Plasma-chemical processes in the mixtures “metal-organic compound” and “metal-inorganic salt” initiated by pulse radiation of gyrotron

Abstract

Abstract Plasma-chemical processes in the mixtures of metal+organic compound and metal+inorganic salt under treatment by microwave pulses are described. The microwave pulses were generated by high-power gyrotron (frequency 75 GHz, power up to 550 kW, pulse duration from 0.1 to 15 ms). Al + melamine (1:1, 2:1 and 3:1 by molar) and Al + Al2O3 + NH4Cl (1:2:2 and 1:2:4 by molar) were treated in air with microwave pulses with power of 150-K350 kW and duration of 2^8 ms. It was found that the discharge can be easily initiated for both mixtures at minimal pulse duration of 2 ms. For Al + melamine mixture the energy threshold for the discharge depends linearly on the mass content of Al and does not exceed 1.0 kJ/g. For Al + Al2O3 + NH4Cl the threshold is also below 1.0 kJ/g. The products of treatment of Al + melamine contain mainly starting materials and no nitride phases, in case of Al + Al2O3 + NH4Cl some traces of Al11O15N were identified.