Mechanism of AlN Formation through the Carbothermal Reduction of Al 2 O 3 in a Flowing N 2 Atmosphere
1993; Wiley; Volume: 76; Issue: 9 Linguagem: Inglês
10.1111/j.1151-2916.1993.tb07767.x
ISSN1551-2916
Autores Tópico(s)Catalytic Processes in Materials Science
ResumoMixtures of Al 2 O 3 , and C powders in a molar ratio of 1:3 were reduced in a N 2 atmosphere. The effects of time, temperature, particle size of both reactants, and N 2 flow rate were investigated. Kinetics show that the rate‐limiting process is the combustion of carbon, which leads to the reaction mechanism through the following basic steps: Al 2 O 3 = 2Al + 3/2 O 2 3C + 3/2 O 2 → 3CO (slow, with or without intermediate formation of CO 2 ) 2Al + N 2 = 2AlN (fast) All of the experimental results have been discussed on the basis of this model, which allows one to predict the best conditions for preparing AlN powders.
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