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Comparison of moving bed reactors for chemical vapor deposition coating of fine particles

Authors
Journal
Advanced Powder Technology
0921-8831
Publisher
Elsevier
Publication Date
Volume
10
Issue
1
Identifiers
DOI: 10.1016/s0921-8831(08)60457-4
Disciplines
  • Chemistry

Abstract

Abstract New co-current and counter-current types of moving-bed reactor were devised for the coating of Si 3N 4 ultra-fine particles in the form of agglomerates by chemical vapor deposition of AIN. An experimental parametric study has been undertaken on the effects of operational conditions on total quantity of deposited AIN inside the agglomerates. As a result, the increase in the quantity of deposit was yielded by increasing reaction temperature, inlet concentration of AlCl3 reaction gas and solids residence time, and by decreasing the agglomerate size. Comparison of counter-current and co-current arrangements of the moving bed reactor revealed that the outlet conversion of Si 3N 4 particles to their composite with AIN in the co-current type of reactor is slightly lower than that in the counter-current one according to the numerical simulation based on the experiments.

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