Method for the production of near net-shaped metallic and/or ceramic parts
AssigneeForschungszentrum Julich GmbH
InventorsHeinz Nelles, Martin Bram, Hans Peter Buchkremer, Detlev Stöver
Life of this patent
Estimating the term…
Abstract
A porous near-net-shape metallic parts with an open porosity of at least 10% by volume is made by first forming an injectable mass of a metallic powder of stainless steel, Ti, NiTi, or a titanium alloy, at least one thermoplastic binder, and at least one place holder. The mass then injection molded into the shape of the part to be produced, cooled, set in a capillary-active material, and subjected to a first-stage binder removal to produce an open porosity. The place holder is then removed at least partially from the part with a fluid, and the part is subjected to a thermal binder-removing process. Finally the part is sintered.
Claims12
A method of making porous near-net-shape metallic parts with an open porosity of at least 10% by volume, the method comprising the steps of:
- a) forming an injectable mass of a metallic powder of stainless steel, Ti, NiTi, or a titanium alloy, at least one thermoplastic binder, and at least one place holder;
- b) injection molding the mass into the shape of the part to be produced;
- c) cooling the injection-molded mass and setting it in a capillary-active material and subjecting it to a first-stage binder removal to produce an open porosity;
- d) removing the place holder at least partially from the part with a fluid;
- e) subjecting the part to a thermal binder-removing process;
- f) subsequently sintering the part.
The method according to claim wherein between steps c) and d) there is a thermal binder-removing step.
Dependencies are inferred from the claim text.