Fabrication of graded porous ceramics using alumina–carbon powder mixtures

Maca, Karel; Dobšák, Petr; Boccaccını, Aldo R.

doi:10.1016/s0272-8842(01)00004-9

Cited by 57 publications

(35 citation statements)

References 17 publications

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“…These hard ceramics are used in bulk, beads, powders, or as coatings (De Aza, et al, 2002, Dorlot, et al, 1989, Oonishi, et al, 2002. Alumina powder is used to form porous structures by sintering packed a powder with proper binder such as silica (Maca, et al, 2001). …”

Section: Ceramicsmentioning

confidence: 99%

“…Other polymers such as polyetheretherketones (PEEK), polylactides and polycaprolactones are also fabricated by SLS (Bukharova, et al, 2010, Williams, et al, 2005. Alumina is an important target for SLS (Maca, et al, 2001). Recently, composites of these materials have been widely studied because they can combine the characteristic advantages of existing materials (Chua, et al, 2004, Eosoly, et al, 2010.…”

Section: Selective Laser Sinteringmentioning

confidence: 99%

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Rapid Prototyping in Biomedical Engineering

Iwami¹,

Umeda²

2011

Advanced Applications of Rapid Prototyping Technology in Modern Engineering

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Section: Ceramicsmentioning

confidence: 99%

Section: Selective Laser Sinteringmentioning

confidence: 99%

Rapid Prototyping in Biomedical Engineering

Iwami¹,

Umeda²

2011

Advanced Applications of Rapid Prototyping Technology in Modern Engineering

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“…6). It is known that carbon used as a porous alumina gives rise to a reaction during sintering as follows; 4) 2hC solid i þ fO 2,gas g $ 2fCO gas g ð 1Þ…”

Section: Discussionmentioning

confidence: 99%

“…Those are fabricated by processes such as hot pressing, 2,3) sintering, 4,5) extrusion 6,7) and slip-casting 8) etc. However, development of porous ceramics has been progressing in spite of the numerous necessities and interests.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Continuously Porous Alumina Body by Fibrous Monolithic and Sintering Process

et al. 2003

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A continuously porous alumina sintered body was successfully fabricated using by the fibrous monolithic process, in which carbon and flour were used as a pore forming agent. An equation was driven for anticipating the microstructural change during extrusion as a function of the extrusion ratio, and it was identified that the resultant microstructure obtained from using the fibrous monolithic process agreed well with the calculated size using the equation. The third passed and sintered alumina body includes continuous pores of about 42.5 mm in diameter at an intended direction, while the second one consists of 228 mm. Fine pores were also found to form along the alumina surfaces with 0.1-10 mm in diameter. There was no shape change during binder burning out and sintering processes.

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“…More versatile techniques for creating porous microstructures less dependent on the characteristics of ceramic powders have involved adding fugitive additives that can be thermally removed. Cold isostatic pressing of ceramic powders with carbon as an impurity particle has been used to obtain highly controlled porous structures [11]. A novel foaming technique used methyl cellulose to form ceramic cakes of hydroxyapatite that were sintered to form tractable and interconnected porosity [12].…”

Section: Introductionmentioning

confidence: 99%

Replamineform Inspired Bone Structures (RIBS) using multi-piece molds and advanced ceramic gelcasting technology

Gyger¹,

Kulkarni²,

Bruck³

et al. 2007

Materials Science and Engineering: C

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A new technology was developed for quickly, simply, and affordably creating Replamineform Inspired Bone Structures (RIBS) that combines multi-piece mold manufacturing for creating complex macroscale geometries with advanced ceramic gelcasting technology for controlling microporosity. A conventional gelcast alumina formulation was modified by adding 0-10 wt. % of fugitive carbon particles (graphitic and activated) to obtain porous microstructures during sintering. The carbon-filled gelcast alumina formulation was used to create replicas of bone structures by filling a multi-piece mold automatically generated from a 3-D image of a real bone. Both types of carbon produced total porosity levels of up to 35% that increased with carbon content in a manner that indicated residual porosity from the burned out carbon was not being consumed during sintering. However, activated carbon specimens exhibited linearly increasing percentage of closed porosity with increasing carbon content, while graphitic samples exhibited more interconnected porosity with pore channels in the range of 200 µm. The influence of porosity on mechanical properties was studied by compression tests. The tests indicated that 35% total porosity in bone replicas can decrease strength 88%, decrease stiffness 80%, and reduce total deformation 40% in comparison to bone replicas with 13% total porosity fabricated without carbon. The reduction in stiffness was consistent with a model developed from microscale finite element analysis of overlapping solid spheres that produce microstructures similar to those observed in these specimens. Furthermore, the increased porosity of the material permits axial cracks to grow and bifurcate more easily at substantially reduced deformation and load levels.

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Fabrication of graded porous ceramics using alumina–carbon powder mixtures

Cited by 57 publications

References 17 publications

Rapid Prototyping in Biomedical Engineering

Rapid Prototyping in Biomedical Engineering

Fabrication of Continuously Porous Alumina Body by Fibrous Monolithic and Sintering Process

Replamineform Inspired Bone Structures (RIBS) using multi-piece molds and advanced ceramic gelcasting technology

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