Mg alloy infiltrated Si–O–C ceramic foams

Zeschky, Jürgen; Lo, Jason; Höfner, Thomas; Greil, Peter

doi:10.1016/j.msea.2005.04.052

Cited by 27 publications

(18 citation statements)

References 26 publications

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“…3 X-ray diffractograms of the as-thermolysed and heat-treated SiOC samples. self-blowing of poly(phenylmethylsilsesquioxane) at 300 ℃ due to release of water and ethanol was reported in the literatures by Gambaryan-Roisman et al [25] and Zeschky et al [26][27][28]. This method of producing SiOC foams is promising, since the removal of sacrificial phase during pyrolysis is not required.…”

Section: Ceramic Foamsmentioning

confidence: 97%

Processing and characterization of polymer precursor derived silicon oxycarbide ceramic foams and compacts

2013

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This work focused on the fabrication of silicon oxycarbide ceramic (SiOC) foams as well as dense compacts using poly(hydridomethylsiloxane) (PHMS) as a polymer precursor. The room-temperature cross-linking of PHMS was achieved by the addition of 1,4-diazabicyclo [2.2.2] octane (DABCO) with the release of hydrogen gas as a by-product. This resulted in self-blowing of the polymer precursor at room temperature and thereby offered the possibility of producing SiOC foams without the need of any external blowing agents. We also reported the fabrication of crack-free silicon oxycarbide compacts by cold compaction and pyrolysis route using polyvinyl alcohol (PVA) as a processing additive. Cylindrical-shaped pellets were pyrolysed at 1300 ℃ in argon atmosphere with a ceramic yield of approximately 85%. Increased resistance to phase separation and crystallization up to 1400 ℃ was attributed to the presence of large volume fraction of free carbon in the material which was confirmed by Raman spectroscopy.

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Section: Ceramic Foamsmentioning

confidence: 97%

Processing and characterization of polymer precursor derived silicon oxycarbide ceramic foams and compacts

2013

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“…Thus, in the interpenetrating metal/ceramic phase composites, the metal phase stabilies of the ceramic struts and partially prevents strut bending. This results in a major improvement of the mechanical properties [1]. However, the IPC, made at preheating temperatures of 500 and 600 °C, showed inferior values modulus of the rupture.…”

Section: Interpenetrating Phase Compositementioning

confidence: 99%

“…Interpenetrating phase composites (IPCs) usually display superior mechanical properties when compared to conventional MMCs reinforced with particles, intermetallic phases, ceramics, and carbon fibres. A unique combination of cellular ceramic materials, with high mechanical strength and stiffness at low fractional densities, and the ductility of the metallic phase may be considered as a major advantage of metal/ceramic IPCs [1]. They can be produced using various ways [2] and [3].…”

Section: Introductionmentioning

confidence: 99%

“…They can be produced using various ways [2] and [3]. The infiltration can be achieved by a spontaneous capillary-driven metal infiltration [4], gas pressure-assisted infiltration [5] and [6], or squeeze-casting into a cellular ceramic preform [1], [7] and [8]. Interface behaviour between the matrix and the reinforcement can profoundly affect the properties of the MMCs [9].…”

Section: Introductionmentioning

confidence: 99%

“…Several IPCs with Mg-matrix have been reported [1], [7] and [8]. The AZ91, and AZ31 magnesium alloys were used for the matrix, whilst the reinforcing phase was the ceramic foam based on SiO 2 , SiO 2 -Al 2 O 3 , and SiC-SiO 2 -C-Si.…”

Section: Introductionmentioning

confidence: 99%

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Manufacturing and Properties of a Magnesium Interpenetrating Phase Composite

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Processing of Ceramic Foams with Hierarchical Cell Structure

2010

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Silicon carbide‐based cellular ceramics characterized by a hierarchical pore structure were processed. An open‐cellular PU foam template with a mean cell density of 10 pores per inch (ppi), equivalent to a cell diameter of 4 mm and a strut thickness of 250 µm, was coated with a primary SiC slurry. Cross‐linking of a polysiloxane binder at 190 h resulted in a SiC filled reticulated thermoset foam (first generation). Subsequently, this matrix foam was infiltrated with a second slurry of slightly different polysiloxane composition which upon heating to 290 °C caused bubble nucleation and formation of a second generation foam filling the cell space in the matrix foam skeleton. After pyrolysis at 1000 °C a SiC/SiOC reaction bonded composite foam with a hierarchical cell structure and a fractional density of 0.31 was obtained. SEM and X‐ray µ‐CT analyses confirm both generations of matrix as well as infiltrated foam to be open cellular but with a pronounced difference in cell size (matrix foam cell size 2.5 mm versus infiltrated foam cell size 0.29 mm). While the matrix foam skeleton provides control of macroscopic shape as well as density distribution in the component, single‐ or multistep foam infiltration may offer a high potential for improving the mechanical properties of hierarchical cellular materials. Thus, hierarchical structure formation offers a high potential to fabricate low density cellular ceramics which might be of interest for lightweight design of novel engineering materials.

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Mg alloy infiltrated Si–O–C ceramic foams

Cited by 27 publications

References 26 publications

Processing and characterization of polymer precursor derived silicon oxycarbide ceramic foams and compacts

Processing and characterization of polymer precursor derived silicon oxycarbide ceramic foams and compacts

Manufacturing and Properties of a Magnesium Interpenetrating Phase Composite

Processing of Ceramic Foams with Hierarchical Cell Structure

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