Synthesis of continuous silicon carbide fibre with high tensile strength and high Young's modulus

Yajima, Seishi; Hasegawa, Yoshio; Hayashi, J.; Iimura, M.

doi:10.1007/pl00020149

Cited by 150 publications

(162 citation statements)

References 15 publications

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“…Morphological characteristics were obtained by transmission electron microscopy (TEM, Philips CM12). [7,8]. The presence of Si-CH 3 functional group confirms the formation of polydimethylsilane.…”

Section: Characterizationmentioning

confidence: 74%

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Synthesis and characterization of high ceramic yield polycarbosilane precursor for SiC

et al. 2015

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Abstract:The polycarbosilane (PCS) precursor for SiC with high molecular weight and medium molecular weight distribution was synthesized from polydimethylsilane at normal pressure. The chemical formula, the number average molecular weight, and the polydispersivity index of the synthesized PCS are SiC 1.94 H 5.01 O 0.028 , 1135, and 1.66, respectively, which can be attributed to the higher reaction temperature used for polymerization. The polymer to ceramic conversion of PCS was completed at 900 ℃ with a ceramic yield of 85%. The crystallization started at 1100 ℃, and at 1200 ℃, well resolved peaks of β-SiC were formed with small amount of α-cristobalite. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies indicated the presence of nanocrystalline β-SiC.

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Section: Characterizationmentioning

confidence: 74%

“…Polydimethylsilane was synthesized by the reaction of dimethyldichlorosilane with sodium in xylene at 120 ℃ as reported elsewhere [7]. Metallic sodium was chopped into 5 mm × 5 mm pieces and introduced into reaction flask containing xylene.…”

Section: Synthesis Of Polydimethylsilanementioning

confidence: 99%

Synthesis and characterization of high ceramic yield polycarbosilane precursor for SiC

et al. 2015

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“…The 1 Н NMR spectrum of nano-MCS contains two wide asymmetric signals typical for a spectrum of polycarbosilanes [30]. The first signal centered around 0.3 ppm with two small faint shoulders refers to protons of SiCH 3 , SiCH and SiCH 2 groups.…”

Section: Nmr Spectroscopymentioning

confidence: 99%

Nanometallocarbosilanes: Synthesis, Physicochemical Properties and Structure

Щербакова¹,

Стороженко²,

Blokhina³

et al. 2014

JCCE

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Abstract:Highly efficient synthesis methods have been developed and characteristics of nanometallocarbosilanes molecular structure were studied by the research team of GNIIChTEOS (State Research Institute for Chemistry and Technology of Organoelement Compounds). Nanometallocarbosilanes were synthesized by thermal co-condensation of oligocarbosilanes and alkyl amides of refractory metals. Initial, intermediate and final products of side reactions were characterized by 1 H, 13 C, 29 Si NMR (nuclear magnetic resonance), IR (infra-red) spectroscopy, GPC (gel-penetrating chromatography), TGA (thermal gravimetric analysis), TEM (transmission electron microscopy), SEM (scanning electron microscopy), RES (X-ray phase analysis) and elemental analysis. The proposed synthesis method of nanometallocarbosilanes was found to produce fusable soluble organosilicon oligomers with homogeneous distribution of nanoscale (10-20 nm) metal particles in the oligomer matrix. A computational model of the group and elemental composition of nanometallocarbosilanes was developed; it was shown that they are molecular globules of near-spherical shape and rigid polycyclic structure. Thermochemical treatment of nanometallocarbosilanes leads to SiC-nanoceramics (a high yield of up to 75-80 mass%) modified by metal nanoparticles (20-30 nm) contributing to its stabilization. The application of preceramic oxygen-free nanometallocarbosilanes will make it possible to advance in solving the problem of ceramic composite materials with long-term resistance at temperatures above 1,500 °C in oxidizing environments.

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“…Volumetric yield from raw polymer to the pyrolyzed ceramic product can be totally estimated as the product of a reciprocal number of the ratio of density and the residual weight ratio. Most commonly used polymers of about 1 g/cm 3 decompose into inorganic products of approximately 2.5 g/cm 3 at a weight yield of approximately 70 wt %, 14)17) with volumetric yields typically about 30 vol % (e.g., 1 g/cm 3 ª 2.5 g/cm 3 © 70%). Even though it is conceivable to increase volumetric yield up to nearly 40vol % by improving weight yield to almost 100 wt %, shrinkage of 60 vol % still remains due to unavoidable molecular transference.…”

Section: )13)mentioning

confidence: 99%

Processing of polymer-derived porous SiC body using allylhydridopolycarbosilane (AHPCS) and PMMA microbeads

Kotani

Nishiyabu²,

Matsuzaki

et al. 2011

J. Ceram. Soc. Japan

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A simple method for making a porous SiC body through a polymeric route at one firing processing was demonstrated by the sacrificial filler template approach. By incorporating sacrificial pore-forming plastic powder, PMMA microbeads, into liquid preceramic polymer, AHPCS, and losing it after the polymer was hardened, a preceramic porous body was formed. As a consequence of systematic examination of the effects of particle size and mixture ratio of the powder, an AHPCS-derived porous SiC body was reproducibly formed without critical crack initiation. It was enabled only when the polymer was sufficiently contained to make a strong skeletal structure with the sacrificial plastic particles closely distributed. The porous microstructure would contribute to efficient gas emission and uniform thermal shrinkage during polymer pyrolysis, which reduced internal pressure and crack-causing thermal stress.

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Synthesis of continuous silicon carbide fibre with high tensile strength and high Young's modulus

Cited by 150 publications

References 15 publications

Synthesis and characterization of high ceramic yield polycarbosilane precursor for SiC

Synthesis and characterization of high ceramic yield polycarbosilane precursor for SiC

Nanometallocarbosilanes: Synthesis, Physicochemical Properties and Structure

Processing of polymer-derived porous SiC body using allylhydridopolycarbosilane (AHPCS) and PMMA microbeads

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