EP0060167A1 - Procédé de fabrication de pièces métalliques par moulage et frittage d'une poudre d'alliage métallique - Google Patents

Procédé de fabrication de pièces métalliques par moulage et frittage d'une poudre d'alliage métallique Download PDF

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Publication number
EP0060167A1
EP0060167A1 EP82400294A EP82400294A EP0060167A1 EP 0060167 A1 EP0060167 A1 EP 0060167A1 EP 82400294 A EP82400294 A EP 82400294A EP 82400294 A EP82400294 A EP 82400294A EP 0060167 A1 EP0060167 A1 EP 0060167A1
Authority
EP
European Patent Office
Prior art keywords
preform
mold
sintering
isostatic pressure
phase
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Withdrawn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
EP82400294A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Pierre Trottier
Michel Jeandin
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.)
Association pour la Recherche et le Developpement des Methodes et Processus Industriels
Safran Aircraft Engines SAS
Original Assignee
Association pour la Recherche et le Developpement des Methodes et Processus Industriels
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
SNECMA SAS
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 Association pour la Recherche et le Developpement des Methodes et Processus Industriels, Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA, SNECMA SAS filed Critical Association pour la Recherche et le Developpement des Methodes et Processus Industriels
Publication of EP0060167A1 publication Critical patent/EP0060167A1/fr
Withdrawn legal-status Critical Current

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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
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • B22F3/1258—Container manufacturing

Definitions

  • the invention relates to a method of manufacturing shaped metal parts by molding and sintering a metal alloy powder.
  • the expression "of shape” means that the parts obtained by the process are in the desired shapes and dimensions and do not have to then undergo a shaping treatment by mechanical deformation.
  • the expression "metal alloy powder” means that the powder used is a powder of alloy grains whose composition is not substantially modified by the execution of the process.
  • Processes of this kind are already known. In principle, they can advantageously be substituted for obtaining metal parts of complex shape made of superalloys or titanium alloys, to processes using mass machining or isothermal forging in the superplastic phase because they do not have the drawbacks thereof, such as significant losses of material, or else number and duration of operations, cost and complexity of tools, etc.
  • the heating temperature during the shaping phase must reach a value such that a liquid phase appears in the contact zones of the grains. But if this temperature becomes too high, the proportion of molten and resolidified alloy becomes too high, the resistance to deformation by compression of the preform becomes too high and isostatic pressing is ineffective.
  • the range of suitable temperatures is therefore very narrow and difficult to respect.
  • the densification during this conformation phase reaches a significant value and causes a shrinkage whose value is very close to the total shrinkage due to the two phases. In other words, it is during the conformation phase that most of the withdrawal occurs.
  • said preform no longer follows the shapes of the mold. Indentation cracks may also appear. It is therefore not possible to obtain sound parts which must have both a complex shape and precise dimensions.
  • the object of the invention is to avoid these drawbacks.
  • the process of the invention which includes, like the process of the prior art which has just been described, the shaping phase and the compacting and sintering phase which have been defined at the beginning of this description, is characterized in that the temperature and duration conditions of the shaping phase are such that the preform is not only porous, but that its pores remain open and in that, for the execution of the compacting and sintering phase, the preform is previously housed in a waterproof and deformable metal envelope on which the isostatic pressure is applied.
  • the temperature and duration conditions are such that the grains of alloy powder are bonded to each other by their initial contact points, for example by intersolid diffusion. There is no merger, and therefore no consolidation.
  • the range of permissible temperatures is much wider than in the method of the aforementioned prior art.
  • the temperature can be adjusted between a lower limit above which diffusion begins and an upper limit above which melting begins.
  • the conformation conditions are therefore much less critical.
  • the shrinkage during this shaping phase is much lower and most of the total shrinkage is carried out during the compaction and sintering phase.
  • the preform faithfully follows the walls of the mold and there is no risk of cracks appearing while the withdrawal during the second phase is practically isotropic. It is sufficient that the envelope is deformable enough to apply against all the parts of the preform.
  • Compaction deforms the mold (whether it is metallic or ceramic) and one must therefore use a mold by roughing.
  • the mold must also meet contradictory requirements since it must be rigid enough to withstand the deformation phase without deformation and sufficiently deformable to apply against the preform during the compacting and sintering phase. This is why said method of the prior art allows only blanks to be produced.
  • the process of the invention makes it possible to produce parts of complex shape and to reuse, if desired, the shaping mold.
  • the method of the invention excludes the presence of a binder (such as zinc stearate) due to the use of a sealed envelope during isostatic pressing.
  • a binder such as zinc stearate
  • the method of the invention finds particular application for the production of parts from titanium powders for which heat treatment is necessary. Indeed, in this particular case, it is possible to carry out a treatment of the powders at high temperature, with respect to the compaction temperature, when the preform is produced, for example under vacuum in a ceramic mold. This high-temperature treatment can be carried out at the same time or after the powder bonding phase. This is made possible by the fact that the ranges of bonding temperatures and heat treatment are similar.
  • FIG. 1 shows the conformation mold 10 made of ceramic, in which the molding imprint 11 is formed, into which the filling funnel 12 opens, through which the charge of alloy powder 20 is introduced.
  • the filling is made uniform. for example by. mold vibration.
  • the quantity of alloy powder to be introduced is measured by weighing and is such that, when the filling is complete, the powder charge is flush with the upper limit 13 of the imprint.
  • the mold 10 can be non-removable and non-recoverable or, as in Figure 1, removable and recoverable. It is here constituted by a lower part of mold 14 and by an upper part of mold 15 separated by a joint plane 16.
  • the filled mold 10 is then placed in an oven, not shown, to undergo heating therein intended to agglomerate the grains of powder in order to obtain the preform.
  • the heating temperature is, for information, from 1100 to 1250 * C, the heating time being for example 1 hour.
  • FIG. 2 shows the preform 20 produced and removed from the mold.
  • FIG. 3 shows the preform 20 housed in the casing 30 intended to apply the isostatic pressure during the compaction treatment.
  • the casing 30 is a thin casing made of waterproof metallic material and easily deformable under the conditions of treatment, for example made of extra mild steel strip.
  • this envelope consists of two envelope parts 31 and 32 each in the form of a plate. They are provided with circular flanges 33 and 34 allowing a tight assembly by welding.
  • two pipes 35 which are possibly present to ensure after welding the pumping of air and the introduction of an inert atmosphere (for example nitrogen) not likely to form with the alloy used an altering compound substantially the mechanical properties of the part obtained.
  • an inert atmosphere for example nitrogen
  • Figure 4 shows the envelope 30 and the preform 20 housed in the autoclave (not shown) used for compaction and sintering. Isostatic pressure that applies the envelope containing the preform is symbolized by arrows.
  • FIG. 5 shows the part 40 obtained after ablation of the envelope 30, this ablation being for example carried out by selective chemical attack.
  • the mold 10 is used only during the shaping phase and the casing 30 is used only during the compacting and sintering phase, their production and the choice of the materials which constitute them do not pose any particular problems.
  • the mold 10 can be made of ceramic, whether it is monolithic or removable.
  • the envelope 30, it can in most cases be made of extra-mild steel strip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
EP82400294A 1981-02-27 1982-02-19 Procédé de fabrication de pièces métalliques par moulage et frittage d'une poudre d'alliage métallique Withdrawn EP0060167A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8103904 1981-02-27
FR8103904A FR2500774A1 (fr) 1981-02-27 1981-02-27 Procede de fabrication de pieces metalliques par moulage et frittage d'une poudre d'alliage metallique

Publications (1)

Publication Number Publication Date
EP0060167A1 true EP0060167A1 (fr) 1982-09-15

Family

ID=9255673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400294A Withdrawn EP0060167A1 (fr) 1981-02-27 1982-02-19 Procédé de fabrication de pièces métalliques par moulage et frittage d'une poudre d'alliage métallique

Country Status (4)

Country Link
US (1) US4435360A (US06236872-20010522-M00003.png)
EP (1) EP0060167A1 (US06236872-20010522-M00003.png)
JP (1) JPS57203702A (US06236872-20010522-M00003.png)
FR (1) FR2500774A1 (US06236872-20010522-M00003.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4752424A (en) * 1986-01-30 1988-06-21 Kabushiki Kaisha Toshiba Method of manufacturing a rare earth oxysulfide ceramic
US5147086A (en) * 1990-08-08 1992-09-15 Kabushiki Kaisha Kobe Seiko Sho Preparation of capsule for use in isostatic pressing treatment
CN108480643A (zh) * 2018-03-05 2018-09-04 北京科技大学 一种3d冷打印制备复杂形状的金属结构件的方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3343210C1 (de) * 1983-11-30 1985-01-10 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln Verfahren und Vorrichtung zur Herstellung verdichteter Formkoerper
JPS62278240A (ja) * 1986-05-23 1987-12-03 Agency Of Ind Science & Technol Ｔｉ−Ａｌ系金属間化合物部材の成形法
US4961767A (en) * 1987-05-20 1990-10-09 Corning Incorporated Method for producing ultra-high purity, optical quality, glass articles
US5096518A (en) * 1989-02-22 1992-03-17 Kabushiki Kaisha Kobe Seiko Sho Method for encapsulating material to be processed by hot or warm isostatic pressing
JPH0730201U (ja) * 1993-11-05 1995-06-06 博 岡本 古紙の回収用収納箱
US9101984B2 (en) 2011-11-16 2015-08-11 Summit Materials, Llc High hardness, corrosion resistant PM Nitinol implements and components
CN103130678A (zh) * 2013-03-12 2013-06-05 东力（南通）化工有限公司 质量浓度为40%的甲基肼水溶液提浓至98%的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH316476A (de) * 1952-06-13 1956-10-15 Ici Ltd Verfahren zum Schützen von aus Metallpulver gebildeten Körpern gegen Oxydation
FR2258921A1 (US06236872-20010522-M00003.png) * 1974-01-25 1975-08-22 Krupp Gmbh
GB1434930A (en) * 1972-10-13 1976-05-12 Progressive Research Services Powder metallurgy
FR2424783A1 (fr) * 1978-05-02 1979-11-30 Asea Ab Procede pour la fabrication d'un objet a partir de matiere metallique ou ceramique
FR2432358A2 (fr) * 1978-08-03 1980-02-29 Howmet Turbine Components Procede de fabrication de pieces metalliques de forme par metallurgie des poudres

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH316476A (de) * 1952-06-13 1956-10-15 Ici Ltd Verfahren zum Schützen von aus Metallpulver gebildeten Körpern gegen Oxydation
GB1434930A (en) * 1972-10-13 1976-05-12 Progressive Research Services Powder metallurgy
FR2258921A1 (US06236872-20010522-M00003.png) * 1974-01-25 1975-08-22 Krupp Gmbh
FR2424783A1 (fr) * 1978-05-02 1979-11-30 Asea Ab Procede pour la fabrication d'un objet a partir de matiere metallique ou ceramique
FR2432358A2 (fr) * 1978-08-03 1980-02-29 Howmet Turbine Components Procede de fabrication de pieces metalliques de forme par metallurgie des poudres

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4752424A (en) * 1986-01-30 1988-06-21 Kabushiki Kaisha Toshiba Method of manufacturing a rare earth oxysulfide ceramic
US5147086A (en) * 1990-08-08 1992-09-15 Kabushiki Kaisha Kobe Seiko Sho Preparation of capsule for use in isostatic pressing treatment
CN108480643A (zh) * 2018-03-05 2018-09-04 北京科技大学 一种3d冷打印制备复杂形状的金属结构件的方法
CN108480643B (zh) * 2018-03-05 2019-07-09 北京科技大学 一种3d冷打印制备复杂形状的金属结构件的方法

Also Published As

Publication number Publication date
JPH0143001B2 (US06236872-20010522-M00003.png) 1989-09-18
FR2500774B1 (US06236872-20010522-M00003.png) 1984-11-09
JPS57203702A (en) 1982-12-14
FR2500774A1 (fr) 1982-09-03
US4435360A (en) 1984-03-06

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: TROTTIER, JEAN-PIERRE

Inventor name: JEANDIN, MICHEL