Relationship between matrix porosity and flexural strength of short fiber reinforced all-oxide ceramic matrix composites

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00008887
URN to cite this document: urn:nbn:de:bvb:703-epub-8887-7

Title data

Wagner, Lukas ; Puchas, Georg ; Schafföner, Stefan:
Relationship between matrix porosity and flexural strength of short fiber reinforced all-oxide ceramic matrix composites.
In: Journal of the European Ceramic Society. Vol. 46 (2026) Issue 5 . - 118020.
ISSN 0955-2219
DOI der Verlagsversion: https://doi.org/10.1016/j.jeurceramsoc.2025.118020

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Project information

Project title:	Project's official title Project's id Flexible, automatisierte Herstellung von keramischen Kurzfaserverbund-Bauteilen (FlexFiber) 518255159 Open Access Publizieren No information
Project financing:	Deutsche Forschungsgemeinschaft

Abstract

This study analyzes the influence of porosity on Nextel™ 610/Al2O3-ZrO2 short-fiber-reinforced composites for the first time. Its goal was the comparison of a short-fiber-reinforced all-oxide ceramic matrix composite (SF-Ox/Ox) with a fabric-reinforced material. Since the matrix system and the processing were the same for both materials, differences can be related to the use of short-fibers instead of fabrics. Zirconium-n-butoxide was infiltrated to decrease the porosity from 46 % to 32 %, which increased the bending strength and the Young’s modulus from 85 ± 19 MPa to 120 ± 23 MPa and 40 ± 10 GPa to 82 ± 12 GPa, respectively. The strain decreased with decreasing porosity from 0.25 ± 0.05 % to 0.16 ± 0.03 %. The damage-tolerant behavior was maintained for all samples, which was never shown for SF-Ox/Ox in such a porosity range. The less anisotropic alignment of the short-fibers is therefore advantageous for crack-deflection. This offers the possibility to obtain damage-tolerance while having a denser matrix system.

Further data

Item Type:	Article in a journal
Keywords:	Porosity; Damage tolerance; Mechanical testing; Ceramic-matrix composites (CMCs); All-oxide CMC (Ox/Ox)
DDC Subjects:	600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Ceramic Materials > Chair Ceramic Materials - Univ.-Prof. Dr.-Ing. Stefan Schafföner Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Ceramic Materials
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-8887-7
Date Deposited:	13 Feb 2026 09:01
Last Modified:	13 Feb 2026 09:02
URI:	https://epub.uni-bayreuth.de/id/eprint/8887

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