Mechanical characterization of a polysiloxane-derived SiOC glass

Moysan, Claude; Riedel, Ralf; Harshe, Rahul; Rouxel, Tanguy; Augereau, F.

doi:10.1016/j.jeurceramsoc.2006.01.016

Cited by 122 publications

(126 citation statements)

References 15 publications

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“…The shear viscosities of the samples were calculated from the experimental strain rate versus stress data according to g ¼ r0 2_ eð1þvÞ , 7,23 where v is the Poisson's ratio (0.11 for SiOC 24 ). As expected, the results from Table IV underestimate the "static elasticity" of the samples, since the viscoelastic model (1) is designed for a fluid behavior.…”

Section: Resultsmentioning

confidence: 99%

High‐Temperature Creep Behavior ofSiOCGlass‐Ceramics: Influence of Network Carbon Versus Segregated Carbon

et al. 2014

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Three silicon oxycarbide samples with different carbon contents are analyzed in the present study with respect to their hightemperature creep behavior. The tests were performed in compression at 1100°C, 1200°C, and 1300°C; in this temperature range the mechanism of creep relies on viscoelastic flow within the samples and has been modeled with the Jeffreys viscoelastic model. After the release of the applied mechanical stress, a viscoelastic recovery behavior was observed in all samples. The creep behavior of the investigated samples indicates two rheological contributions in SiOC: (i) a high viscous answer, coming from the silica-rich network, and (ii) an elastic response from the segregated carbon phase within the samples. Furthermore, two distinct effects of the carbon phase on the HT creep behavior of SiOC were identified and are discussed in the present paper: the effect of the carbon presence within the SiOC network (the "carbidic" carbon), which induces a significant increase in the viscosity and a strong decrease in the activation energy for creep, as compared to vitreous silica; and the influence of the segregated carbon phase (the "free" carbon), which has been shown to affect the viscosity and the activation energy of creep and dominates the creep behavior in phase-separated silicon oxycarbides.

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Section: Resultsmentioning

confidence: 99%

High‐Temperature Creep Behavior ofSiOCGlass‐Ceramics: Influence of Network Carbon Versus Segregated Carbon

et al. 2014

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“…Therefore, these materials feature both SiO 2 and SiC bonds. This leads to the strengthening of glass structure and enhancement of its properties, i.e., chemical, thermal, and oxidation resistance [1][2][3][4]. Two main concepts of silicon oxycarbide structures exist.…”

Section: Introductionmentioning

confidence: 99%

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Jeleń

Szumera

Gawęda

et al. 2017

J Therm Anal Calorim

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Pyrolysis of ladder-like silsesquioxanes in oxygen-free atmosphere leads to the formation of silicon oxycarbides (black glasses). Black glasses are materials of amorphous silica structure where some amount of O 2-ions were replaced by C 4-ions. This exchange leads to local increase in bonds density and therefore improvement in mechanical, thermal, and chemical properties. Thanks to this modification, silicon oxycarbide glasses can be used in a variety of applications like: protective coatings and interconnectors in solid oxide fuel cells. Xerogels were prepared by sol-gel method, and ladder-like silsesquioxanes were used as precursors. Samples were burned at 200-1000°C in inert atmosphere. Structural studies in the middle infrared range (MIR) and SEM with EDX confirmed the presence of SiOC bonds in obtained materials. MIR analysis of solid samples together with TG/dTG measurements allowed defining the process for the formation of black glasses.

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“…The viscosity of SiLuOC was found to be higher than for the single-phasic ternary system with 0.5 wt.% segregated carbon 2) and even higher than that of SiAlOC, 29) which was already used by Plachký et al as sintering additive for Si 3 N 4 . 10) As already mentioned, common sintering additives for Si 3 Consequently, depending on the type of additive, SiYAlON or SiRE(Al,Mg)ON glasses can be expected to be present as grain-boundary phases in common Si 3 N 4 materials produced by liquid-phase sintering. The viscosity of this glassy phase at the sintering temperature determines on the one hand the densification during sintering and on the other hand the HT performance of the resulting ceramic.…”

Section: Resultsmentioning

confidence: 99%

“…The samples were ground to be plane parallel with respect to the creep loaded surfaces and rectangular in shape with dimensions of 3 © 3 © 5 mm 3 . The creep behavior was studied in the temperature range between 1100 and 1300°C using a constant true stress of 75 MPa.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and high-temperature creep behavior of a SiLuOC-based glass-ceramic

Stabler

Seemüller

Choudhary

et al. 2016

J. Ceram. Soc. Japan

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In this work, a lutetium-modified silicon oxycarbide (SiOC) glass ceramic was prepared from a single-source precursor via pyrolysis and subsequent hot pressing. It is shown that the main crystalline phase in the hot-pressed SiLuOC is Lu 2 Si 2 O 7 . The high-temperature (HT) creep behavior of SiLuOC was assessed by compression creep experiments performed between 1100 and 1300°C at constant true stresses between 25 and 75 MPa. The calculated viscosity values of SiLuOC were found to be significantly higher as compared to those of SiRE(Al,Mg)ON glasses (RE = rare earth elements). Thus, the presented SiLuOC-based glasses might be used as alternative sintering aids for the liquid-phase sintering of HT creep resistant Si 3 N 4 monolithic samples.

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Mechanical characterization of a polysiloxane-derived SiOC glass

Cited by 122 publications

References 15 publications

High‐Temperature Creep Behavior ofSiOCGlass‐Ceramics: Influence of Network Carbon Versus Segregated Carbon

High‐Temperature Creep Behavior ofSiOCGlass‐Ceramics: Influence of Network Carbon Versus Segregated Carbon

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Synthesis and high-temperature creep behavior of a SiLuOC-based glass-ceramic

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