Effect of Thermal Cycling to the Strength and Fracture of SiC-Based Candle Filters

Pastila, Pirjo; Nikkilä, A.-P.; Mäntylä, T.

doi:10.1002/9780470294741.ch71

Cited by 7 publications

(7 citation statements)

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“…Well‐developed necks were seen to bridge the gaps between contacting SiC particles. Such necks connecting the SiC particles were also observed by Pastila et al . in microstructure of clay‐bonded porous SiC ceramics.…”

Section: Resultssupporting

confidence: 76%

“…Well-developed necks were seen to bridge the gaps between contacting SiC particles. Such necks connecting the SiC particles were also observed by Pastila et al 23 in microstructure of claybonded porous SiC ceramics. Samples were seen to have an interconnected pore network; they differed in porosity, but showed nearly similar distribution patterns of pore diameters (for illustration, pore diameter distribution patterns were presented in Fig.…”

Section: Materials Characterizationsupporting

confidence: 76%

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Investigations on Material and Mechanical Properties, Air‐Permeation Behavior and Filtration Performance of Mullite‐Bonded Porous SiC Ceramics

Dey

Kayal

Chakrabarti

et al. 2013

Int J Applied Ceramic Tech

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A theoretical relation between processing parameters and porosity (29-56%) of mullite-bonded porous SiC ceramics was derived and validated with experimental data. Porosity-dependent variation of fracture strength (9-34 MPa) and elastic modulus (7-28 GPa) was explained by the minimum solid area model. At room temperature, the Darcian, k 1 (1.2 9 10 À13 -1.6 9 10 À12 m 2 ) and the non-Darcian, k 2 (4.6 9 10 À9 -2.7 9 10 À7 m) permeability coefficients showed linear variation with porosity. Tests conducted up to 650°C indicated an increase in k 1 with temperature and a reverse trend for k 2 . Airborne NaCl nanoparticle filtration tests showed good performance of SiC ceramics with fractional collection efficiency of >99% at 46-56% porosity levels.*omprakash@cgcri.res.in

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Section: Resultssupporting

confidence: 76%

Section: Materials Characterizationsupporting

confidence: 76%

Investigations on Material and Mechanical Properties, Air‐Permeation Behavior and Filtration Performance of Mullite‐Bonded Porous SiC Ceramics

Dey

Kayal

Chakrabarti

et al. 2013

Int J Applied Ceramic Tech

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“…The E o values of the sintered ceramics were approximated by the rule of mixture. The phase compositions of the sintered ceramics (calculated theoretically following the procedure described in Appendix A) and the values of Young's moduli of SiC (E SiC ¼450 GPa) [27], mullite (E mullite ¼150 GPa) [28] and cristobalite (E cristobalite ¼72.0 GPa) [29] were used for this purpose. The E-values of the sintered ceramics were calculated using Eq.…”

Section: Mechanical Characterization Of Porous Sic Ceramicsmentioning

confidence: 99%

Synthesis of mullite bonded porous SiC ceramics by a liquid precursor infiltration method: Effect of sintering temperature on material and mechanical properties

Kayal

Dey

Chakrabarti

2012

Materials Science and Engineering: A

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“…Cyclic thermal shocks during evaluation tests have generally been provided by rapid heating and cooling of O-ring test specimens obtained from filters. 4 Thermal stresses can also be induced by applying a large temperature gradient across the inner and outer surfaces of the specimen, where the outer surface is sealed with insulating tape. 5 Under actual operating conditions, however, thermal stresses are produced by the cyclic blowing of air through the filter while it is exposed to a high-temperature flue gas.…”

Section: Introductionmentioning

confidence: 99%

Thermal Cyclic Fatigue Behavior of Porous Ceramics for Gas Cleaning

Kitaoka

Matsushima

Chen

et al. 2004

Journal of the American Ceramic Society

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The thermal shock fatigue resistance of cordierite and SiC filters with a mullite filtration layer was evaluated under simulated reverse cleaning conditions. O‐ring specimens were thermally shocked by cyclically blowing cold air outward through them while they were exposed to high‐temperature flue gas. The calculated values of the tangential tensile stresses induced by the temperature differences between the inner and outer surfaces were found to be largest at the inner surfaces. It was also found that the elastic modulus and the thermal expansion coefficient of the filters affect the magnitude of the thermal stresses more than the thermal diffusivity and thermal transfer area, which were directly related to the microstructure of the filters. Failure of both filters is believed to have initiated at the inner subsurfaces because of the effects of thermal shock. The thermal shock fatigue lifetimes increased as thermal stresses decreased. The fatigue parameters for the SiC and cordierite filters were found to be 41 and 22, respectively. These parameters probably vary over different operating temperature ranges, especially in the case of SiC filters, where changes in their composite microstructures affect their high‐temperature strength.

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Effect of Thermal Cycling to the Strength and Fracture of SiC-Based Candle Filters

Cited by 7 publications

References 0 publications

Investigations on Material and Mechanical Properties, Air‐Permeation Behavior and Filtration Performance of Mullite‐Bonded Porous SiC Ceramics

Investigations on Material and Mechanical Properties, Air‐Permeation Behavior and Filtration Performance of Mullite‐Bonded Porous SiC Ceramics

Synthesis of mullite bonded porous SiC ceramics by a liquid precursor infiltration method: Effect of sintering temperature on material and mechanical properties

Thermal Cyclic Fatigue Behavior of Porous Ceramics for Gas Cleaning

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