Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/10—Alloys containing non-metals
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/10—Alloys containing non-metals
  • C22C1/1084—Alloys containing non-metals by mechanical alloying (blending, milling)
• • 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
  • B22F3/02—Compacting 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
  • B22F3/02—Compacting only
  • B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
• • 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
  • B22F3/14—Both compacting and sintering simultaneously
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/04—Making non-ferrous alloys by powder metallurgy
  • C22C1/05—Mixtures of metal powder with non-metallic powder
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
  • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
  • C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
  • C22C32/0063—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides based on SiC
• • 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

• the present invention relates to a method for preparing Metallic Matrix Composites (CMMs).
• CMMs are mainly used for the manufacture of metal parts in the field of aeronautics such as rotor parts for helicopters.
• the coining of the CMM parts is performed from billets of several tens of kilograms which are obtained by compaction of previously mixed powders.
• the main compaction step is performed by uniaxial pressing leading to the formation of strata in the billets which is disadvantageous for the mechanical properties of the metal parts obtained from these billets.
• the method of the invention overcomes the aforementioned drawbacks and is essentially characterized in that it comprises at least the steps of: (a) cold isostatic compaction of previously mixed powders 5, and
• step (b) hot uniaxial pressing of the compact 12 obtained in step (a).
• the powders are dry blended in a suitable mixer subjected to a pressurized gas comprising a neutral gas and oxygen.
• the dry powder mixture has the advantage of being more economical than a wet mixing process and the presence of a neutral gas makes it possible to avoid the risks of explosion present during dry mixing.
• the pressure in the mixer is between 15 and 25 mbar, the neutral gas is nitrogen and the oxygen level is controlled and between 5 and 10%.
• the pressure in the mixer is 20 mbar and the oxygen level is 6%.
• the powder mixture is composed of an aluminum alloy reinforced with particles such as, for example, particles of silicon carbide, boron carbide, alumina, or any other ceramic material.
• the powder mixture comprises 94.7% by weight of aluminum, 4% by weight of copper, 1.3% by weight of magnesium and 15% by volume of silicon carbide.
• the powder mixture 5 undergoes a vibrating table pressing operation prior to step (a) of isostatic compaction.
• the gas contained in the mixture of packed powders 5 can be pumped out in order to obtain a solid compact 12.
• the compaction fluid advantageousously, it comprises water and lubricating additives.
• the pressure of the compaction fluid 15 is between 1500 and 4000 Bars and more preferably the pressure is 2000 Bars.
• step (a) undergoes a degassing operation at a temperature between 100 and 450 0 C, preferably 44O 0 C.
• step (b) uniaxial pressing to The heating is carried out at a temperature of between 400 and 600 ° C., preferably at a temperature of 450 ° C., and at an applied pressure of between 1000 and 3000 bar, preferably of 1800 bar.
• the billet 22 obtained in step (b) is extruded while hot.
• the invention also relates to the billet 22 obtained by the method described above.
• the hermetic insulation means 7, 10, 11 comprise at least one plug 7 made of an elastically deformable material force-fitted into the sheath 1.
• the hermetic insulation means 7, 10, 11 comprise the upper edge 10 of the sheath 1 which is folded towards the bottom of the sheath 1 forming an annular rim 11 resiliently bearing against the outer face 13a of the side wall 13 of the perforated container 2.
• the sheath 1 and the perforated container 2 are, prior to the step (a) of isostatic compaction, removably arranged in a cylindrical container 3.
• FIG. 1 is an exploded perspective view of the device of the invention allowing the evacuation of residual gases prior to step a) of isostatic compaction;
• Figure 2 is a sectional view along the line II -II of Figure 1 of the device of Figure 1 assembled;
• Figure 3 is an identical view of the device of Figure 2 without the container and thus disposed in the isostatic press;
• Figure 4 is a view of the device during the degassing step;
• Figure 5 is a sectional view of the uniaxial pressing device.
• the exemplary embodiment presented hereinafter adapts, without limitation, to the preparation of aluminum matrix composites reinforced with silicon carbide particles.
• a mixture of pre-alloyed powders composed of 94.7% by weight of aluminum, 4% by weight of copper, 1.3% by weight of magnesium and 15% by volume of silicon carbide is dry blended in a grinder. chicken or in a conventional mixer of powders.
• the surrounding atmosphere comprises a neutral gas such as nitrogen at a pressure of between 15 and 25 mbar, preferably 20 mbar, as well as oxygen at a rate of between 5 and 10%, preferably 6%.
• a neutral gas such as nitrogen at a pressure of between 15 and 25 mbar, preferably 20 mbar, as well as oxygen at a rate of between 5 and 10%, preferably 6%.
• An approximately cylindrical nitrile plug 7 is force-fitted into the sheath 1 leaving the annular edge 11 protruding as previously described.
• the device assembly for isostatic compaction 14 constituted by the compact 12, the sheath 1, the pierced container 2 and the plug 7 are extracted from the container 3, the seal being retained by the elasticity of the sheath 1 allowing, simultaneously with the extraction of the device 14 from the container 3 , that the annular edge 11 is pressed against the external face 13a of the side wall 13 of the perforated container 2.
• the rate of rise in pressure during this step is between 20 and 50 bar per minute and the holding time at the aforementioned maximum pressure is at least one minute.
• the compact 12 obtained after the isostatic compaction operation has a density of about 85%.
• the sheath 1 is extracted from the perforated container 2 and the outside of the sheath 1 and the stopper 7 are thoroughly cleaned in order to avoid any contact between the compaction liquid 15 and the compact 12. Then, the sheath 1 and the plug 7 are removed and the residues of the filter 9 are, if necessary, removed by grinding or polishing the upper part of the compact 12.
• the compact 12 is then placed in an aluminum tubular container 17 having a bottom wall 18.
• the container 17 is sealed by welding an opposite aluminum top wall 19 having an orifice 20 in which is welded a tube 21 intended to be connected to a vacuum pump.
• a vacuum draw is performed for about 30 minutes after checking the tightness of the aluminum container 17 and, while continuing to pump, the container 17 is placed in an oven at about 440 0 C for about 12 hours for undergo a degassing operation.
• the tube 21 is closed at about 10-20 cm from the upper wall 19.
• the aluminum container 17 containing the compact 12 is then rapidly placed in a tool 23 preheated to a temperature above 300 ° C., preferably between 400 and 600 ° C., advantageously at 450 ° C., so that the compact 12 does not cool after the degassing step.
• the tooling 23 comprises a central cylindrical bore 24 of diameter approximately equal to the diameter of the container 17 so as to be able to insert the container 17 in the said bore 24.
• the container 17 rests on a die ejector forming part 25, for reasons explained after that which is firmly and removably attached to the inner face 26 of the central bore 24.
• a punch 27 then applies a pressure of between 1000 and 3000 Bars, preferably 1800 Bars on the container 22 in the vertical direction indicated by the arrow 28 until the punch 27 no longer moves, the pressure reached being then held for about a minute. Applying vertical pressure allows the die to be centered relative to this pressure.
• the punch 27 is removed and the billet 22, consisting of the compact 12 in the aluminum container 17 after the uniaxial pressing operation, is ejected from the tool 23 by an ejector 29 disposed on the side opposite the punch 27 by applying pressure in the direction of the arrow 20.
• the ejection of the billet 22 from the top of the tooling is made possible by the movable die ejector 25 which slides in the central bore 24. A mechanical peeling is then performed in order to remove the aluminum layer of the container around the billet 22.
• the billet 22 can then be machined to produce a metal part of any form by forging, machining or any other known technique.
• the silicon carbide particles are uniformly distributed in the resulting billet which thus has improved mechanical properties.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Powder Metallurgy (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2005
  • 2005-03-14 FR FR0502481A patent/FR2882948B1/fr active Active
• 2006
  • 2006-03-14 EP EP06726090A patent/EP1858663A2/fr not_active Ceased
  • 2006-03-14 KR KR1020077021055A patent/KR101366721B1/ko not_active IP Right Cessation
  • 2006-03-14 RU RU2007134055/02A patent/RU2449035C2/ru not_active IP Right Cessation
  • 2006-03-14 CN CN2006800081407A patent/CN101142045B/zh active Active
  • 2006-03-14 UA UAA200710273A patent/UA90300C2/uk unknown
  • 2006-03-14 US US11/817,335 patent/US8329093B2/en active Active
  • 2006-03-14 WO PCT/FR2006/000564 patent/WO2006097622A2/fr active Application Filing
  • 2006-03-14 MX MX2007011128A patent/MX2007011128A/es active IP Right Grant
  • 2006-03-14 CA CA2600274A patent/CA2600274C/fr not_active Expired - Fee Related
  • 2006-03-14 BR BRPI0609329-9A patent/BRPI0609329B1/pt not_active IP Right Cessation
  • 2006-03-14 JP JP2008501366A patent/JP5243235B2/ja not_active Expired - Fee Related
• 2007
  • 2007-09-06 ZA ZA200707675A patent/ZA200707675B/xx unknown
• 2008
  • 2008-08-14 HK HK08109022.5A patent/HK1117791A1/xx not_active IP Right Cessation

Non-Patent Citations (1)

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