Macro-porous Ti2AlC MAX-phase ceramics by the foam replication method

Abstract

This paper describes the fabrication of porous Ti 2 AlC MAX-phase ceramics using the foam replication technique. The influence of heattreatment cycle and sintering time on phase composition, microstructure and type of defect is discussed. Compression testing indicates that strength is related to defects that are introduced during the foam replication stage, as observed by optical and electron microscopy. The manufacturing process is adapted by employing additional coating stages to produce electrically conductive macro-porous ceramics with a range of strengths (0.2-6.3 MPa) and macrostructures. Such materials are of interest for use as a high surface area electrode for harsh environments or microbial fuel cells.

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

“…Once the foam has been created, various shaping and consolidation techniques can be utilized to convert the wet foam into a green body. In one possible route, a “quick” setting approach such as gelcasting is used . This technology allows a versatile shaping technique suitable to many types of geometry.…”

“…This technique has been well studied and established using common materials such as Al 2 O 3 . The robust mechanism of this approach (see Section for more details) has also enabled the development of foams of “less common” materials, for instance; ZrB 2, MAX phases, SiC, Si 3 N 4, geopolymers, and HA …”

“…The new century ushered in development of colloidal processing approaches to develop complex microstructures, particularly cellular materials . Concepts such as freeze casting for ice templating and particle‐stabilized foams began to proliferate in addition to sacrificial templating . Many different types of near net shaping processes have now been applied to a wide variety of different ceramic materials …”

Phase stability, mechanical properties and lattice thermal conductivity of ceramic material (Nb1−Ti )4AlC3 solid solutions

“…In the past decades, ternary carbides and nitrides ceramics known as the M n+1 AX n (MAX) phases (where n =1, 2, 3 or higher, M is an early transition metal atom, A is a group , , or elements and X is either C and/or N) have attracted much attention as promising engineering materials, due to their unique properties such as good electrical and thermal conductivity, damage tolerance, high melting point and excellent thermal shock resistance [1][2][3][4][5][6][7][8][9][10][11][12]. According to the value of layer index n, M n+1 AX n phases are labeled as 211, 312 and 413 phases for n=1, 2, 3, respectively.…”

Porosity effect on microstructure, mechanical, and fluid dynamic properties of Ti2AlC by direct foaming and gel‐casting

“…So far, the majority of studies reported on these materials focus on dense components. Research on porous Ti 2 AlC and other MAX phases is rather limited . Porous MAX phases need systematic studies, because control of the porosity and pore size can be used to tailor their functional properties.…”