Ceramic Fibers Based on SiC and SiCN Systems: Current Research, Development, and Commercial Status

Flores, O.; Bordia, Rajendra K.; Nestler, Daisy; Krenkel, Walter; Motz, Günter

doi:10.1002/adem.201400069

Cited by 129 publications

(91 citation statements)

References 100 publications

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“…Research activities in the eld of high performance nonoxide ceramic bers led, over the last 50 years, to the development of commercially available chemical vapour deposited (CVD) SiC monolaments [1][2][3] and three generations of SiC bers based on polymer derived ceramics (PDCs).…”

Section: Introductionmentioning

confidence: 99%

Processing and characterization of large diameter ceramic SiCN monofilaments from commercial oligosilazanes

et al. 2015

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This work reports the processing of large diameter ceramic SiCN monofilaments via the precursor route using two chemically different polysilazanes ML33S and HTTS self-synthesized from respective commercially available oligosilazanes. The melt-spinning of continuous polymer fibers with controllable diameters from 35 to 150 mm and their pyrolysis to ceramic SiCN fibers is not influenced by differences in the chemical structure of the polysilazanes. In contrast, the necessary e-beam curing dose is reduced by Si-vinyl groups from 600 kGy for ML33S (vinyl free) to 200 kGy for HTTS derived polymer fibers. The curing step leads to an enhanced handleability important for further pyrolysis at 1100 C in nitrogen and to an increase in ceramic yield. The resulting ceramic SiCN fibers from both systems have similar mechanical and thermal behavior, indicating quite a low influence of the polysilazane type on these properties. For the first time a comprehensive investigation of the effect of fiber diameter on the tensile strength is reported for SiCN fibers. The average strength increases from $800 MPa for 90 mm diameter fibers to $1600 MPa for the 30 mm diameter fibers. Bend Stress Relaxation (BSR) tests demonstrated that no stress relaxation occurs up to 1000 C for SiCN monofilaments and the creep resistance is equal to or better than commercially available SiC monofilaments produced by chemical vapour deposition (CVD). The oxidation resistance is also comparable to commercially available oxygen free CVD SiC fibers (SCS-6). The ceramic fibers in this study were pyrolyzed at low temperature (1100 C) and have high oxygen content (13 to 29 wt%). The high temperature creep resistance and oxidation resistance is expected to improve if the oxygen content is reduced and the pyrolysis temperature increased.

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Section: Introductionmentioning

confidence: 99%

Processing and characterization of large diameter ceramic SiCN monofilaments from commercial oligosilazanes

et al. 2015

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“…The linear weight loss results from the high temperature instability of boria, given earlier by Reactions 6 -8 16 . The paralinear oxidation kinetics are characteristics of a non-protective oxide 11 creep resistance provided when the grain microstructure is fine, the Si: C ratio is stoichiometric, and the oxygen content is low 29 . A recent study by Wilson and Opila showed that commercially available Hi-Nicalon™ SiC fibers demonstrated Deal and Grove oxidation kinetics when exposed to dry oxygen environments 30 .…”

Section: Boron Nitride Oxidation Kineticsmentioning

confidence: 99%

“…This fiber, hereafter referred to as Sylramic, was reported by Lipowitz et al to be comprised of 95 wt% stoichiometric SiC, 3 wt% TiB2, 1.3 wt% B4C, 0.8 wt% O, and 0.7 wt% BN 34 . The fibers also contain free carbon 29,87 . The Sylramic fiber tow was supplied with a protective polyvinyl alcohol (PVA) sizing.…”

Section: Silicon Carbide Fibersmentioning

confidence: 99%

Boria Effects on the High Temperature Oxidation of Silicon Carbide

McFarland¹

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“…8) After that, many types of polymer-derived SiC fibers have been developed and commercialized. 3,4) These SiC fibers can show good mechanical strength and oxidation-resistance up to very high temperatures over 1000 o C. Of these SiC fibers, stoichiometric SiCpolycrystalline fibers (Tyranno SA, Hi-Nicalon Type S, and so on) have an excellent heat-resistance up to 2000 o C.…”

Section: -7)mentioning

confidence: 99%

Low Pressure Joining of SiCf/SiC Composites Using Ti3AlC2 or Ti3SiC2 MAX Phase Tape

Septiadi¹,

Fitriani²,

Sharma³

et al. 2017

J. Korean Ceram. Soc

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Tyranno SA (SiC-polycrystalline fiber, Ube Industries Ltd.) shows excellent heat-resistance up to 2000 o C with relatively high mechanical strength. This fiber is produced by the conversion process from a raw material (amorphous Si-Al-C-O fiber) into SiCpolycrystalline fiber at very high temperatures over 1500 o C in argon. In this conversion process, the degradation reaction of the amorphous Si-Al-C-O fiber accompanied by a release of CO gas for obtaining a stoichiometric composition and the subsequent sintering of the degraded fiber proceed. Furthermore, vaporization of gaseous SiO, phase transformation and active diffusion of the components of the Si-Al-C-O fiber competitively occur. Of these changes, vaporization of the gaseous SiO during the conversion process results in an abnormal SiC-grain growth and also leads to the non-stoichiometric composition. However, using a modified Si-Al-C-O fiber with an oxygen-rich surface, vaporization of the gaseous SiO was effectively prevented, and then consequently a nearly stoichiometric SiC composition could be obtained.

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Ceramic Fibers Based on SiC and SiCN Systems: Current Research, Development, and Commercial Status

Cited by 129 publications

References 100 publications

Processing and characterization of large diameter ceramic SiCN monofilaments from commercial oligosilazanes

Processing and characterization of large diameter ceramic SiCN monofilaments from commercial oligosilazanes

Boria Effects on the High Temperature Oxidation of Silicon Carbide

Low Pressure Joining of SiCf/SiC Composites Using Ti3AlC2 or Ti3SiC2 MAX Phase Tape

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