PROCESS EXTRACTION BY PLASMA OF JUNCTION IN OBTAINED PIECES BY MOLDING POWDERS BY INJECTION

摘要

Process extraction by plasma of junction in obtained pieces for molding of powders for injection is a thermalchemical process accomplished in a plasma reactor, that it uses the electric discharge in gaseous environment of low pressure, which contains hydrogen or other atomic or molecular gas capable to produce reactivates species, which increase significantly the kinetics of removal of the junction of injected pieces. In the case of use a mixture containing hydrogen as main gas, the reactivate species are constituted by atomic hydrogen and by hydrogen molecule in high potential energy state, besides the molecular ion of hydrogen. The pieces (1) to be processed are placed in the support (2) inside the oven (3), where the group is involved by the plasma (6). The gaseous mixture is admitted through (4), being the residues removed through the vacuum bomb (5). In the plasma (6) the reactivate species are formed as described above, which are responsible for the reduction of the necessary time to extract the junction, which is of the order of 10 times less than the necessary time in the main processes today existent. Besides the reduction of the energy consumption and of the present process to be practically non pollute, there are an accentuated increase of the productivity and consequent reduction of the costs of the produced pieces through the technology of powders injection.