WO1991012881A1 - Procede et dispositif de conditionnement d'une poudre - Google Patents

Procede et dispositif de conditionnement d'une poudre Download PDF

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Publication number
WO1991012881A1
WO1991012881A1 PCT/EP1991/000315 EP9100315W WO9112881A1 WO 1991012881 A1 WO1991012881 A1 WO 1991012881A1 EP 9100315 W EP9100315 W EP 9100315W WO 9112881 A1 WO9112881 A1 WO 9112881A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder
oxide
pressure plasma
low
ceramics
Prior art date
Application number
PCT/EP1991/000315
Other languages
German (de)
English (en)
Inventor
Stefan Schulz
Wolfgang MÖHL
Original Assignee
Krauss Maffei Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Krauss Maffei Ag filed Critical Krauss Maffei Ag
Publication of WO1991012881A1 publication Critical patent/WO1991012881A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
    • B01J19/122—Incoherent waves
    • B01J19/126—Microwaves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/087—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
    • B01J19/088—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
    • 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
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/102—Metallic powder coated with organic material
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/14—Methods for preparing oxides or hydroxides in general
    • C01B13/145—After-treatment of oxides or hydroxides, e.g. pulverising, drying, decreasing the acidity
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/10—Non-chemical treatment
    • C03B37/14—Re-forming fibres or filaments, i.e. changing their shape
    • C03B37/15—Re-forming fibres or filaments, i.e. changing their shape with heat application, e.g. for making optical fibres
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J2219/0894—Processes carried out in the presence of a plasma

Definitions

  • inorganic powders are used, from which canen is mixed in a mixture with up to about 20% by weight of organic auxiliaries.
  • This route via green bodies is chosen because the green body can be given a desired shape, while the raggedly honey to extreme extreme hardness of the end product prevents post-processing.
  • the organic auxiliaries are removed from the green cores by prying out, whereby end products with irreversible windows can be obtained. It is obvious that for these Fenler i.a. the rneological properties of the mixture of inorganic powder and organic auxiliary materials can be appropriately demonstrated.
  • the object of the invention is now to provide a method with which powders can be conditioned in such a way that there is no segregation of the organic component which is necessary for shaping and with which the proportion of the organic auxiliary can be nero-set.
  • the object of the invention is also a device for
  • a method for conditioning a powder in which the powder is exposed to a low-pressure plasma in the presence of a polymerizable organic and / or organometallic monomer.
  • the procedure according to the invention achieves a coating of the discrete powder particles or a distribution of the polymer formed on the powders.
  • the polymer formed by plasma polymerization is deposited on the discrete particles from the gasonase, preferably in the area of the standard. This polymer can be seen as one of the finishes used to impart adhesion.
  • an optimal improvement of the rheological flow properties of ceramic materials e.g.
  • silicon powder including the required inorganic sintering additives (e.g. AI 2 O 3 ) for injection molding and hot isostatic pressing.
  • AI 2 O 3 required inorganic sintering additives
  • the homogeneity and thus the strength, density and resistance to oxidation of ceramic components with complex geometry is directly dependent on the rheological flow properties of the starting materials during the shaping process of the so-called green compacts.
  • Tecnnik for low-pressure plasmas can be found, for example, in Rutscher & Deutsch, Plasma Technology, Carl-Hanser-Verlag
  • the low pressure plasma is ignited or maintained in a low pressure atmosphere which consists of the desired monomer to be polymerized or comprises this monomer.
  • the monomer can also be a monomer mixture.
  • suitable monomers the person skilled in the art can stick to polymers which are already common in the prior art in connection with the powder to be used.
  • the process according to the invention can be carried out at a negative pressure in the range from 0.001 to 5 mear and in particular 0.01 to 0.5 mdar.
  • the low-pressure plasma is preferably ignited and maintained with microwaves at a frequency of approximately 2.45 GHz.
  • the powder is allowed to fall freely through the low-pressure plasma, ie on ballistic paths.
  • a dren mixing drum which is arranged in the low-pressure plasma or in the vacuum chamber.
  • the term powder is not to be understood narrowly, but is intended to encompass a general bulk material made of discrete particles, for example also fibers (such as glass fibers) of a short length (for example from 0.1 to 1 mm).
  • the powder or bulk material should consist of discrete parts which can fall through the plasma on ballistic tracks and which, after their conditioning, either as a mass (if appropriate in the presence of auxiliaries) of a shaping or as an addition (for example as a reinforcing or extending agent) to one formoaren mass can be subjected to a shaping process.
  • conditionable powders are inorganic powders, for example Graomt, ceramic, glass or metal, such as hard metal.
  • ceramic powders are powders for technical ceramics, for example for oxide ceramics such as aluminum oxide, magnesium oxide, zirconium oxide or beryllium oxide, or for non-oxide ceramics such as carbides, e.g. Boron carbide or silicon carbide, or such as nitrides, e.g. Boron nitride, silicon nitride or aluminum nitride.
  • oxide ceramics such as aluminum oxide, magnesium oxide, zirconium oxide or beryllium oxide
  • non-oxide ceramics such as carbides, e.g. Boron carbide or silicon carbide, or such as nitrides, e.g. Boron nitride, silicon nitride or aluminum nitride.
  • a device for carrying out the method according to the invention in which the vacuum chamber in which the low-pressure plasma is ignited and maintained comprises a mixing drum in which the powder used can fall freely through the low-pressure plasma.
  • a device according to P 37 38 352.3 with a 100-1 low pressure chamber was used. in which a mixing drum (about 20 Liter volume) was arranged with ejection. This mixing drum was charged with 10 kg of graphite and, after the low-pressure plasma had been ignited, was driven by an electric motor. Methyl methacrylate was chosen as the plasma atmosphere, the low-pressure plasma being maintained at a pressure of 0.4 mbar with microwaves at a frequency of approximately 2.45 GHz.
  • Example 1 According to Example 1, the exception was that 5 kg of silicon carbide was subjected to the plasma polymerization. 100 pieces of green foils were punched out of the conditioned powder obtained in order to produce ceramic heat exchangers. These green sheets were burned out in the usual way. Their mechanical strength corresponded to the requirements applicable to Kerarm heat exchangers.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Thermal Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

L'invention concerne un procédé de conditionnement d'une poudre dans un plasma à basse pression ainsi que le dispositif correspondant.
PCT/EP1991/000315 1990-02-20 1991-02-20 Procede et dispositif de conditionnement d'une poudre WO1991012881A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4005328.8 1990-02-20
DE4005328A DE4005328A1 (de) 1990-02-20 1990-02-20 Verfahren zur konditionierung eines pulvers und vorrichtung dafuer

Publications (1)

Publication Number Publication Date
WO1991012881A1 true WO1991012881A1 (fr) 1991-09-05

Family

ID=6400583

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/000315 WO1991012881A1 (fr) 1990-02-20 1991-02-20 Procede et dispositif de conditionnement d'une poudre

Country Status (2)

Country Link
DE (1) DE4005328A1 (fr)
WO (1) WO1991012881A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009044A1 (fr) * 1993-09-29 1995-04-06 E.I. Du Pont De Nemours And Company Granulation par fusion faisant appel au chauffage dielectrique
US8858210B2 (en) 2009-09-24 2014-10-14 Mcneil-Ppc, Inc. Manufacture of variable density dosage forms utilizing radiofrequency energy
US8865204B2 (en) 2009-09-24 2014-10-21 Mcneil-Ppc, Inc. Manufacture of lozenge product with radiofrequency
US8968769B2 (en) 2007-10-31 2015-03-03 Mcneil-Ppc, Inc. Orally disintegrative dosage form
US9233491B2 (en) 2012-05-01 2016-01-12 Johnson & Johnson Consumer Inc. Machine for production of solid dosage forms
US9445971B2 (en) 2012-05-01 2016-09-20 Johnson & Johnson Consumer Inc. Method of manufacturing solid dosage form
US9511028B2 (en) 2012-05-01 2016-12-06 Johnson & Johnson Consumer Inc. Orally disintegrating tablet
US9789066B2 (en) 2014-01-10 2017-10-17 Johnson & Johnson Consumer Inc. Process for making tablet using radiofrequency and lossy coated particles
US10493026B2 (en) 2017-03-20 2019-12-03 Johnson & Johnson Consumer Inc. Process for making tablet using radiofrequency and lossy coated particles
CN116745253A (zh) * 2021-01-26 2023-09-12 杰富意钢铁株式会社 等离子体处理方法、等离子体处理六方氮化硼粉末的制造方法以及等离子体处理装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2011306A1 (de) * 1969-03-10 1970-09-17 Fa. Progil, Paris Verfahren zum Umhüllen oder Einkapseln von pulverförmigen Materialien
JPS63242906A (ja) * 1987-03-30 1988-10-07 Hitachi Ltd 酸化物超微粒子の製造方法
DE3738352A1 (de) * 1987-11-11 1989-05-24 Technics Plasma Gmbh Filamentloses magnetron-ionenstrahlsystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2011306A1 (de) * 1969-03-10 1970-09-17 Fa. Progil, Paris Verfahren zum Umhüllen oder Einkapseln von pulverförmigen Materialien
JPS63242906A (ja) * 1987-03-30 1988-10-07 Hitachi Ltd 酸化物超微粒子の製造方法
DE3738352A1 (de) * 1987-11-11 1989-05-24 Technics Plasma Gmbh Filamentloses magnetron-ionenstrahlsystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 13, Nr. 49 (C-565)(3397), 3. Februar 1989; & JP-A-63242906 (HITACHI LTD) 7. Oktober 1988 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009044A1 (fr) * 1993-09-29 1995-04-06 E.I. Du Pont De Nemours And Company Granulation par fusion faisant appel au chauffage dielectrique
US8968769B2 (en) 2007-10-31 2015-03-03 Mcneil-Ppc, Inc. Orally disintegrative dosage form
US9610224B2 (en) 2009-09-24 2017-04-04 Johnson & Johnson Consumer Inc. Manufacture of tablet in a die utilizing powder blend containing water-containing material
US8871263B2 (en) 2009-09-24 2014-10-28 Mcneil-Ppc, Inc. Manufacture of tablet in a die utilizing radiofrequency energy and meltable binder
US8865204B2 (en) 2009-09-24 2014-10-21 Mcneil-Ppc, Inc. Manufacture of lozenge product with radiofrequency
US9107807B2 (en) 2009-09-24 2015-08-18 Mcneil-Ppc, Inc. Machine for the manufacture of dosage forms utilizing radiofrequency energy
US8858210B2 (en) 2009-09-24 2014-10-14 Mcneil-Ppc, Inc. Manufacture of variable density dosage forms utilizing radiofrequency energy
US9233491B2 (en) 2012-05-01 2016-01-12 Johnson & Johnson Consumer Inc. Machine for production of solid dosage forms
US9445971B2 (en) 2012-05-01 2016-09-20 Johnson & Johnson Consumer Inc. Method of manufacturing solid dosage form
US9511028B2 (en) 2012-05-01 2016-12-06 Johnson & Johnson Consumer Inc. Orally disintegrating tablet
US9789066B2 (en) 2014-01-10 2017-10-17 Johnson & Johnson Consumer Inc. Process for making tablet using radiofrequency and lossy coated particles
US10493026B2 (en) 2017-03-20 2019-12-03 Johnson & Johnson Consumer Inc. Process for making tablet using radiofrequency and lossy coated particles
CN116745253A (zh) * 2021-01-26 2023-09-12 杰富意钢铁株式会社 等离子体处理方法、等离子体处理六方氮化硼粉末的制造方法以及等离子体处理装置

Also Published As

Publication number Publication date
DE4005328C2 (fr) 1991-12-12
DE4005328A1 (de) 1991-08-22

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