Effect of Microwave Radiation on the Thermal Properties of the Electroexplosive Copper Nanopowder

At this research, copper nanopowder was irradiated by microwaves radiation with frequency of 2.85 GHz and power density of 8 kW/cm
²
for 5 seconds. It was founded that the value of start oxidation temperature of powder was characterized by fluctuating values in the range 150-250°C with increase of exposure dose. In addition, the specific thermal effect of powder oxidation varied from 5870 to 7505 J/g with increase of irradiation absorbed dose. The degree of powder oxidation varied from 34.5 to 46.95%. The probable cause of these regularities is an increase the activity of iron powder and subsequent decrease of it under high power density microwaves.