Potential of innovative ceramics for turbine applications

Julian-Jankowiak, Aurélie; Valle, R.; Parlier, M.

doi:10.1080/09603409.2016.1166686

Cited by 8 publications

(5 citation statements)

References 45 publications

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“…It has been demonstrated that rheological properties of slurries strongly affect the infiltration process of ceramic particles through fabric strands . For particles to properly infiltrate the fibrous reinforcement, they must exhibit an evenly distributed and non‐aggregated state on the liquid suspension.…”

Section: Resultsmentioning

confidence: 99%

Novel device for in situ process characterization of oxide/oxide ceramic matrix composites fabricated by flexible injection

et al. 2018

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In this work, a new manufacturing process of CMC by liquid molding was stud-ied. An instrumented device has been developed to characterize the through-thickness impregnation of ceramic fibers by a slurry charged with submicron ceramic particles. This instrument was used to characterize the permeability of the fibrous reinforcement and the formation of the ceramic cake by filtration of a ceramic particle suspension. Slurries containing different concentrations (10, 25, 33, and 40 vol%) of mono-dispersed alumina particles were filtered under different pressure conditions (345, 415, 485 kPa) to optimize the cake formation and filling of fibrous reinforcements while controlling the porosity level. Ceramic cakes exhibited an average permeability of 1.0 × 10 −17 m 2 while the manufactured all-oxide composites resulted in a permeability of 0.6 × 10 −17 m 2 . Furthermore, a mathematical model based on Darcy's law was developed in this study to predict the rate of filtering and cake formation during injection using the permeability and filtration data measured with the experimental device. This mathematical model allows to determine the filtration time to produce a dense ceramic composite with an accuracy of ±15%, which corresponds to an error of less than 0.1 mm on the thickness of formed CMC. K E Y W O R D Sceramic-matrix composites, liquid composite molding, permeability

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Section: Resultsmentioning

confidence: 99%

Novel device for in situ process characterization of oxide/oxide ceramic matrix composites fabricated by flexible injection

et al. 2018

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“…On the basis of Si 3 N 4 , SiAlON ceramics have been studied since the early 1970s and are industrially relevant today in the areas of cutting tools, high-temperature bearings, and combustion engine components. [1][2][3][4][5][6][7][8] Moreover, SiAlONs have recently shown promise for use as biomedical implants due to their combination of excellent mechanical properties and favorable surface chemistry. 9,10 However, despite the outstanding fracture toughness of SiAlONs, these materials still lack the reliability and robustness to meet the stringent requirements of some of their high-risk applications.…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of Si 3 N 4 , SiAlON ceramics have been studied since the early 1970s and are industrially relevant today in the areas of cutting tools, high‐temperature bearings, and combustion engine components 1–8 . Moreover, SiAlONs have recently shown promise for use as biomedical implants due to their combination of excellent mechanical properties and favorable surface chemistry 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Exploration of an atomic‐scale boron additive in SiAlON ceramics

McGarrity,

Tumurugoti,

Ning

et al. 2024

Int J Ceramic Engine & Sci

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SiAlON ceramics are of interest for high‐risk applications such as biomedical implants and combustion engine turbines. This work is part of a larger study aimed at leveraging atomic‐ or molecular‐scale additives to control the densification, microstructures, and ultimate structural properties of SiAlONs. Here, we investigate the effects of boron in silicon nitride‐based ceramics. The present work demonstrates a possible chemical method for controlling the microstructural development of SiAlONs by incorporating boric acid (H3BO3) into the starting powder blend. Raman spectroscopy and 11B solid‐state magic angle spinning nuclear magnetic resonance cooperatively indicate that after sintering, boron exists in threefold coordination with nitrogen in the turbostratic boron nitride (t‐BN) structure. The results of this work indicate that the incorporation of boron and generation of t‐BN bonding in the SiAlON system result in a narrower grain size distribution, a suppression of second phases such as yttrium aluminosilicates, and ultimately, increased flexure strength. A separate fractographic study showed that SiAlONs fabricated with 3 wt% boric acid exhibited fracture origins such as subtle surface flaws or cracks, while lower dopant levels and undoped SiAlONs typically failed from flaws such as inclusions or large grains. It is argued that the modification of the intergranular glass chemistry and resulting generation of t‐BN reduces atomic diffusion through the grain boundary phase and inhibits the crystallization of second phases as well as exaggerated grain growth that often characterizes the development of β′‐SiAlON.

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“…[11][12][13] In addition to their utilization in gas turbine engines, they can be used in ships and eventually in aircra turbines. 14,15 The use of these materials in aeronautics will depend not only on superior engineering design, but also more importantly on the availability of the eutectic ceramic with a signicant advantage in high-temperature morphology and microstructure over the presently available metals and alloys. With the melting temperature around 1750 C, the system is stable and presents performed mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The impact of the composition and solidification rate on the microstructure and the crystallographic orientations of Al₂O₃–YAG–ZrO₂ eutectic solidified by the micro-pulling down technique

Benamara

Lebbou

2021

RSC Adv.

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Potential of innovative ceramics for turbine applications

Cited by 8 publications

References 45 publications

Novel device for in situ process characterization of oxide/oxide ceramic matrix composites fabricated by flexible injection

Novel device for in situ process characterization of oxide/oxide ceramic matrix composites fabricated by flexible injection

Exploration of an atomic‐scale boron additive in SiAlON ceramics

The impact of the composition and solidification rate on the microstructure and the crystallographic orientations of Al₂O₃–YAG–ZrO₂ eutectic solidified by the micro-pulling down technique

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Potential of innovative ceramics for turbine applications

Cited by 8 publications

References 45 publications

Novel device for in situ process characterization of oxide/oxide ceramic matrix composites fabricated by flexible injection

Novel device for in situ process characterization of oxide/oxide ceramic matrix composites fabricated by flexible injection

Exploration of an atomic‐scale boron additive in SiAlON ceramics

The impact of the composition and solidification rate on the microstructure and the crystallographic orientations of Al2O3–YAG–ZrO2 eutectic solidified by the micro-pulling down technique

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The impact of the composition and solidification rate on the microstructure and the crystallographic orientations of Al₂O₃–YAG–ZrO₂ eutectic solidified by the micro-pulling down technique