Fabrication and characterization of pure porous Ti3SiC2 with controlled porosity and pore features

Zhou, Chilou; Ngai, Tung Wai Leo; Lu, Longsheng; Li, Y.Y.

doi:10.1016/j.matlet.2014.05.198

Cited by 33 publications

(15 citation statements)

References 11 publications

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“…As a result, Cr 2 AlC porous structures with low (35 vol%), intermediate (53 vol%), and high (75 vol%) well‐distributed porosity were successfully produced by the sacrificial template technique, using NH 4 HCO 3 as temporary material. This is the first time that Cr 2 AlC foams with controlled porosity are developed, but microstructure and results are in concordance with the reported values of other MAX phases . In these works, Ti 2 AlC porous structures were obtained by sacrificial template as well, leading to porosities between 10 and 80 vol% with pore sizes between 42 and 1000 μm.…”

Section: Resultssupporting

confidence: 87%

High‐temperature oxidation and compressive strength of Cr₂AlC MAX phase foams with controlled porosity

et al. 2017

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Cr 2 AlC foams have been processed for the first time containing low (35 vol.%), intermediate (53 vol.%) and high (75 vol.%) content of porosity and three ranges of pore size, 90 -180 µm, 180 -250 µm and 250 -400 µm. Sacrificial template technique was used as processing method, utilizing NH 4 HCO 3 as temporary pore former. Cr 2 AlC foams exhibited negligible oxidation up to 800 °C and excellent response up to 1300 °C due to the in-situ formation of an outer thin continuous protective layer of α-Al 2 O 3 . The insitu α-Al 2 O 3 protective layer covered seamlessly all the external surface of the pores, even when they present sharp angles and tight corners, reducing significantly the further oxidation of the foams. The compressive strength of the foams was 73 and 13 MPa for 53 vol.% and 75 vol.% porosity, respectively, which increased up to 128 and 24 MPa after their oxidation at 1200 °C for 1 hour. The increase in the compressive strength after the oxidation was caused by the switch from inter-to transgranular fracture mode. According to the excellent high temperature response, heat exchangers and catalyst supports are the potential application of these foams.

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Section: Resultssupporting

confidence: 87%

High‐temperature oxidation and compressive strength of Cr₂AlC MAX phase foams with controlled porosity

et al. 2017

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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In this study, Ti2AlC foams were fabricated by direct foaming and gel‐casting using agarose as gelling agent. Slurry viscosity, determined by the agarose content (at a fixed solids loading), as well as surfactant concentration and foaming time were the key parameters employed for controlling the foaming yield, and hence the foam porosity after sintering process. Fabricated foams having total porosity in the 62.5‐84.4 vol% range were systematically characterized to determine their pore size and morphology. The effect of the foam porosity on the room‐temperature compression strength and elastic modulus was also determined. Depending on the amount of porosity, the compression strength and Young's modulus were found to be in the range of 9‐91 MPa and 7‐52 GPa, respectively. Permeability to air flow at temperatures up to 700°C was investigated. Darcian (k1) and non‐Darcian (k2) permeability coefficients displayed values in the range 0.30‐93.44 × 10−11 m2 and 0.39‐345.54 × 10−7 m, respectively. The amount of porosity is therefore a very useful microstructural parameter for tuning the mechanical and fluid dynamic properties of Ti2AlC foams.

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“…This novel combination of both metallic and ceramic properties, its technical application towards chemical resistance, high temperature, machinability and load bearing ability are the main reasons to select Ti 2 AlC as an a candidate material for a porous electrically conductive electrode material. Research on the manufacture of macroporous Ti-Al-C MAX-phase ceramics is rather limited [18][19][20] and the majority of porous MAX-phase ceramic is produced by reactive sintering which generates porosity up to 65% throughout the sample body with a wide distribution of pore sizes [21][22][23]. One of the disadvantages of the reactive sintering approach is the difficulty in fine control of the pore size and pore distribution during the exothermic reactions of the elemental reactants used to form the product, thereby leading to material inhomogeneity.…”

Section: Introductionmentioning

confidence: 99%

“…Hu et al [18] and Zhou et al [20] reported the production of porous Ti 2 AlC and Ti 3 SiC 2 respectively, prepared using NaCl as the pore former for controlling the volume fraction of porosity and the pore size. Sun et al [19] reported the manufacture of a porous reticulated Ti 3 AlC 2 ceramic that was used as a substrate to deposit catalytic CeO 2 for a gas exhaust catalyst device.…”

Section: Introductionmentioning

confidence: 99%

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

Bowen

Thomas

2015

Ceramics International

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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.

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Fabrication and characterization of pure porous Ti3SiC2 with controlled porosity and pore features

Cited by 33 publications

References 11 publications

High‐temperature oxidation and compressive strength of Cr₂AlC MAX phase foams with controlled porosity

High‐temperature oxidation and compressive strength of Cr₂AlC MAX phase foams with controlled porosity

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

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

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Fabrication and characterization of pure porous Ti3SiC2 with controlled porosity and pore features

Cited by 33 publications

References 11 publications

High‐temperature oxidation and compressive strength of Cr2AlC MAX phase foams with controlled porosity

High‐temperature oxidation and compressive strength of Cr2AlC MAX phase foams with controlled porosity

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

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

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High‐temperature oxidation and compressive strength of Cr₂AlC MAX phase foams with controlled porosity

High‐temperature oxidation and compressive strength of Cr₂AlC MAX phase foams with controlled porosity

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