EP0871791B1 - Verfahren zur Herstellung von Laufbuchsen - Google Patents
Verfahren zur Herstellung von Laufbuchsen Download PDFInfo
- Publication number
- EP0871791B1 EP0871791B1 EP96930115A EP96930115A EP0871791B1 EP 0871791 B1 EP0871791 B1 EP 0871791B1 EP 96930115 A EP96930115 A EP 96930115A EP 96930115 A EP96930115 A EP 96930115A EP 0871791 B1 EP0871791 B1 EP 0871791B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thick
- tube
- walled tube
- hot deformation
- walled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 230000008569 process Effects 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 13
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 claims abstract description 11
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims description 22
- 229910045601 alloy Inorganic materials 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 11
- 239000011856 silicon-based particle Substances 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000004898 kneading Methods 0.000 claims description 3
- 239000011225 non-oxide ceramic Substances 0.000 claims description 2
- 229910052575 non-oxide ceramic Inorganic materials 0.000 claims description 2
- 239000011224 oxide ceramic Substances 0.000 claims description 2
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 2
- 239000011863 silicon-based powder Substances 0.000 claims 1
- 238000009785 tube rolling Methods 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000011164 primary particle Substances 0.000 description 3
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0408—Light metal alloys
- C22C1/0416—Aluminium-based alloys
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/123—Spraying molten metal
Definitions
- the invention relates to a method for producing liners for internal combustion engines a heat resistant and wear resistant hypereutectic Al - Si alloy.
- Liner bushings are components that are subject to wear and tear and that enter the cylinder openings of the The crankcase of the internal combustion engine can be inserted, pressed in or cast in.
- the cylinder running surfaces of an internal combustion engine are subject to severe friction stress the piston or through the piston rings and locally occurring high temperatures exposed. It is therefore necessary that these surfaces be made of wear-resistant and heat-resistant Materials exist.
- the surface of the To provide cylinder bore with wear-resistant coatings there are numerous processes, the surface of the To provide cylinder bore with wear-resistant coatings.
- Another possibility consists of placing a liner made of a wear-resistant material in the cylinder.
- Gray cast iron bushings used, but one in comparison to aluminum materials have low thermal conductivity and have other disadvantages.
- the problem was initially solved by a cast cylinder block from a hypereutectic AlSi alloy solved.
- the silicon content is for casting reasons limited to a maximum of 20% by weight.
- Another disadvantage of the casting process is note that during the solidification of the melt silicon primary particles with relatively large dimensions (approx. 30 - 80 ⁇ m) can be eliminated. Due to the Size and their angular and sharp-edged shape lead to wear on pistons and Piston rings. One is therefore forced through the pistons and the piston rings to protect appropriate coatings / coatings. The contact area of the Si particles the piston / piston ring is leveled by mechanical processing.
- hypereutectic AlSi alloys can be produced, which are due to the high Si content, the fineness of the Si particles and the homogeneous distribution a very have good wear resistance and through additional elements such as Fe, Ni or Mn get the required heat resistance.
- the Si primary particles present in these alloys have a size of approx. 0.5 to 20 ⁇ m. So that's how they are Alloys made suitable for a liner material.
- EP-A-411 577 and WO 87/03012 describe the spray compacting of hollow cylinders, the so-called Pipe blanks, known, according to EP-A the tube blanks are made of a hypereutectic Al-Si alloy. For example, the manufacture of pipe blanks with wall thicknesses from 25 to 40 mm. To thin-walled when forming such tube blanks Pipes e.g. extrusion causes the same problems described above
- the object of the invention is therefore an improved and far Cost-effective method for the production of thin-walled tubes, in particular for To provide cylinder liners of internal combustion engines, the manufactured liners with regard to the required property improvements Wear resistance, heat resistance and reduction of pollutant emissions should.
- the object is achieved by a method having the method described in claim 1 specified process steps solved.
- the required tribological properties are achieved in particular by the fact that Silicon particles as primary precipitates in a size range from 0.5 to 20 ⁇ m, or as added particles in a size range up to 80 ⁇ m in the material.
- Si particles as primary precipitates in a size range from 0.5 to 20 ⁇ m, or as added particles in a size range up to 80 ⁇ m in the material.
- methods must be used which allow a much higher rate of solidification of a high-alloy melt than with conventional casting process is possible.
- spray compacting For The desired properties are achieved using a high-alloy aluminum alloy melt atomized and in a nitrogen jet with a cooling rate of Cooled down to 1000 ° C / s.
- the partially still liquid powder particles are placed on a horizontal around the longitudinal axis rotating support tube made of a similar material or a conventional aluminum material (e.g. AlMgSi0.5) sprayed.
- the carrier tube which preferably has wall thicknesses of 2 - 3 mm, becomes linear during the process the spray jet shifted.
- By superimposing the rotation and the Translational movement of the carrier tube creates a cylindrical tube with a fixed given inner diameter.
- the outside diameter results from the Feed rate and the effective compacting rate. That way you can Tubes with wall thicknesses of 6 to 20 mm can be produced.
- suitable feed and Guiding systems for the carrier tubes can be a quasi-continuous production operation can be achieved.
- the spray compacting process also offers the possibility of introducing particles into the bolt via a particle injector that were not present in the melt. Since these particles can have any geometry and any size between 2 ⁇ m and 400 ⁇ m, there are a variety of setting options for a structure. These particles can be, for example, Si particles in the range from 2 ⁇ m to 400 ⁇ m or oxide-ceramic (for example Al 2 O 3 ) or non-oxide-ceramic particles (for example SiC, B 4 C, etc.) in the aforementioned particle size range, as are commercially available and for the tribological Aspect make sense.
- oxide-ceramic for example Al 2 O 3
- non-oxide-ceramic particles for example SiC, B 4 C, etc.
- the structural state of the spray-compacted pipe can be determined by subsequent Aging anneals can be changed. Through annealing, the structure can be reduced to one Si grain size of 2 to 30 microns can be set as required for the tribological Properties is desirable.
- the growth of larger Si particles during the Annealing process is caused by diffusion in the solid at the expense of smaller Si particles. This diffusion depends on the aging temperature and the duration of the Annealing treatment. The higher the temperature, the faster the Si grains grow. Suitable temperatures are around 500 ° C, with an annealing time of 3-5 Hours is sufficient.
- Hot forming (different methods are possible) a reduction in the wall thickness to the required gauge blocks reached.
- the process temperatures are preferably between 300 ° C and 500 ° C. Thereby, hot forming is not only used for forming, but also for Closure of the process-related residual porosity (1 - 5%) in the spray-compact Source material.
- the pipe formed to the end wall thickness is then cut into pipe sections required length divided.
- the inventive method has the advantage that the material for the liner can be tailored. At the same time, the high level of effort involved in Extrusion of thin-walled tubes both in terms of baling pressure and Press speed as well as product quality and economy through the described Production method successfully avoided.
- An alloy of the composition AlSi25Cu2.5Mg1Ni1 is at a melt temperature of 830 ° C with a gas / metal ratio of 4.5m 3 / kg (standard cubic meters of gas per kilogram of melt) by spray compacting on a carrier tube (inner diameter: 69.5 mm, wall thickness : 2.0 mm) at a feed rate of approx. 0.6 m / min to a tube with a wall thickness of 15.0 mm.
- the Si precipitates exist in the size range from 1 ⁇ m to 10 ⁇ m under the conditions mentioned.
- the spray-compacted tube is subjected to an annealing treatment of 4 hours at 520 ° C.
- the Si deposits are in the size range from 2 ⁇ m to 30 ⁇ m.
- the spray-compacted tube is formed from an outside diameter of 98 mm to an outside diameter of 79 mm and an inside diameter of 69 mm, which is formed by a mandrel. The degree of deformation is sufficient to completely close the aforementioned residual porosity in the spray-compacted tube. No other structural change occurs during the round kneading.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Powder Metallurgy (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Insulators (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19532252A DE19532252C2 (de) | 1995-09-01 | 1995-09-01 | Verfahren zur Herstellung von Laufbuchsen |
DE19532252 | 1995-09-01 | ||
PCT/EP1996/003780 WO1997009459A1 (de) | 1995-09-01 | 1996-08-28 | Verfahren zur herstellung von dünnen rohren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0871791A1 EP0871791A1 (de) | 1998-10-21 |
EP0871791B1 true EP0871791B1 (de) | 2000-11-29 |
Family
ID=7770982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96930115A Expired - Lifetime EP0871791B1 (de) | 1995-09-01 | 1996-08-28 | Verfahren zur Herstellung von Laufbuchsen |
Country Status (13)
Country | Link |
---|---|
US (2) | US6136106A (ja) |
EP (1) | EP0871791B1 (ja) |
JP (1) | JP3664315B2 (ja) |
KR (1) | KR100258754B1 (ja) |
CN (1) | CN1066493C (ja) |
AT (1) | ATE197821T1 (ja) |
BR (1) | BR9610546A (ja) |
DE (2) | DE19532252C2 (ja) |
DK (1) | DK0871791T3 (ja) |
ES (1) | ES2152560T3 (ja) |
GR (1) | GR3035368T3 (ja) |
PT (1) | PT871791E (ja) |
WO (1) | WO1997009459A1 (ja) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19621264B4 (de) * | 1996-05-25 | 2005-09-15 | Mahle Gmbh | Verfahren zur Herstellung einer Zylinderbüchse |
DE19643029A1 (de) * | 1996-10-18 | 1998-04-23 | Bayerische Motoren Werke Ag | Verfahren zum Beschichten eines aus einer Aluminium-Legierung bestehenden Bauteils einer Brennkraftmaschine mit Silicium |
DE19731804A1 (de) * | 1997-07-24 | 1999-01-28 | Bayerische Motoren Werke Ag | Herstellverfahren für eine Zylinderbüchse einer Brennkraftmaschine |
EP1017948A1 (de) * | 1997-09-15 | 2000-07-12 | Alusuisse Technology & Management AG | Zylinderlaufbuchse |
DE19750686C1 (de) * | 1997-11-15 | 1999-09-23 | Ks Aluminium Technologie Ag | Verfahren zum Herstellen einer Zylinderlaufbuchse |
DE10104638A1 (de) * | 2001-02-02 | 2002-08-22 | Thyssen Krupp Automotive Ag | Verfahren zur Herstellung von Bauteilen für Flugtriebwerke und stationäre Gasturbinen |
DE10235911B3 (de) * | 2002-08-06 | 2004-04-15 | Peak-Werkstoff Gmbh | Gussverbund von Hohlprofilen aus Leichtmetall-Legierung und Verfahren zu seiner Herstellung |
DE10239522B4 (de) * | 2002-08-23 | 2016-02-11 | Leica Geosystems Ag | Halteeinrichtung für ein optisches Element |
DE102006023690A1 (de) * | 2006-05-19 | 2007-11-22 | Schaeffler Kg | Verfahren zur Herstellung eines Wälzlagerbauteils sowie Wälzlagerbauteil |
DE102006051544A1 (de) * | 2006-11-02 | 2008-05-08 | Schaeffler Kg | Wälzlagerbauteil mit wälzfester Oberfläche und schwingungsdämpfendem Kern, sowie Verfahren zu dessen Herstellung |
DE102007003135B3 (de) * | 2007-01-16 | 2008-03-06 | Peak Werkstoff Gmbh | Verfahren zur Herstellung eines Zylinderkurbelgehäuses mit mehreren Zylinderlaufbuchsen sowie kurze Zylinderlaufbuchse mit daran festgelegtem Materialstreifen |
EP2289042A4 (en) * | 2008-05-30 | 2016-01-27 | Sky Castle Global Ltd | PROCESS AND SYSTEM FOR PROVIDING ONLINE SERVICES AND SOFTWARE |
US20100089315A1 (en) * | 2008-09-22 | 2010-04-15 | Applied Materials, Inc. | Shutter disk for physical vapor deposition chamber |
US20100224290A1 (en) * | 2009-03-09 | 2010-09-09 | Honda Motor Co., Ltd. | Aluminum alloy casting and method for producing the same, and apparatus for producing slide member |
DE102012006121A1 (de) * | 2012-03-26 | 2013-09-26 | Erbslöh Aluminium Gmbh | Lotpulver |
US9845764B2 (en) * | 2015-03-31 | 2017-12-19 | Achates Power, Inc. | Cylinder liner for an opposed-piston engine |
CN107058739B (zh) * | 2017-01-22 | 2018-08-07 | 哈尔滨理工大学 | 一种过共晶铝硅复合材料及其制造方法、应用 |
CN107813104B (zh) * | 2017-09-07 | 2019-02-01 | 马鞍山市新马精密铝业股份有限公司 | 汽车气弹簧用铝合金组合管件的制造方法 |
CN108842041A (zh) * | 2018-07-13 | 2018-11-20 | 宁国市正兴耐磨材料有限公司 | 一种可用于研磨强氧化性材料的多层耐磨球及其制备方法 |
CN114683535B (zh) * | 2020-12-28 | 2024-08-27 | 扬诚精密医材股份有限公司 | 三维打印设备 |
CN114669617B (zh) * | 2022-05-27 | 2022-08-26 | 江苏中天科技股份有限公司 | 一种特耐热铝合金耐张管材 |
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-
1995
- 1995-09-01 DE DE19532252A patent/DE19532252C2/de not_active Expired - Fee Related
-
1996
- 1996-08-28 BR BR9610546A patent/BR9610546A/pt not_active IP Right Cessation
- 1996-08-28 KR KR1019980701213A patent/KR100258754B1/ko not_active IP Right Cessation
- 1996-08-28 EP EP96930115A patent/EP0871791B1/de not_active Expired - Lifetime
- 1996-08-28 AT AT96930115T patent/ATE197821T1/de active
- 1996-08-28 PT PT96930115T patent/PT871791E/pt unknown
- 1996-08-28 ES ES96930115T patent/ES2152560T3/es not_active Expired - Lifetime
- 1996-08-28 JP JP51082697A patent/JP3664315B2/ja not_active Expired - Fee Related
- 1996-08-28 US US09/029,767 patent/US6136106A/en not_active Expired - Lifetime
- 1996-08-28 WO PCT/EP1996/003780 patent/WO1997009459A1/de active IP Right Grant
- 1996-08-28 DK DK96930115T patent/DK0871791T3/da active
- 1996-08-28 CN CN96196545A patent/CN1066493C/zh not_active Expired - Fee Related
- 1996-08-28 DE DE59606173T patent/DE59606173D1/de not_active Expired - Lifetime
-
2000
- 2000-03-01 US US09/516,804 patent/US6485681B1/en not_active Expired - Fee Related
-
2001
- 2001-02-06 GR GR20010400195T patent/GR3035368T3/el unknown
Also Published As
Publication number | Publication date |
---|---|
DK0871791T3 (da) | 2000-12-27 |
US6485681B1 (en) | 2002-11-26 |
WO1997009459A1 (de) | 1997-03-13 |
US6136106A (en) | 2000-10-24 |
CN1194014A (zh) | 1998-09-23 |
DE19532252C2 (de) | 1999-12-02 |
KR19990043982A (ko) | 1999-06-25 |
DE19532252A1 (de) | 1997-03-06 |
ES2152560T3 (es) | 2001-02-01 |
JP3664315B2 (ja) | 2005-06-22 |
GR3035368T3 (en) | 2001-05-31 |
JPH11501991A (ja) | 1999-02-16 |
ATE197821T1 (de) | 2000-12-15 |
PT871791E (pt) | 2001-03-30 |
EP0871791A1 (de) | 1998-10-21 |
DE59606173D1 (de) | 2001-01-04 |
BR9610546A (pt) | 1999-07-06 |
CN1066493C (zh) | 2001-05-30 |
KR100258754B1 (ko) | 2000-06-15 |
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