Preparation of Ti3SiC2

Phase reactions associated with the formation of Ti3SiC2 from TiC/Si powders

“…a layered, ternary carbide (or nitride) of general chemical formula M n À 1 AX n where M is an early transition metal, A is an element from groups 12-16 in the periodic table of the elements, X is either carbon or nitrogen and n is an integer 1-3. There is consensus in the literature, with some minor variations, on the route of formation of Ti 3 SiC 2 from powder mixtures including Ti metal, such as Ti/SiC/C [7,8], Ti/C/SiC [6,9,10], Ti/Si/C [11,12], Ti/Si/C [13][14][15], Ti/Si/TiC [16,17] or Ti/Si/TiC [18][19][20]. This reaction pathway includes the formation of Ti 5 Si 3 C x as a necessary intermediate phase for the formation of Ti 3 SiC 2 [9,10]. In TiC/Si powders, however, Ti 5 Si 3 C x has not been observed.…”

Synthesis and DFT investigation of new bismuth-containing MAX phases

“…Then, density functional theory (DFT) calculations can provide important insights into the material properties and phase stability of the candidate M n + 1 AX n phases that can be complementary to experimental studies1718192021. Notably, for some of the M n + 1 AX n phases there is little empirical information as experiments are hindered by the difficulty of producing single phase samples2223. Considering phase stability, previous DFT studies242526 have correctly predicted the stability (or not) of M n + 1 AX n phases with respect to their competing phases.…”

Microstructure evolution in Si+ion irradiated and annealed Ti3SiC2MAX phase

“…In recent years, a class of ternary layered hexagonal carbides and nitrides called MAX phases have attracted extensive research attention. 1,2 MAX phases have the general chemical formula of M n+1 AX n , where n = 1-3 and M is an early transition metal element (such as Ti, V, and Nb), A is an A-group element (such as Al and Si) and X is either C and/or N. [3][4][5][6] The unique crystal structure and electronic density of states make MAX phase materials exhibit both ceramic and metallic properties: low density, perfect heat conductivity, high strength, excellent corrosion resistance, and high-temperature oxidation resistance. 7 Fracture energy absorption mechanisms, such as crack deflection, interlaminar tearing, and inter-grain slippage, make the MAX phase have good plastic deformation behavior.…”