Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Synthesis and properties of hot-pressed Ti-Al-C-N materials

nr katalogowy: 52720

Among many covalent materials such as carbides or nitrides there is a group of ternary compounds referred in literature as H-phases, Hägg-phases, Novotny-phases or thermodynamically stable nanolaminates. These compounds have a Mn+1AXn stoichiometry, where M is an early transition metal, A is an element of A groups (mostly IIIA or IVA) and X is carbon and/or nitrogen. Heterodesmic structures of these phases are hexagonal, P63/mmc, and specifically layered. They consist of alternate near close-packed layers of M6X octahedrons with strong covalent bonds and layers of A atoms located at the centre of trigonal prisms. The M6X octahedra, similar to those forming respective binary carbides, are connected one to another by shared edges. Variability of chemical composition of the nanolaminates is usually labelled by the symbol describing their stoichiometry, e.g. Ti2AlN represents 211 type phase and Ti3AlC2 - 312 typ. Structurally, differences between the respective phases consist in the number of M layers separating the A layers: in the 211’s there are two whereas in the 321’s three M layers [1÷3]. The layered, heterodesmic structure of MAX phases led to an extraordinary set of properties. These materials combine properties of ceramics like high stiffness, moderately low coefficient of thermal expansion and excellent thermal and chemical resistance with low hardness, good compressive strength, high fracture toughness, ductile behavior, good electrical and thermal conductivity characteristic for metals. They can be used to produce ceramic armor based on functionally graded materials (FGM) or as a matrix in ceramic-based composites reinforced by covalent phases [4]. This work was focused on synthesis of three materials in Ti-Al-C-N system, namely Ti3AlC2, Ti2AlN, Ti3Al(C, N)2, by the Self-propagating High-temperature Synthesis (SHS), than obtained powders were hot-pressed and some of their properties were examined. PREPARATI[...]

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