High-thermal-conductivity aluminum nitride ceramics: the effect of thermodynamic, kinetic, and microstructural factors

摘要

Improvement in the thermal conductivity of aluminum nitride (AIN) can be realized by additives that have a high thermodynamic affinity toward alumina (Al_2O_3), as is clearly demonstrated in the aluminum nitride-Yttria (AIN- Y_2O_3) system. A wide variety of lanthanide dopants are Compared at equimolar lanthanide oxide:alumina (Ln_2O_3: Al_2O_3, where Ln is a lanthanide element) ration, with Samaria (Sm_2O_3) and lutetia (Lu-2O_3) being the dopants that Give the highest- and lowest-thermal-conductivity AIN com- Posites, respectively.