Effect of texture microstructure on tribological properties of tailored Ti3AlC2 ceramic

Abstract

Tribological property of c-axis textured shell-like Ti 3 AlC 2 ceramic was investigated using reciprocating sliding balls (SUS304) under loads of 1, 5, and 9 N. It was found that the textured top surface (TTS), corresponding to the (000l) plane, shows the lowest mean coefficient of friction in comparison with those measured on the textured side surface (TSS), where the sliding directions are parallel (TSS-1) and perpendicular (TSS-2) to c axis, under the same load. Among all the tested orientations, the TSS-2 exhibited the lowest wear rate of 1.51×103 mm 3 /(N·m) under the load of 9 N.The worn mechanisms on the TTS and TSS-1 were delamination, grain fracture, and grain spalling-off. On the TSS-2, plowing effect against balls was the dominating mechanism. This work suggests the criteria to maximize the wear resistance in the load range of 1-9 N.

Processing and Mechanical Properties of Ti2AlC MAX Phase Reinforced AE44 Magnesium Composite

“…Such strong anisotropic mechanical and tribological properties were expected in MAX phases [9,[29][30][31]. For example, Xu et al reported that textured Ti 3 AlC 2 shows the lowest mean coefficient of friction in the surface corresponding to the (0001) plane [31]. Furthermore, our previous study on Ti 2 AlC-AZ91D reveals that extrusion methods could regulate the orientation of Ti 2 AlC in AZ91D magnesium composites.…”

“…Hence, we fabricated the composite containing 15 vol.% Ti 2 AlC with semisolid stir casting methods. For comparison, AE44 alloy were also produced; the relative technique details may be found in in our previous publications [31,34]. Briefly, as-cast billets with 60 and 300 mm in diameter and height, respectively, were fabricated through semisolid stir casting under the protection of a mixed SF 6 and CO 2 gas atmosphere.…”

“…For example, Ti 2 AlC exhibited a low wear rate (1.8 × 10 −6 mm/(N•m)) during dry sliding against a steel disk [30]. Such strong anisotropic mechanical and tribological properties were expected in MAX phases [9,[29][30][31]. For example, Xu et al reported that textured Ti 3 AlC 2 shows the lowest mean coefficient of friction in the surface corresponding to the (0001) plane [31].…”

Slip casting and pressureless sintering of Ti3AlC2

“…where W TAC and W TC are the mass percentage of Ti 3 AlC 2 and TiC, respectively. As shown in Table 2, ρ TAC and ρ TC are the density of Ti 3 AlC 2 (4.25 g/cm 3 ) and TiC (4.93 g/cm 3 ) [29], respectively. The ratio of the measured density to the theoretical density gives the relative density.…”

“…MAX phases, where M is a transition metal, A is a group A element, and X is either C or N, are a group of intriguing new materials [1]. Titanium aluminum carbide (Ti 3 AlC 2 ), as a member of MAX family, possesses a combination of properties of metals and ceramics [2,3], such as low density (4.25 g/cm 3 ) [4], high electrical conductivity (0.23-0.35 μΩ•m) [5,6], high thermal shock resistance [4,7], low hardness (3.5 GPa) [6], low frictional coefficient [8], good machinability [9], In contrast to the aforementioned methods, pressureless sintering is more attractive for its high shape-forming flexibility and low cost. Li et al [16] firstly reported the PLS of Ti 3 SiC 2 -based compacts from the mechanical alloyed Ti, Si, and C powders after die-pressing at 130-150 MPa and subsequent cold-isostatically pressing (CIP) at 200 MPa.…”