WO2019110826A2 - Procédé pour retirer des structures de support métalliques d'un élément métallique fabriqué de manière additive - Google Patents

Procédé pour retirer des structures de support métalliques d'un élément métallique fabriqué de manière additive Download PDF

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Publication number
WO2019110826A2
WO2019110826A2 PCT/EP2018/084041 EP2018084041W WO2019110826A2 WO 2019110826 A2 WO2019110826 A2 WO 2019110826A2 EP 2018084041 W EP2018084041 W EP 2018084041W WO 2019110826 A2 WO2019110826 A2 WO 2019110826A2
Authority
WO
WIPO (PCT)
Prior art keywords
metal component
current density
anode
voltage
support structures
Prior art date
Application number
PCT/EP2018/084041
Other languages
German (de)
English (en)
Inventor
Wolfgang Hansal
Selma Hansal
Gabriela SANDULACHE
Original Assignee
Hirtenberger Engineered Surfaces Gmbh
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 Hirtenberger Engineered Surfaces Gmbh filed Critical Hirtenberger Engineered Surfaces Gmbh
Publication of WO2019110826A2 publication Critical patent/WO2019110826A2/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/04—Etching of light metals
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/60—Treatment of workpieces or articles after build-up
    • B22F10/62—Treatment of workpieces or articles after build-up by chemical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/08—Etching of refractory metals
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • 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
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/241—Chemical after-treatment on the surface
    • 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
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a method for removing metallic support structures, sintered cake and / or Ableitfahen on an additively manufactured metal component, wherein the metal component is treated electrolytically in an acidic electrolyte, wherein the metal component is operated as an anode for a defined period of time. Furthermore, the invention relates to an electrolytic cell comprising an acidic electrolyte.
  • metal powder layers are selectively solidified by the energy of a laser or electron beam.
  • complex metal components can be produced with such production methods, with support structures being required, depending on the geometric shape, remaining behind.
  • a sinter cake may also remain on the metal component.
  • the raw metal component is provided with scavenging vanes to dissipate heat in respective component regions to avoid high temperature gradients during fabrication.
  • GB 2 543 058 A1 describes an electrochemical method for smoothing a metal component which has been made additive, wherein very high electrical voltages are used and different electrolytes of inorganic salts, inorganic acids or inorganic bases up to 25% by weight are added.
  • Object of the present invention is therefore to provide a method of the type described above, with which selectively support structures, sinter cake or Ableitfahen can be removed on the additively manufactured metal component.
  • This object is achieved by a method for removing metallic support structures, sinter cake and / or Ableitfahen on an additively manufactured metal component, wherein the metal component is treated electrolytically in an acidic electrolyte, wherein the metal component is operated as an anode over a defined period of time, characterized in that, over the defined period of time, a higher voltage is applied alternately alternately to the metal component and subsequently a lower voltage or a higher current density and subsequently a lower current density.
  • the entire period of the treatment is between 10 and 120, preferably 20 and 70 minutes, more preferably 30 to 60 minutes.
  • both the higher and the lower voltage amperage can be kept significantly lower than in GB 2,543,058 Al.
  • the lower voltage may be, for example, not more than 30 V, preferably not more than 10 V.
  • the higher voltage may e.g. not more than 60 V, preferably not more than 40 V.
  • the electrolyte must be acidic. Particularly good results have been achieved when the acidic electrolyte contains at least one halide, in particular chloride or fluoride. Chloride is particularly suitable for metal components made of iron (alloys), while fluoride shows good results for all metal components. Preferably, this is added in the form of dissolved HF 2, preferably NH4HF2. Preferably, HF 2 is added to the electrolyte in an amount between 0.5 and 1 mol / l, preferably 0.6 to 1.8 mol / l. The concentration of F is therefore preferably between 1 and 2 mol / l, preferably 1.2 to 1.6 mol / l.
  • the acidic electrolyte contains a sulfate or sulfonate.
  • the sulfate may be added, for example, in the form of sulfuric acid or a salt thereof.
  • Suitable sulfonate is, for example, methylsulfonic acid or a salt thereof.
  • the electrolyte contains a strong acid.
  • Preferred examples are sulfuric acid or nitric acid.
  • the electrolyte preferably contains at least 30% by volume of acid.
  • the method has proved particularly suitable for metal components and metallic support structures made of titanium or a titanium alloy.
  • An example of a suitable alloy would be TiAl6V4.
  • Other metals also suitable include aluminum alloys, nickel base alloys (preferably Inconel) or iron alloys.
  • sinter cake, support structures and metal component consist of the same metal.
  • the support structure, the sinter cake or the Ableitfahen were completely removed, while the geometry of the metal component itself was completely retained.
  • a metal component made of TiAl6V4 alloy (LPBF) was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • a metal component made of the TiAl6V4 (EBM) alloy was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • Step 1 The metal component was electrolyzed at 5V for 30 minutes.
  • Step 2 Over a period of 5 minutes at room temperature, the stress on the metal component was changed as follows:
  • a metal component made of TiAl6V4 alloy (LPBF) was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • Step 1 The metal component was electrolyzed at 5V for 30 minutes.
  • Step 2 Over a period of 5 minutes at room temperature, the stress on the metal component was changed as follows:
  • a metal component made of the TiAl6V4 (EBM) alloy was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • a metal component made of TiAl6V4 alloy (LPBF) was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • a metal component made of the alloy TiAl6V4 (EBM), the metal component after additive production in a solution was pretreated without electricity at room temperature for 20 minutes.
  • the solution contained the following components.
  • Step 2 The pretreated metal component was dissolved in an electrolyte of the composition 60% by volume of water
  • a metal alloy AlSilO Mg (LPBF) alloy was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • a metal alloy AlSilO Mg (LPBF) alloy was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • Example 9 Removal of Support Structures from a Metal Component Made of a Nickel-Based Inconel 718® (LPBF)
  • a metal component made of the nickel-based alloy Inconel 718® (LPBF) was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • a 316L stainless steel (LPBF) metal component was added to an electrolyte after additive fabrication and operated as an anode.
  • the electrolyte used was:
  • a metal component made of the aluminum alloy AlSilOMg (LPBF) was added to an electrolyte after additive production and operated as an anode.
  • the electrolyte used was:
  • EBM Metal component produced by "electron beam melting"

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Powder Metallurgy (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

Procédé pour retirer des structures de support métalliques, des agglomérats de frittage et/ou des languettes de dissipation thermique sur un élément métallique fabriqué de manière additive, l'élément métallique étant traité par voie électrolytique dans un électrolyte acide, l'élément métallique servant d'anode pendant un intervalle de temps défini, l'élément métallique étant pendant cet intervalle de temps défini le siège de l'application alternée multiple d'une tension élevée puis d'une tension plus faible, ou d'une densité de courant élevée puis d'une densité de courant plus faible.
PCT/EP2018/084041 2017-12-07 2018-12-07 Procédé pour retirer des structures de support métalliques d'un élément métallique fabriqué de manière additive WO2019110826A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATPCT/AT2017/060327 2017-12-07
AT2017060327 2017-12-07

Publications (1)

Publication Number Publication Date
WO2019110826A2 true WO2019110826A2 (fr) 2019-06-13

Family

ID=66749937

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/084041 WO2019110826A2 (fr) 2017-12-07 2018-12-07 Procédé pour retirer des structures de support métalliques d'un élément métallique fabriqué de manière additive

Country Status (1)

Country Link
WO (1) WO2019110826A2 (fr)

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