专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH111701A FINISH HEAT TREATMENT FOR IRON POWDER 失效
公开(公告)号：JPH111701A
公开(公告)日：1999-01-06
申请号：JP15348997
申请日：1997-06-11
申请人： KAWASAKI STEEL CO
发明人： OGURA KUNIAKI , MARUTA KEIICHI , ISHIKAWA HIROYUKI , SUZUKI YOSHIKAZU
IPC分类号： B22F1/00
摘要： PROBLEM TO BE SOLVED: To improve the productivity of a finish heat treatment of raw material powder. SOLUTION: In the finish heat treatment of iron powder using one or more kinds of the heat treatments among each heat treatment of deoxidation, decarburization and denitrification, after adding the moisture by 0.5-20 wt.% to the raw material before adding the moisture. As the moisture, acid solution containing 0.1 wt.% to

2. 发明专利

JPH06136404A PRODUCTION OF IRON-BASE SOFT MAGNETIC MATERIAL SINTERED COMPACT 失效
公开(公告)号：JPH06136404A
公开(公告)日：1994-05-17
申请号：JP28981592
申请日：1992-10-28
申请人： KAWASAKI STEEL CO
发明人： SUZUKI HIDEO , OTSUBO HIROSHI , MAKIISHI YUKIO , MARUTA KEIICHI
IPC分类号： B22F1/00 , B22F3/02 , B22F3/10 , C22C33/02
摘要： PURPOSE:To inexpensively and precisely produce the soft magnetic sintered parts of pure iron or Fe-P having a good DC magnetic characteristic by injection-molding a metal powder. CONSTITUTION:In the case of producing an iron-base soft magnetic material sintered compact by injection-molding a metal powder, the powders of iron and iron oxide having

3. 发明专利

JPH04362103A PRODUCTION OF STAINLESS STEEL SINTERED BODY 失效
公开(公告)号：JPH04362103A
公开(公告)日：1992-12-15
申请号：JP16341991
申请日：1991-06-10
申请人： KAWASAKI STEEL CO
发明人： OTSUBO HIROSHI , MARUTA KEIICHI
IPC分类号： B22F1/00 , C22C1/04 , C22C33/02
摘要： PURPOSE:To produce the stainless steel sintered body having good dimensional accuracy and high density by adding iron powder under specific conditions to water-atomized stainless steel powder having specific average grain sizes under specific condition and molding and sintering the mixture. CONSTITUTION:The iron powder having 1 to 15mu grain sizes is added at 1 to 20 pts.wt. to 100 pts.wt. water atomized stainless steel powder which is so adjusted in contents of Cr, Ni, Mo, etc., as to attain the target values of the chemical compsn. and has 1 to 20mu average grain sizes. The mixture is then molded and sintered. The stainless steel sintered body with which the deformation at the time of sintering is prevented is produced in this way.

4. 发明专利

JPH03247743A SINTERED ALLOY STEEL EXCELLENT IN CORROSION RESISTANCE, MACHINABILITY AND MIRROR FINISHING PROPERTY AND ITS MANUFACTURE 失效
公开(公告)号：JPH03247743A
公开(公告)日：1991-11-05
申请号：JP4486090
申请日：1990-02-26
申请人： KAWASAKI STEEL CO
发明人： MARUTA KEIICHI , KIYOTA SADAKIMI , OTSUBO HIROSHI
IPC分类号： C22C33/02 , C22C38/00 , C22C38/60
摘要： PURPOSE:To manufacture a sintered alloy steel excellent in corrosion resistance, machinability and mirror finishing properties by forming steel powder with specified grain size having a specified compsn. constituted of Cr, Ni, Mo, Mn, S, Se, Te and Fe and thereafter executing specified sintering. CONSTITUTION:Steel powder contg., by weight, 16 to 25% Cr, 8 to 24% Ni, =92% density ratio and excellent in machinability can be obtd. without deteriorating its corrosion resistance and mirror finishing properties.

5. 发明专利

JPH03173702A PRODUCTION OF SINTERED BODY 失效
公开(公告)号：JPH03173702A
公开(公告)日：1991-07-29
申请号：JP31212489
申请日：1989-11-30
申请人： KAWASAKI STEEL CO
发明人： OTSUBO HIROSHI , KIYOTA SADAKIMI , MARUTA KEIICHI
IPC分类号： B22F3/10 , B22F3/02
摘要： PURPOSE:To easily control the amts. of carbon and oxygen in a sintered body by molding a mixture of metal powder with a binder, heat-treating the molded body in wet hydrogen or in an atmosphere contg. oxygen and then sintering the molded body under reduced pressure. CONSTITUTION:A molded body obtd. by kneading metal powder such as iron- based powder with a binder is heated in a nonoxidizing atmosphere or under reduced pressure or heated under reduced pressure and further heated in a nonoxidizing atmosphere to remove the binder. The molar ratio between carbon and oxygen in the molded body is regulated by heat treatment in wet hydrogen or in an atmosphere contg. oxygen and then the molded body is sintered under reduced pressure. The metal powder is preferably powder of an iron alloy contg. one or more among Cr, Mo, V, Ni and Si.

6. 发明专利

JPH01165702A MANUFACTURE OF ALLOY STEEL SINTERED COMPACT HAVING HIGH DENSITY AND HIGH STRENGTH 失效
公开(公告)号：JPH01165702A
公开(公告)日：1989-06-29
申请号：JP32380387
申请日：1987-12-23
申请人： KAWASAKI STEEL CO
发明人： TAKAGI SHIGEAKI , OGURA KUNIAKI , FURUKIMI OSAMU , MARUTA KEIICHI
IPC分类号： B22F3/16 , B22F1/02 , C22C33/02
摘要： PURPOSE:To easily form an alloy steel sintered compact having high density and high strength by mixing graphite powder and iron powder coated with Cu on surface with the other raw material powder, compacting and carrying out secondary-sintering by re-pressurizing after temporary-sintering. CONSTITUTION:With complexed powder of the iron powder granule coated with Cu on the surface and the graphite powder, lubricant of zinc stearate, etc., is mixed and compacted in the die. This green compact is temporary- sintered at 700-1,000 deg.C. The temporary sintered compact is sintered at >=1,100 deg.C after making high density by repressurizing in the die to obtain the alloy steel sintered compact. By this method, the density of the sintered compact is enhanced, and the mechanical characteristics are improved.

7. 发明专利

JPH10306301A FINISH HEAT TREATMENT FOR IRON POWDER 失效
公开(公告)号：JPH10306301A
公开(公告)日：1998-11-17
申请号：JP11224597
申请日：1997-04-30
申请人： KAWASAKI STEEL CO
发明人： SUZUKI YOSHITOMO , MINEGISHI TOSHIYUKI , MARUTA KEIICHI
IPC分类号： B22F9/22 , B22F1/00
摘要： PROBLEM TO BE SOLVED: To provide a method of finish heat treatment for an iron powder, capable of accelerating, more effectively than heretofore, decarburizing reaction according to the quality of a raw material and improving productivity. SOLUTION: A magnetic medium 4 and a water nozzle 5 are disposed on the inlet side of a finish heat treatment furnace 6. In a state where a magnetic field is applied to as tacked raw material, water in an amount corresponding to the amount of C in the raw material is added only in the case where the amount of C in the raw material is at the prescribed value or above, and then, finish heat treatment is applied to the raw material. By this method, the reaction interface of an iron powder can be enlarged, and reactions of oxidation [Fe+H2 O→FeO+H2 ] and decarburization.reduction [FeO+C→CO+Fe] are induced, and decarburization in the inner part of an iron powder layer 10 can be accelerated to a greater extent.

8. 发明专利

JPH10280001A PRODUCTION OF STEEL POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JPH10280001A
公开(公告)日：1998-10-20
申请号：JP9176997
申请日：1997-04-10
申请人： KAWASAKI STEEL CO
发明人： MARUTA KEIICHI , OGURA KUNIAKI
IPC分类号： B22F9/08 , B22F1/00
摘要： PROBLEM TO BE SOLVED: To produce water-atomized steel powder for powder metallurgy at low cost by reducing the numer of processes and improving the reactivity by atomizing molten steel containing a specific quantity of C with water, dehydrating the obtd. steel powder into a prescribed moisture content and executing the finish-heat treatment in reducing atmosphere under the wet state. SOLUTION: The molten steel containing

9. 发明专利

JPH10265803A PRODUCTION OF FERROUS POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JPH10265803A
公开(公告)日：1998-10-06
申请号：JP8892897
申请日：1997-03-24
申请人： KAWASAKI STEEL CO
发明人： MARUTA KEIICHI , OGURA KUNIAKI
IPC分类号： B22F9/08 , B22F1/00
摘要： PROBLEM TO BE SOLVED: To obtain ferrous powder for powder metallurgy at a low cost by spraying molten steel contg. a specific ratio or below of C by water atomization and drying this powder at a specific temp. range in a nonoxidizing atmosphere, then subjecting the powder to a finish reduction heat treatment in an H2 reducing atmosphere of a specific dew point. SOLUTION: The content of the C in the molten steel is confined to >=0.07 wt.%, by which the hardness at the section of atomized green powder is decreased and the annealing load at the time of the finish treatment is decreased. The powder is dried at 100 to 300 deg.C in the nonoxidizing atmosphere of Ar, N2 , H2 or the gaseous mixture composed thereof, by which the increase of the oxygen quantity in the powder is suppressed. The dew point of the H2 reducing atmosphere (pure H2 or an atmosphere mixture composed of the H2 and the inert gas) in the finish reduction heat treatment is specified to 20 to 45 deg.C. The temp. of the finish reduction heat treatment is preferably specified to 800 to 1,100 deg.C and the finish reduction time to 60 to 180 minutes.

10. 发明专利

JPH09170002A IRON POWDER FINISH HEAT-TREATING METHOD AND DEVICE THEREFOR 失效
公开(公告)号：JPH09170002A
公开(公告)日：1997-06-30
申请号：JP27075096
申请日：1996-10-14
申请人： KAWASAKI STEEL CO
发明人： MARUTA KEIICHI , ISHIKAWA HIROYUKI , OGURA KUNIAKI
IPC分类号： B22F1/00 , F27B9/04
摘要： PROBLEM TO BE SOLVED: To improve the gas permeability of a raw-powder bed and to improve heat-treating efficiency in the finish heat treatment of iron powder by incorporating moisture into the raw powder while impressing a magnetic field. SOLUTION: An iron powder being a raw powder 7 is supplied to a belt 9 from a raw material hopper 8 and sent to a heat-treating furnace 20. A magnetic field generator 12 having a magnet as a counter electrode is set above and below the belt 9 between the furnace 20 and hopper 8 to impress a magnetic field on the raw powder 7. The pipeline 13 of a moisture feeder is furnished directly below the magnetic field generator 12, and moisture is supplied to the raw powder 7 impressed with the magnetic field. The furnace 20 is divided by a partition wall 1 into a decraburization zone 2, a deoxidation zone 3 and a denitrification zone 4, and one or >=2 kinds of heat treatments are conducted in each zone. An aq. soln of an acid such as carbonic acid, formic acid, acetic acid, benzoic acid and oxalic acid consisting only of C, O and H is preferably used as the moisture to be incorporated. The magnetic field to be impressed on the raw powder 7 is preferably controlled to about 1000 gauss at the bottom of the raw powder 7 bed and to about 200 gauss on the surface.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式