Formation, stability, and presence of magnesium nitride in magnesium recycling processes
-
Christoph Bauer
,
Aberra Mogessie
Abstract
In this study an attempt has been made to identify analytical methods for detecting magnesium nitride, and document in which part of the magnesium recycling process this phase is concentrated. The samples were taken from a continuous fluxfree recycling session, where an AZ91D magnesium alloy was remelted and purified by blowing nitrogen through the melt. Exothermic reactions took place when magnesium nitride reacted to ammonia and Brucite and also when aluminium nitride reacted to ammonia and Gibbsite in a moisture-bearing environment. Because of this, it was essential to avoid any contact with moisture during the whole sampling and preparation process. The samples were exclusively handled in an argon atmosphere. Due to their crystallinity and Raman activity the nitrides were detected with X-ray diffraction and Raman spectroscopy, respectively. With the scanning electron microscope it was difficult to analyze small concentrations of nitrides since large, stable crystals were absent and the carbon coating absorbs the nitrogen Kα line.
The Mg-alloy was found to be free of impurities. Although nitrides were expected to be concentrated in the slag because of their greater density, they were found adhering at the nitrogen bubbles and accumulating in the dross. Large amounts of oxides were concentrated in the slag.
We would like to acknowledge K. Ettinger and F. Walter for their support during the SEM- and XRD work. R. Kaindl helped us with Raman analysis (Institute of Earth Sciences, Department of Mineralogy and Petrology, Karl-Franzens-University of Graz). The support of the LKR staff, especially A. Hölzl, and the financial support by LKR are also gratefully acknowledged.
References
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© 2006 Carl Hanser Verlag, München
Articles in the same Issue
- Contents
- Phase separation in Si–(B)–C–N polymer-derived ceramics
- Solidification curves for commercial Mg alloys obtained from heat-transfer modeled DTA experiments
- Thermodynamic assessment of the Mg–Nd system
- Solid-state reaction in Ni/Si multilayered films, characterized by magneto-optical and optical spectroscopies
- Phase diagram of the Co–Cu–Ti system at 850 °C
- Effects of an electric field applied during the solution heat treatment of the Al–Mg –Si–Cu alloy AA6111 on the subsequent natural aging kinetics and tensile properties
- Fabrication and electrical sliding wear of graphitic Cu–Cr–Zr matrix composites
- Further results on creep behaviour of sand-cast Mg–2.8Nd–0.8Zn–0.5Zr–0.3Gd alloy at 0.56 to 0.61Tm under stresses 40 to 90 MPa
- On the creep resistance in cast Ni-base superalloys
- Formation, stability, and presence of magnesium nitride in magnesium recycling processes
- From waste to high strength alloy – recycling of magnesium chips
- Sigma phase formation and its effect on mechanical properties in the corrosion-resistant superalloy K44
- Personal/Personelles
- Press / Presse
- Contents
- Articles Basic
- Phase separation in Si–(B)–C–N polymer-derived ceramics
- Solidification curves for commercial Mg alloys obtained from heat-transfer modeled DTA experiments
- Thermodynamic assessment of the Mg–Nd system
- Solid-state reaction in Ni/Si multilayered films, characterized by magneto-optical and optical spectroscopies
- Phase diagram of the Co–Cu–Ti system at 850 °C
- Effects of an electric field applied during the solution heat treatment of the Al–Mg –Si–Cu alloy AA6111 on the subsequent natural aging kinetics and tensile properties
- Articles Applied
- Fabrication and electrical sliding wear of graphitic Cu–Cr–Zr matrix composites
- Further results on creep behaviour of sand-cast Mg–2.8Nd–0.8Zn–0.5Zr–0.3Gd alloy at 0.56 to 0.61Tm under stresses 40 to 90 MPa
- On the creep resistance in cast Ni-base superalloys
- Formation, stability, and presence of magnesium nitride in magnesium recycling processes
- From waste to high strength alloy – recycling of magnesium chips
- Sigma phase formation and its effect on mechanical properties in the corrosion-resistant superalloy K44
- Notifications/Mitteilungen
- Personal/Personelles
- Press / Presse
Articles in the same Issue
- Contents
- Phase separation in Si–(B)–C–N polymer-derived ceramics
- Solidification curves for commercial Mg alloys obtained from heat-transfer modeled DTA experiments
- Thermodynamic assessment of the Mg–Nd system
- Solid-state reaction in Ni/Si multilayered films, characterized by magneto-optical and optical spectroscopies
- Phase diagram of the Co–Cu–Ti system at 850 °C
- Effects of an electric field applied during the solution heat treatment of the Al–Mg –Si–Cu alloy AA6111 on the subsequent natural aging kinetics and tensile properties
- Fabrication and electrical sliding wear of graphitic Cu–Cr–Zr matrix composites
- Further results on creep behaviour of sand-cast Mg–2.8Nd–0.8Zn–0.5Zr–0.3Gd alloy at 0.56 to 0.61Tm under stresses 40 to 90 MPa
- On the creep resistance in cast Ni-base superalloys
- Formation, stability, and presence of magnesium nitride in magnesium recycling processes
- From waste to high strength alloy – recycling of magnesium chips
- Sigma phase formation and its effect on mechanical properties in the corrosion-resistant superalloy K44
- Personal/Personelles
- Press / Presse
- Contents
- Articles Basic
- Phase separation in Si–(B)–C–N polymer-derived ceramics
- Solidification curves for commercial Mg alloys obtained from heat-transfer modeled DTA experiments
- Thermodynamic assessment of the Mg–Nd system
- Solid-state reaction in Ni/Si multilayered films, characterized by magneto-optical and optical spectroscopies
- Phase diagram of the Co–Cu–Ti system at 850 °C
- Effects of an electric field applied during the solution heat treatment of the Al–Mg –Si–Cu alloy AA6111 on the subsequent natural aging kinetics and tensile properties
- Articles Applied
- Fabrication and electrical sliding wear of graphitic Cu–Cr–Zr matrix composites
- Further results on creep behaviour of sand-cast Mg–2.8Nd–0.8Zn–0.5Zr–0.3Gd alloy at 0.56 to 0.61Tm under stresses 40 to 90 MPa
- On the creep resistance in cast Ni-base superalloys
- Formation, stability, and presence of magnesium nitride in magnesium recycling processes
- From waste to high strength alloy – recycling of magnesium chips
- Sigma phase formation and its effect on mechanical properties in the corrosion-resistant superalloy K44
- Notifications/Mitteilungen
- Personal/Personelles
- Press / Presse
