Dielectric and thermal properties of AlN ceramics

Carbothermal synthesis of spherical AlN granules: Effects of synthesis parameters and Y2O3 additive

“…Among them, Y 2 O 3 is one of the most commonly used additives since it can react with Al 2 O 3 to form liquid-phase yttrium aluminates to promote the densification of AlN ceramics [20]. Also, it purifies the AlN lattices by forming YAP and YAM with low activity of Al 2 O 3 in them, which favors for oxygen removal and thus improves the thermal conductivity of AlN ceramics [21][22][23]. Furthermore, the efficiency of Y 2 O 3 additive on the carbothermal synthesis of AlN powders has also been demonstrated by several researchers [24][25][26][27].…”

Thermal conductivity of Spark Plasma Sintered AlN ceramics with multiple components sintering additive

“…The other is to improve the thermal conductivity by decreasing the oxygen impurities in the AlN lattice. Among these sintering additives, Y 2 O 3 [5][6][7], Sm 2 O 3 [8,9] and CaF 2 [10,11] have been demonstrated to be effective sintering additives for AlN ceramics. But high sintering temperature (>1800 • C) and long sintering time (4-6 h) during conventional sintering process are still necessary to fabricate dense AlN ceramics sintered with one component sintering additive.…”

Properties and microstructure of AlN prepared using alumina crucible and MoSi2 heating element

“…The Vicker's hardness of specimen YC31 increased from 1079 kg mm −2 to 1178 kg mm −2 for sintering temperatures of 1650 • C and 1700 • C, respectively. Table 4 summarizes the thermal, dielectric, and hardness properties of sintered AlN obtained in this study compared to those obtained in previous reports [13,19,[21][22][23][24][25]. An AlN product with a slightly high dielectric constant, an intermediate thermal conductivity, and a suitable value of hardness can be obtained by employing the proposed sintering procedure.…”