WO2017098025A1 - Procédé et dispositif pour préparer des microsphères contenant une matière frittable - Google Patents

Procédé et dispositif pour préparer des microsphères contenant une matière frittable Download PDF

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Publication number
WO2017098025A1
WO2017098025A1 PCT/EP2016/080528 EP2016080528W WO2017098025A1 WO 2017098025 A1 WO2017098025 A1 WO 2017098025A1 EP 2016080528 W EP2016080528 W EP 2016080528W WO 2017098025 A1 WO2017098025 A1 WO 2017098025A1
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WIPO (PCT)
Prior art keywords
suspension
nozzle
sinterable
microspheres
powder
Prior art date
Application number
PCT/EP2016/080528
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German (de)
English (en)
Inventor
Markus ZWICK
Original Assignee
Forschungsinstitut Für Anorganische Werkstoffe - Glas Keramik Gmbh
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Publication of WO2017098025A1 publication Critical patent/WO2017098025A1/fr

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    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • 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
    • C04B35/5607—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 refractory metal carbides
    • C04B35/5626—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 refractory metal carbides based on tungsten carbides
    • 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
    • C04B35/515—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
    • C04B35/58—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 borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—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 borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • 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
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62695—Granulation or pelletising

Definitions

  • the present invention relates to a method and an apparatus for producing a sinterable substance-containing microspheres, in particular ceramic microspheres or metallic microspheres, in particular for the production of sinterable material containing grinding balls having a diameter of at most 100 ⁇ . More particularly, the present invention relates to a method and apparatus for producing sinterable-containing microspheres by means of an inkjet injector assembly.
  • Ceramic grinding balls are usually produced in a drying method by means of needle injectors or in a so-called cutting harp method. In both processes, a suspension containing a ceramic powder is dripped and the resulting droplets of the suspension are cured by ion exchange in a Lacktat bath.
  • pressing methods are available for the production of ceramic grinding balls of different sizes.
  • the object of the present invention is to provide a method and a device with which a microsphere containing sinterable material, in particular ceramic or metallic microspheres, having a homogeneous spherical size distribution, homogeneous sintered density and high sphericity can be produced in a simple and effective manner.
  • the present invention relates to a process for producing sinterable material-containing microspheres (hereinafter also referred to as "microspheres”), for example microspheres of a sinterable material, in particular ceramic microspheres or metallic microspheres, for example micro-milling spheres a suspension containing a sinterable powder (hereinafter also referred to as "suspension”), producing suspension droplets of the suspension and subjecting the suspension droplets to a hardening process to form the microspheres from the suspension droplets Suspended into a nozzle chamber of a nozzle and generated in the nozzle chamber for ejecting the suspension drop from a nozzle opening of the nozzle a short-term pressure.
  • microspheres sinterable material-containing microspheres
  • microspheres for example microspheres of a sinterable material, in particular ceramic microspheres or metallic microspheres, for example micro-milling spheres a suspension containing a sinterable powder (hereinafter also referred to as
  • a nozzle with a nozzle chamber in which a short-term excess pressure is generated for ejecting a suspension drop from the nozzle opening, for example an inkjet injector, is used, very small suspension droplets can be generated in a targeted manner whose droplet size depends on a size of the can be varied by suitable choice of structural and functional properties of the nozzle to be prepared microspheres.
  • the production of microspheres with a very small spherical size is made possible with simultaneously low scattering width of the spherical size distribution, high sphericity and, moreover, due to the surface tension of the suspension, almost ideal surface structures.
  • the microspheres produced by the method according to the invention may have a diameter which is less than 1 mm, in particular less than 100 ⁇ , in particular less than 50 ⁇ .
  • the microspheres may have a sphericity which is at least 0.8, in particular at least 0.9.
  • microspheres produced by the process according to the invention can be used, for example, as micro-milling spheres.
  • micro-milling balls in particular ceramic micro-milling balls and / or metallic micro-balls, are used in the comminution and / or dispersion of particulate substances, for example in the pharmaceutical industry, the chemical industry, the paint and / or paint industry and metal and / or ceramic processing ,
  • the suspension containing the sinterable powder may contain, in addition to the sinterable powder, a solvent, an organic and / or inorganic binder system and / or one or more rheological additives.
  • the solvent may be water or contain water.
  • the organic binder system may be, for example, a lactate system.
  • the rheological additives may contain, for example, a dispersing aid, a defoamer and / or a stabilizer.
  • the sinterable powder contained in the suspension may contain a sinterable material, for example, a sinterable substance or a sinterable mixture of two or more pure substances, which preferably is a powder having a particle size smaller than ⁇ , is processable.
  • the sinterable material may be a ceramic Material, a metallic material and / or a glass material or consist of one or more of these materials.
  • the ceramic material may comprise zirconia, alumina, silicon carbide, silicon nitride, tungsten carbide, and / or other ceramic material or may consist of one or more of these materials.
  • Zirconium oxide and aluminum oxide are characterized by their high hardness and high resistance and are ideally suited for use as a base material for grinding balls.
  • the metallic material may comprise a cemented carbide, for example tungsten carbide-cobalt, or a pure metal, or may consist of one or more of these substances.
  • the sinterable powder may comprise powder particles having a particle size which is smaller than ⁇ , in particular less than 500 nm. Due to the small size of the powder particles of the sinterable powder, the sinterable powder can be uniformly distributed in the suspension, resulting in a homogeneous density of the microspheres to be produced. In addition, due to the small size of the powder particles blockages of the nozzle with the sinterable powder can be avoided to a large extent.
  • the particle size of the sinterable powder may, for example, have a monomodal, bimodal or multimodal distribution.
  • the suspension containing the sinterable powder may comprise a proportion of sinterable powder in the range of 30% to 70%, in particular of about 50%.
  • the suspension drops produced can each have a drop volume in the range from 5 pl to 5000 pl, in particular in the range from 10 pl to 1000 pl.
  • the drop volume of the suspension drops may be greater than a volume of the final microspheres, as chemical reactions occurring during curing and subsequent processing steps may cause a reduction in volume.
  • the short-term excess pressure in the nozzle chamber for generating the suspension drops can be generated, for example, by applying a voltage pulse to means arranged in the region of the nozzle chamber for generating an excess pressure.
  • the short-term excess pressure can be generated by applying a voltage pulse to a piezoelectric element, to a heating element and / or to an ultrasonic transmitter.
  • the voltage pulse can be adapted to the nozzle chamber, in particular its shape and / or size, and to the means for generating the overpressure, in particular on the nature, size and / or positioning on or in the nozzle chamber, that suspension drops with a predetermined Drop volume can be generated.
  • the short-term overpressure may prevail during a time interval between the activation of the means for generating the overpressure until the ejection of the suspension drop. This time interval can be at most 0.5 ms, in particular at most 0.1 ms.
  • the suspension drops are fed to a hardening process.
  • a hardening process This can be done for example by an ion exchange and / or another hardening process.
  • the ion exchange can be carried out, for example, by introducing the suspension drops into a curing bath, for example a lactate bath.
  • the microspheres can be removed from the curing bath.
  • the curing bath can be screened or filtered with the microspheres.
  • a sieve can be provided in the curing bath, which can be removed from the curing bath together with the microspheres.
  • microspheres can be subjected to further processing steps.
  • the microspheres formed can be dried.
  • the microspheres for a predetermined period of time, for example a few hours, in a drying device, such as a drying oven, introduced and dried therein at a temperature in the range of 30 ° C to 60 ° C.
  • the microspheres formed can be sintered.
  • the microspheres may be introduced into a sintering device, for example a sintering furnace, for a given period of time, for example a few hours, at a temperature a few degrees (° C) below a melting temperature of the sinterable powder, and optionally at an external pressure be sintered at elevated pressure.
  • a sintering device for example a sintering furnace, for a given period of time, for example a few hours, at a temperature a few degrees (° C) below a melting temperature of the sinterable powder, and optionally at an external pressure be sintered at elevated pressure.
  • drying and sintering may be in the same oven.
  • the microspheres can be classified.
  • the microspheres can be classified according to their size, their density and / or their sphericity. Drying and / or sintering and classification can be done in order.
  • the present invention furthermore relates to a device for producing microsphere containing a sinterable substance, for example microspheres of a sinterable material, in particular ceramic microspheres or metallic microspheres.
  • the device for producing microspheres comprises a feed line for providing a suspension containing a sinterable powder, a nozzle arrangement for generating suspension drops of the suspension and a curing device for subjecting the suspension drops to a hardening process and for forming the microspheres from the ejected suspension drops.
  • the nozzle assembly includes a nozzle having a nozzle chamber for receiving a predetermined one Amount of the suspension via the supply line, a communicating with the nozzle chamber nozzle opening and means for generating a short-term overpressure in the nozzle chamber.
  • the device according to the invention makes it possible to produce microspheres with a very small sphere size while at the same time having a low scattering range of the spherical size distribution, high sphericity and, moreover, due to the surface tension of the suspension, almost ideal surface structures.
  • the device is designed in particular for producing microspheres by means of the above-described method for producing microspheres.
  • the suspension containing the sinterable powder may contain, in addition to the sinterable powder, a solvent, an organic and / or inorganic binder system and / or rheological additives.
  • the sinterable powder and the suspension containing the sinterable powder may be as described above with respect to the process for producing microspheres.
  • the supply line for providing the suspension may be a pipe or a hose.
  • the supply line can be connected to a receiving opening with a storage and / or mixing container for storing and / or preparing the suspension containing the sinterable powder.
  • the supply line With an outlet opening, the supply line can be connected to the nozzle arrangement, in particular to the nozzle chamber of the nozzle, in order to introduce the suspension from the supply and / or mixing container via the supply line into the nozzle arrangement, in particular into the nozzle chamber.
  • the nozzle may preferably be designed such that a volume of the suspension drops to be produced deviates by at most 5%, in particular at most 2%, from a predetermined volume. This can be achieved if the nozzle is manufactured with a predetermined accuracy and the means for generating a short-term overpressure in the nozzle chamber are precisely controllable.
  • the nozzle chamber may be a cavity having, for example, the shape of an ellipsoid or a cuboid or another shape.
  • the cavity can receive an amount of suspension which corresponds to a multiple of a suspension drop to be generated.
  • the cavity can absorb a maximum of 10000 pl of the suspension.
  • the nozzle opening which communicates with the nozzle chamber, may have a diameter in the range from 10 ⁇ m to 200 ⁇ m.
  • the nozzle opening may be formed as an opening in a housing forming the nozzle chamber or in a nozzle chamber wall forming the nozzle chamber.
  • the nozzle may have one or more nozzle openings.
  • the nozzle orifices of the nozzle can be arranged so that partial droplets, which simultaneously emerge from the nozzle orifices, combine to form a drop of suspension. A microsphere can then be produced from the suspension drop combined from the partial drops.
  • the nozzle openings may have the same or different diameters, which are preferably between 10 ⁇ to 100 ⁇ .
  • the means for generating the short-term overpressure in the nozzle chamber may be arranged, for example, on or in the housing forming the nozzle chamber or in the nozzle chamber.
  • the means for generating the short-term overpressure may be designed to generate a short-term overpressure which is suitable for generating suspension drops, each with a drop volume in the range from 5 pl to 5000 pl, in particular in the range from 10 pl to 1000 pl, by means of the nozzle opening is.
  • the short-term overpressure may be a single pressure pulse through which a complete suspension drop is expelled from the nozzle.
  • the short-term overpressure may comprise one or more successive pressure pulses, a partial drop being ejected from the nozzle by each pressure pulse. The successive pressure pulses are preferably timed such that the ejected partial drops combine to form a suspension drop from which a microsphere can then be produced.
  • the means for generating the short-term overpressure may comprise a piezoelectric element which is arranged in the region of the nozzle chamber on the housing forming the nozzle chamber such that a reduction in the volume of the nozzle chamber is established upon activation of the piezoelectric element.
  • the means for generating the short-term overpressure may also include a heating element, which is arranged for example in the nozzle chamber.
  • other means for generating the short-term overpressure or combinations of different means for generating the short-term overpressure may also be used.
  • the nozzle of the nozzle arrangement can be, for example, an inkjet injector.
  • the nozzle may be a piezoinjector with a piezo element as means for generating the short-term overpressure, a thermal injector with a heating element as means for generating the short-term overpressure, an ultrasonic injector with an ultrasound generator as means for generating the short-term overpressure or another inkjet injector ,
  • the nozzle assembly may comprise a plurality of identical nozzles arranged in a row or a matrix.
  • the nozzles can be arranged at a predetermined distance from each other. The distance is preferably so great that the suspension drops produced simultaneously do not collide during the curing process in the curing device, especially during their fall into a curing bath and optionally during their sinking in the curing bath.
  • the distance between two or more adjacent nozzles may also be selected such that from the two or more adjacent nozzles emerging drops to a suspension drop, from which then the microsphere can be generated, unite.
  • the nozzle arrangement can be arranged at a predetermined distance from the curing bath, in particular above the curing bath. For example, a distance may be in the range of 20 cm to 50 cm. This makes it possible that the suspension drops have a high sphericity when immersed in the curing bath.
  • the curing bath which may comprise a lactate bath as described above with respect to the process of the invention, may have a depth of between 50 cm and 100 cm. This allows the suspension drops to harden sufficiently during the sinking operation to avoid changes in shape during the impact on a bath floor.
  • the nozzle arrangement may be designed to be movable in one plane in one or more directions. For example, if the curing device is designed as a curing, the
  • Nozzle arrangement can be arranged above the curing bath, wherein the nozzles are aligned with their nozzle opening in the direction of the Aushärtebads and displaceable in a horizontal plane above the Aushärtebad.
  • the nozzle assembly may comprise a plurality of nozzles arranged in a row and may be displaced back and forth in one direction above the curing apparatus. This allows a rapid production of microspheres, while avoiding that suspension drops that have not yet cured sufficiently collide in the curing device.
  • the device for producing microspheres may comprise a supply and / or mixing container for storing and / or preparing the suspension containing the sinterable powder.
  • the storage and / or mixing container may be a storage container in which the suspension is stored, or a mixing container in which the ingredients of the suspension are mixed.
  • the storage container may include an agitator to prevent the contents of the suspension from separating.
  • the mixing vessel may comprise a funnel and / or a scale to introduce the contents of the suspension in the required amount into the mixing vessel, and / or an agitator to mix the ingredients of the suspension.
  • the device for producing microspheres may further comprise a drying device for drying the microspheres formed, for example a drying oven, a sintering device for sintering the microspheres formed, for example a sintering oven, and / or a classification unit for classifying the microspheres formed.
  • the apparatus for producing microspheres may comprise means for removing the microspheres from the
  • Curing device for example, the curing bath from the drying unit, the sintering unit and / or the classification unit include.
  • FIG. 1 shows a schematic representation of a device according to the invention for producing ceramic microspheres
  • FIG. 2 is a flow chart of a method for producing ceramic microspheres
  • Fig. 3A, B a first embodiment of a nozzle of the device according to the invention for
  • the device 1 shows a schematic representation of a device 1 according to the invention for producing ceramic microspheres.
  • the device 1 comprises a storage container 10, a supply line 11, a nozzle arrangement 12 with three nozzles 3 and a collecting container 13, which with a
  • Curing bath 130 is filled.
  • the storage container 10 is designed to store an alumina-containing suspension 2.
  • the storage container 10 comprises an agitator 100, with which the suspension 2 is mixed continuously.
  • the storage container 10 comprises in its bottom 101 an opening 102 for discharging the suspension 2 into the supply line 11.
  • the supply line 11 is connected to a receiving opening 110 in the region of the opening 102 with the storage container 10.
  • the supply line 11 comprises three outlet openings 111, which are connected to a respective one of the nozzles 3 of the nozzle arrangement 12.
  • the outlet openings 111 are located below the receiving opening 110.
  • the nozzles 3 of the nozzle assembly 12 are formed as inkjet injectors and will be described in detail below with reference to Fig. 3A to Fig. 4B.
  • the nozzles 3 of the nozzle assembly 12 are arranged on a carrier 120 in a row, wherein a nozzle opening 30 of each nozzle 3 is oriented downward or in a direction away from the storage container 10 direction.
  • the collecting container 13 is arranged directly below the nozzle arrangement 12, so that suspension drops 20 produced by the nozzles 3 fall into the curing bath 130 and cure there to form ceramic microspheres 4.
  • FIG. 2 shows a flow chart of a method 5 for producing ceramic microspheres with the aid of the device 1 described.
  • an alumina-containing suspension 2 is provided.
  • the storage container 10 of the device 1 is filled with the suspension 2.
  • the suspension 2 can reach the nozzles 3 of the nozzle arrangement 12.
  • suspension drops 20 of the suspension 2 are produced.
  • a predetermined amount of the suspension 2 is guided into a nozzle chamber 32 of each nozzle 3 and generates a short-term overpressure in the nozzle chamber 32 for ejecting the suspension droplet 20 from the nozzle opening 30 of the nozzle 3.
  • the overpressure is generated by activating a means for generating an overpressure.
  • the means for generating the overpressure may be a piezo element 33 or a heating element 34.
  • the suspension drops 20 are introduced into the curing bath 130 in the collecting container 13.
  • the generated suspension drops 20 are collected in the curing bath 130.
  • FIGS. 3A and 3B show a first exemplary embodiment of a nozzle structure of the nozzles 3 of the nozzle arrangement 12 in the form of a piezo injector 3a.
  • the piezo injector 3a comprises a nozzle opening 30, a line section 31, a nozzle chamber 32 and a piezoelectric element 33.
  • the line section 31 is connected via an inlet opening with the nozzle chamber 32 to admit the suspension 2 into the nozzle chamber 32.
  • the piezoelectric element 33 is arranged on the side of the nozzle chamber 32 on a nozzle chamber wall.
  • the nozzle opening 30 communicates with the nozzle chamber 32 and is disposed opposite the inlet opening.
  • Fig. 3A the piezo injector 3a is shown in a state in which the piezoelectric element 33 is not activated.
  • the nozzle chamber 32 is filled to an outlet end of the nozzle opening 30 with suspension.
  • the piezoelectric element 33 changes its shape such that the volume of the nozzle chamber 32 is reduced and an overpressure in the nozzle chamber 32 arises.
  • the suspension 2 in the nozzle opening 30 is pressed out of the nozzle opening 30, so that a suspension drop 20 is detached from the nozzle opening 30.
  • FIGS. 4A and 4B show a second exemplary embodiment of a nozzle structure of the nozzles 3 of the nozzle arrangement 12 in the form of a thermal inkjet injector 3b.
  • the thermal inkjet injector 3b includes a nozzle port 30, a conduit section 31, a nozzle chamber 32, and a heating element 34.
  • the conduit section 31 is connected to the nozzle chamber 32 via an inlet port to admit the suspension into the nozzle chamber 32.
  • the heating element 34 is arranged centrally in the nozzle chamber 32.
  • the nozzle port 30 communicates with the nozzle chamber 32 and is opposed to the inlet port.
  • Fig. 4A the thermal inkjet injector 3b is shown in a state in which the heating element 34 is not activated.
  • the nozzle chamber is filled with suspension 2 up to an outlet end of the nozzle opening 30.
  • a vapor bubble 21 of vaporized suspension forms around the heating element 34, as shown in FIG. 4B, in such a way that an excess pressure is created in the nozzle chamber 32.
  • the suspension in the nozzle opening 30 is pressed out of the nozzle opening 30, so that a suspension drop 20 separates from the nozzle opening 30.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Composite Materials (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

La présente invention concerne un procédé pour préparer des microsphères (40) contenant une matière frittable, notamment des microsphères céramiques ou des microsphères métalliques. Le procédé comprend les étapes consistant à fournir (50) une suspension (2) contenant une poudre frittable, à produire (51) des gouttes de suspension (20) de la suspension (2), la production d'une goutte de suspension (20) s'effectuant par passage d'une quantité prédéterminée de la suspension (2) dans une chambre de buse (32) d'une buse (3) et production d'une surpression de courte durée dans la chambre de buse (32) pour expulser la goutte de suspension (20) hors de l'ouverture de buse (30) de la buse (3), et à soumettre (52) les gouttes de suspension (20) à un processus de durcissement pour former des microsphères (4) contenant une substance frittable à partir des gouttes de suspension (20).
PCT/EP2016/080528 2015-12-11 2016-12-09 Procédé et dispositif pour préparer des microsphères contenant une matière frittable WO2017098025A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015224974.3 2015-12-11
DE102015224974.3A DE102015224974A1 (de) 2015-12-11 2015-12-11 Verfahren und Vorrichtung zum Herstellen von einen sinterfähigen Stoff enthaltenden Mikrokugeln

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WO2017098025A1 true WO2017098025A1 (fr) 2017-06-15

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