Combustion synthesis of aluminum nitride from dross

For effective use of aluminum dress and development of cost-effective refra ctory with high thermal conductivity, the combustion synthesis of aluminum nitride was experimentally studied, in which effect of metallic aluminum co ncentration of a raw material and nitrogen pressure on ignition was mainly examined by using a newly-designed equipment. Once one end of powder mixtur e of aluminum and alumina was ignited at nitrogen atmosphere, combustion wa ve of exothermic reaction (Al + 0.5N(2) = AIN) propagated to another end of the powder successfully. With decreasing the aluminum concentration and th e nitrogen pressure, the propagating rate decreased. In decreasing the conc entration and/or the pressure extremely, it was quite difficult to ignite i t. Relationship between nitrogen pressure and aluminum concentration for th e possible combustion synthesis of aluminum nitride was expressed in the di agram. This map appealed that aluminum dress can be a raw material of the c ombustion synthesis for producing aluminum nitride industrially by controll ing the conditions.