WO2001078923A1 - Metallische miniaturisierte hohle formkörper und verfahren zur herstellung derartiger formkörper - Google Patents
Metallische miniaturisierte hohle formkörper und verfahren zur herstellung derartiger formkörper Download PDFInfo
- Publication number
- WO2001078923A1 WO2001078923A1 PCT/DE2001/000761 DE0100761W WO0178923A1 WO 2001078923 A1 WO2001078923 A1 WO 2001078923A1 DE 0100761 W DE0100761 W DE 0100761W WO 0178923 A1 WO0178923 A1 WO 0178923A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- metallic
- shaped bodies
- reduced
- starting materials
- Prior art date
Links
Classifications
-
- 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
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1103—Making porous workpieces or articles with particular physical characteristics
- B22F3/1112—Making porous workpieces or articles with particular physical characteristics comprising hollow spheres or hollow fibres
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
- B22F1/0655—Hollow particles
-
- 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
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1143—Making porous workpieces or articles involving an oxidation, reduction or reaction step
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12181—Composite powder [e.g., coated, etc.]
Definitions
- the invention relates to metallic miniaturized hollow molded articles according to claim 1. Furthermore, the invention relates to a method for producing metallic miniaturized hollow molded articles according to the preamble of claim 7.
- hollow spheres are produced, since the necessary support elements in spherical form are usually easier to obtain. Instead of hollow spheres, however, all other types of support bodies can also be used. As a result, there are no hollow spheres, but hollow shaped bodies in the shape of the support bodies used in each case. In the present description, hollow spheres and hollow shaped bodies are basically understood as equivalents, insofar as the statements on the prior art do not actually relate to hollow spheres.
- US 3,674,461 specifies hollow spherical particles made of aluminum, magnesium, boron and beryllium which are free of holes and seams and whose diameter is less than about 4.5 mm, the wall thickness being less than about 0.2 mm.
- the respective material is built up on a core in the form of a powder coating. It is stated that the cores are filled into a rotating container in which there is a metered amount of the powdered coating material.
- the core consists, for example, of naphthalene, anthracene, camphor or polyaldehyde.
- the core is then sublimed in a vacuum over a longer period of time and removed in gaseous form through the coating.
- the remaining high Len balls for example made of aluminum, oxidized at temperatures between 700 and 800 ° C.
- shells are made from ceramics of the respective starting materials used.
- US 3,792,136 describes a process for producing highly porous hollow metal oxide balls from a metal oxide from the group consisting of silicon, aluminum, calcium, magnesium and zirconium oxide.
- a metal oxide from the group consisting of silicon, aluminum, calcium, magnesium and zirconium oxide.
- Epoxy resin ball with a diameter of 2 to 4 mm soaked with an oxidizable salt solution of the metal mentioned with ammonium hydroxide.
- the epoxy resin balls soaked with metal oxide are dried and carbonized. Thereafter, the spheres treated in this way are treated in an oxidizing atmosphere in such a way that the resin is driven off by decomposition and the carbon by oxidation and the intended metal oxide is formed.
- the metal oxide balls have an overall porous structure.
- DE 36 40 586 AI specifies a process for the production of hollow spheres or hollow spherical compounds with walls of increased strength. Additional layers are applied to metalized, spherical, light body particles with a core made of foamed polymer and a metal wall thickness of 5 to 20 ⁇ m.
- the metallized spherical light body particles are coated with a dispersion of fine metal, its oxide or fine ceramic or refractory material. The layer thickness should be 15 to 500 ⁇ m.
- the coated lightweight particles are dried, the polymer core is pyrolyzed at 400 ° C and then sintered at 900 to 1,400 ° C.
- EP 0 300 543 A1 describes a process for producing metallic or ceramic hollow spheres, in which a solid layer is applied to an essentially spherical particle made of foamed polymer and the coated polymer core is pyrolyzed.
- the spherical particles are treated while moving with an aqueous suspension which contains dissolved and suspended binders and metallic and / or ceramic powder particles.
- the coated and dried particles are pyrolyzed with agitation at 400 to 500 ° C and sintered at temperatures of 1,000 to 1,500 ° C with agitation.
- hollow spheres can be produced whose diameters are practically between 0.5 and 5 mm.
- Such hollow spheres can be used to produce completely sintered structures or molded parts which can be used in practice and whose mass can be reduced to 3%, preferably to 1%, of the mass of the solid material used in each case.
- the size of the powder particles used is of particular importance for the strength of the hollow spheres.
- the ratio of strength and lightness of hollow spheres and the structures made from them is essentially determined by the ratio of spherical knife and ball wall thickness determined.
- the optimal wall thickness of the hollow spheres should be about 0.5 to 3% of the outer diameter of the sphere. In most cases the wall thickness is around 1%.
- Hollow balls with a diameter of 5 mm then have a wall thickness of about 50 ⁇ m, with a ball diameter of 1 mm it is only 10 to 20 ⁇ m and with balls of 0.5 mm diameter it is only 5 to a maximum of 15 ⁇ m wall thickness.
- the minimum size of the styrofoam spheres used in practice as the carrier material, which determine the inner diameter of the hollow spheres, is limited to approximately 0.8 mm. Smaller styrofoam balls cannot be produced. The conditions are corresponding for carrier materials other than spherical. Coating the styrofoam balls increases their diameter even further. If hollow metallic spheres smaller than 0.8 mm are to be produced, non-foamed plastic spheres would have to be used. However, this increases the amount of plastic to be pyrolized so much that it is impossible to drive out the spherical core material in an economical and environmentally friendly manner.
- powder particles must be used that have considerably smaller external dimensions than the thickness of the hollow spherical wall. Otherwise, the powder particles can sinter within the wall structure only at a few lateral points of contact with one another.
- the average size of the powder particles should not be greater than 10% of the thickness of the spherical wall.
- the homogeneity of the hollow spherical structure is largely determined by the size of the hollow spheres.
- the practically achievable compressive strength and the homogeneity of the properties of sintered hollow spheres are limited by the size of the smallest available hollow spheres.
- the compressive strength of a hollow spherical composite can be increased by pressing, the density of the hollow spherical composite also increases in an undesirable manner and the basically desired lightweight construction effect is lost again.
- the invention is based on the object of specifying metallic miniaturized hollow molded articles, in particular for the advantageous use of such molded articles in structural components or semi-finished components with high compressive strength. Furthermore, the task is to specify a method with which metallic molded bodies can be produced.
- the invention solves the problem for the metallic miniaturized hollow shaped body by the features mentioned in the characterizing part of claim 1.
- the object for the method is achieved by the features mentioned in the characterizing part of claim 7.
- Advantageous further developments are characterized in the respective subclaims and are described in more detail below together with the description of the preferred embodiment of the invention.
- the miniaturized metallic hollow shaped bodies hereinafter simply called hollow spheres, consist of at least one heavy metal which is at a temperature below 1500 ° C., preferably below 1200 ° C., in a hydrogen or carbon-containing one Atmosphere can be reduced from a corresponding metal compound.
- Fe, Ni, Co, Sn, Mo, Cr, Cu, Ag, Pd and W are used in particular as such a heavy metal.
- the outer diameter of the metallic moldings is between 0.05 and 0.5 mm and the diameter / wall thickness ratio is between 0.5 and 3%.
- the individual metallic moldings can also be made of alloys of the metals mentioned and / or the walls of the moldings can be constructed in multiple layers from the same or different materials.
- the metallic miniaturized hollow molded bodies can be sintered in molded body assemblies to form components or semi-finished components.
- the shaped bodies according to the invention lead to a high number of sintered points in the sintered shaped body composite.
- the molded body composites are very homogeneous and have a very high compressive strength.
- the molded body composites can be machined well without cutting and the homogeneous structure also allows the use of joining methods such as screws and nails.
- the density of the shaped body assemblies is basically maintained. Depending on the selected diameter-wall thickness ratio, the density of the shaped body composites can be further reduced compared to the prior art.
- the surfaces of the molded dressings have a low roughness.
- the shaped bodies according to the invention cannot be produced using the means of the prior art.
- a new method according to the invention is therefore specified for the production of the novel metallic miniaturized hollow shaped bodies.
- a method according to the preamble of claim 7 is used for the production of metallic miniaturized hollow molded bodies, in which essentially reducible metal compounds, preferably metal oxides, metal hydroxides, metal carbonates or organometallic compounds (for example acetates) are used as starting materials for the structure of the shell layer on the carrier element , Formates, oxalates, acetyl acetonates) can be selected.
- the coated carrier elements are sintered with an envelope layer containing at least one such metal compound (as so-called green compacts) during the heat treatment in a reducing atmosphere in such a way that the starting materials are reduced to the metal on which the metal compound used is based.
- a cladding layer can also contain at least two compounds of different heavy metals, which form an alloy during sintering under reducing conditions.
- the cladding layer can be formed from several layers, the same metal compound (s) or also different metal compounds being able to be contained in the individual layers.
- the metal compounds can be used at least partially in colloidal form. It is also possible to use some of the metal compounds dissolved in a liquid, preferably water.
- the average particle size of reducible metal compounds as starting materials should be as far as possible below 5 ⁇ m, that is, they should also be present in liquid in colloidal form.
- the raw materials are often available as technical chemicals or as pigments for the paint industry in very small particle sizes, much cheaper than comparable metal powders.
- Iron oxides for use as a pigment are commercially available, for example, in the range from 500 nm to less than 100 nm. Compared to metals, many metal compounds are very brittle, so that they are inexpensive to use in ball mills average particle size in the range of 1 micron can be ground. This is not possible with metals due to their ductility.
- those with a diameter of less than 1 mm are regularly used as carrier elements.
- the material of the carrier elements is first pyrolyzed in a known manner and expelled from the balls.
- the metal compounds are converted into the respective metal on which the metal compound used is based in a reducing atmosphere.
- a reducing protective gas atmosphere such as hydrogen, ammonia cracked gas, exogas or endogas when sintering. It can also be used to reduce oxides that can arise during thermal decomposition to metal.
- the second, often stronger effect which is beneficial to increased shrinkage and thus the miniaturization is always of the fact that a metal compound ⁇ a lower specific gravity and thus a larger volume occupying than the metal itself.
- Fe 2 0 3 has a density of 5.2 g / cm 3 . It consists of 69.9% by mass of iron. From 100 cm 3 Fe 2 0 3 , only 46 cm 3 of metallic iron is produced by reduction.
- Nickel hydroxide has a density of 4.15 g / cm 3 . It consists of 63% by mass of nickel. Approx. 29 cm 3 of metallic nickel is produced from 100 cm 3 of nickel hydroxide by reduction.
- the respective material-specific degree of shrinkage can be calculated precisely in advance.
- the surface roughness of structures or components is significantly reduced. This creates surfaces that can usually be called smooth surfaces. Due to the smaller outer diameter of the hollow spheres, the structure of a hollow spherical composite is substantially more homogeneous overall and the mechanical properties are improved.
- the shaped body assemblies can be easily machined and non-cutting. For example, nails or screws can also be inserted.
- hollow iron balls are to be produced with an average diameter of approximately 0.5 mm and a wall thickness of approximately 10 ⁇ m.
- a coating layer is made up of 1 suspension of a suspension consisting of a liquid and a binder and a red color pigment of Fe 2 O 3 with an average particle size of 0.32 ⁇ m on 1 liter of styrofoam balls with an average diameter of 0.8 mm ,
- the thickness of the cladding layer is approximately 20 ⁇ m.
- the polystyrene balls coated in this way are referred to as green compacts.
- the diameter of the green compacts is approx. 0.84 mm and the volume has increased by approx. 10% from 1 liter to approx. 1.1 liters.
- the organic components of the green compact are burned out.
- the iron oxide is reduced and a sintered hollow sphere is formed.
- the approx. 1.1 liters of green compacts become approx. 0.6 liters of metallic iron hollow spheres with an average diameter of approx. 0.3 mm and a wall thickness of approx. 10 ⁇ m.
- a coating of a suspension consisting of a liquid in which a binder and nickel acetate are dissolved and a powder of nickel hydroxide is applied to 1 liter of polystyrene balls with an average diameter of 0.5 mm with an average particle size of 500 ⁇ m.
- the thickness of the shell layer is approximately 15 ⁇ m.
- the diameter of the green compacts is approx. 0.53 mm and the volume has increased from 1 liter to approx. 1.2 liters.
- the organic and other volatile constituents of the green body are burned out in inert gas and the nickel oxide formed is reduced during subsequent heat treatment in a hydrogen atmosphere at temperatures of 1120 ° C. and a sintered hollow nickel sphere is formed.
- the support body can be star-shaped, for example. These are advantageously produced by means of an extruder, the original extruder strand being subsequently cut up.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Powder Metallurgy (AREA)
- Forging (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001576213A JP2003531287A (ja) | 2000-04-14 | 2001-02-22 | 金属製小型中空形状体およびその製造方法 |
AU42286/01A AU4228601A (en) | 2000-04-14 | 2001-02-22 | Metallic miniaturized hollow shaped bodies and method for producing shaped bodies of this type |
AT01915064T ATE295767T1 (de) | 2000-04-14 | 2001-02-22 | Verfahren zur herstellung von metallischen hohlkörpern und hiernach hergestellte miniaturisierte hohlkörper |
EP01915064A EP1272300B1 (de) | 2000-04-14 | 2001-02-22 | Verfahren zur herstellung von metallischen hohlkörpern und hiernach hergestellte miniaturisierte hohlkörper |
DE50106257T DE50106257D1 (de) | 2000-04-14 | 2001-02-22 | Verfahren zur herstellung von metallischen hohlkörpern und hiernach hergestellte miniaturisierte hohlkörper |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10018501.0 | 2000-04-14 | ||
DE10018501A DE10018501C1 (de) | 2000-04-14 | 2000-04-14 | Metallische miniaturisierte hohle Formkörper und Verfahren zur Herstellung derartiger Formkörper |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001078923A1 true WO2001078923A1 (de) | 2001-10-25 |
Family
ID=7638727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/000761 WO2001078923A1 (de) | 2000-04-14 | 2001-02-22 | Metallische miniaturisierte hohle formkörper und verfahren zur herstellung derartiger formkörper |
Country Status (7)
Country | Link |
---|---|
US (1) | US20030077473A1 (de) |
EP (1) | EP1272300B1 (de) |
JP (1) | JP2003531287A (de) |
AT (1) | ATE295767T1 (de) |
AU (1) | AU4228601A (de) |
DE (2) | DE10018501C1 (de) |
WO (1) | WO2001078923A1 (de) |
Cited By (1)
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CN115945684A (zh) * | 2022-12-02 | 2023-04-11 | 中国核动力研究设计院 | 一种钨合金空心球及其制备方法和应用 |
Families Citing this family (27)
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---|---|---|---|---|
JP4616220B2 (ja) * | 2006-07-18 | 2011-01-19 | Jfeテクノリサーチ株式会社 | 中空金属体の製造方法 |
JP4641010B2 (ja) * | 2006-07-25 | 2011-03-02 | Jfeテクノリサーチ株式会社 | 中空金属体 |
DE102007005211B4 (de) | 2007-01-30 | 2010-03-11 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Verfahren zur Herstellung eines Verbundwerkstoffes |
DE102008006690B4 (de) * | 2008-01-25 | 2010-01-07 | Glatt Systemtechnik Gmbh | Gesinterter Hohlkörper |
US20100021721A1 (en) * | 2008-07-22 | 2010-01-28 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Composite material and method for the production of a composite material |
JP2011219830A (ja) * | 2010-04-12 | 2011-11-04 | Jfe Mineral Co Ltd | ニッケル微粒子、ニッケル微粒子混合物、および、導電性ペースト |
US10647618B2 (en) | 2014-09-19 | 2020-05-12 | Hrl Laboratories, Llc | Thermal and environmental barrier coating for ceramic substrates |
US9719176B2 (en) | 2013-09-20 | 2017-08-01 | Hrl Laboratories, Llc | Thermal barrier materials and coatings with low heat capacity and low thermal conductivity |
US10030292B2 (en) | 2014-05-26 | 2018-07-24 | Hrl Laboratories, Llc | Hydride-coated microparticles and methods for making the same |
US9738788B1 (en) | 2014-05-26 | 2017-08-22 | Hrl Laboratories, Llc | Nanoparticle-coated multilayer shell microstructures |
US10648082B1 (en) | 2014-09-21 | 2020-05-12 | Hrl Laboratories, Llc | Metal-coated reactive powders and methods for making the same |
US10682699B2 (en) | 2015-07-15 | 2020-06-16 | Hrl Laboratories, Llc | Semi-passive control of solidification in powdered materials |
US10502130B2 (en) | 2016-02-17 | 2019-12-10 | GM Global Technology Operations LLC | Composite thermal barrier coating |
US10927434B2 (en) | 2016-11-16 | 2021-02-23 | Hrl Laboratories, Llc | Master alloy metal matrix nanocomposites, and methods for producing the same |
US12012646B1 (en) | 2017-02-01 | 2024-06-18 | Hrl Laboratories, Llc | Additively manufacturing components containing nickel alloys, and feedstocks for producing the same |
US11674204B2 (en) | 2017-02-01 | 2023-06-13 | Hrl Laboratories, Llc | Aluminum alloy feedstocks for additive manufacturing |
US11779894B2 (en) | 2017-02-01 | 2023-10-10 | Hrl Laboratories, Llc | Systems and methods for nanofunctionalization of powders |
US20190032175A1 (en) | 2017-02-01 | 2019-01-31 | Hrl Laboratories, Llc | Aluminum alloys with grain refiners, and methods for making and using the same |
US11117193B2 (en) | 2017-02-01 | 2021-09-14 | Hrl Laboratories, Llc | Additive manufacturing with nanofunctionalized precursors |
US11052460B2 (en) | 2017-02-01 | 2021-07-06 | Hrl Laboratories, Llc | Methods for nanofunctionalization of powders, and nanofunctionalized materials produced therefrom |
US10960497B2 (en) | 2017-02-01 | 2021-03-30 | Hrl Laboratories, Llc | Nanoparticle composite welding filler materials, and methods for producing the same |
US11578389B2 (en) | 2017-02-01 | 2023-02-14 | Hrl Laboratories, Llc | Aluminum alloy feedstocks for additive manufacturing |
US11998978B1 (en) | 2017-02-01 | 2024-06-04 | Hrl Laboratories, Llc | Thermoplastic-encapsulated functionalized metal or metal alloy powders |
US11396687B2 (en) | 2017-08-03 | 2022-07-26 | Hrl Laboratories, Llc | Feedstocks for additive manufacturing, and methods of using the same |
US11286543B2 (en) | 2017-02-01 | 2022-03-29 | Hrl Laboratories, Llc | Aluminum alloy components from additive manufacturing |
US10851711B2 (en) | 2017-12-22 | 2020-12-01 | GM Global Technology Operations LLC | Thermal barrier coating with temperature-following layer |
US11865641B1 (en) | 2018-10-04 | 2024-01-09 | Hrl Laboratories, Llc | Additively manufactured single-crystal metallic components, and methods for producing the same |
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US3420645A (en) * | 1966-06-16 | 1969-01-07 | Corning Glass Works | Method for making hollow glass particle having a metallic copper coating |
US4775598A (en) * | 1986-11-27 | 1988-10-04 | Norddeutsche Affinerie Akitiengesellschaft | Process for producing hollow spherical particles and sponge-like particles composed therefrom |
EP0300543A1 (de) * | 1987-07-22 | 1989-01-25 | Norddeutsche Affinerie Ag | Verfahren zum Herstellen von metallischen oder keramischen Hohlkugeln |
US4925740A (en) * | 1989-07-28 | 1990-05-15 | Rohr Industries, Inc. | Hollow metal sphere filled stabilized skin structures and method of making |
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US3528809A (en) * | 1965-04-15 | 1970-09-15 | Canadian Patents Dev | Hollow article production |
US3792139A (en) * | 1972-08-09 | 1974-02-12 | Us Army | Process for flattening alumina substrates |
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US3975194A (en) * | 1974-03-04 | 1976-08-17 | Canadian Patents And Development Limited | Formation of hollow spherical articles |
US3997435A (en) * | 1975-10-29 | 1976-12-14 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method for selecting hollow microspheres for use in laser fusion targets |
US4637990A (en) * | 1978-08-28 | 1987-01-20 | Torobin Leonard B | Hollow porous microspheres as substrates and containers for catalysts and method of making same |
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DE3902032A1 (de) * | 1989-01-25 | 1990-07-26 | Mtu Muenchen Gmbh | Gesintertes leichtbaumaterial mit herstellungsverfahren |
DE19603196A1 (de) * | 1996-01-30 | 1997-08-07 | Hoechst Ag | Anorganische Hohlkugeln, Verfahren zu ihrer Herstellung und ihre Verwendung |
US6501784B1 (en) * | 1998-04-20 | 2002-12-31 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Thermal insulation to be inserted between two insulating structures |
-
2000
- 2000-04-14 DE DE10018501A patent/DE10018501C1/de not_active Expired - Fee Related
-
2001
- 2001-02-22 AU AU42286/01A patent/AU4228601A/en not_active Abandoned
- 2001-02-22 US US10/257,032 patent/US20030077473A1/en not_active Abandoned
- 2001-02-22 DE DE50106257T patent/DE50106257D1/de not_active Expired - Fee Related
- 2001-02-22 JP JP2001576213A patent/JP2003531287A/ja active Pending
- 2001-02-22 WO PCT/DE2001/000761 patent/WO2001078923A1/de active IP Right Grant
- 2001-02-22 EP EP01915064A patent/EP1272300B1/de not_active Expired - Lifetime
- 2001-02-22 AT AT01915064T patent/ATE295767T1/de not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3420645A (en) * | 1966-06-16 | 1969-01-07 | Corning Glass Works | Method for making hollow glass particle having a metallic copper coating |
US4775598A (en) * | 1986-11-27 | 1988-10-04 | Norddeutsche Affinerie Akitiengesellschaft | Process for producing hollow spherical particles and sponge-like particles composed therefrom |
EP0300543A1 (de) * | 1987-07-22 | 1989-01-25 | Norddeutsche Affinerie Ag | Verfahren zum Herstellen von metallischen oder keramischen Hohlkugeln |
US4925740A (en) * | 1989-07-28 | 1990-05-15 | Rohr Industries, Inc. | Hollow metal sphere filled stabilized skin structures and method of making |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115945684A (zh) * | 2022-12-02 | 2023-04-11 | 中国核动力研究设计院 | 一种钨合金空心球及其制备方法和应用 |
Also Published As
Publication number | Publication date |
---|---|
EP1272300A1 (de) | 2003-01-08 |
DE10018501C1 (de) | 2001-04-05 |
ATE295767T1 (de) | 2005-06-15 |
US20030077473A1 (en) | 2003-04-24 |
DE50106257D1 (de) | 2005-06-23 |
AU4228601A (en) | 2001-10-30 |
JP2003531287A (ja) | 2003-10-21 |
EP1272300B1 (de) | 2005-05-18 |
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