Mechanical and interfacial properties of SiC fiber‐reinforced SiC composites

Issue title: International Conference on Complexity and Frontiers in Strength and Fracture (ICS 2001), Sendai, Japan, 24–27 June 2001 Part III (final part)

Article type: Research Article

Authors: Yano, Toyohiko^; | Yoshida, Katsumi

Affiliations: Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2‐12‐1, O‐okayama, Meguro‐ku, Tokyo 152‐8550, Japan | Faculty of Engineering, Chiba Institute of Technology, 2‐17‐1, Tsudanuma, Narashino 275‐0016, Japan

Note: [] Corresponding author. E‐mail: [email protected].

Abstract: The interfacial strength of SiC/SiC composites fabricated by hot‐pressing (HP) and CVI method was measured by push‐in test, and the relation between interfacial and mechanical properties of the composites was investigated. Maximum strength and fracture energy of the CVI‐composite was higher than those of the HP‐composite due to lower interfacial shear sliding strength and higher fiber strength. The composite hot‐pressed at 1750°C had a higher interfacial shear sliding strength, lower fiber strength, shorter fiber pull‐out length and a smaller single fiber pull‐out energy, resulting in low maximum strength and fracture energy. The composite hot‐pressed at 1650°C showed a lower maximum strength and higher fracture energy in spite of a lower interfacial shear sliding strength, higher fiber strength, larger fiber pull‐out length and a single fiber pull‐out energy. In this case, the delamination between fiber and the matrix occurs easily.

Keywords: SiC/SiC, fiber‐reinforced composite, mechanical property, interfacial property, push‐in test, interfacial shear sliding strength, fiber pull‐out energy

Journal: Strength, Fracture and Complexity, vol. 1, no. 3, pp. 157-165, 2003