Production of highly aligned porous alumina ceramics by extruding frozen alumina/camphene body

Moon, Young Wook; Shin, Kangwon; Koh, Young Hag; Choi, Wook; Kim, Hyoun Ee

doi:10.1016/j.jeurceramsoc.2011.04.033

Cited by 22 publications

(21 citation statements)

References 25 publications

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“…(d)] to the direction of co‐extrusion, respectively. This suggests that the aligned pores were created successfully as a replica of the camphene dendrites, which had been elongated extensively by co‐extrusion . However, the alumina wall showed a number of pores [Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, a longer heat‐treatment time caused a decrease in the compressive strength, which might be due to a slight deterioration of a highly aligned porous structure. It should be noted that porous alumina tubes with aligned pores can provide superior mechanical properties to conventional ones with random pores …”

Section: Resultsmentioning

confidence: 99%

“…We herein demonstrate the utility of ceramic/camphene‐based co‐extrusion, which was newly and particularly developed in this study, for the production of alumina tubes with highly aligned pores. In this technique, camphene is used not only as the binder for preparing an alumina paste for co‐extrusion but as a pore‐forming agent for creating aligned pores . An initial feed rod, comprised of a pure camphene core and a frozen alumina/camphene shell, was first co‐extruded through an orifice with a diameter of 5 mm [Fig.…”

Section: Introductionmentioning

confidence: 99%

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Novel Ceramic/Camphene‐Based Co‐Extrusion for Highly Aligned Porous Alumina Ceramic Tubes

et al. 2012

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We herein propose a novel way of producing highly aligned porous alumina tubes by co‐extruding an initial feed rod, which comprised of a pure camphene core and a frozen alumina/camphene shell. This new and simple technique produced alumina tubes (~4.4 ± 0.1 mm in outer diameter) having uniform alumina walls (~1.1 ± 0.12 mm in thickness) with highly aligned pores, which were created by removing the extensively elongated camphene dendrites in the extruded alumina/camphene shell. Furthermore, the heat treatment of the extruded bodies at 33°C, which is close to the freezing point of the alumina/camphene slurry, led to a considerable increase in the size of the aligned pores formed in the alumina walls, from ~<5 to ~54 μm with increasing heat‐treatment time from 0 to 6 h. The compressive strength also increased significantly from 21 ± 1.6 to 61 ± 11.6 MPa, which was attributed mainly to the achievement of well densified alumina walls.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel Ceramic/Camphene‐Based Co‐Extrusion for Highly Aligned Porous Alumina Ceramic Tubes

et al. 2012

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“…The green bodies, comprised of 3-dimensionally interconnected alumina/camphene frameworks, were then heat-treated in an oven at 43 1C for 12 h to induce continual growth of the camphene dendrites formed in the alumina/camphene filaments [24]. To enhance bonding between the alumina/camphene frameworks, a load of $ 2 kPa was applied during the heattreatment.…”

Section: D Extrusion Proceduresmentioning

confidence: 99%

“…As a model ceramic, alumina was used owing to its high mechanical properties and reasonable biocompatibility [23]. Fundamentally, the 3D-Ex technique can produce ceramic filaments consisting of highly elongated camphene dendrites surrounded by ceramic walls through the extrusion of a frozen ceramic/camphene body [24,25] (Fig. 1(A)).…”

Section: Introductionmentioning

confidence: 99%