EP2546009A2 - Procédé et dispositif de dégagement et de frittage de produits fabriqués en poudre métallurgique - Google Patents

Procédé et dispositif de dégagement et de frittage de produits fabriqués en poudre métallurgique Download PDF

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Publication number
EP2546009A2
EP2546009A2 EP12005084A EP12005084A EP2546009A2 EP 2546009 A2 EP2546009 A2 EP 2546009A2 EP 12005084 A EP12005084 A EP 12005084A EP 12005084 A EP12005084 A EP 12005084A EP 2546009 A2 EP2546009 A2 EP 2546009A2
Authority
EP
European Patent Office
Prior art keywords
products
retort
treatment chamber
sintering
debinding
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Withdrawn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
EP12005084A
Other languages
German (de)
English (en)
Inventor
Francisco Lopez-Lopez
Dieter Schäufler
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.)
Elino Industrie-Ofenbau GmbH
Original Assignee
Elino Industrie-Ofenbau 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 Elino Industrie-Ofenbau GmbH filed Critical Elino Industrie-Ofenbau GmbH
Publication of EP2546009A2 publication Critical patent/EP2546009A2/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Withdrawn legal-status Critical Current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
    • B22F3/10—Sintering only
    • B22F3/1017—Multiple heating or additional steps
    • B22F3/1021—Removal of binder or filler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • 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

Definitions

  • the present invention relates to a process for debinding and sintering powder metallurgy products, especially molded components or precursors thereof, in which the products undergo a residual debinding process in a first treatment chamber and a subsequent sintering process in a second treatment chamber.
  • the invention further relates to a corresponding device.
  • Such products are produced, for example, by the MIM process (Metal Injection Molding), the PIM process (Powder Injection Molding) or CIM process (Ceramic Injection Molding). They usually have to be subjected to a subsequent debindering because they contain residues of binder material from the previous pressing process. Also, for example, pressing aids, spraying aids, lubricants, waxes, etc. adhere to the products or precursors, which must be removed before the subsequent sintering process. With “deliveries” Therefore, it is meant generally the removal of such substances listed above.
  • molded components or precursors thereof i. Powder compacts from a metal powder, to such products.
  • Such powder compacts contain after pressing binder material and form auxiliary material, which must be removed via a debinding process.
  • the powder compacts must be subjected to a sintering treatment. Since the corresponding components or precursors are usually relatively thin and occur until the completion of the products large shrinkage, it is important in the performed for debinding and sintering heat treatments that the components have a homogeneous structure after the treatments and from these treatments no deformations result.
  • the products should have a high dimensional stability and the chemical composition should meet the material specifications.
  • the process described above works perfectly and ensures a good dimensional stability and uniform chemical composition of the products to be produced.
  • the present invention aims to achieve another Improvement of such a method.
  • the invention has for its object to provide a method of the initially reproduced type, which can be carried out particularly quickly and gently with little effort.
  • This object is achieved in a method of the specified type in that the products in the first treatment chamber in addition to the Restentbind réelle a pre-sintering and in the second treatment chamber are only subjected to a residual sintering.
  • the concept according to the invention is thus based on advancing a part of the sintering process into the treatment chamber in which the residual debindering is carried out, so that the first treatment chamber already pre-sintered leaves products which merely have to undergo a residual sintering process or main sintering process.
  • This special type of process management results in advantages in terms of the quality of the products, the duration of the process and / or the effort required for the process.
  • the residual debinding and pre-sintering are carried out while maintaining a hot departmentscrophondung and continuous withdrawal of the resulting condensable exhaust gases.
  • condensation of the exhaust gases resulting from residual removal (possibly due to presintering) within the treatment chamber is prevented, so that no impurities remain in the products or impurities in the products are formed again as a result of the condensation of the exhaust gases. Therefore, the resulting exhaust gases can not condense on the treatment chamber wall and are continuously withdrawn from the chamber via the Restentbind réelleslui or pre-sintering process.
  • a pre-debinding also takes place in the first treatment chamber or is carried out in a separate plant.
  • this pre-debinding is preferably carried out in the same first treatment chamber in which residual debinding and pre-sintering are performed be, preferably under the conditions given above.
  • solvent-based (also water-based) pre-debinding takes place, the pre-debinding process is preferably carried out in a separate plant, and the pre-debinded products are introduced into the first treatment chamber for residual debinding and presintering.
  • the products are restentbindert under continuous gas circulation and pre-sintered and possibly also vorentbindert.
  • the corresponding gases which are circulated in the first treatment chamber, are dependent on the product.
  • these may be air, N 2 , H 2 and other gases as well as corresponding gas mixtures.
  • the first treatment chamber is used for Restentbindern and pre-sintering, possibly also for the Vorentbindern, as stated above, worked with a treatment phase, which follows a corresponding cooling phase.
  • the products are led out of the first treatment chamber and introduced directly or at a time interval into the second treatment chamber for carrying out the residual sintering or main sintering.
  • work is carried out under elevated pressure during the treatment phase.
  • a pre-debinding or drying if such takes place in the first treatment chamber, worked in a temperature range of 60-140 ° C.
  • the residual debinding preferably takes place in a temperature range of 200-600 ° C.
  • the pre-sintering is preferably carried out in a temperature range ⁇ 950 ° C, in particular in a temperature range of 450-900 ° C.
  • the products are preferably cooled to 60-150 ° C.
  • the subsequent remainder / main sintering process can be carried out in the customary manner (in the customary temperature ranges), the process being able to proceed correspondingly more rapidly as a result of the pre-sintering already carried out.
  • the invention further relates to an apparatus for carrying out the method described above.
  • this device is characterized in that the first treatment chamber is arranged in a retort oven which has a retort serving for receiving the products to be retorted, a heating device for heating the retort wall and a device for removing the exhaust gases from the retort.
  • the heating device is used to heat the retort wall during the treatment phase, ie during the residual debinding and presintering. Further, with the means for removing the exhaust gases from the retort the existing there or forming exhaust gases immediately from the retort removed, in a continuous manner over the treatment phase, so that a condensation of the exhaust gases is prevented at the retort wall. It is thus ensured that a perfect Restentbind réelle takes place and the subsequent or at least partially taking place pre-sintering is carried out on pure products that are no longer contaminated with residual binder or other materials.
  • the retort oven preferably has a device for circulating a gas (process gas) within the retort and in particular has an integrated convection system.
  • a gas process gas
  • the retort oven preferably has a device for circulating a gas (process gas) within the retort and in particular has an integrated convection system.
  • a forced circulation system is used.
  • the gas circulation device is expediently equipped with gas guiding devices which surround a product receiving space within the retort and provide the desired loading of the products.
  • the retort oven preferably has cooling means for charging the space outside the retort with a cooling gas so as to initiate a rapid cooling phase after a treatment phase and forcibly cooling the retort.
  • the heating device can be, for example, an electric heater or a gas heater with which the heating chamber, which surrounds the retort wall, is heated.
  • the device for removing the exhaust gases from the retort is preferably formed lance-shaped, with such a lance extends through the furnace wall, the heating chamber, the retort wall into the retort.
  • the retort oven further preferably has a gas introduction device in the retort, which may also be formed in particular lance-shaped.
  • the retort oven is provided with a conventional charge carrier, which is preferably designed so that it can be reacted with the products arranged thereon in an associated sintering furnace in which the residual sintering or main sintering of the products is carried out.
  • a commonly trained sintering furnace can be used.
  • the gas circulation within the retort can take place in the longitudinal direction but also in the transverse direction of the retort.
  • the device is also designed to carry out a predistiltration, this preferably taking place under N 2 and nitric acid.
  • the retort oven shown in the figure has a housing 1, in which a loading door 2 is arranged for the introduction and execution of the products to be treated.
  • the retort oven is a suitable gas-tight formed retort 5, which is surrounded by a heating chamber 4, which is heated electrically or with a suitable gas burner.
  • a suitable batch payload 6 within the retort is a suitable batch payload 6, in which two batches 8 of products to be treated are shown schematically.
  • a hot gas fan 9 on the wall of the retort oven opposite the loading door 2 ensures a corresponding gas circulation within the retort 5, with corresponding gas guiding devices 7 within the retort providing uniform circulation. In this case, gas is sucked in from the interior of the charge-use space 6 by the fan 9 and pressed outside the gas-conducting devices 7 in the direction of the loading door 2.
  • the retort oven is arranged on a suitable frame 3. At the bottom of the furnace are suitable cooling air inlet nozzles 10 which communicate with a cooling air fan 13.
  • Corresponding gases are introduced via gas lances 11 in the batch payload space 6.
  • Gas lances which are located in the figure behind the gas lance 11 and thus are not shown, also serve to remove exhaust gases from the charge space.
  • exhaust gases are permanently removed from the retort in order to prevent condensation of the exhaust gases on the retort wall and thus a renewed contamination of the products.
  • the boiler room 4 With the boiler room 4 a uniform and permanent heating of the wall of the retort 5 is ensured to also prevent condensation processes on the retort wall.
  • the boiler room 4 has corresponding outlet nozzles 12 for the heating / cooling gas used.
  • the retort oven described above functions in the following manner. It is assumed in this embodiment that the oven is used for residual debindering and presintering. A pre-debinding of the products is already done in a separate plant, which is not shown here.
  • the pre-debinded products are introduced via the feed door 2 into the batch payload space 6 of the furnace by means of suitable charge carriers and arranged there.
  • a Restentbind réellesrea takes place, wherein the heating chamber 4 is heated, corresponding reaction gases introduced via the lance 11, exhaust gases discharged and the fan 9 is set to gas circulation in operation.
  • the residual debinding process is carried out in a temperature range of 200-600 ° C for a suitable period of time. Thereafter, the temperature is raised to a range of 450-900 ° C to perform a pre-sintering process. During these periods, a permanent exhaust of exhaust gases and a heating of the retort wall take place.
  • the retort After completion of the pre-sintering process, the retort is cooled by means of cooling air and the cooling air fan 13. When a certain cooling is achieved, the oven door 2 is opened and the presintered products are removed from the oven. They can then be introduced into a suitable sintering furnace and finally sintered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Tunnel Furnaces (AREA)
EP12005084A 2011-07-15 2012-07-10 Procédé et dispositif de dégagement et de frittage de produits fabriqués en poudre métallurgique Withdrawn EP2546009A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011107456A DE102011107456A1 (de) 2011-07-15 2011-07-15 Verfahren und Vorrichtung zum Entbindern und Sintern von pulvermetallurgisch hergestellten Produkten

Publications (1)

Publication Number Publication Date
EP2546009A2 true EP2546009A2 (fr) 2013-01-16

Family

ID=46514072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12005084A Withdrawn EP2546009A2 (fr) 2011-07-15 2012-07-10 Procédé et dispositif de dégagement et de frittage de produits fabriqués en poudre métallurgique

Country Status (2)

Country Link
EP (1) EP2546009A2 (fr)
DE (1) DE102011107456A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104482756A (zh) * 2014-12-11 2015-04-01 沈阳恒进真空科技有限公司 立式真空脱脂炉
EP2815822A3 (fr) * 2013-06-18 2015-11-11 Elino Industrie-Ofenbau GmbH Procédé et installation de dégagement et de frittage de pièces
CN114178529A (zh) * 2021-11-03 2022-03-15 浙江恒成硬质合金有限公司 一种硬质合金脱脂炉及脱脂方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007753A1 (de) 2008-06-24 2009-12-31 Elino Industrie-Ofenbau Carl Hanf Gmbh & Co. Kg Verfahren und Vorrichtung zum Entbindern und Sintern von pulvermetallurgisch hergestellten Produkten

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007753A1 (de) 2008-06-24 2009-12-31 Elino Industrie-Ofenbau Carl Hanf Gmbh & Co. Kg Verfahren und Vorrichtung zum Entbindern und Sintern von pulvermetallurgisch hergestellten Produkten

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2815822A3 (fr) * 2013-06-18 2015-11-11 Elino Industrie-Ofenbau GmbH Procédé et installation de dégagement et de frittage de pièces
CN104482756A (zh) * 2014-12-11 2015-04-01 沈阳恒进真空科技有限公司 立式真空脱脂炉
CN104482756B (zh) * 2014-12-11 2016-08-24 沈阳恒进真空科技有限公司 立式真空脱脂炉
CN114178529A (zh) * 2021-11-03 2022-03-15 浙江恒成硬质合金有限公司 一种硬质合金脱脂炉及脱脂方法

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Publication number Publication date
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