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Novel ceramic matrix composites with tungsten and molybdenum fiber reinforcement

Mainzer, Bernd ; Lin, Chaorong ; Friess, Martin ; Riedel, Ralf ; Riesch, Johann ; Feichtmayer, Alexander ; Fuhr, Maximilian ; Almanstötter, Jürgen ; Koch, Dietmar (2021):
Novel ceramic matrix composites with tungsten and molybdenum fiber reinforcement.
In: Journal of the European Ceramic Society, 41 (5), pp. 3030-3036. Elsevier Science Ltd., ISSN 0955-2219, e-ISSN 1873-619X,
DOI: 10.1016/j.jeurceramsoc.2019.10.049,
[Article]

Abstract

Ceramic matrix composites usually utilize carbon or ceramic fibers as reinforcements. However, such fibers often expose a low ductility during failure. In this work, we follow the idea of a reinforcement concept of a ceramic matrix reinforced by refractory metal fibers to reach pseudo ductile behavior during failure. Tungsten and molybdenum fibers were chosen as reinforcement in SiCN ceramic matrix composites manufactured by polymer infiltration and pyrolysis process. The composites were investigated with respect to microstructure, flexuraland tensile strength. The single fiber strengths for both tungsten and molybdenum were investigated and compared to the strength of the composites. Tensile strengths of 206 and 156 MPa as well as bending strengths of 427 and 312 MPa were achieved for W/SiCN and Mo/SiCN composites, respectively. The W fiber became brittle across the entire cross section, while the Mo fiber showed a superficial, brittle reaction zone but kept ductile on the inside.

Item Type: Article
Erschienen: 2021
Creators: Mainzer, Bernd ; Lin, Chaorong ; Friess, Martin ; Riedel, Ralf ; Riesch, Johann ; Feichtmayer, Alexander ; Fuhr, Maximilian ; Almanstötter, Jürgen ; Koch, Dietmar
Title: Novel ceramic matrix composites with tungsten and molybdenum fiber reinforcement
Language: English
Abstract:

Ceramic matrix composites usually utilize carbon or ceramic fibers as reinforcements. However, such fibers often expose a low ductility during failure. In this work, we follow the idea of a reinforcement concept of a ceramic matrix reinforced by refractory metal fibers to reach pseudo ductile behavior during failure. Tungsten and molybdenum fibers were chosen as reinforcement in SiCN ceramic matrix composites manufactured by polymer infiltration and pyrolysis process. The composites were investigated with respect to microstructure, flexuraland tensile strength. The single fiber strengths for both tungsten and molybdenum were investigated and compared to the strength of the composites. Tensile strengths of 206 and 156 MPa as well as bending strengths of 427 and 312 MPa were achieved for W/SiCN and Mo/SiCN composites, respectively. The W fiber became brittle across the entire cross section, while the Mo fiber showed a superficial, brittle reaction zone but kept ductile on the inside.

Journal or Publication Title: Journal of the European Ceramic Society
Journal volume: 41
Number: 5
Publisher: Elsevier Science Ltd.
Uncontrolled Keywords: Tungsten, Molybdenum, SiCN, CMC, Polysilazane, PIP
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 12 Mar 2021 07:17
DOI: 10.1016/j.jeurceramsoc.2019.10.049
Official URL: https://www.sciencedirect.com/science/article/abs/pii/S09552...
Additional Information:

Part of special issue: Science of High-Temperature Ceramic-matrix Composites

Projects: Federal Ministry of Education & Research (BMBF), Grant Number 03EK3544A
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