EP1740741A1 - Procede de realisation d'un corps cru - Google Patents

Procede de realisation d'un corps cru

Info

Publication number
EP1740741A1
EP1740741A1 EP05715051A EP05715051A EP1740741A1 EP 1740741 A1 EP1740741 A1 EP 1740741A1 EP 05715051 A EP05715051 A EP 05715051A EP 05715051 A EP05715051 A EP 05715051A EP 1740741 A1 EP1740741 A1 EP 1740741A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
mold
electrode
recess
liquid
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.)
Withdrawn
Application number
EP05715051A
Other languages
German (de)
English (en)
Inventor
Uwe Böhm
Wilhelm Heim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
C Hafner GmbH and Co KG
Original Assignee
C Hafner GmbH and Co KG
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 C Hafner GmbH and Co KG filed Critical C Hafner GmbH and Co KG
Publication of EP1740741A1 publication Critical patent/EP1740741A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/12—Electroforming by electrophoresis
    • C25D1/14—Electroforming by electrophoresis of inorganic material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/02—Tubes; Rings; Hollow bodies
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C25D17/12—Shape or form
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/02—Electrophoretic coating characterised by the process with inorganic material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/14—Tubes; Rings; Hollow bodies

Definitions

  • the invention relates to a method according to the preamble of claim 1, for producing a green body, by means of which solid particles are deposited on a mold arranged in a liquid, a first electrode being in contact with the liquid, and the mold having a recess in which a second electrode is arranged, and one of the electrodes is connected as an anode and the other of the electrodes is connected as a cathode. Furthermore, the invention relates to an electrode for producing a green body according to the preamble of claim 8 and a device for producing a green body.
  • a method mentioned above is known for example from EP 0 200 242 A2.
  • a porous membrane which corresponds to the shape of the green body to be produced, is arranged centrally within an anode in a vessel.
  • An electrically conductive liquid is contained in the vessel.
  • the membrane has an interior in which a cathode is arranged centrally.
  • a suspension is present in the interior of the membrane, the solid particles of which are deposited on the membrane by applying a direct voltage between the electrodes.
  • the problem with the known method is that the cathode has to be arranged centrally within the membrane.
  • the central arrangement is necessary so that the solid particles are deposited evenly on the membrane. If the arrangement is not centered, the layer deposited on the membrane has a different layer thickness.
  • DE 100 21 437 A1 also discloses a method for producing all-ceramic frameworks in dental technology, in which the stump of a working model is covered with a film or a lipstick-like release agent.
  • the coating is made electrically conductive, for example by using a metal-coated film or by applying a silver varnish.
  • the die is coated with an even ceramic layer that can be fired to a ceramic blank immediately after drying.
  • the purpose of the electrically conductive coating is to ensure that the ceramic layer has a very uniform layer thickness.
  • a disadvantage of this method is that the electrically conductive coating can adhere to the ceramic layer when it is removed. This in turn has the disadvantage in particular that during a subsequent sintering firing, for example, the silver lacquer diffuses into the ceramic layer, as a result of which the color can be falsified. Furthermore, the mechanical properties of the ceramic layer can change due to the diffused silver lacquer.
  • the invention is a method for producing a green body, in which solid particles are deposited on a mold arranged in a liquid, a first electrode being in contact with the liquid stands, and the shape has a recess in which a second electrode is arranged, and one of the electrodes is connected as an anode and the other of the electrodes is connected as a cathode, characterized in that an electrically conductive element is arranged on the surface of the recess.
  • the first electrode can advantageously be the surface of a container in which the liquid, which is regularly slurry, is contained.
  • the recess only has to be arranged centrally in the mold and the electrically conductive element used as an electrode. Since the recess can already be formed in the mold during the production of the mold, high centricity can be achieved in a simple manner, so that the electrode arranged on the surface of the recess is arranged exactly centrally in the mold. This has a very advantageous effect on the uniformity of the layer deposited on the mold.
  • the electrically conductive element can be formed, for example, by coating the surface of the recess with a suitable material, such as silver paint.
  • a film made of aluminum for example, could also be applied to the surface of the recess.
  • the element is a cylindrical or conical body and has a cavity.
  • a sleeve has proven to be particularly advantageous which can be introduced into a correspondingly designed recess.
  • the corresponding recess in the shape can be produced in a very simple and very precise manner.
  • such an element can be introduced into the recess without problems in such a way that it is arranged firmly in the recess. Due to the fixed arrangement in the recess, the element is very precise in shape arranged, which has a very advantageous effect on the uniformity of the layer deposited on the mold.
  • An embodiment of the invention in which the element is detachably connected to the mold is also very advantageous.
  • the element can be removed from the mold in a simple manner, which on the one hand has the advantage that the cavity of the mold is free again before the layer deposited on the mold is removed from the mold, which has an advantageous effect on removal from the mold, and on the other hand the advantage has that the element is reusable.
  • the element can advantageously be inserted or screwed into the recess.
  • an embodiment of the invention in which the element is designed as a sleeve which has openings is very advantageous. It is possible through the openings that a compensating liquid introduced into the interior of the element can penetrate into the mold via the surface of the recess.
  • a compensating liquid introduced into the interior of the element can penetrate into the mold via the surface of the recess.
  • the use of an electrically conductive compensating liquid ensures that there is very good electrical contact between the element and the surface of the recess.
  • the openings can be designed as slots, slots or bores.
  • an embodiment of the invention in which the sleeve is perforated has proven to be very advantageous. This ensures a very uniform penetration of the surface of the recess with the electrically conductive compensation liquid.
  • an electrode can be arranged centrally in the mold with the highest precision, whereby the layer deposited on the mold is characterized by a very uniform layer thickness. Furthermore, the method according to the invention avoids that, for example, silver conductive lacquer adheres to the layer deposited on the mold.
  • FIG. 1 shows a schematic representation of an arrangement for carrying out the method according to the invention
  • Figure 2 is an electrically conductive element formed as a sleeve
  • Figure 3 is a schematic representation of six successive process steps for performing the method according to the invention.
  • the inner surface 3a of a container 3 is electrically conductive and is designed as a cathode.
  • an aqueous suspension 1 which contains solid particles made of ceramic oxides such as aluminum oxide and / or zirconium dioxide.
  • a mold 2 consisting of plaster, the geometry of which is dimensioned such that a ceramic layer deposited on it has the shape of a dental prosthesis to be produced.
  • the immersion depth is such that Form 2 is in the suspension up to a so-called preparation limit.
  • a cylindrical bore 5 is formed in the mold 2 and is located centrally in the mold 2.
  • an electrical conductive material such as stainless steel (V 2 A) existing sleeve 4 which forms an anode.
  • V 2 A stainless steel
  • the sleeve 4 and the bore 5 are designed so that the sleeve 4 is firmly in the bore 5, but can be removed again with moderate effort.
  • the sleeve 4 has a region 4a with an enlarged diameter and a region 4b with a reduced diameter.
  • the transition between the two areas 4a, 4b is designed as a step 4c.
  • the penetration depth of the sleeve 4 into the bore 5 is limited by the step 4c.
  • the reduced diameter area 4b of the sleeve 4 has a plurality of bores 6. Liquid introduced into the interior 7 of the sleeve 4 can penetrate into the mold 2 through the bores 6.
  • a plaster stump corresponding to the dental prosthesis to be produced is first produced (a).
  • a central hole designed as a blind bore is then drilled in the plaster stump (b).
  • a sleeve made of an electrically conductive material is then inserted into the hole, which is perforated on its circumference (c).
  • a so-called compensation liquid, which is electrically conductive (d) is then introduced into the interior of the sleeve, for example by means of a pipette. The liquid is then left to act for about one to ten minutes, in particular three to five minutes, with liquid possibly having to be topped up during the contact time (e).
  • the plaster stump is then suspended into a suspension by means of a device which has a holder for the plaster stump and also makes an electrical connection to the sleeve. which contains ceramic powder, immersed and a voltage is applied between the sleeve and the corresponding container of the suspension, whereby a ceramic layer is deposited on the plaster stump (f).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Inorganic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

L'invention concerne un procédé pour réaliser un corps cru au moyen duquel des particules de matière solide sont déposées sur un moule (2) placé dans un liquide (1). Selon l'invention, une première électrode (3a) est mise en contact avec le liquide (1) et le moule (2) comporte un évidement (5) dans lequel est disposée une deuxième électrode (4), une des électrodes (4) servant d'anode et l'autre (3a) de cathode. L'invention est caractérisée en ce qu'un élément (4) électriquement conducteur est placé sur la surface de l'évidement (5).
EP05715051A 2004-04-20 2005-03-04 Procede de realisation d'un corps cru Withdrawn EP1740741A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410019110 DE102004019110A1 (de) 2004-04-20 2004-04-20 Verfahren zur Herstellung eines Grünkörpers
PCT/DE2005/000365 WO2005103339A1 (fr) 2004-04-20 2005-03-04 Procede de realisation d'un corps cru

Publications (1)

Publication Number Publication Date
EP1740741A1 true EP1740741A1 (fr) 2007-01-10

Family

ID=34963359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05715051A Withdrawn EP1740741A1 (fr) 2004-04-20 2005-03-04 Procede de realisation d'un corps cru

Country Status (3)

Country Link
EP (1) EP1740741A1 (fr)
DE (1) DE102004019110A1 (fr)
WO (1) WO2005103339A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009504278A (ja) 2005-08-15 2009-02-05 レスメド・リミテッド Ｃｐａｐ装置用加湿器槽
DE102006010808B4 (de) * 2006-03-07 2009-08-13 BEGO Bremer Goldschlägerei Wilh. Herbst GmbH & Co. KG Vorrichtung, System, Verfahren, Computerprogramm und Datenträger zur elektrophoretischen Abscheidung mit einer beweglichen Elektrode
ATE451886T1 (de) * 2006-10-05 2010-01-15 Rauter Vita Zahnfabrik Verfahren zur herstellung eines keramischen formteils
DE102015218620A1 (de) 2015-09-28 2017-03-30 Robert Bosch Gmbh Gehäuse für eine elektrische Maschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3511451A1 (de) * 1985-03-29 1986-10-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren und vorrichtung zur herstellung von glaskoerpern
US6059949A (en) * 1997-04-23 2000-05-09 Cerel (Ceramic Technologies) Ltd. Method of electrophoretic deposition of ceramic bodies for use in manufacturing dental appliances
DE10021437C2 (de) * 2000-05-03 2002-05-08 Stefan Wolz Verfahren zur Herstellung vollkeramischer Gerüste, insbesondere aus Alumina, in der Zahntechnik
DE10320936B4 (de) * 2003-05-09 2007-01-18 C. Hafner Gmbh + Co. Verfahren zur Herstellung keramischer Formkörper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005103339A1 *

Also Published As

Publication number Publication date
DE102004019110A1 (de) 2005-11-24
WO2005103339A1 (fr) 2005-11-03

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