Synthesis of high thermal conductivity nano-scale aluminum nitride by a new carbothermal reduction method from combustion precursor

摘要

AlN nano-scale powder was obtained through a new carbothermal reduction from combustion precursor at 1500℃ for 2 h in graphite furnace. The resultant product was a white solid powder, characterized by XRD, TEM, SAD and FIIR spectra. The results indicated that the product consisted of wurtzite AlN with an average size of about 80 nm. Through presureless and free-additive sintering at 1850℃ for 6 h, it showed that AlN nano-scale powders possess excellent sintering property, whose thermal conductivity was measured to be 120 W/mK. High thermal conductivity mechanism was proposed.