Macroporous silicon carbide foams for porous burner applications and catalyst supports

Vogt, Ulrich; Györfy, L.; Herzog, Andreas; Graule, Thomas; Plesch, G.

doi:10.1016/j.jpcs.2006.12.008

Cited by 94 publications

(44 citation statements)

References 11 publications

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“…• C showed an increase in the compressive strength from 0.3 MPa after two coating cycles to 1 MPa after four coating cycles [62]. However, increasing the sintering temperature to 1800…”

Section: Mechanical Propertiesmentioning

confidence: 95%

“…Thus, components produced by this route are usually reported to possess low mechanical strength. The optimum concentration [56] and repeated coating [61,62] of polymeric precursor slurry significantly affect the strength of the resultant porous SiC ceramics. Vogt et al prepared macroporous nitrogen-based silicon carbide (NBSiC) ceramics by dipping the PU foams several times into the polysiloxane (MK polymer) precursor slurry [62].…”

Section: Replicamentioning

confidence: 99%

“…Nagrejo and Edirishingwe reported that immersion of suitable concentration of polysilanes in PU foams yielded highly porous (85-96%) SiC, SiC-Si 3 N 4 and SiC-TiC foams with a compressive strength ranging from 1.1 to 1.6 MPa [56]. Appropriate combination of repeated re-infiltration and pre-sintering steps has been suggested to increase the strut thickness and to fill up the hollow struts thereby strengthening the cell structure [61,62]. The porous SiC structure derived from coating of polysiloxane on PU foams under nitridation at 1400…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…• C caused re-crystallization of amorphous SiC and reduction of strength [62]. Flexural strength of SiC powder-derived porous SiC ceramics synthesized with PU replica was reported to be lower than 2 MPa [134], but no information is available on flexural strength of polysiloxane-derived porous ceramics produced by the replica method.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Processing of polysiloxane-derived porous ceramics: a review

Kumar

Kim

2010

Science and Technology of Advanced Materials

112

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Because of the unique combination of their attractive properties, porous ceramics are considered as candidate materials for several engineering applications. The production of porous ceramics from polysiloxane precursors offers advantages in terms of simple processing methodology, low processing cost, and easy control over porosity and other properties of the resultant ceramics. Therefore, considerable research has been conducted to produce various Si(O)C-based ceramics from polysiloxane precursors by employing different processing strategies. The complete potential of these materials can only be achieved when properties are tailored for a specific application, whereas the control over these properties is highly dependent on the processing route. This review deals with processing strategies of polysiloxane-derived porous ceramics. The essential features of processing strategies-replica, sacrificial template, direct foaming and reaction techniques-are explained and the available literature reports are thoroughly reviewed with particular regard to the critical issues that affect pore characteristics. A short note on the cross-linking methods of polysiloxanes is also provided. The potential of each processing strategy on porosity and strength of the resultant SiC or SiOC ceramics is outlined.

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“…• C showed an increase in the compressive strength from 0.3 MPa after two coating cycles to 1 MPa after four coating cycles [62]. However, increasing the sintering temperature to 1800…”

Section: Mechanical Propertiesmentioning

confidence: 95%

Section: Replicamentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Processing of polysiloxane-derived porous ceramics: a review

Kumar

Kim

2010

Science and Technology of Advanced Materials

112

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“…Novel developments are dedicated to the manufacturing of high-transparent glass foams for optical applications such as biological cell support or support for photocatalysts [6,7]. Th e most relevant processing routes for the fabrication of porous ceramics are (i) replica techniques [8][9][10], (ii) direct-foaming techniques [11][12][13][14][15][16] and (iii) sacrifi cial template methods [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Polymer derived ceramic foams with additional strut porosity

Reschke¹,

Laskowsky²,

Kappa³

et al. 2011

Epitoanyag-JSBCM

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Ceramic foams with additional strut porosity were prepared by a self-foaming process of a polysilsesquioxane. The strut porosity was generated by adding sacrificial pore formers comprising of polymethylmethacrylate or of polyethylene to the self-foaming silicone. The polymer-inherent shrinkage was reduced by adding SiC particulate fillers to the silicone/pore-former mixture. Foaming was carried out on a preheated furnace at 270 °C, and subsequent pyrolysis was performed in argon atmosphere in the temperature range from 800 °C to 1200 °C in order to trigger the polymer-to-ceramic transformation of the polysilsesquioxane. The materials were characterized with respect to the pore size and the total porosity, the microstructure and the mechanical strength. The volumetric mean pore diameter of the strut ranged from 25 μm to 100 μm and the porosity was found to be 40% to 94%. The maximum compression strength exceeded 16 MPa.

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Polymer Processing of Ceramics

Ionescu¹,

Riedel²

2012

Ceramics and Composites Processing Methods

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Macroporous silicon carbide foams for porous burner applications and catalyst supports

Cited by 94 publications

References 11 publications

Processing of polysiloxane-derived porous ceramics: a review

Processing of polysiloxane-derived porous ceramics: a review

Polymer derived ceramic foams with additional strut porosity

Polymer Processing of Ceramics

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