Structural and Morphological Evaluation of 25% vol. Ni/Al₂O₃ Nanocomposite Powders Produced by Mechanical Milling

Abstract

Abstract. The evolution of the Al 2 O 3 /Ni (25% vol. Ni) composite powders, during the milling and the stability of the composite phases were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray microanalysis (EDX). SEM images show a high level of homogenization of the Ni and Al 2 O 3 phases for milling times larger than 120 minutes. The X-ray study indicates no reaction between the two phases. The crystallite grain size decreases with the milling time for both phases.

Synthesis and characterisation of Al2O3/Ni-type composites obtained by spark plasma sintering

“…Al 2 O 3 /Ni composite compacts with different volume content of Ni were obtained by SPS starting from a mixture of Al 2 O 3 (tabular alumina, 99.99% purity, D50 = 30 µm) and Vale-Inco 123-carbonyl Ni powders (99.95% purity, D50 = 6 µm). The powders were mixed in a Turbula-type blender for 20 minutes and then milled in a Fritsch Pulverisette 4 planetary ball mill under argon atmosphere for up to 180 minutes [25,26].…”

“…The objective of the research presented here was to study the influence of the sintering temperature of ceramic/metal nanocomposite materials, focusing on the microstructure and properties of nanocomposites prepared by SPS from mechanically activated powders. were mixed in a Turbula-type blender for 20 minutes and then milled in a Fritsch Pulverisette 4 planetary ball mill under argon atmosphere for up to 180 minutes [25,26].…”