Fiber coatings and the fracture behavior of a continuous fiber ceramic composite

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:175380

Miller, J H; Lowden, R A ^[1]; Liaw, P K ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. Univ. of Knoxville, TN (United States)

Continuous fiber reinforced ceramic composites (CFCC) are being recognized as necessary for high-temperature structural applications. For instance, the applications of SiC/SiC composites in elevated-temperature structures, such as first wall, and high heat flux surfaces in fusion reactors, as well as in combustors and boiler components in power generation systems, have drawn considerable attention. In the present study, Nicalon{sup {reg_sign}} plane-weave fiber reinforced SiC matrix composites have been fabricated by forced chemical vapor infiltration (FCVI) methods. The influence of fiber/matrix interface coating thickness on the fracture behavior of the continuous fiber reinforced SiC composites has been investigated. Experimental results indicate that fiber coating thickness significantly alters the fracture behavior of SiC composites. The fracture strength exhibits a maximum as the coating thickness increases. A mechanistic understanding of the fracture behavior is provided. Furthermore, a theoretical model is formulated to provide a better understanding of the effects of coating thickness on fracture behavior. The predicted fracture behavior was found to be in good agreement with the experimental results.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 175380
• Report Number(s): CONF-950686--; CNN: Contract 11X-SN191V
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COATINGS
COMPOSITE MATERIALS
FRACTURE PROPERTIES
HEAT FLUX
SILICON CARBIDES
SURFACES