Strength and toughness of cellular SiC at elevated temperature

Presas, M.; Pastor, J.Y.; LLorca, J.; Martı́n, A.; Segurado, J.; González, C.

doi:10.1016/j.engfailanal.2009.04.029

Cited by 6 publications

(6 citation statements)

References 13 publications

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“…Fracture toughness figures of bio-SiC; for crack propagation perpendicular to the axial direction; are in agreement with the results obtained in the present study [28] . The multilayer Si/SiC samples studied here sustain stress after the outset of fracture.…”

Section: Resultssupporting

confidence: 92%

Synthesis and characterization of laminated Si/SiC composites

Naga¹,

Kenawy²,

Awaad³

et al. 2013

Journal of Advanced Research

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Laminated Si/SiC ceramics were synthesized from porous preforms of biogenous carbon impregnated with Si slurry at a temperature of 1500 °C for 2 h. Due to the capillarity infiltration with Si, both intrinsic micro- and macrostructure in the carbon preform were retained within the final ceramics. The SEM micrographs indicate that the final material exhibits a distinguished laminar structure with successive Si/SiC layers. The produced composites show weight gain of ≈5% after heat treatment in air at 1300 °C for 50 h. The produced bodies could be used as high temperature gas filters as indicated from the permeability results.

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Section: Resultssupporting

confidence: 92%

Synthesis and characterization of laminated Si/SiC composites

Naga¹,

Kenawy²,

Awaad³

et al. 2013

Journal of Advanced Research

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“…The obtained fracture toughnesses of porous SiC ceramics processed by partial sintering and by replica methods were 0.9 MPa m 1/2 at 64% porosity and 1.4 MPa m 1/2 at 50% porosity, respectively [58,64]. In porous SiC ceramics fabricated by the replica method, the fracture toughness ranged from 0.2 MPa m 1/2 at 95% porosity [81] to 1.4 MPa m 1/2 at 50% porosity [38]. The fracture toughness data of porous SiC ceramics fabricated by template method were quite limited and the toughness values were 0.3-0.4 MPa m 1/2 at 57-58% porosity [47].…”

Section: Fracture Toughnessmentioning

confidence: 93%

“…The RT-strength retention of maple-based and mahogany-based SiC ceramics was 67% and 78% at 1350 • C, respectively. The flexural strength of porous SiC ceramics, which were fabricated by CVD of SiC onto reticulated carbon skeletons obtained by pyrolysis of polyurethane foams, was 19 MPa at 200 • C and the material maintained its RT-strength up to 1400 • C [81]. The excellent strength retention of the porous CVD-SiC was attributed to its high purity, probably >99.9% pure.…”

Section: High Temperature Flexural Strengthmentioning

confidence: 98%

“…Singh and Salem [105] measured flexural strength of porous biomorphic SiC ceramics fabricated by the replica method at temperatures from RT to 1350 • C. Flexural strengths of SiC ceramics fabricated from maple wood precursors were 344 MPa and 230 MPa at RT and 1350 • C, respectively. In contrast, those of SiC ceramics fabricated from [37,47,81], Ref [58], and Ref. [64] were measured by a single-edge notched beam, a chevron-notched beam, and an indentation-strength method, respectively.…”

Section: High Temperature Flexural Strengthmentioning

confidence: 99%

“…It should be noted that the fracture toughness values plotted in Fig. 12 were measured in different methods: the data from Refs [38,47,81], Ref. [58], and Ref.…”

Section: Fracture Toughnessmentioning

confidence: 99%

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Processing and properties of macroporous silicon carbide ceramics: A review

Eom

Kim

Raju

2013

Journal of Asian Ceramic Societies

334

162

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Macroporous silicon carbide is widely used in various industrial applications including filtration for gas and water, absorption, catalyst supports, concentrated solar power, thermoelectric conversion, etc. During the past several years, many researchers have found diverse routes to fabricate macroporous SiC with porosity ranging from 9% to 95%. This review presents a detailed discussion on processing techniques such as partial sintering, replica, sacrificial template, direct foaming, and bonding techniques, as well as the mechanical and thermal properties of macroporous SiC ceramics fabricated using these methods. The full 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. From the collected data, we have found that the porosity ranges from 9% to 91% with flexural strength of 1-205 MPa, compressive strength of 1-600 MPa, fracture toughness of 0.3-4.3 MPa m 1/2 , and thermal conductivity of 2-82 W/(m•K). This review will enlighten future investigations on processing of porous SiC and its usage in various applications.

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