Conversion Process of Amorphous Si-Al-C-O Fiber into Nearly Stoichiometric SiC Polycrystalline Fiber

Usukawa, Ryutaro; Oda, Hiroshi; Ishikawa, Toshihiro

doi:10.4191/kcers.2016.53.6.610

Cited by 15 publications

(8 citation statements)

References 14 publications

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“…Since these structural changes proceed in each filament, strict control is needed to minimize residual defects. As mentioned above, to reduce the residual defects, we have proposed new conversion processes and demonstrated them in our previous reports [13][14][15]. A remarkable decrease in the number of inside defects was noticed after applying the aforementioned new processes.…”

Section: Introductionmentioning

confidence: 70%

“…However, to extend the application field, increases in the fiber's strength is eagerly required. Up to now, through our research, the relationship between the strength and the residual defects contained in the fiber, which were formed during the production processes, have been clarified [12][13][14][15]. In these studies, we have proposed several new methods for reducing the residual defects, and also demonstrated them using the conversion process, from amorphous Si-Al-C-O fiber to SiC-polycrystalline fiber (Tyranno SA).…”

Section: Introductionmentioning

confidence: 98%

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High-Performance SiC-Polycrystalline Fiber with Smooth Surface

Usukawa

Ishikawa

2018

Ceramics

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Polymer-derived SiC-polycrystalline fibers show excellent heat-resistance up to 2000 °C, and relatively high strength. Up to now, through our research, the relationship between the strength and residual defects of the fiber, which were formed during the production processes (degradation and sintering), has been clarified. In this paper, we addressed the relationship between the production conditions and the surface smoothness of the obtained SiC-polycrystalline fiber, using three different raw fibers (Elementary ratio: Si1Al0.01C1.5O0.4~0.5) and three different types of reactors. With increase in the oxygen content in the raw fiber, the degradation during the production process easily proceeded. In this case, the degradation reactions (SiO + 2C = SiC + CO and SiO2 + 3C = SiC + 2CO) in the inside of each filament become faster, and then the CO partial pressure on the surface of each filament was considered to be increased. As a result, according to Le Chatelier’s principle, the surface degradation reaction and grain growth of formed SiC crystals would be considered to become slower. That is to say, using the raw fiber with higher oxygen content and closed system (highest CO content in the reactor), a much smoother surface of the SiC-polycrystalline fiber could be achieved. Furthermore, the similar effect obtained by simple oxidation of the SiC-polycrystalline fiber was confirmed, and the advantageous points of the aforementioned process were also considered.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 98%

High-Performance SiC-Polycrystalline Fiber with Smooth Surface

Usukawa

Ishikawa

2018

Ceramics

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“…However, to extend the application field, increase in the fiber's strength is eagerly required. Up to now, through our research, the relationship between the strength and the residual defects contained in the fiber, which were formed during the production processes, has been clarified [6][7][8][9]. In these researches, we have proposed several new methods for reducing the residual defects, and also demonstrated them using the conversion process from amorphous Si-Al-C-O fiber to SiC-polycrystalline fiber (Tyranno SA).…”

Section: Introductionmentioning

confidence: 99%

High-Performance SiC-Polycrystalline Fiber with Smooth Surface

Usukawa¹,

Ishikawa²

2018

Preprint

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Polymer-derived SiC-polycrystalline fiber (Tyranno SA) shows excellent heat-resistance up to 2000oC, and relatively high strength. Up to now, through our research, the relationship between the strength and residual defects of the fiber, which were formed during the production processes (degradation and sintering), has been clarified. In this paper, we addressed the relationship between the production condition and the surface roughness of the obtained SiC-polycrystalline fiber, using three different raw fibers (Elementary ratio: Si1Al0.01C1.5O0.4~0.5) and three different types of reactor (Open system, Partially-open system, and Closed system). With increase in the oxygen content in the raw fiber, the degradation during the production process easily proceeded. In this case, the degradation reactions (SiO+2C=SiC+CO and SiO2+3C=SiC+2CO) in the inside of each filament become faster, and then the CO partial pressure on the surface of each filament is considered to be increased. In consequence, according to Le Chatelier’s principle, the surface degradation reaction and grain growth of formed SiC crystals would be considered to become slower. That is to say, using the raw fiber with higher oxygen content and closed system (highest CO content in the reactor), much smoother surface of the SiC-polycrystalline fiber could be achieved.

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“…Amorphous and crystalline SiC fibers are mainly derived from polymers, and polycarbosilane (PCS) is the commonly used SiC precursor. 12,13) PCS, which shows an average molecular weight of 3000-4000, is spun in the form of fibers by melt-spinning. These thermoplastic fibers are then converted into thermosetting fibers via a curing process.…”

Section: Introductionmentioning

confidence: 99%

Heat-Generating Behavior of SiC Fiber Mat Composites Embedded with Ceramic Powder for Heat Conservation

Joo¹,

Cho²

2019

J. Korean Ceram. Soc

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Silicon carbide (SiC) fiber mats generate large amounts of heat through microwave interactions and are used as heating elements in rapid heat treatment furnaces. However, SiC fibers cool immediately when the microwave power is turned off. Therefore, ceramic layers are inserted between the SiC fiber layers to improve the heat conservation performance of SiC fiber mats. In this study, we fabricated SiC fiber mat composites (SMCs) with ceramic layers under various pressures. The SMC fabricated under 0.007 kPa showed the lowest heat-generating temperature and deviation because less necking was observed between the materials. On the other hand, the SMC fabricated under 0.375 kPa showed the highest heat-generating temperature of 1532.33°C. The SMCs prepared in this study using ceramic powder not only showed heat-generating temperatures comparable to those of conventional SiC fiber mats but also exhibited excellent heat-preserving ability.

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Conversion Process of Amorphous Si-Al-C-O Fiber into Nearly Stoichiometric SiC Polycrystalline Fiber

Cited by 15 publications

References 14 publications

High-Performance SiC-Polycrystalline Fiber with Smooth Surface

High-Performance SiC-Polycrystalline Fiber with Smooth Surface

High-Performance SiC-Polycrystalline Fiber with Smooth Surface

Heat-Generating Behavior of SiC Fiber Mat Composites Embedded with Ceramic Powder for Heat Conservation

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