Formation of aluminum nitride-aluminum composites via magnesium nitride displacement reaction
Book
·
OSTI ID:77956
- Drexel Univ., Philadelphia, PA (United States). Dept. of Chemical Engineering and Materials Engineering
Two methods were investigated for synthesizing aluminum nitride in molten aluminum, namely (1) by a solid-liquid displacement reaction, i.e. 2Al(l) + Mg{sub 3}N{sub 2}(s) {r_arrow} 2AlN(s) + 3Mg(l), and (2) by gas injection and reaction to form magnesium nitride in situ, followed by the displacement reaction, i.e. Al-Mg(l) + N{sub 2} {r_arrow} Al-Mg(l) + Mg{sub 3}N{sub 2}(s) {r_arrow} AlN(s) + Al-Mg(l). In the former, aluminum nitride was formed in molten aluminum by mixing magnesium nitride (Mg{sub 3}N{sub 2}) powder with molten aluminum at 1,000 C. The reaction proceeded via a solid-liquid interfacial reaction. The size of aluminum nitride formed was directly related to the initial size of magnesium nitride particles. In another approach, aluminum nitride was formed via in situ generated magnesium nitride. In this synthesis route, nitrogen bearing gas was bubbled into magnesium-containing aluminum alloy, and up to 15 vol% of aluminum nitride with average particle size of 3{mu}m was formed at 1,100 C. The results given in this paper suggest that aluminum nitride/aluminum composites can be made via the molten metal chemical reaction route.
- OSTI ID:
- 77956
- Report Number(s):
- CONF-950201--; ISBN 0-87339-283-3
- Country of Publication:
- United States
- Language:
- English
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