Processing and characterization of porous Ti2AlC with controlled porosity and pore size

Current-Activated, Pressure-Assisted Infiltration: A Novel, Versatile Route for Producing Interpenetrating Ceramic–Metal Composites

“…[31] Previous investigations have shown exceptional damage tolerance of MAX phase foams. [25] Specifically, the compressive strength of Ti 2 AlC decreases almost linearly with increasing porosity and less rapidly when compared with common ceramics, such as Al 2 O 3 , Si 3 N 4 , and ZrO 2 , whose compressive strength drops dramatically with increasing porosity. [32] In addition to relatively high strength of Ti 2 AlC foams, another advantage of using them as preforms is the easy control of pore size and porosity which allows producing interpenetrating ceramic-metal composites with customized structures.…”

“…Sweden) with the particle size in the 45-90 μm range, and NaCl powders (Sigma-Aldrich, St. Louis, MO, USA) with the particle size in the 355-500 μm range were used to process porous preforms following procedures described elsewhere in more detail. [25] The preparation of the Ti 2 AlC foams involves three steps: (i) cold pressing a NaCl-Ti 2 AlC powder mixture in 40/60 volume ratio; (ii) dissolving the NaCl in distilled water, and (iii) pressureless sintering of the porous green body under flowing argon at 1400…”

MAX phase Ti2AlC foams using a leachable space-holder material

“…The fraction of the different phases present was determined by normalizing the intensity of the highest XRD peaks for each phase and is shown in Table 2. Similar phase constitution for the starting Ti 2 AlC powder, provided by this supplier, has been reported before [18]. It has also been reported that during sintering the amount of The amount of retained sugar in the foams was also studied by chemical analysis of carbon content ( Table 3).…”

“…This method has been studied and good results have been reported for many alloys [25]. NaCl has been employed to make Ti 2 AlC foams, however pore shape became elliptical and oriented, rather than the cubic-like shape of NaCl particles, as a consequence of deformation of the particles during cold press loading [18]. Foams have also been produced employing crystalline carbohydrate as a space-holder and soaking in water under controlled conditions before sintering [26][27][28][29][30][31][32][33], however, MAX phase foams have not been previously produced using this method.…”

“…However, only a few recent studies have focused on porous Ti 2 AlC [11][12][13][14][15][16][17][18][19], including some studies on MAX phases/Mg composites fabricated by melt infiltration of porous MAX phase performs [20][21][22], with exceptional mechanical damping capabilities. In these studies the methods used have been: incomplete densification during sintering or reactive sintering [11-17, 20, 21], replica method using polyurethane foams [23], and the use of NaCl as space-holder [18][19]. Space-holder method produces open and closed porosity by addition of space holder or pore former.…”