Microstructure and oxidative degradation behavior of silicon carbide fiber Hi-Nicalon type S

Takeda, Michio; Urano, Akira; Sakamoto, Junichi; Imai, Yoshikazu

doi:10.1016/s0022-3115(98)00223-2

Cited by 106 publications

(64 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Type-S fiber contains lower oxygen and has near-stoichiometric chemical composition and highly crystalline structure, while the other low oxygen fibers are composed of excess carbon and insufficiently crystalline structure. Representative properties and chemical compositions of the fibers 12,15) are compiled in Table 1. The matrix of a unidirectional fiber-reinforced composite was formed by chemical vapor infiltration (CVI) method.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Fiber Properties on Neutron Irradiated SiC/SiC Composites

Hinoki

Katoh

2002

Mater. Trans.

View full text Add to dashboard Cite

The use of SiC/SiC composites for nuclear application has recently been considered because of intrinsic low activation and superior high temperature mechanical properties of SiC. The property of SiC fiber is a key issue in order to improve mechanical properties of SiC/SiC composites following irradiation. SiC/SiC composites with unidirectional fibers were fabricated by chemical vapor infiltration method. Low oxygen and highly crystalline fibers or just low oxygen fibers were used in the composites. The specimens were irradiated at Japan Material Testing Reactor and High Flux Isotope Reactor. The effects of neutron irradiation on mechanical properties were examined by three points flexural test. Microstructure and fracture behavior were observed by scanning electron microscopy before and after neutron irradiation. The SiC/SiC composites with a low oxygen content, near-stoichiometric atomic composition and highly crystalline SiC fibers showed the excellent stability to neutron irradiation. The mechanical property of this material did not degrade, even after neutron irradiation up to 10 dpa, while the other materials with non-highly crystalline SiC fibers degraded significantly.

show abstract

Section: Methodsmentioning

confidence: 99%

“…The development of SiC composite with radiationresistance is based on the use of stoichiometric SiC fibers with lower oxygen and SiC-based interphase. Recently, stoichiometric SiC fibers have been developed such as Hi-Nicalon TM Type-S, 12) Sylramic TM13) and Tyranno TM SA.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fiber Properties on Neutron Irradiated SiC/SiC Composites

Hinoki

Katoh

2002

Mater. Trans.

View full text Add to dashboard Cite

show abstract

“…Several studies have investigated the thermal stability of SiC fibers in oxidizing environments and the effects of oxidation on SiC fibers and its relation to subcritical crack growth (delayed failure) [24,43,49,105,111,121,[123][124][125][126][142][143][144][145][146][147][148][149][150][151][152][153][154][155][156][157][158]. LaraCurzio modeled the effects of oxidation on the stress-rupture behavior of fiber bundles and presented results for Nicalon T M fibers.…”

Section: Environmental Effects On the Durability Of Sic Fibers And Simentioning

confidence: 99%

Creep of Hi-Nicalon S Ceramic Fiber Tows at 800 deg C in Air and in Silicic Acid-Saturated Steam

Robertson¹

2015

View full text Add to dashboard Cite

“…In recent years, various approaches such as improvements of constituents, process optimization, thermal and environmental barrier coatings (TBC/EBC) have been pointed out to address this issue. [3][4][5][6] From the viewpoint of development of composite constituents, tailoring the high-crystallinity and near-stoichiometry composition is essential for the improvement of oxidation resistance. Actually, Hi-Nicalon TM Type-S and Tyranno TM -SA fibers, recently developed highly crystalline and near-stoichiometric SiC fibers, exhibited excellent thermo-mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Actually, Hi-Nicalon TM Type-S and Tyranno TM -SA fibers, recently developed highly crystalline and near-stoichiometric SiC fibers, exhibited excellent thermo-mechanical properties. 3,4) In particular, the latter one is known to have superior oxidation resistance up to 2273 K in Ar and 1773 K in air. From these facts, this approach should be beneficial to SiC matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Mechanical Properties of Stoichiometric SiC/SiC Composites

2004

View full text Add to dashboard Cite

Polymer impregnation and pyrolysis (PIP) is one of the most attractive fabrication processes for silicon carbide (SiC) composites due to the shape flexibility, mass production and relatively low cost. In particular, advanced PIP SiC/SiC composite with high-crystallinity and nearstoichiometric composition is expected to have superior thermo-mechanical properties including good oxidation resistance, due to the reduction of impurities and well-organized crystal structure. Additionally, by applying a thin carbon interphase by chemical vapor infiltration (CVI), control of the crack propagation and oxidation resistance are also achieved. In this study, a CVI + PIP hybrid process based on the recently developed stoichiometric PIP process was performed. Specifically, matrix crystallization was enhanced by heat treatment in Ar, and its effect on microstructures and mechanical properties were evaluated. Stoichiometric SiC/SiC composites exhibit superior flexural strength up to 1573 K in Ar and 1273 K in air. This is because the stoichiometric composition in PIP-SiC matrix reduces inner oxidation by impurities. Also, the thin pyrolytic carbon interphase tailored by CVI process effectively controls crack propagation at fiber and matrix interphase. In a similar manner, the microstructure of the stoichiometric PIP-SiC matrix, constructed by the mixture of amorphous SiC and highly crystalline SiC, was stable against the high-temperature heat exposure up to 1773 K in Ar. In particular, stoichiometric SiC/SiC composites heated at 1773 K in Ar provides superior stability of mechanical properties up to 1573 K even in air atmosphere, although extensive crystallization, in the case of heat treatment at 1973 K in Ar, caused brittle composite fracture.

show abstract

Microstructure and oxidative degradation behavior of silicon carbide fiber Hi-Nicalon type S

Cited by 106 publications

References 10 publications

Effect of Fiber Properties on Neutron Irradiated SiC/SiC Composites

Effect of Fiber Properties on Neutron Irradiated SiC/SiC Composites

Creep of Hi-Nicalon S Ceramic Fiber Tows at 800 deg C in Air and in Silicic Acid-Saturated Steam

Effect of Heat Treatment on Microstructure and Mechanical Properties of Stoichiometric SiC/SiC Composites

Contact Info

Product

Resources

About