Short Fiber Ceramic Matrix Composites (SF-CMCs)

Krenkel, Walter; Flauder, Stefan; Puchas, Georg

doi:10.1016/b978-0-12-818542-1.00071-0

Cited by 4 publications

(20 citation statements)

References 88 publications

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“…Polyvinyl alcohol sizing was necessary for processing the rovings and preserving the bundle structure of the short fibers. In previous investigations, 24 it was already demonstrated that despite the use of sized fibers for fiber spraying, the resulting damage tolerant fracture behavior is similar to that of desized long fiber‐reinforced OFC. Two slurries with differing solid content were processed.…”

Section: Methodsmentioning

confidence: 91%

“…Thus, a previous study reported that the tensile strengths of an OFC with a fiber volume content of 48% decreased from 300 MPa, in 0°/90° direction, to about 60 MPa in ±45° direction 2 . Considering the bending strength, the strength decreased from 237 MPa (0°/90°) to 69 MPa in off‐axis orientation (±45°) 24 …”

Section: Introductionmentioning

confidence: 90%

“…Furthermore, the use of short fibers instead of woven fabrics results in a material cost reduction of up to 30% for the same fiber volume content 6 . When using rovings with higher filament counts, material costs can be reduced up to 60% 23,24 . Increased automation could lower costs even further.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to fabrics, there are no preferred directions in the plane. The composite, therefore, exhibits in‐plane isotropic mechanical properties or only a slightly preferred fiber bundle direction 24 . Fabrics, on the other hand, exhibit a strong anisotropy.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the fiber bundles have to be completely infiltrated with a low viscosity slurry in order to mechanically decouple the single fibers from each other. This allowed the fabrication of SF‐OFC with a fiber volume content of 21%, an apparent porosity of 40 vol%, and a mean bending strength of 90 MPa, independent of the loading direction 24 . While the basic feasibility of the process was demonstrated, there is currently no detailed investigation of the mechanisms of short fiber bundle‐reinforcements, as they already partly exist for nonoxide short fiber CMCs 24 …”

Section: Introductionmentioning

confidence: 99%

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Short fiber‐reinforced oxide fiber composites

Winkelbauer

Puchas

Schafföner

et al. 2021

Int J Applied Ceramic Tech

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This paper presents a novel fiber spraying process for the manufacturing of short fiber bundle‐reinforced Nextel™ 610/Al2O3‐ZrO2 oxide fiber composites (SF‐OFC) and its characterization. First, the influence of varying fiber lengths (7, 14, and 28 mm, continuous fibers) and fiber orientations (unidirectional 0°, quasi‐isotropic, ±45°) was investigated using hand‐laid SF‐OFC. Due to the weak matrix, the hand‐laid material exhibited a strongly fiber‐dominated material behavior, that is, variations in fiber length and orientation had a strong influence on the material properties. Second, the automated sprayed SF‐OFC, however, exhibited a random orientation of the fiber bundles, which resulted in in‐plane isotropic material properties. Average bending strengths of up to 177 MPa, strains of .39%, and a quasi‐ductile fracture behavior were achieved. The strain was, therefore, in the range of fabric‐reinforced OFC. While the bending strength of the SF‐OFC was somewhat lower than that of fabric‐reinforced OFC with the fiber orientation parallel to the loading direction, it was more than two times higher than the strength in 45° direction relative to the fabric reinforcement. Combined with good drapability and lower material costs compared to fabric‐reinforced OFC, SF‐OFC is, therefore, a promising material for industrial applications.

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Section: Methodsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Short fiber‐reinforced oxide fiber composites

Winkelbauer

Puchas

Schafföner

et al. 2021

Int J Applied Ceramic Tech

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Additive Manufacturing of Fiber‐Reinforced Zirconia‐Toughened Alumina Ceramic Matrix Composites by Material Extrusion‐Based Technology

Hadian,

Duckek,

Parrilli

et al. 2024

Adv Eng Mater

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Material extrusion‐based additive manufacturing (MEX‐AM) become interesting to fabricate oxide ceramic matrix composites (O‐CMCs). In this work, 0‐30 vol% alumina fibers are added to a zirconia toughened alumina (ZTA) powder mixture and extruded into filaments. Shrinkage and mechanical properties of filaments and 3D printed samples are investigated. Thermomechanical analysis is conducted on filaments with and without fiber content indicating lower shrinkage in the direction of fiber alignment during the sintering process. The flexural strength of the extruded filaments and printed bars is measured through a 4‐point bending test. Filaments containing 15 vol% fiber exhibit the highest flexural strength of 110 MPa, with additional fiber content leading to a reduction in flexural strength. Using Weibull calculation, it is observed that printed bars without fibers result in significantly lower bending strength in comparison to the filaments because of the presence of printing failures. Bars with 10 vol% fibers, printed with 0° infill orientation achieve the same mechanical properties as the filaments, even though in micro computed tomography gaps between printed lines and voids between raster lines can be observed. These results demonstrate that fiber reinforcement of ceramics offers a great potential to avoid the reduction of mechanical properties by printing defects.This article is protected by copyright. All rights reserved.

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Short fiber spraying process of all‐oxide ceramic matrix composites: A parameter study

Winkelbauer

Puchas

Krenkel

et al. 2022

Int J Applied Ceramic Tech

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Fiber spraying processes have been established for polymer matrix composites for decades. In this study, we transferred an automated fiber spraying process to short fiber bundle‐reinforced Nextel 610/ Al2O3‐ZrO2 oxide fiber composites (SF‐OFC). The effect of the processing factors travel height, spray angle, and movement speed on the specimen strength was analyzed in a full factorial experimental design. As a result, the significance of the travel height as well as the interaction between travel height and movement speed was demonstrated. Furthermore, the influence of the fiber length (14, 28, 56, and 112 mm) on the bending stress and strain was investigated. Independent of the used fiber length, the SF‐OFC exhibited an excellent quasi‐ductile fracture behavior with bending strains in the range of .6% and in‐plane isotropic material properties. The average bending strength increased from 133 ± 27 MPa with 14 mm fiber reinforcements to 163 ± 29 MPa with 112 mm fibers. The achieved bending strengths clearly exceeded the off‐axis properties of currently used fabric‐reinforced OFC. These properties, combined with the excellent drapability and cost effectiveness, make the novel material highly promising for industrial applications such as flame tubes, burner nozzles, kiln furnitures, or foundry components.

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Short Fiber Ceramic Matrix Composites (SF-CMCs)

Cited by 4 publications

References 88 publications

Short fiber‐reinforced oxide fiber composites

Short fiber‐reinforced oxide fiber composites

Additive Manufacturing of Fiber‐Reinforced Zirconia‐Toughened Alumina Ceramic Matrix Composites by Material Extrusion‐Based Technology

Short fiber spraying process of all‐oxide ceramic matrix composites: A parameter study

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