The invention relates to a process for the continuous thermal removal of binder from a metallic and/or ceramic shaped body which has been produced by injection molding, extrusion or pressing using a thermoplastic composition and comprises at least one polyoxymethylene homopolymer or copolymer as binder in a binder removal oven, which comprises the steps (a) removal of binder from the shaped body in a binder removal oven at a temperature which is from 5 to 20Â° C. below, preferably from 10 to 15Â° C. below, the temperature of a second temperature stage over a period of from 4 to 12 hours in a first temperature stage in an oxygen-comprising atmosphere, (b) removal of binder from the shaped body at a temperature in the range >160 to 200Â° C. over a period of from 4 to 12 hours in an oxygen-comprising atmosphere in a second temperature stage and (c) removal of binder from the shaped body at a temperature in the range from 200 to 600Â° C. over a period of from 2 to 8 hours in a third temperature stage in an oxygen-comprising or neutral or reducing atmosphere, with the shaped bodies being transported through the binder removal oven during process steps (a) and (b).

Claims

8 · 1 independent · depth 2

8 granted claims

›1.independentA process for the continuous thermal removal of binder from a metallic and/or ceramic shaped body which has been produced by injection molding, extrus…+7

›2.↳ 1The process according to claim 1, wherein the shaped body is heated to the temperature of the first temperature stage at a heating rate of from 1 to 4…d2

›3.↳ 1The process according to claim 1, wherein process steps (a), (b) and (c) are carried out in the same binder removal oven and the shaped body is transp…d2

›4.↳ 1The process according to claim 1, wherein an oven having at least two successive treatment chambers is used as binder removal oven.d2

›5.↳ 1The process according to claim 1, wherein an oven having gas guide devices which effect the flow of the oxygen-comprising atmosphere onto the shaped b…d2

›6.↳ 1The process according to claim 1 for the removal of binder from ceramic shaped bodies.d2

›7.↳ 1The process according to claim 1 for the removal of binder from metallic shaped bodies.d2

›8.↳ 1A process for producing metallic and/or ceramic shaped bodies from a thermoplastic composition byn(d) shaping of the thermoplastic composition by inje…d2

Classifications

17 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B22F3/10
B22F3/12

Section C — Chemistry; metallurgy

C04B35/565
C04B35/563
C04B35/583
C04B35/56
C04B35/14
C04B35/634
C04B35/638
C04B35/584
C04B35/58
C04B35/478
C04B35/111
C04B35/581
C04B35/505
C04B35/486
C04B35/46

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George Wyszomierski

art unit 1733 · TC 1700

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Type	Document	Date
related publication	US 20120104665 A1	3 May 2012

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