| 摘要 |
There is provided a method for the manufacture of a multilevel metal part, the method comprising the steps of: a) compacting agglomerated spherical metal powder to a green multilevel preform such that an open porosity exists, wherein the green multilevel preform fulfils the relation zg=zHVC·a, b) debinding the green preform, c) sintering the green preform in an atmosphere comprising hydrogen d) compacting the green preform with high velocity compaction to a density of at least 95% TD, e) subjecting the part to densification to a density of at least 99 % TD. There is further provided a multilevel metal part. Advantages of the method include that it is possible to manufacture a multilevel part which is essentially uniform throughout the entire part and which has excellent tolerance, which at the same time has virtually full density and thereby having excellent mechanical properties as well as excellent corrosion properties. |
| 主权项 |
1. A method for the manufacture of a multilevel metal part, said method comprising the steps:
a. compacting agglomerated spherical metal powder to a green multilevel preform with a density such that an open porosity exists, the agglomerated spherical metal powder comprising a binder, wherein the green multilevel preform has at least two different heights in z-direction in a three dimensional Cartesian coordinate system, wherein the ratio between the highest height zh and the lowest height zl (zh/zl) is at least 1.1, wherein the green multilevel preform fulfils the relation
zg=zHVA·a, for all points in the xy-plane, wherein zg is the variable height in z-direction of the green multilevel preform, wherein zHVC is the variable height in z-direction of the part after high velocity compaction in step (d), and
wherein a is a constant related to the compaction ratio. b. debinding the green preform, c. sintering the green preform in an atmosphere comprising hydrogen with a dewpoint not exceeding −40° C., d. compacting the sintered preform uniaxially along the z-axis with high velocity compaction to a density of at least 95% TD using a punch with a fixed shape, and e. subjecting the part to densification to a density of at least 99% TD. |
