High temperature strength and thermal stability for melt growth composite

Directional solidification and microstructural development of Al2O3/GdAlO3 eutectic ceramic in situ composite under rapid growth conditions

“…m 1/2 , which is almost two times of that of the Al 2 O 3 /Y 3 Al 5 O 12 eutectic ceramic [13,22,23]. The hollow noncooling turbine nozzle vane prepared from the Al 2 O 3 /GAP eutectic ceramic has been recently reported [15], and the thermal efficiency predicted can be improved 9% [24]. However, due to the very high melting point (>1700 • C) and processing difficulties, the preparation of Al 2 O 3 /GAP eutectic ceramic by conventional directional solidification method is very difficult and the cost is very high.…”

“…Furthermore, the solidification microstructure plays a key role in determining eutectic growth mechanism and consequent mechanical properties [27]. Most of previous studies on DS Al 2 O 3 /GAP eutectic rods are primarily used by the Bridgman method [13,22,24] or were focused on low growth rate [22][23][24][25][26]. Nevertheless, the temperature gradient of Bridgman method is very low (<100 K/cm), which leads to low growth rate and large interphase spacing (>10 m).…”

Study of the gas inclusions in Al2O3/Y3Al5O12 and Al2O3/Y3Al5O12/ZrO2 eutectic fibers grown by laser floating zone

“…The binary Al 2 O 3 -YAG (AY) and ternary Al 2 O 3 -YAG-ZrO 2 (AYZ) eutectic rods have been reported to show an excellent mechanical flexural strength [3,9,10]. They are expected to be a very interesting material in the field of aeronautics, aerospace and power generator technologies and their application to gas turbine systems has been investigated [11,12]. These eutectic composites have been researched and developed as bulk materials [13] as well as reinforcement fibers [9].…”

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

“…Furthermore, they also extended their study to ternary eutectics with the addition of a toughening phase (ZrO 2 ) Despite the significant interest in the performance of these materials at elevated temperature, the thermal microstructural stability of Al 2 O 3 -based DSEC has been scarcely investigated. Very eutectics [14][15][16][17][18] can be found in the literature and, to our knowledge, none related to any ternary DSEC.…”