Fabrication of Stainless Steel/Alumina Composite Powders by Spray Granulation and Plasma Spheroidization
Elodie Cabrol, Sandrine Cottrino, Hocine Si-Mohand, Gilbert Fantozzi
TL;DR
This paper introduces a new method to create stainless steel and alumina composite powders using spray granulation and plasma spheroidization for high-performance materials.
Contribution
A hybrid process combining spray granulation, RF plasma spheroidization, and SPS for fabricating 316L/Al2O3 composites with controlled microstructure.
Findings
Optimized RF plasma spheroidization parameters produce spherical and dense particles.
SPS densification results in composites with excellent density and hardness.
Fine particle segregation highlights the need for precise processing control.
Abstract
This work presents a new approach for the fabrication of 316L/Al2O3 composites, based on a combination of spray granulation, radio frequency (RF) plasma spheroidization and spark plasma sintering (SPS). Initially, a suspension containing 316L and alumina powders is formulated by precisely adjusting the pH and selecting an appropriate dispersant, thereby ensuring homogeneous dispersion of the constituents. The spray granulation process then produces granules with controlled size and morphology. RF plasma spheroidization, carried out using a TekSphero-40 system, is investigated by varying parameters such as the power, gas flow rates, injection position and feed rate, in order to optimize the formation of spherical and dense particles. The analysis reveals a marked sensitivity to heat transfer from the plasma to the particles, with a tendency for fine particles to segregate, which…
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Taxonomy
TopicsAdditive Manufacturing and 3D Printing Technologies · Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties