Fiber/matrix debonding evaluation of SiCf/SiC composites using micropillar compression technique

Karakoc, Omer; Koyanagi, Takaaki; Nozawa, Takashi; Katoh, Yutai

doi:10.1016/j.compositesb.2021.109189

Title: Fiber/matrix debonding evaluation of SiCf/SiC composites using micropillar compression technique

Journal Article · Thu Jul 29 00:00:00 EDT 2021 · Composites Part B: Engineering

DOI:https://doi.org/10.1016/j.compositesb.2021.109189· OSTI ID:1814337

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^[1]; Nozawa, Takashi ^[2];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Inst. for Quantum and Radiological Science and Technology (QST), Rokkasho (Japan)

Third-generation silicon carbide (SiC) composites reinforced by SiC fibers (Hi-Nicalon S [HNS] and Tyranno SA3 [SA3]) are attractive for use in next generation reactors owing to their high strength and chemical inertness at high temperatures, as well as enhanced radiation tolerance under neutron irradiation environments. To optimize composite performance, the interfacial mechanical properties of chemical vapor–infiltrated (CVI) SiC_f/SiC composites are investigated in this effort by using a slant interface micropillar compression testing procedure. The micropillar test specimens, containing an inclined pyrolytic carbon (PyC) interphase, are prepared using a focused ion beam. The novel microcompression testing successfully quantifies the debond shear strength and internal friction coefficient of micropillar test samples by using the Mohr-Coulomb formulation. Furthermore, according to four types of SiCf/SiC composite microcompression test results, interfacial properties and debond mechanisms are significantly affected by the PyC layer thickness, the local bonding mechanism of the PyC interphase on the SiC fiber surface, and the surface roughness of fibers. Regardless of PyC thicknesses, SA3-reinforced CVI SiC_f/SiC composites are found to have much higher debond shear strengths than HNS-reinforced SiC_f/SiC CVI composites. By using this micropillar compression technique alongside analytical methods, we uncover new understandings of PyC interface properties. Additionally, the micropillar test results obtained are correlated with macroscopic mechanical properties of neutron-irradiated CVI SiCf/SiC composites.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725; NFE-10-02779

OSTI ID:: 1814337

Alternate ID(s):: OSTI ID: 1811953

Journal Information:: Composites Part B: Engineering, Vol. 224, Issue -; ISSN 1359-8368

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Fiber/matrix debonding evaluation of SiCf/SiC composites using micropillar compression technique

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