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1. 发明专利

JPH11286703A IRON POWDER FOR HIGH PERMEABILITY GREEN COMPACT MAGNETIC CORE AND ITS PRODUCTION 失效
公开(公告)号：JPH11286703A
公开(公告)日：1999-10-19
申请号：JP9155998
申请日：1998-04-03
申请人： KAWASAKI STEEL CO
发明人： UNAMI SHIGERU , OZAKI YUKIKO , OGURA KUNIAKI
IPC分类号： B22F1/00 , B22F9/22 , H01F1/20
摘要： PROBLEM TO BE SOLVED: To obtain a high magnetic permeability without bringing a cost increase on deterioration of moldability upon an iron powder by specifying the strain quantity evaluated by the half-value width of an αFe (200) peak by X-ray diffraction to a specific value or below and the average crystal grains size to a specified value or above. SOLUTION: The strain quantity of the iron powder evaluated by the half- value width of the αFe (200) peak by the X-ray diffraction is =10 μm. The sponge iron of >=0.35 deg of the strain quantity evaluated by the half-value width of the αFe (200) peak by the X-ray diffraction is adequately used as feed sponge iron in order to efficiently produce such iron powder. The energy introduced by the pulverization of such feed sponge iron acts as driving force for restoration and recrystallization at the time of finish reduction, thereby decreasing the strain quantity of the product iron powder and growing the crystal grains. The pulverizing machine used for pulverization includes an ordinary ball mill, etc. The finish reduction annealing is preferably executed under conditions of 800 to 950 deg.C and 20 to 120 minutes.

2. 发明专利

JPH1150103A PRODUCTION OF IRON POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JPH1150103A
公开(公告)日：1999-02-23
申请号：JP20330897
申请日：1997-07-29
申请人： KAWASAKI STEEL CO , MITSUBISHI MATERIALS CORP
发明人： UENOSONO SATOSHI , OGURA KUNIAKI , YOU SEKIHIN
IPC分类号： B22F9/08 , B22F1/00
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an iron powder for powder metallurgy, capable of producing a sintered compact having machinability and sliding characteristic more excellent than heretofore and a sintered compact containing alloying elements, having high strength, capable of straightening after sintering, and excellent in machinability and sliding characteristic. SOLUTION: A powder of B-containing compound, such as boric acid(H3 BO3 ), boron oxide(B2 O3 ), and boron nitride(BN), is added to an atomized iron powder having a composition consisting of, by weight, 0.003-0.30% S, 0.05-0.40% Mn, and the balance Fe with inevitable impurities by 0.001 to 0.3 wt.% expressed in terms of B based on the total amount of the iron power, and these are mixed and heat-treated in a reducing atmosphere. Prealloyed Ni and Mo can be added to the atomized iron powder. Further, Ni, Mo, and Cu can be partially alloyed at the surface of the iron powder by adding and mixing a powder containing Ni, Mo, and Cu.

3. 发明专利

JPH10317001A IRON-BASE POWDER MIXTURE FOR POWDER METALLURGY, EXCELLENT IN FLOWABILITY AND COMPACTIBILITY, ITS PRODUCTION, AND PRODUCTION OF GREEN COMPACT 失效
公开(公告)号：JPH10317001A
公开(公告)日：1998-12-02
申请号：JP7100098
申请日：1998-03-19
申请人： KAWASAKI STEEL CO
发明人： OZAKI YUKIKO , UENOSONO SATOSHI , OGURA KUNIAKI
IPC分类号： C10M105/24 , B22F1/00 , B22F1/02 , B22F3/02 , C10M105/68 , C10M127/04 , C10M131/00 , C10M139/00 , C10M139/04 , C10M155/02 , C10M159/04 , C10M171/06 , C10N10/08 , C10N20/06 , C10N30/08 , C10N40/24 , C10N40/36 , C10N50/08 , C10N70/00
摘要： PROBLEM TO BE SOLVED: To provide an iron-base powder mixture for powder metallurgy, excellent in warm flowability as well as in flowabiity at room temp., capable of reducing extracting force at the tin of compaction, and improved in compactibility, its production, and production of a high density green compact. SOLUTION: In the iron-base powder mixtuie containing an iron-base powder, a lubricant, and an alloying powder. one or more kinds selected from the iron- base powder, the lubricant, and the alloying powder are coated, desirably, with a surface treating agent consisting of one or more kinds selected from organoalkoxysilane, organosilazane, titanate-type coupling agent, and fluorine- type coupling agent. It is more desirable that the iron-base powder mixture contains the lubricant melted and sticking to the iron-base powder, the alloying powder adhering to the iron-base powder via the lubricant and the liberated lubricant powder. This iron-base powder mixture is press-compacted at the temp. not lower than the lowest melting point of the contained lubricant and lower than the highest melting point of the lubricant.

4. 发明专利

JPH09263802A IRON-BASED POWDER MIXTURE FOR POWDER METALLURGY AND ITS PRODUCTION 失效
公开(公告)号：JPH09263802A
公开(公告)日：1997-10-07
申请号：JP7773496
申请日：1996-03-29
申请人： KAWASAKI STEEL CO
发明人： UENOSONO SATOSHI , OZAKI YUKIKO , OGURA KUNIAKI
IPC分类号： B22F1/00 , B22F3/02
摘要： PROBLEM TO BE SOLVED: To stabilize the apparent density and fluidity of a powder mixture, to decrease segregation and to prevent contamination on the inner wall of a furnace due to ZnO during calcination by limiting the amt. of zinc stearate added as a lubricant and using lithium stearate as a part of the lubricant. SOLUTION: First, one or more kinds of material (A) is mixed by 0.1 to 1.0wt.% with an alloy powder and/or a powder to improve machinability and an iron-based powder, and then heated to a temp. higher by 10 to 100 deg.C than the melting point of a binder. The material (A) is such a one that can be molten by heating and is selected from stearic acid, amide oleate, a mixture of amide oleate and ethylene amide bis-stearate, and ethylene amide bis stearate. Then the molten material is cooled, to which 0.3 to 5wt.% powder of the material (A) 0.01 to 0.15wt.% zinc stearate powder and 0.05 to 0.35wt.% lithium stearate powder are added and mixed to obtain an iron-based powder mixture. The binder is prepared by adding a lubricant to oleic acid, spindle oil, and turbine oil.

5. 发明专利

JPH07188703A ATOMIZING IRON POWDER FOR POWDER METALLURGY AND ITS PRODUCTION 失效
公开(公告)号：JPH07188703A
公开(公告)日：1995-07-25
申请号：JP32947193
申请日：1993-12-27
申请人： KAWASAKI STEEL CO
发明人： UENOSONO SATOSHI , UNAMI SHIGERU , OGURA KUNIAKI
IPC分类号： B22F1/00
摘要： PURPOSE:To produce atomizing iron powder for powder metallurgy capable of affording powder metallurgical product having excelent machinability by atomizing molten steel contg. specified ratios of S, Mn and O, subjecting it to finish reduction under specified conditions and incorporating oxygen into the specified ratio of the number of MnS grains. CONSTITUTION:Molten steel contg., by weight, 0.05 to 0.25% S, 0.05 to 0.5% Mn and >=100ppm oxygen, and the balance Fe with inevitable impurities is atomized. Next, it is subjected to finish reduction at >=950 deg.C in a hydrogen atmosphere having >=430 deg.C dew point to prepare atomizing iron powder in which >=5% of the number of MnS grains contains oxygen. Thus, the atomizing iron powder for powder metallurgy excellent in compressibility and easily capable of affording a sintered compact excellent in machinability and tensile strength at the time of sintering can be produced.

6. 发明专利

JPH04198407A SINTERED METAL MOLD AND PRODUCTION THEREOF 失效
公开(公告)号：JPH04198407A
公开(公告)日：1992-07-17
申请号：JP32590090
申请日：1990-11-29
申请人： KAWASAKI STEEL CO , MITSUBISHI MOTORS CORP
发明人： ENDO KAZUYA , KONO MASAKI , OGURA KUNIAKI , SUZUKI KATSUO
IPC分类号： B22C9/06 , B22F3/26 , B22F5/00 , B22F5/10
摘要： PURPOSE:To obtain a sintered metal mold having a cooling path along the vicinity of the surface of the mold and put to practical use by forming a cavity for cooling with an inner wall deposited by the infiltration of an infiltrating material. CONSTITUTION:A first infiltrating material similar in shape to a cooling path is set at a position at which the cooling path is formed in a metal mold and iron-based metal powder is filled under vibration to form a filled layer. A second infiltrating material is put on the filled layer and the casting mold, the iron- based metal powder, the first and the second infiltrating materials are heated to the sintering temp. of the iron-based metal powder. Sintering and infiltration are accelerated and a sintered metal mold having the desired cooling path is obtd. The surface of the mold is made uniform and flat and the mold having superior cooling ability is obtd. in a short infiltration time. The first and the second infiltrating materials are required only to melt at the sintering temp. of the iron-based metal powder or below and they may be made of the same material.

7. 发明专利

JPH0317203A MANUFACTURE OF POWDER METALLURGICAL PRODUCT 失效
公开(公告)号：JPH0317203A
公开(公告)日：1991-01-25
申请号：JP15038289
申请日：1989-06-15
申请人： KAWASAKI STEEL CO
发明人： KONO MASAKI , OGURA KUNIAKI , TAKAGI SHIGEAKI
IPC分类号： B22F1/00 , B22F3/11 , B22F5/00 , C22C47/14
摘要： PURPOSE:To manufacture a powder metallurgical product having excellent strength and good surface characteristic in a short time by packing ferrous powder having the specific particle diameter distribution into a forming die, sintering and infiltrating the remaining cavity in the solid sintered by with metal having m.p. lower than that of the above body. CONSTITUTION:The ferrous powder is packed into the forming die of ceramic having large high temp. strength under dry state and vibration is applied to improve the density. The remaining cavity in the sintered body is infiltrated with the metal of copper, zinc, etc., having m.p. lower than that of the sintered body. At the time of manufacturing this powder metallurgical product, the particle size constitution of the above ferrous powder is made 3-25wt.% fine particle powder of 15-150mum, further of which >=35% consists of >63mum based on the medium particle powder, 30-60% course particle powder of >250-1000mum, further of which >=35% consists of >500mum based on the course particle powder, and >=90% in total of the above for the total of product. By this method, the dimensional shrinkage at the time of sintering is restricted and the product having excellent strength in the shortened process and the surface roughness easily improvable by grinding of a short time, is obtd.

8. 发明专利

JPH01312056A MANUFACTURE OF SINTERED COMPACT OF ALLOY STEEL HAVING HIGH DENSITY AND HIGH STRENGTH 失效
公开(公告)号：JPH01312056A
公开(公告)日：1989-12-15
申请号：JP14056488
申请日：1988-06-09
申请人： KAWASAKI STEEL CO
发明人： MARUTA KEIICHI , TAKAGI SHIGEAKI , OGURA KUNIAKI , FURUKIMI OSAMU
IPC分类号： B22F1/02 , C22C33/02
摘要： PURPOSE:To manufacture a sintered compact of alloy steel having high density and high strength by mixing a composite alloy powder in which the surface of iron-powder grains is coated with Ni and a graphite powder with other additives, compacting the resulting mixture, and then subjecting the resulting green compact to temporary sintering, recompacting, and resintering. CONSTITUTION:The surface of iron-powder grains is coated with Ni, and, if necessary, the above surface is further coated with Cu. The above coatings are carried out by means of electroless plating using respective solutions of NiSO4 and CuSO4, CVP, PVD, etc., and suitable additive quantities of Ni and Cu are, by weight, about 0.2-15% and about 0.2-10%, respectively. The resulting composite alloy powder and about 0.1-1.2% graphite powder are mixed together with other alloying elements and other additives, such as lubricant. This mixture is compacted in a metal mold at about 4-8t/cm compacting pressure, and this green compact is sintered at 700-1000 deg.C. The resulting temporarily sintered compact is recompacted in a metal mold at a pressure of about 5-10t/cm to increase density and then resintered at >=1100 deg.C. By this method, the alloying elements can be diffused without causing segregation, and the sintered compact of alloy steel having high density and high strength can be obtained.

9. 发明专利

JPH01142002A ALLOY STEEL POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JPH01142002A
公开(公告)日：1989-06-02
申请号：JP29948687
申请日：1987-11-27
申请人： KAWASAKI STEEL CO
发明人： OTA JUNICHI , OGURA KUNIAKI , TAKAGI SHIGEAKI
IPC分类号： B22F1/00 , C22C38/00 , C22C38/12
摘要： PURPOSE:To obtain alloy steel powder for powder metallurgy, which is simply possible to manufacture a sintered body having high density by specifying composition of Mo, W and Fe and composition of particle size in the powder. CONSTITUTION:The alloy steel for powder metallugy having alloy composing of one or two kinds of 1.5-2.0wt.% Mo, 3.0-20% W and containing in the range of 1.5 =15% of 10-44mum, 5-20% of 100-250mum particle size, is prepared. Further, the fine particle having under size of 250mum is not used as raw material powder. The above alloy steel powder can be manufactured as the high density sintered body without coating surface of the powder green compact. This alloy steel powder is obtd. by adjusting the particle size after reducing, annealing and pulverizing the pre-alloyed steel powder having the prescribed composition manufactured by water atomizing method.

10. 发明专利

JPH01132701A ALLOY STEEL POWDER FOR POWDER METALLURGY 失效
公开(公告)号：JPH01132701A
公开(公告)日：1989-05-25
申请号：JP19052988
申请日：1988-08-01
申请人： KAWASAKI STEEL CO
发明人： OGURA KUNIAKI , OTA JUNICHI , ABE TERUNOBU , TAKAGI SHIGEAKI
IPC分类号： C22C38/00 , B22F1/00 , C22C38/44 , C22C38/54
摘要： PURPOSE:To obtain alloy steel having excellent compressive property and to manufacture a sintered part having high strength and high density by sticking powder of one or more kinds of Ni, Cu, Mo, W on the surface of raw material of alloy steel powdered particles containing Cr to make the prescribed composition of it. CONSTITUTION:This alloy steel powder for powder metallurgy is formed by partially diffusing and sticking the fine powder of one or more kinds of Ni, Cu, Mo, W on the surface of the raw material of the alloy steel powdered particles containing Cr. The above alloy steel powder for powder metallurgy contains 0.1-5wt.% Cr, 0.1-10% Ni, 0.1-10% Cu, 0.1-5% Mo, 0.1-5% W and the balance Fe. Further, it is limited to

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