Plasma atomization: A new process for the production of fine, spherical powders

Abstract

A new atomization process, plasma atomization (P.A.), has been developed to produce fine, spherical powders. Unlike conventional high-pressure atomizers, P.A. utilizes multiple nontransferred direct-current arc plasmas to accelerate the atomization gas. In the P.A. process, metal wires are fed into the apex of the multiple plasmas, where they melt and are atomized in a single step. This process offers the unique ability to produce spherical powders of reactive metals with a typical average particle size of 40 pm.

Plasma-sprayed bovine hydroxyapatite coatings

“…In this study, it was seen that the bond-coating did not change the tensile strength as researched in a recent study (11.04 MPa for commercial HA (CHA) and 11.6 MPa for bond-coated CHA) [6]. Usually most plasma powders are produced with different methods like sol -gel, gas atomization and plasma atomization method [11]. Implant manufacturing companies generally use the HA plasma powder produced by Plasma Technic (GmbH 6021 or XPT-D-703), which uses the sol -gel method.…”

Synthesis of nanostructured spherical aluminum oxide powders by plasma engineering

“…It is anticipated that synthesis of nanostructured ceramic spheres by plasma spray technique would result in development of an ideal free-flowing powder feedstock to synthesize nanostructured coatings, and small complex parts with improved physical properties. Spheroidization by plasma spraying has been studied earlier, [7,8,9] but the novelty of this article lies in the idea of using different quenching media (viz. air, water, and liquid nitrogen) to achieve nanostructured grains in individual spherical powder particles through the plasma spraying process.…”

Plasma-sprayed human bone-derived hydroxyapatite coatings: effective and reliable

“…There is also an important aspect about the production routes of HA powder are produced with different methods such as gas atomisation (80 Am), the rapid spinning cup method (25 Am), the rotating-electrode process (150 Am), rapid solidification (40 Am) and the plasma atomisation methods (40 Am) [21]. Generally, these techniques are applicable for metallic powders.…”