Microstructure and flexural properties of multilayered fiber-reinforced oxide composites fabricated by a novel lamination route. Issue 6 (July 2015)

• Record Type: Journal Article
• Authors: Guglielmi, Paula O.; Blaese, Diego; Hablitzel, Murilo P.; Nunes, Gabriel F.; Lauth, Victor R.; Hotza, Dachamir; Al-Qureshi, Hazim A.; Janssen, Rolf
• Is Part Of: Ceramics international. Volume 41:Issue 6(2015)
• Page Start: 7836
• Page End: 7846
• Publication Date: 2015-07
• Subjects: Ceramic matrix composites -- Thermoplastic prepregs -- Lamination -- Alumina -- Zirconia; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.02.120
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: All-oxide ceramic matrix composites produced by a novel route based on the lamination of thermoplastic prepregs are investigated. This route allows for the production of composites with very homogeneous microstructures and a reduced amount of matrix cracks. Nextel TM 610 alumina woven fabric is used here to reinforce a porous oxide matrix composed of 80 vol% Al2 O3 and 20 vol% ZrO2 . The mechanical behavior of composites submitted to different heat treatments is investigated under 4-point bending and short beam shear. Results show that composites with low interlaminar shear strength present a graceful failure under 4-point bending, characterized by a stepwise stress reduction upon straining beyond the peak stress. The fracture of such composites is accompanied by a series of interfacial delamination events, which enhance energy dissipation during failure. An increase of the interlaminar shear strength due to matrix densification causes a loss of the stepped stress–strain behavior. Nevertheless, fiber-related toughening mechanisms such as crack deflection and bridging still ensure inelastic deformation up to failure of these composites.