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Meeting Materials Science & Technology 2019
Symposium Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
Presentation Title Gas Atomization Processing of Calcium Powder with In situ Passivation
Author(s) Iver E. Anderson, Charles Czahor, Dustin Hickman, Trevor Riedemann
On-Site Speaker (Planned) Iver E. Anderson
Abstract Scope The availability of fine Ca metal powder is a principal barrier to the development of Al/Ca composite conductors by blending with fine Al powder, compaction, co-extrusion, and wire drawing. Unfortunately, calcium does not form a protective native oxide coating, permitting reaction with ambient humidity. Based on the previous example of magnesium passivation with sulfur hexafluoride (SF6), preliminary experiments indicated that the use of SF6 gas with Ca resulted in an undesirable layer of sulfur on the metal surface. An alternative volatile fluid called Novec™ 612 (with low global warming potential) was tested on melted/solidified Ca and resulted in a thin, F-containing layer. Calcium was gas-atomized with Ar+Novec™ mixed gas injected downstream into the spray chamber through a gas halo after droplet solidification has occurred. The powder was analyzed for topography, surface chemistry, and oxidation rate behavior to indicate successful passivation. Work funded by USDOE-OE through Ames Lab contract DE-AC02-07CH11358.


Advances in Titanium Research & Technology in Australia
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Development of Magnesium and Magnesium Alloy Materials through Press and Sinter Powder Processing
Development of Water-soluble Binders for Titanium Metal Injection Moulding (Ti-MIM) to Produce High Performance Components
Fabrication of La2O3 Dispersed Mo-Si-B Alloys and Its Mechanical Properties
Gas Atomization Processing of Calcium Powder with In situ Passivation
Improved Exothermic Reactivity of Surface-mediated Fine Aluminum Powders
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Mechanical Properties of HIP'd HSPT sintered Ti-6Al-4V
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Powder sintering involving TiH2: An Update Overview
Preparation of Mo2C by Reduction and Carbonization of MoO2 with Ethanol
Soft Magnetic Properties of Amorphous Metal Powders Fabricated by Gas-atomization Process
Strong and Ductile Novel Aluminium Metal Matrix Composites Reinforced with Ex-situ Carbon Nanotubes and In-situ Alumina Nanoparticles
The Influence of Atomisation route and Powder Characteristics on the Microstructural and Mechanical Properties Development of HIPped IN625 Ni-Superalloy
The Research on Improve the Mechanical Property by Selective Formation of Y-Ti-O Complex Oxide in Ni-based ODS Alloy
Thermodynamic Model for Predicting the Embodied Energy of Titanium Alloys Produced by Powder Metallurgy
Ultrasonic Consolidation of Nanocrystalline Powders

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