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Processing of All-Oxide Ceramic Matrix Composites with RBAO Matrices
P.O. Guglielmi1, D.E. García2, M.P. Hablitzel2, D. Blaese1, D.P. Goulart2, A. Borchert1, D. Hotza3, R. Janssen1
1 Institute of Advanced Ceramics, Hamburg University of Technology (TUHH), Denickestrasse 15, 21073 Hamburg, Germany
2 Department of Mechanical Engineering (EMC), Federal University of Santa Catarina (UFSC), 88040 – 970 Florianópolis, Brazil
3 Department of Chemical Engineering (EQA), Federal University of Santa Catarina (UFSC), 88040 – 970 Florianópolis, Brazil
received Juli 23, 2015, received in revised form August 08, 2015, accepted September 30, 2015
Vol. 7, No. 1, Pages 87-96 DOI: 10.4416/JCST2015-00038
Abstract
A methodology to produce full-scale, all-oxide composites with porous reaction-bonded aluminum oxide (RBAO) matrices is presented. Composites are produced by a two-step impregnation route, in which alumina fiber fabrics are first infiltrated with an ethanol-based slurry of the RBAO particles and then laminated between layers of an RBAO-loaded paraffin-based suspension to produce thermoplastic prepregs. The composition of the RBAO precursor powders is tailored for each of these suspensions, so that low-to-zero shrinkage is achieved during sintering and all-oxide composites with a reduced amount of shrinkage-related matrix cracks are produced. Processing challenges faced during the development of these composites are presented and discussed. These include the formation of matrix voids owing to the evaporation of volatile species from the RBAO powder surfaces that remain entrapped in the paraffin-based suspension during lamination. Despite these voids, composites containing ∼ 36 vol% fibers exhibit a flexural strength of ∼ 240 MPa, together with a non-catastrophic, stepwise failure, similar to that of layered ceramics.
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Keywords
Ceramic matrix composites, RBAO, processing, microstructure, properties
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Copyright
Göller Verlag GmbH
Acknowledgments
The authors gratefully acknowledge the financial support of the German Research Foundation (DFG) under project JA 655/23 – 1 and the Brazilian institutions "Coordenação de Aperfeiçoamento de Pessoal de Nível Superior" (CAPES) and "Conselho Nacional de Desenvolvimento Científico e Tecnológico" (CNPq) under project 015/09.
