EP0938940B1 - Procédé pour le traitement de surface de pièces en titane et en alliage de titane - Google Patents

Procédé pour le traitement de surface de pièces en titane et en alliage de titane Download PDF

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Publication number
EP0938940B1
EP0938940B1 EP19980102510 EP98102510A EP0938940B1 EP 0938940 B1 EP0938940 B1 EP 0938940B1 EP 19980102510 EP19980102510 EP 19980102510 EP 98102510 A EP98102510 A EP 98102510A EP 0938940 B1 EP0938940 B1 EP 0938940B1
Authority
EP
European Patent Office
Prior art keywords
sealed vessel
neutral atmosphere
vessel under
cast device
titanium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19980102510
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German (de)
English (en)
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EP0938940A1 (fr
Inventor
Italo Morena
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.)
Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to ES98102510T priority Critical patent/ES2205290T3/es
Priority to EP19980102510 priority patent/EP0938940B1/fr
Priority to DE69817320T priority patent/DE69817320T2/de
Publication of EP0938940A1 publication Critical patent/EP0938940A1/fr
Application granted granted Critical
Publication of EP0938940B1 publication Critical patent/EP0938940B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/26—Anodisation of refractory metals or alloys based thereon

Definitions

  • the present invention relates to a process for treating under a controlled atmosphere the surface of pieces or articles made of titanium and alloys thereof or similar metals.
  • the articles are preferably formed through lost-wax casting, particularly for use in prosthetic dentistry, orthodontics and the like.
  • titanium has peculiar properties such as the affinity with O 2 and H, and becomes easily oxidated at high temperature regardless of the O 2 partial pressure.
  • a casting process for producing castings by melting titanium with a vacuum arc in a copper, water-cooled crucible is disclosed in M.J. Donachie: "Titanium - A Technical Guide” 1988, ASM, Metals Park, Ohio, US.
  • GB 2 244 019 and GB 2 244 019 disclose a method for casting of dental metals with a casting apparatus comprising an hermetically sealed casting chamber under inert gas atmosphere.
  • FR 2695581 discloses a treatment of an oxidation-sensitive metal carried out in isolated surroundings. It consists of introducing the metal into these surroundings, producing a partial vacuum, melting the metal, introducing the melt into a mould, and letting it solidify. The surroundings, after they have been set under a partial vacuum, are flushed by means of an inert gas.
  • all the operations required to obtain a finished article are accomplished under a neutral and controlled atmosphere in a single apparatus so as to obtain a finished piece that is protected by a strongly adhering film and has a fine appearence before being transferred to a normal atmosphere and then in the oral cavity environment.
  • the piece is then subjected to anodic oxidation or nitriding in an ammonia atmosphere, which allows the properly forming of a protective coating of oxide or nitride having an adherence strength to the piece in the order of 1,400 kg/mm 2 .
  • Such apparatus substantially comprises a sealed vessel 1 provided with a transparent cover so that all the operating steps can be visually checked and controlled, and provided with introflexed rubber gloves for manipulating the articles.
  • the apparatus is further provided with a bottle of an inert gas and an associated pressure reducing valve; it is further provided with a vacuum pump and a Getter device 3 adapted to cause a quick and complete oxidation of the metal contained within the apparatus, thus removing all the residual O 2 molecules within the sealed vessel 1.
  • the sealed vessel 1 further houses a high temperature cylinder 5 where the article is cast, a tank 7 containing a liquid bath (e.g. oil) in which the article can be quenched, and an arm 6 for removing the article from the cylinder 5 and dipping it into the oil bath of the tank 7 where it is quenched in absence of contaminants.
  • a liquid bath e.g. oil
  • a finishing station 9 (cooling area), a sandblasting station 11 and a pickling station 13.
  • an additional (if required) station 15 for mechanically polishing the article there are contained an additional (if required) station 15 for mechanically polishing the article, a station 17 for (micro) welding operations and a station (not shown) for spot-welding operations. All the above mentioned operations of polishing and welding are carried out in the neutral atmosphere.
  • the vessel 1 further contains an anodic oxidation device 19 an a device 21 for nitriding the article in an ammonia atmosphere.
  • an oxide coating or a nitride coating is formed on the surface of the article 23 or 25, such a coating having an adhesion force (cohesion) comprised between 1,000 and 2,000 kg/mm 2 , and preferably in the order of 1,400 kg/mm 2 .
  • the article 23 (or 25) can be exposed to the atmosphere or to contaminants without the risk of being subjected to further undesided chemical or chemical-physical reactions, either on the surface or in the body of the article.
  • Such qualities are for example a pink coloring when the article has to blend with the gengival mucosa or a milk coloring when the orthodontic devices are located on the enamel of natural dental crowns.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Claims (8)

  1. Un procédé pour obtenir des appareils prothétiques en titane ou en des alliages de celui-ci pour être utilisés dans la cavité buccale, ledit procédé comprenant les étapes de :
    fournir un récipient fermé ;
    obtenir une atmosphère neutre dans ledit récipient fermé, au moyen d'un gaz inerte, d'une pompe à vide et d'un système de Getter, ledit système de Getter comprenant un métal approprié pour provoquer une oxydation rapide et totale, éliminant ainsi pratiquement toutes les molécules d'O2 résiduelles dans ledit récipient fermé ;
    former un appareil prothétique dans un cylindre de moulage à haute température dans ledit récipient fermé sous l'atmosphère neutre ainsi obtenue ;
    plonger ledit appareil de moulage dans un bain de refroidissement dans ledit récipient fermé sous la même atmosphère neutre, provoquant ainsi le refroidissement de l'appareil de moulage dans ledit récipient fermé sous la même atmosphère neutre ;
    soumettre ensuite ledit appareil de moulage à une oxydation anodique dans ledit récipient fermé sous la même atmosphère neutre, formant ainsi un revêtement protecteur sur la surface dudit appareil de moulage.
  2. Un procédé selon la revendication 1, dans lequel ledit gaz inerte est un gaz rare, de préférence l'argon.
  3. Un procédé selon la revendication 1, dans lequel ledit appareil est formé dans ledit cylindre de moulage à haute température par moulage à la cire perdue.
  4. Un procédé selon la revendication 1, dans lequel la température dudit cylindre de moulage est de 800 °C environ.
  5. Un procédé selon la revendication 1, dans lequel ledit bain liquide est un bain d'huile.
  6. Un procédé selon la revendication 1, dans lequel un tel revêtement a une force d'adhésion (cohésion) comprise entre 1000 kg/mm2 à 2000 kg/mm2, et de préférence de l'ordre de 1400 kg/mm2.
  7. Un procédé selon la revendication 1, dans lequel ledit procédé comprend en outre les étapes de finition, sablage et décapage de l'appareil de moulage, toutes ces opérations supplémentaires étant réalisées dans ledit récipient fermé sous ladite atmosphère neutre.
  8. Un procédé selon la revendication 1, dans lequel ledit procédé comprend en outre les étapes de polissage et/ou soudage de l'appareil de moulage, toutes ces opérations supplémentaires étant réalisées dans ledit récipient fermé, sous ladite atmosphère neutre.
EP19980102510 1998-02-13 1998-02-13 Procédé pour le traitement de surface de pièces en titane et en alliage de titane Expired - Lifetime EP0938940B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES98102510T ES2205290T3 (es) 1998-02-13 1998-02-13 Proceso para tratar la superficie de articulos hechos de titanio y sus aleaciones.
EP19980102510 EP0938940B1 (fr) 1998-02-13 1998-02-13 Procédé pour le traitement de surface de pièces en titane et en alliage de titane
DE69817320T DE69817320T2 (de) 1998-02-13 1998-02-13 Verfahren zur Oberflächenbehandlung von Werkstücken aus Titan und Titanlegierungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980102510 EP0938940B1 (fr) 1998-02-13 1998-02-13 Procédé pour le traitement de surface de pièces en titane et en alliage de titane

Publications (2)

Publication Number Publication Date
EP0938940A1 EP0938940A1 (fr) 1999-09-01
EP0938940B1 true EP0938940B1 (fr) 2003-08-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980102510 Expired - Lifetime EP0938940B1 (fr) 1998-02-13 1998-02-13 Procédé pour le traitement de surface de pièces en titane et en alliage de titane

Country Status (3)

Country Link
EP (1) EP0938940B1 (fr)
DE (1) DE69817320T2 (fr)
ES (1) ES2205290T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455427A (zh) * 2020-05-26 2020-07-28 东莞金稞电子科技有限公司 一种铝合金表面砂面和高光面渐变处理工艺

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB732298A (en) * 1952-05-03 1955-06-22 Nat Lead Co Apparatus for casting refractory metals
JP2912940B2 (ja) * 1990-05-18 1999-06-28 株式会社ジーシー 歯科用金属の鋳造法
JP2912941B2 (ja) * 1990-05-18 1999-06-28 株式会社ジーシー 歯科用金属の鋳造方法
IT1257103B (it) * 1992-09-16 1996-01-05 Procedimento di lavorazione di materiali metallici in atmosfera controllata.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455427A (zh) * 2020-05-26 2020-07-28 东莞金稞电子科技有限公司 一种铝合金表面砂面和高光面渐变处理工艺

Also Published As

Publication number Publication date
EP0938940A1 (fr) 1999-09-01
DE69817320T2 (de) 2004-06-17
DE69817320D1 (de) 2003-09-25
ES2205290T3 (es) 2004-05-01

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