Patent ID: 9556072
Date: 2017-01-31
CPC Classifications: B22F,C04B

Claim:
1. 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, wherein the binder comprises at least 80% by weight of polyoxymethylene, 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 20° 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 200° 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 600° 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) wherein if the shaped body is the metal shaped body then the molding composition comprises metal powders wherein the metal powder is selected from the group consisting of Fe, Cu, Nb, Ti, Mn, V, Ni, Cr, Co, Mo, W and Si and the metal powder can be in the form of an alloy.