Processing and Properties of a Ni-ZrO2 P/M Composite

The powder metallurgy processing route is used for preparing Ni-matrix MMC by incorporating ultrafine Zr0 2 powder that is agglomerated into micron sized clusters.After blending with ball milling, the heated porous MMC is consolidated using the compression of a cam plastometer.Characterization of the MMC using SEM and EDAX reveals that most of the Zr0 2 clusters existing in the Zr0 2 feed powder can be nearly completely broken up by the ball milling process during blending.However, residual Zr0 2 clusters in a loose structure are preserved in the final sintered Ni-Zr0 2 material.After compression using a Cam plastometer, the clusters are not broken up but are flattened into discs but not densified or penetrated with Ni.A de-agglomeration process was attempted as an alternative blending process in order to achieve a better distribution of Zr0 2 .The results showed a modest improvement in the breakup of the clusters.Despite the presence of these clusters, it is shown that the dispersed Zr0 2 powders do increase activation energy for the flow stress of the MMC.

Abstract licence: CC BY-NC-ND

12 more references, whose wording the paper’s licence keeps private.

A person counts once a day per paper. We keep no cookie and no address: a reader is a hash that changes every day. Any month under five reads shows no number.