EP1719566B1 - Mikrowellenbehandlung von MIM-Vorformen - Google Patents

Mikrowellenbehandlung von MIM-Vorformen Download PDF

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Publication number
EP1719566B1
EP1719566B1 EP06252361A EP06252361A EP1719566B1 EP 1719566 B1 EP1719566 B1 EP 1719566B1 EP 06252361 A EP06252361 A EP 06252361A EP 06252361 A EP06252361 A EP 06252361A EP 1719566 B1 EP1719566 B1 EP 1719566B1
Authority
EP
European Patent Office
Prior art keywords
preform
binder
component
mixture
chamber
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.)
Not-in-force
Application number
EP06252361A
Other languages
English (en)
French (fr)
Other versions
EP1719566A3 (de
EP1719566A2 (de
Inventor
Thomas Joseph Kelly
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.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of EP1719566A2 publication Critical patent/EP1719566A2/de
Publication of EP1719566A3 publication Critical patent/EP1719566A3/de
Application granted granted Critical
Publication of EP1719566B1 publication Critical patent/EP1719566B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • 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
    • B22F3/10—Sintering only
    • B22F3/1017—Multiple heating or additional steps
    • B22F3/1021—Removal of binder or filler
    • 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
    • B22F3/10—Sintering only
    • B22F3/1017—Multiple heating or additional steps
    • B22F3/1021—Removal of binder or filler
    • B22F3/1025—Removal of binder or filler not by heating only
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/227—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by organic binder assisted extrusion
    • 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
    • B22F3/10—Sintering only
    • B22F2003/1042—Sintering only with support for articles to be sintered
    • B22F2003/1046—Sintering only with support for articles to be sintered with separating means for articles to be sintered
    • 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
    • B22F3/10—Sintering only
    • B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • B22F2003/1054—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by microwave
    • 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
    • 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

Definitions

  • This invention relates generally to sintered metallic components and more particularly to components sintered by microwave heating.
  • MIM Metal Injection Molding
  • Prior art methods of sintering for MIM preforms require furnace heat treatment at temperatures capable of causing the metal powders to sinter together to make the preform mechanically strong enough for further processing. This is a time consuming process that results in a non uniform product due to the heating process being "from the outside in”, meaning the outer portion of the preform gets more time at high temperature and can sinter earlier causing voids to be trapped inside the preforms. This can also result in non-uniform mechanical properties.
  • US 4,478,790 discloses a method of manufacturing molded articles of metal alloys.
  • a powder of the alloy, or a blend of powders of alloy constituents is mixed with one or more plastics, the plastic content amounting to about 30% to 50% by volume.
  • US 2002/0167118 discloses a method to fabricate nanostructures containing isotropically distributed, interconnected pores having cross-sectional diameters in the nanometer and Angstrom range.
  • Figure 1 depicts a compressor blade 10 for a gas turbine engine not rotated to the present invention.
  • the compressor blade 10 comprises an airfoil 12 having a leading edge 14, a trailing edge 16, a tip 18, a root 19, and opposed sides 20 and 22.
  • An arcuate inner platform 24 is attached to the root 19 of the airfoil 12.
  • a dovetail 26 extends downward for mounting the blade 10 in a rotor slot.
  • the compressor blade 10 is made from a metal alloy suitable for the intended operating conditions.
  • Figure 2 depicts a method for producing a metallic component. Initially, as shown in block 28, a metallic powder and a suitable binder are provided.
  • the metallic powder may be a single alloy or it may be a mechanical mixture of more than one alloy.
  • the particle size of the metallic powder should be about 100 micrometers or less
  • known alloys suitable for constructing compressor blades include titanium alloys such as Ti-6AI-4V, nickel-based alloys such as INCO 718 or UDIMENT 720, and iron-based alloys such as A286.
  • the binder may be any material which is chemically compatible with the metallic powder and which allows the required processing (e.g. mixing, injection, solidification, and leaching).
  • suitable binders include waxes and polymer resins.
  • the binder may be provided in a powder form
  • the binder and the metallic powder are thoroughly mixed together, as shown in block 30.
  • the mixture is then heated to melt the binder and create a fluid with the metallic powder coated by the binder (block 32).
  • the mixture is formed into a predetermined shape at block 34.
  • One way, which does not form part of the invention, of forming the mixture is to use a known injection-molding apparatus.
  • a schematic view of an injection molding apparatus 36 including a hopper 38 and an extruder 40 with rotating screw 42 is shown in Figure 3 .
  • the mixture is extruded into the cavity 44 of a mold 46.
  • the mold 46 may optionally be heated to avoid excessively rapid solidification of the binder which would result in a brittle preform 48.
  • the mixture could be molded in a continuous manner using known injection molding equipment capable of melting the binder as it passes through the screw 42. Once the mixture has solidified, the mold 46 is opened as shown in Figure 4 and the resulting uncompacted or "green" preform 48 is removed (see block 50 in Figure 2 ).
  • the preform 48 comprises metal particles suspended in the solidified binder.
  • the preform 48 is not suitable for use as a finished component, but merely has sufficient mechanical strength to undergo further processing.
  • the preform 48 is leached to remove the majority of the binder. This may be done by submerging or washing the preform 48 with a suitable solvent which dissolves the binder but does not attack the metallic powder.
  • the preform 48 is microwave sintered.
  • the preform 48 is placed in a chamber 56 which includes means for creating a suitable atmosphere to prevent undesired oxidation of the preform 48 or other reactions during the sintering process.
  • a supply 58 of inert gas such as argon is connected to the interior of the chamber 56.
  • the sintering could also be performed under a vacuum.
  • a microwave source 60 such as a known type of cavity magnetron with an output in the microwave frequency range is mounted in communication with the chamber 56.
  • the microwave spectrum covers a range of about 1 GHz to 300 GHz. Within this spectrum, an output frequency of about 2.4 GHz is known to couple with and heat metallic particles without passing through solid metals.
  • the microwave source 60 is activated to irradiate the preform 48.
  • the microwave source 60 is depicted as having a direct line-of-sight to the entire preform 48.
  • the chamber 56 which would typically be metallic, so that the preform is heated by a combination of direct and reflected microwaves. Because of the small metallic particle size in the preform 48, the microwaves 62 couple with the particles and heat them.
  • the preform 48 is heated to a temperature below the liquidus temperature of the metallic powder and high enough to cause the metallic powder particles to fuse together and consolidate. The high temperature also melts and drives out any remaining binder.
  • the preform 48 is held at the desired temperature for a selected time period long enough to result in a consolidated compressor blade 10.
  • the heating rate (i.e. the output wattage of the microwave source) is selected depending on variables such as the mass of the preform 48, the shape of the chamber 48 and the and the desired cycle time of the sintering process.
  • the combination, which does not form part of the present invention, of the MIM-formed preform 48 with the microwave sintering step gives the compressor blade 10 a significantly greater density, that is, freedom from voids, in less time.
  • the compressor blade 10 When the sintering cycle is complete, the compressor blade 10 is removed from the chamber 56 and allowed to cool. When required, the compressor blade 10 may be subjected to further consolidation using a known hot isostatic pressing ("HIP") process to result in a substantially 100% dense component, as noted in block 63 of Figure 2 . If desired, the compressor blade 10 may be subjected to additional processes such as final machining, coating, inspection, etc. in a known manner (see block 64 of Figure 2 ).
  • HIP hot isostatic pressing
  • Figures 6 and 7 illustrate an alterative method suitable for producing continuous components.
  • the metallic powder may be a single alloy or it may be a mechanical mixture of more than one alloy.
  • the particle size of the metallic powder should be about 100 micrometers or less in diameter. This process is particularly suitable for alloys which are difficult to cold work and which are ordinarily cast. Examples of such alloys include so-called "superalloys" based on nickel or cobalt and containing a high percentage of a gamma-prime phase component. Examples of such alloys include RENE 77, RENE 80, and RENE N4 and N5 nickel-based alloys.
  • the binder may be any material which is chemically compatible with the metallic powder and which allows the required processing (e,g: mixing, injection, solidification, and leaching).
  • suitable binders include waxes and polymer resins.
  • the binder may be provided in a powder form.
  • FIG. 6 A schematic view of an injection molding apparatus 136 including a hopper 138 and an extruder 140 with rotating screw 142 is shown in Figure 6 .
  • the mixture is extruded through a die 144 of a known type to produce a continuous preform 148 of a constant cross-section.
  • a die 144 having a circular opening of about 1.27 mm (0.050 in.) in diameter may be used to produce a preform 148 for use as a welding filler wire.
  • the die 144 may optionally be heated to avoid excessively rapid solidification of the binder which would result in a brittle preform 148.
  • the conveyor belt 150 carries the preform 148 through a solvent bath 152 which leaches the majority of the binder out of the preform 148. This may be done with a suitable solvent which dissolves the binder but does not attack the metallic powder.
  • the preform 148 then passes into a sintering chamber 156 where it is microwave sintered.
  • the chamber 156 includes means for creating a suitable atmosphere to prevent undesired oxidation of the preform 148 or other reactions during the sintering process.
  • a supply 158 of inert gas such as argon, or a gas fore creating a reducing atmosphere such as hydrogen is connected to the interior of the chamber 156.
  • the processing could also be performed under a vacuum.
  • a microwave source 160 similar to the source 60 described above is mounted in communication with the chamber 156. The microwave source 160 is activated to irradiate the preform 148. Because of the small metallic particle size in the preform 148, the microwaves couple with the particles and heat them.
  • the preform 148 As the preform 148 passes through the chamber 156, it is heated to a temperature below the liquidus temperature of the metallic powder and high enough to cause the metallic powder to fuse together and consolidate. The high temperature also melts and drives out any remaining binder.
  • the heating rate i.e. the output wattage of the microwave source
  • the speed of the conveyor belt 150 are selected so that the preform 148 is held at the desired temperature for a selected time period long enough to result in a consolidated completed component 162.
  • Figure 7 illustrates a short section of the component 162, which in this case is a welding filler wire 162.
  • the combination of the MIM-formed preform 148 with the microwave sintering step gives the filler wire 162 a significantly greater density, that is, freedom from voids, in less time.
  • the component 162 passes out of the chamber 156 and allowed to cool. If desired, the product 162 may be subjected to additional processes such as coating, inspection, etc. in a known manner.
  • the welding filler wire 162 is subjected to further consolidation using a known hot isostatic pressing ("HIP") process to result in a substantially 100% dense component. As shown in Figure 8 ; this step is facilitated by winding the welding filler wire 162 on to a spindle 164, with a small spacing "S” between the individual coils. The loaded spindle 164 is then placed into a chamber (not shown) for the HIP process.
  • HIP hot isostatic pressing
  • the continuous process described above may be used to produce any other type of component with a constant cross-section.
  • the process may be used to produce sheet materials. As shown schematically in Figure 9 , this may be done by providing a die 244 of the desired width "W" for extruding a wide, thin preform 248. In order to supply an adequate feed of a binder-metallic power mixture to the die 244, a plurality of side-by side injection molding apparatuses 236 may be provided. The extruded preform 248 is then leached and microwave sintered as described above, to result in a metallic sheet 262, shown in Figure 10 .
  • the metallic sheet 262 is subjected to further consolidation using a HIP process to result in a substantially 100% dense component. As shown in Figure 10 , this step is facilitated by winding the metallic sheet on to a spindle 264. A release compound is placed between the layers of the metallic sheet 262 to prevent undesired consolidation and diffusion bonding of the layers. The loaded spindle 264 is placed into a chamber (not shown) for the HIP process.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (6)

  1. Verfahren zur Herstellung einer metallischen Komponente, umfassend:
    die Bereitstellung (28) eines Gemisches aus einem metallischen Pulver und einem Bindemittel;
    das Schmelzen (32) des Bindemittels und das Formen des Gemisches zu einer Vorform (48) in der Form der genannten Komponente;
    das Entfernen (52) eines Großteils des Bindemittels aus der Vorform (48) und
    das Erwärmen (54) der Vorform (48) durch Mikrowellenenergie, um die Bindemittelüberreste zu entfernen, und das Sintern des Metallpulvers, um die genannte Komponente zu bilden;
    wobei der Schritt des Formens des Gemisches zu einer Vorform (48) das Strangpressen des Gemisches durch eine Matrize (144, 244) mit einer gewünschten Querschnittsform umfasst,
    wobei das Verfahren ferner umfasst:
    das Wickeln eines Stückes der Komponente auf eine Spindel (164, 264), wobei zwischen benachbarten Lagen der Komponente ein Trennmittel angeordnet ist;
    die Platzierung der Spindel (164, 264) in einer Kammer und
    die Anwendung (63) eines heißisostatischen Pressverfahrens auf die Komponente.
  2. Verfahren nach Anspruch 1, wobei der Großteil des Bindemittels durch Waschen der Vorform (48) mit einem Lösemittel entfernt wird, das dafür ausgewählt ist, das Bindemittel, nicht aber das metallische Pulver aufzulösen.
  3. Verfahren nach einem der vorangehenden Ansprüche, wobei die Vorform (48) in einer Kammer (56) angeordnet ist, in der während der Erwärmung eine kontrolliert zusammengesetzte Atmosphäre herrscht.
  4. Verfahren nach einem der vorangehenden Ansprüche, wobei die Vorform (48) während der Erwärmung unter Vakuum gehalten wird.
  5. Verfahren nach einem der vorangehenden Ansprüche, wobei die Vorform (48) nacheinander von der Matrize (144, 244) durch ein Lösemittelbad (152) transportiert wird, um das Bindemittel auszuwaschen, und danach zu einer Kammer (156), in der die Mikrowellenerwärmung durchgeführt wird.
  6. Verfahren nach einem der vorangehenden Ansprüche, wobei die Matrize (144, 244) eine längliche Querschnittsform aufweist, die für die Herstellung einer blechartigen Vorform eingerichtet ist.
EP06252361A 2005-05-05 2006-05-04 Mikrowellenbehandlung von MIM-Vorformen Not-in-force EP1719566B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/908,292 US20060251536A1 (en) 2005-05-05 2005-05-05 Microwave processing of mim preforms

Publications (3)

Publication Number Publication Date
EP1719566A2 EP1719566A2 (de) 2006-11-08
EP1719566A3 EP1719566A3 (de) 2007-04-04
EP1719566B1 true EP1719566B1 (de) 2009-08-05

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Family Applications (1)

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EP06252361A Not-in-force EP1719566B1 (de) 2005-05-05 2006-05-04 Mikrowellenbehandlung von MIM-Vorformen

Country Status (7)

Country Link
US (1) US20060251536A1 (de)
EP (1) EP1719566B1 (de)
JP (1) JP2006312784A (de)
BR (1) BRPI0601718A (de)
CA (1) CA2545699C (de)
DE (1) DE602006008208D1 (de)
SG (2) SG147458A1 (de)

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FR2913900B1 (fr) * 2007-03-22 2009-04-24 Commissariat Energie Atomique Procede de fabrication de pieces par pim ou micropim
CN104117677B (zh) * 2013-04-23 2017-02-08 昆山广兴电子有限公司 一种金属扇轮的制造方法
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US10000011B1 (en) 2016-12-02 2018-06-19 Markforged, Inc. Supports for sintering additively manufactured parts
US10800108B2 (en) 2016-12-02 2020-10-13 Markforged, Inc. Sinterable separation material in additive manufacturing
CA3040921C (en) 2016-12-06 2024-02-20 Markforged, Inc. Additive manufacturing with heat-flexed material feeding
CN109014176A (zh) * 2018-08-07 2018-12-18 深圳市铂科新材料股份有限公司 一种燃气涡轮发动机叶片的制备方法
CN109277574B (zh) * 2018-11-23 2021-06-22 湖南英捷高科技有限责任公司 一种空调压缩机摇块的制备方法
EP3907022A1 (de) * 2020-05-08 2021-11-10 Siemens Aktiengesellschaft Verfahren zur herstellung einer materiallage
DE102020216193A1 (de) * 2020-12-17 2022-08-11 Rolls-Royce Deutschland Ltd & Co Kg Schaufelbauteil, Verfahren zu dessen Herstellung und Gasturbine

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Publication number Publication date
JP2006312784A (ja) 2006-11-16
CA2545699A1 (en) 2006-11-05
BRPI0601718A (pt) 2006-12-26
US20060251536A1 (en) 2006-11-09
CA2545699C (en) 2015-10-20
SG126932A1 (en) 2006-11-29
DE602006008208D1 (de) 2009-09-17
SG147458A1 (en) 2008-11-28
EP1719566A3 (de) 2007-04-04
EP1719566A2 (de) 2006-11-08

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