Process for the production of composite components by powder injection molding, and composite powders suitable for this purpose
The invention relates to a process for the production of metallic and metal-ceramic composite components by powder injection molding of a system comprising a metal composite powder, a binder and optionally a ceramic component, where the metal composite powder used is mixed with a protecting liquid in an inert atmosphere before the mixing with the binder. The invention furthermore relates to molybdenum/copper and tungsten/copper composite powders which have a primary metal particle size of predominantly <2 μm, an oxygen content of <0.8% by weight and optionally a ceramic component, to the use of these composite powders for the production of composite components by powder injection molding, and to a process for the preparation of composite powders in which oxides of molybdenum or tungsten and of copper are mixed, dry-ground and reduced using hydrogen at a temperature of from 800 to 1050° C., and a ceramic component is optionally admixed with the resultant metal composite powder.
1. A process for forming a molybdenum/copper composite powder comprising a primary metal particle size of predominantly less than about 2 μm and an oxygen content of less than about 0.8% by weight, the process comprising:
(a) mixing oxides of molybdenum and of copper and forming a mixture, and
(b) dry-grinding and reducing the mixture with dry hydrogen at a temperature ranging from about 800 to about 1050° C. and forming the composite powder.
2. A process for forming a tungsten/copper composite powder, wherein it has a primary metal particle size of predominantly less than about 2 μm and an oxygen content of less than about 0.8% by weight, the process comprising:
(a) mixing oxides of tungsten and of copper and forming a mixture,
(b) dry-grinding and reducing the mixture with dry hydrogen at a temperature of from about 800 to about 1050° C. and forming the composite powder.