Nanocrystalline β-sialon by reactive sintering of a SiO2-AlN mixture subjected to high-energy ball milling

Sialons are ceramic materials based on the elements silicon, aluminum, nitrogen and oxygen derived from silicon nitride in which silicon and nitrogen are simultaneously replaced by aluminum and oxygen atoms, respectively. Such materials possess excellent resistance to thermal shock and corosion by m...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-04, Vol.391 (1-2), p.225-227
Main Authors: TESSIER, P, ALAMDARI, H. D, DUBUC, R, BOILY, S
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
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Summary:Sialons are ceramic materials based on the elements silicon, aluminum, nitrogen and oxygen derived from silicon nitride in which silicon and nitrogen are simultaneously replaced by aluminum and oxygen atoms, respectively. Such materials possess excellent resistance to thermal shock and corosion by molten metals and are used for high temperature applications such as thermocouple protection sheaths in aluminum metallurgy. They are candidates for hot-zone parts in internal combustion engines. A mixture of powders of silica and aluminum nitride is subjected to high-energy ball milling for different milling times. This material is subsequently compacted by uniaxial pressing and sintered at 1450DGC. The resulting pellets are crushed and analysed by X-ray diffraction. For short milling times, the amount of phase transformation is minimal and the resulting material mostly consists of cristobalite and aluminum nitride. For long milling times, nanocrystalline beta-SiAl2O2N2 is mainly produced.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2004.08.074