Publication Date:
2014-10-01
Description:
In this work, Si 3 N 4 powders containing ~88% by weight of α-phase were prepared by adopting a facile yet efficient combustion synthesis strategy under a nitrogen pressure of 6 MPa. A unique radial–spheroidal cluster morphology was strikingly observed in the as-fabricated Si 3 N 4 products. More significantly, a three-step growth mechanism was rationally proposed herein based on quenching experiments and thermo-kinetic calculations. As concluded, both the combustion temperature achieved and the sustaining time in high-temperature period played significant roles in obtaining silicon nitride powders with controlled high contents of α-phase Si 3 N 4 .
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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