent of deviation is added to the aforementioned raw material before forming in the next production. Treatment is then carried out in the same manner as that in the preceding time to afford the AlN sintered compact having the desired oxygen content. The resultant AlN sintered compact is preferably used as substrates, etc., for loading IC.

7. 发明专利

JPH04193765A PRODUCTION OF ALUMINUM NITRIDE SUBSTRATE 失效
公开(公告)号：JPH04193765A
公开(公告)日：1992-07-13
申请号：JP31808190
申请日：1990-11-26
申请人： KAWASAKI STEEL CO
发明人： UDAGAWA ETSURO , MAEDA EIZO , YAMAMURA TAKU , KUMAGAI MASATO , FUNABASHI TOSHIHIKO
IPC分类号： C04B35/581 , C04B35/58
摘要： PURPOSE:To improve thermal conductivity, electrical insulating property and stability of appearance by sustaining a definite temp. in the case of calcining an AlN substrate in the temp. increasing stage of the calcining temp. pattern and accelerating the decarburization. CONSTITUTION:To an AlN powder consisting of 0.5-1.0wt.% oxygen as impurity and

8. 发明专利

JPH04193764A CALCINATION OF ALUMINUM NITRIDE SUBSTRATE 失效
公开(公告)号：JPH04193764A
公开(公告)日：1992-07-13
申请号：JP31807990
申请日：1990-11-26
申请人： KAWASAKI STEEL CO
发明人： UDAGAWA ETSURO , MAEDA EIZO , YAMAMURA TAKU , KUMAGAI MASATO , FUNABASHI TOSHIHIKO
IPC分类号： C04B35/581 , C04B35/58
摘要： PURPOSE:To improve thermal conductivity, electrical insulating property and stability of appearance by disposing a gaseous oxygen-releasing substance releasing oxygen with decomposition and evaporation thereof to the neighborhood of an aluminum nitride articles to be calcined and executing calcination under controlling the calcining atmosphere. CONSTITUTION:To aluminum nitride powder consisting of 0.5-1.0wt.% oxygen and 1.2wt.% oxygen content and at least one or two kinds of substrate 10 releasing gaseous oxygen by decomposition and evaporation thereof, selected from alumina-boron nitride composite sintered body incorporating 40-60wt.% of aluminum are disposed, and covered with lid 7 via spacer 6 and executed high temp. calcining while blowing gaseous nitrogen 5 from the outside.

9. 发明专利

JPH0248408A PRODUCTION OF ALUMINUM NITRIDE POWDER 失效
公开(公告)号：JPH0248408A
公开(公告)日：1990-02-19
申请号：JP19880088
申请日：1988-08-11
申请人： KAWASAKI STEEL CO
发明人： YAMAMURA TAKU , KUMAGAI MASATO , YOSHII YUTAKA , UCHIMURA RYOJI
IPC分类号： C01B21/072
摘要： PURPOSE:To obtain fine powder of AlN having narrow particle size distribution range and low residual carbon content by adding a specific amount of alpha-alumina powder to a mixture of an alpha-amlumina precursor and a carbon source substance, drying the mixture and calcining in an N2-containing non-oxidizing atmosphere. CONSTITUTION:An alpha-alumina precursor such as boemite or Al salt is homogeneously mixed with a carbon source substance and the mixture is added with alpha-alumina powder having an average particle diameter of

10. 发明专利

JPH09263818A METHOD FOR LINING CONVERTER BRICK 失效
公开(公告)号：JPH09263818A
公开(公告)日：1997-10-07
申请号：JP7171296
申请日：1996-03-27
申请人： KAWASAKI STEEL CO
发明人： TAKAHASHI KATSUNORI , YAMAMURA TAKU , KUMAGAI MASATO , TAGUCHI SEIJI , SHIMIZU MASUHITO , SUZUKI HAJIME
IPC分类号： C21C5/44 , F27D1/16
摘要： PROBLEM TO BE SOLVED: To restrain the occurrence of spalling of brick of a conical part at the lower part in a furnace while keeping stirring of molten steel at the time of steelmaking and to prolong the service life of the furnace lining by specifying the angle of the conical part and the number of steps in the conical part at the time of lining the bricks in the converter. SOLUTION: The lower part of the furnace is formed as the conical shape for promoting the stirring of the molten steel. At the time of lining the conical part by a horizontal laying method, the angle X of the conical part is defined as >=45 deg. and the number of steps Y is made to satisfy the condition of the following formula Y -1.3X+20, wherein, X is the angle of the conical part and Y is the number of steps. In the case of the 230ton capacity pure oxygen blowing converter, the furnace satisfying this condition can prolong the service life of the furnace refractory by 9-15% in comparison with the furnace unsatisfying this condition. Also, as the brick, MgO-C brick added with 3% Al is used.

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