Application Technique and Evaluation for Functional and Structural Design of Ceramics.

Okabe, Nagatoshi

doi:10.2109/jcersj.109.1276_s135

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…1) For example, in the case of the familiar conventional reaction sintering SiC (RS-SiC), the pores exist the grain boundaries and occupy approximately 2 vol of amount of RS-SiC and then the residual non-reacted Si distributes un-uniformly.…”

Section: Introductionmentioning

confidence: 99%

Study for the origin of fracture of advanced pore-free silicon carbide with damage tolerance

Matsuda

Matsushita

Takahashi

et al. 2008

J. Ceram. Soc. Japan

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It had been well known that the fracture of SiC manufactured by conventional reaction sintering method was caused by one of the pores in that. However, according to the recent studies, pore free SiC so called APF-SiC was developed by improvement of reaction sintering method. As the result, the strength and the damage tolerance ability rise and then the cause of fracture of APF-SiC changed from pores to something else. Therefore we have investigated fracture surface of APF-SiC by using FE-SEM and EDS in order to demonstrate the cause of fracture. As the result, we found the inclusion that consisted of allotropes of Carbon covered with very thin SiO 2 and SiN layer. And the size of the inclusion is ten times larger than that of SiC grain. Considering from present results, the inclusion is the one of the cause of fracture of APF-SiC.

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Section: Introductionmentioning

confidence: 99%

Study for the origin of fracture of advanced pore-free silicon carbide with damage tolerance

Matsuda

Matsushita

Takahashi

et al. 2008

J. Ceram. Soc. Japan

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Influence of Silicon Nitride Properties on Bonding Strength of Silicon Nitride and Stainless Steel Brazed Joints

昌子¹,

祐司²,

敏明³

et al. 2003

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Strength Estimation and Optimum Reliability Design of Ceramic Cylinder Component Subjected to Thermal Shock at Trip

Sakuma¹,

Okabe²,

Suzuki³

2005

J. Soc. Mat. Sci., Japan

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Ceramic parts such as a combustor of gas turbine requires the design considering strength reliability, because ceramics are easily fractured by thermal stress due to rapid changes of temperature. Therefore, it is essential to estimate the thermal shock stress and is also necessary to control the cooling rate of ceramic parts. In this paper, the thermal stresses at trip and steady state in a ceramic combustor liner are analyzed numerically by using a simple ceramic cylinder model, which is heated from the inside and is cooled from the outside. The propability of failure of a ceramic cylinder subjected to thermal stresses both at trip and steady state is also analyzed theoretically. As a result, the thermal shock stress at trip decreases with the increase in cooling rate at steady state. However, because the thermal stress at steady state increases with the increase in cooling rate, the cooling rate at steady state should be optimized to minimize the propability of failure in the ceramic cylinder system, considering the thickness of cylinder.

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Application Technique and Evaluation for Functional and Structural Design of Ceramics.

Cited by 4 publications

References 3 publications

Study for the origin of fracture of advanced pore-free silicon carbide with damage tolerance

Study for the origin of fracture of advanced pore-free silicon carbide with damage tolerance

Influence of Silicon Nitride Properties on Bonding Strength of Silicon Nitride and Stainless Steel Brazed Joints

Strength Estimation and Optimum Reliability Design of Ceramic Cylinder Component Subjected to Thermal Shock at Trip

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