Synthesis and microstructure of layered-ternary Ti2AlN ceramic

Preparation, mechanical, and thermal properties of a promising thermal barrier material: Y4Al2O9

“…Figure 3 shows the fracture surfaces of YAM; wherein layered characteristics are obvious, which are similar to those observed on the fracture surfaces of Ti 3 SiC 2 [16] and other layered ternary carbides and nitrides [17][18][19][20]. The delamination of YAM grains results in the formation of nanolaminated layers on the fracture surfaces, such as the area labeled A, B, and C in Fig.…”

Microstructural evolution during high-temperature oxidation of spark plasma sintered Ti2AlN ceramics

“…As the temperature was increased to 1300 ºC, Ti 2 AlN became the dominant crystalline phase (96.6 wt%) with 2.7 wt% TiN and 0.7 wt% TiAl 3 . This XRD analysis suggests the following reactions are possible during SPS [9,10,12]:…”

“…Formation of Ti-Al intermetallics has also been found during synthesis of layered ternary ceramics such as Ti 2 AlC [21] and Ti 3 AlC 2 [22]. It is also possible that Ti 2 AlN forms by reactions between TiN and Ti-Al intermetallics [12].…”

“…Al melts at approximately 660 ºC (reaction 1) while reaction between Ti and Al forms Ti-Al intermetallics such as TiAl and TiAl 3 [9,10,12] at approximately 700-900 ºC. Formation of Ti-Al intermetallics has also been found during synthesis of layered ternary ceramics such as Ti 2 AlC [21] and Ti 3 AlC 2 [22].…”

“…International Centre for Diffraction Data (ICDD) used are Oberkochen, Germany) operated in secondary electron imaging (SEI) and backscattered electron imaging (BEI) modes, coupled with energy-dispersive spectroscopy (EDS) for chemical analysis (Oxford Instruments INCA, Oxford, UK, using an ultra-thin window (UTW) detector which is capable of detecting light elements with atomic numbers Z>4). Before FEGSEM, the samples were etched using HF+HNO 3 +H 2 O (1:1:1) [12] for less than 20s, and then observed in reflected light in an optical microscope (OM). The grain size was statistically measured for over 145 grains using Adobe Photoshop software.…”