Low-temperature processing of porous SiC ceramics

Lim, Kwang-Young; Kim, Young‐Wook; Song, In‐Hyuck

doi:10.1007/s10853-012-6963-4

Cited by 32 publications

(21 citation statements)

References 52 publications

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“…As shown in Figure , the flexural strength of the glass‐bonded SiC membrane supports increased with increasing porosity. This trend is very unusual in porous SiC ceramics; the flexural strength of porous SiC ceramics generally decreases with increasing porosity . These results indicate that the flexural strength of glass‐bonded porous SiC ceramics depends more on pore size than on porosity, at least in a porosity range 42%‐45%.…”

Section: Resultsmentioning

confidence: 82%

“…In addition, these materials are vulnerable to densification and require high energy consumption when sintered at temperatures greater than 1700°C. Two processing routes are used to fabricate porous SiC ceramics at lower temperatures: the use of preceramic polymers as a precursor for SiC and the use of bonding materials . Mullite (3Al 2 O 3 ·2SiO 2 ), silica (SiO 2 ), silicon oxycarbide (SiOC), sodium borate, cordierite, and glass frit have been investigated as bonding materials for porous SiC ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Processing of alumina‐coated glass‐bonded silicon carbide membranes for oily wastewater treatment

Kim

Yeom

Kim

et al. 2017

Int J Applied Ceramic Tech

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Crack‐free γ‐Al2O3‐coated glass‐bonded SiC membranes were successfully prepared using a simple heat‐treatment and dip‐coating process at a temperature as low as 850°C in air. The changes in the porosity, flexural strength, flux, and oil rejection rate of the membranes were investigated while changing the initial SiC particle size. Larger SiC particles led to bigger pores, resulting in higher flux in the oily water and a lower oil rejection rate. The SiC membranes with a support prepared from 10 μm SiC powder showed an exceptionally high oil rejection rate (99.9%) with a feed oil concentration of 600 mg/L at an applied pressure of 101 kPa. The typical porosity, flexural strength, steady state flux, and oil rejection rate of the alumina‐coated SiC membrane were ~45%, ~81 MPa, 1.78×10−5 m3 m−2s−1, and 99.9%, respectively.

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Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Processing of alumina‐coated glass‐bonded silicon carbide membranes for oily wastewater treatment

Kim

Yeom

Kim

et al. 2017

Int J Applied Ceramic Tech

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“…Silica, silicon resin, silicon-oxycarbide, silicon nitride, alumina, mullite and cordierite, etc. are the low-temperature bonding material for SiC particle reported in the literature [14,15]. Porous SiC with sodium borate as bonding material can achieve good porosities ranging from 47 to 64 % at a low temperature of 600-800°C [16].…”

Section: Introductionmentioning

confidence: 99%

Processing of silica bonded porous SiC preform for metallic composites

et al. 2015

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Porous SiC ceramics were successfully fabricated by silica bonding of SiC compacts and porogen burnout technique. Silica coating on SiC particle was carried out using TEOS hydrolysis and crystallizes during the sintering process at 1200°C, which forms a well-developed neck growth between the SiC particles. Different volume fractions of sodium chloride porogen were used to obtain varied porosity content in porous SiC ceramics from 36 to 62.47 % leading to wide-ranging compressive strength from 8.11 to 0.69 MPa. Interconnected bimodal pores were created throughout the sample due to the burnt out of salt and stacking of SiC particles. The pore size distribution of porous SiC measured using mercury intrusion porosimetry shows that average pore size due to the salt particle is around 74-110 lm and stacking of SiC particle result 4-10 lm. Direct squeeze infiltration method is successfully adopted for infiltration of 6061 aluminium molten alloy into SiC preforms with the controlled process parameters of initial preform temperature, liquid metal superheating, squeezed pressure and its rate of application and die temperature. Microstructures have shown complete infiltration of Al alloy into the pores of the SiC preform forming Al composite with good interfacial bonding aided by the presence of MgAl 2 O 4 spinel. The silica coating on SiC surface have a multifunctional role of acting as a binder for the porous preform, enhances the wettability of SiC particle with molten metal during infiltration and prevention of deleterious Al 4 C 3 interfacial reaction product.

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“…In addition to the above functions, a guarantee of strength is essential in porous ceramics. It has been known for a long time that the strength of porous ceramics increases exponentially with decreasing porosity [14,15]. However, we clarified that the strength of porous alumina compacts during the initial sintering stage is enhanced with an increase in the grain boundary area at a constant porosity [16].…”

Section: Introductionmentioning

confidence: 69%