Thermal stability of the low-oxygen-content silicon carbide fiber, Hi-NicalonTM

Takeda, Michio; Sakamoto, Junichi; Imai, Yoshikazu; Ichikawa, Hiroshi

doi:10.1016/s0266-3538(99)00012-3

Cited by 83 publications

(45 citation statements)

References 8 publications

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“…Therefore, the studies of oxidation kinetics, microstructural, and mechanical changes have been extensively conducted for the fibers exposed in oxidizing environments such as air, O 2 gas, and a H 2 -H 2 O gas mixture. [1][2][3][4][5][6][7][8][9][10][11][12][13] Researchers have also investigated the oxidation of the fibers in a wide range of oxygen partial pressures of Ar-O 2 gas mixtures, resulting in determination of the oxidation mechanism, the suppression effect of SiO 2 film on the thermal decomposition of SiC fibers, and the active-to-passive transition for the oxidation of the fibers, etc. 14 -22 High-temperature application of SiC fibers to the hot section components of gas turbines, piston engines, and heat exchanger tubes involves exposure to combustion environments.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Low‐Oxygen Silicon Carbide Fibers (Hi‐Nicalon) in Carbon Dioxide

Shimoo

Morita

Okamura

2001

Journal of the American Ceramic Society

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Polycarbosilane-derived low-oxygen SiC fibers, Hi-Nicalon, were heat-treated for 36 ks at temperatures from 1273 to 1773 K in CO 2 gas. The oxidation of the fibers was investigated through the examination of mass change, crystal phase, resistivity, morphology, and tensile strength. The mass gain, growth of ␤-SiC crystallites, reduction of resistivity of the fiber core, and formation of protective SiO 2 film were observed for the fibers after heat treatment in CO 2 gas. SiO 2 film crystallized into cristobalite above 1573 K. Despite the low oxygen potential of CO 2 gas (p O 2 ‫؍‬ 1.22 Pa at 1273 K ؊ 1.78 ؋ 10 2 Pa at 1773 K), Hi-Nicalon fibers were passively oxidized at a high rate. There was a large loss of tensile strength in the asoxidized state at higher temperatures because of imperfections in the SiO 2 film. On the other hand, the fiber cores showed better strength retention even after oxidation at 1773 K.

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Section: Introductionmentioning

confidence: 99%

Oxidation of Low‐Oxygen Silicon Carbide Fibers (Hi‐Nicalon) in Carbon Dioxide

Shimoo

Morita

Okamura

2001

Journal of the American Ceramic Society

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“…The cross-linking process has been the subject of a number of studies and can make a summary of that oxygen reacts with the Si-H bonds and creates Si-O-Si bridges [13]. After pyrolysis, the structure will convert into a ternary amorphous silicon oxycarbide (SiC x O y ) which can decompose and be oxidized according to the following reactions at elevated temperature [14,15]:…”

Section: Discussionmentioning

confidence: 99%

SiC fiber with low electrical resistivity and oxygen content

Mao

Song

Wang

2010

Sci. China Technol. Sci.

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A new SiC fiber was prepared by the pyrolysis of polycarbosilane (PCS) fiber cured with unsaturated hydrocarbons. The fiber, with oxygen content of 4-6 wt%, offers high tensile strength of 2.5-2.8 GPa. The electrical resistivity of the fiber is only about 0.5 Ω·cm, much lower than general SiC fiber obtained from traditional air curing process. Degradation of mechanical property in argon and air at high temperature is retarded by 200-300°C with respect to the Nicalon NL-202 fiber. The low electrical resistivity of the fiber exhibits excellent thermal stability, it almost remains 0.4-0.8 Ω·cm after thermal exposure test from the room temperature to 1600°C in argon. The low electrical resistivity mainly attribute to an excess carbon layer which is about 50 nm in the circular outer part. polycarbonsilane, SiC fiber, electrical resistivity, excess carbon layer Citation:Wang D Y, Mao X H, Song Y C, et al. SiC fiber with low electrical resistivity and oxygen content.

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“…Continuous SiC fiber production can be divided largely into three phases: synthesis of an organometallic polymer PCS precursor, fiber spinning and curing of spun fiber, and high temperature pyrolysis [5]. The curing is a sensitive process that cross-links PCS, converting the linear structure of thermoplastic polymer into thermosetting polymer under a series of reactions, including dehydrogenation and oxidation.…”

Section: Introductionmentioning

confidence: 99%

Effect of heating rate on the properties of silicon carbide fiber with chemical-vapor-cured polycarbosilane fiber

2017

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Silicon carbide (SiC) fiber has recently received considerable attention as promising next-generation fiber because of its high strength at temperatures greater than 1300 ℃ in air. High-quality SiC fiber is primarily made through a curing and heat treatment process. In this study, the chemical vapor curing method, instead of the thermal oxidation curing method, was used to prepare cured polycarbosilane (PCS) fiber. During the high temperature heat treatment of the cured PCS fiber, varied heating rates of 10, 20, 30, and 40 ℃/min were applied. Throughout the process, the fiber remained in the amorphous silicon carbide phase, and the measured tensile strength was the greatest when the oxygen content in the heat-treated fiber was low, due to the rapid heating rate. The fiber produced through this method was also found to have excellent internal oxidation properties. This fast, continuous process shows а great promise for the production of SiC fiber and the development of high-quality products.

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Thermal stability of the low-oxygen-content silicon carbide fiber, Hi-NicalonTM

Cited by 83 publications

References 8 publications

Oxidation of Low‐Oxygen Silicon Carbide Fibers (Hi‐Nicalon) in Carbon Dioxide

Oxidation of Low‐Oxygen Silicon Carbide Fibers (Hi‐Nicalon) in Carbon Dioxide

SiC fiber with low electrical resistivity and oxygen content

Effect of heating rate on the properties of silicon carbide fiber with chemical-vapor-cured polycarbosilane fiber

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