Predicting the Adiabatic Temperature of Transparent Y<SUB>3</SUB>Al<SUB>5</SUB>O<SUB>12</SUB> Prepared via Combustion Synthesis under Ultra-High Gravity

Abstract

In this paper, the adiabatic temperature of a transparent yttrium aluminum garnet (YAG) preparation using a NiO/Al/Y 2 O 3 aluminothermic system was calculated based on a thermodynamic theory. The results show that the adiabatic temperature without preheating reaches the 2891 K, which is higher than the melting points of YAG and Ni. The liquid phase mixture products can be separated and densified under ultra-high gravity (UHG). In the preheating temperature range of 620 K$2790 K to the reactants of this system, the adiabatic temperature is the same as 3156 K, the boiling point of Ni products. The theoretical analyses and experimental results prove the effectiveness of the YAG fabricated via combustion synthesis under an ultra-high gravity field.

Review of melt casting of dense ceramics and glasses by high gravity combustion synthesis

“…By high gravity combustion synthesis, a variety of ceramic and glass materials have been prepared, including single phase ceramics, 4,[22][23][24][25][26][27] composite ceramics, 2,3,28-43 glasses, 17,44,45 and glassceramics. 17,46 As examples, some ceramic and glass materials prepared by high gravity combustion synthesis are discussed as follows.…”

“…Y 3 Al 5 O 12 (YAG) ceramics were prepared by high gravity combustion synthesis from the reaction of 10Al+15NiO+3Y 2 O 3 = 2Y 3 Al 5 O 12 +15Ni 23 – 25. The density of the synthesised YAG samples increased with increasing high gravity factors, and translucent YAG ceramics with a relative density of ∼98% were produced with g ′/ g = 800 (Fig.…”