Method of making a powder metal compact

摘要

A method of making a selectively corrodible article is disclosed. The method includes forming a powder comprising a plurality of metallic powder particles, each metallic powder particle comprising a nanoscale metallic coating layer disposed on a particle core. The method also includes forming a powder compact of the powder particles, wherein the powder particles are substantially elongated in a predetermined direction to form substantially elongated powder particles. In one embodiment, forming the powder compact includes compacting the powder particles into a billet, and forming the billet to provide the powder compact of the powder particles, wherein the powder particles are substantially elongated in a predetermined direction to form substantially elongated powder particles.

主权项

1. A method of making a selectively corrodible article, comprising:
forming a powder comprising a plurality of metallic powder particles, each metallic powder particle comprising a nanoscale metallic coating layer disposed on a particle core, the metallic coating layer having a substantially uniform thickness of 25 to 2500 nm; and forming a powder compact of the powder particles by deforming the powder particles such that they are substantially elongated in a predetermined direction to form substantially elongated powder particles and the coating layers form a substantially elongated cellular nanomatrix, the powder compact comprising an article that is selectively corrodible in response to a change in a predetermined wellbore fluid, the powder compact having an ultimate compressive strength or corrosion rate in the predetermined wellbore fluid that is greater than a powder compact of the metallic particles that comprises a cellular nanomatrix that is not substantially elongated.