SIMPLE SYNTHESIS OF THE CONTINUOUS SiC FIBER WITH HIGH TENSILE STRENGTH

Yajima, Seishi; Omori, Mamoru; Hayashi, J.; Okamura, Koji; Matsuzawa, Takuro; Liaw, C. F.

doi:10.1246/cl.1976.551

Cited by 105 publications

(53 citation statements)

References 1 publication

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“…The first polymer-derived SiC fiber was synthesized from polycarbosilane by Professor Yajima in the middle 1970s. 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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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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“…[41][42][43][44][45] Yajima and co-workers prepared silicon carbide SiC by pyrolysis of polycarbosilane PCS obtained from polydimethylsilane, which was synthesized by alkali-metal-promoted dehalocoupling of chlorosilanes Wurtz coupling. [43][44][45][46][47][48] The conversion of polysilane PS into PCS, often called the Kumada rearrangement, [49][50][51] occurs at ࣽ470c C via a radical mechanism. Polycarbosilane with a 50-55ಚ yield was obtained through this route.…”

Section: Precursors For Non-oxide Ceramicsmentioning

confidence: 99%

Pyrolytic Organic-to-Inorganic Conversion of Precursors into AlN-A Review

Mori¹,

Sugahara²

2006

J. Ceram. Soc. Japan

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ሱᑿ-ᠪᑿং၁ɟɵɃɁǺȗȚ AlN ǽΰ⓯ ἕ◻ ᎓ ؊͒ɿ≐‫ڤ‬ῲ˴ ᅤᨀগકᥴకકȤඅ᧸‫ك‬કᲇࢫ169-8555 ኇ̸ȩᄽٚগ˳Є 3-4-1 Pyrolyticéorganic-to-inorganicêconversion of precursors preceramic materials into aluminum nitride AlN has been investigated for the past few decades. AlN precursors can be classified based on their starting aluminum compounds organoaluminum compounds, inorganic compounds containing aluminum, and metallic aluminum. The preparation of various AlN precursors and their conversion mechanisms during pyrolysis are reviewed.

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“…Such a mechanism was used to explain the structural changes occurring during pyrolysis of polydimethylsilane, 4,40 polyvinylsilane 29 and polymethylsilane 28 into polycarbosilane polymers. Poly(borodiphenylsiloxane) (PBDPSO) and other boron derivatives, such as BTMS, were found useful for promoting this transformation.…”

Section: Kumada Rearrangementmentioning

confidence: 99%

Stoichiometric silicon carbide from borate‐catalyzed polymethylsilane–polyvinylsilane formulations

Boury

Bryson²,

Soula³

1999

Appl. Organometal. Chem.

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Polymethylsilane (PMS) and polyvinysilane (PVS) were prepared by Wurtz condensation of chlorosilanes and characterized by spectroscopy (1H, 13C and 29Si NMR, and infrared), viscosity and GPC analysis. Mixtures of the PMS and PVS were prepared and stabilized with 2,6‐di‐t‐butyl‐4‐methylphenol (BHT; 0.5 wt%) to which was added a catalytic amount of tris(trimethylsilyl)borate, B(OSiMe3)3 (BTMS; 2 wt% by weight). The resulting liquid materials were pyrolyzed to 950 °C and to 1400 °C under argon. The formulation, composed of 60% PMS / 40% PVS / 2% BTMS, was pyrolyzed and gives nearly stoichiometric silicon carbide in 73% yield. The pyrolyzate was analyzed spectroscopically at intermediate stages in order to study its thermal transformations and the influence of the boron catalyst. The ceramic obtained from the formulation 60% PMS / 40% PVS / 2% BTMS shows good stability at 1500 °C under oxygen. Copyright © 1999 John Wiley & Sons, Ltd.

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SIMPLE SYNTHESIS OF THE CONTINUOUS SiC FIBER WITH HIGH TENSILE STRENGTH

Abstract: A polycarbosilane, the starting material of β-SiC fibers, was prepared without autoclave. The new method is simple and more economical than the previous one. Furthermore, a great number of bundles of SiC fibers were obtained by way of oxidative reactions of polycarbosilane fibers.

Cited by 105 publications

References 1 publication

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

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

Pyrolytic Organic-to-Inorganic Conversion of Precursors into AlN-A Review

Stoichiometric silicon carbide from borate‐catalyzed polymethylsilane–polyvinylsilane formulations

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