Nitrides Formation at nAl Combustion in Air

The efforts to burn nAl (apparent density 0.2gcm ) in a quartz tube showed that air supply to the combustion wave through the layer of nAl at pressure 

1 MPa is nearly absent, which is true also for the pMe powders [81]. Thus, gaseous reactant supply to the combustion wave at low pressures and, consequently, the temperature of the process are determined by the porosity of the CCP. 

The oxidation of A1 powders with rare-earth metals added to embrittle the oxide shell on A1 particles was studied in [28-30]. The introduction of such additives reduces the agglomeration of particles during combustion, and increases combustion efficiency and flame temperature. The use of nMe additives to nAl is one of the factors affecting the yield of nitride phase in the CCP. The highest yield of AlN (up to 66 mass%) in CCP at nAl combustion in air was observed for the additives nFe, nMo, and nW. 

Many phases, known for system Al-B-N-O , except aluminum borides, are present in the CCP. All boron is probably burned in the gas phase for mixture 

Initial sample composition Combustion stages CCP composition by XRD 

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