Design of a pilot-scale microwave heated chemical vapor infiltration plant: An innovative approach

D’Ambrosio, Roberto; Aliotta, Laura; Gigante, Vito; Coltelli, Maria Beatrice; Annino, G.; Lazzeri, Andrea

doi:10.1016/j.jeurceramsoc.2020.05.073

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…It has been shown that, by using microwaves to enhance the CVI process [37,38], fabrication times can be reduced from several hundred hours to around 100 hours [39,40] and down to only ≈25 hours when RF-CVI is used to produce C 𝑓 -ultra high temperature ceramic matrix composites (UHTCMCs) [41]. Similar results were obtained with the MW-CVI pilot plant developed in the European project HELM for the production of SiC-based CMCs (HELM: High-frequency Electro-Magnetic technologies for advanced processing of ceramic matrix composites and graphite expansion) [42]. The Horizon 2020 project CEM-WAVE aims at developing with this technology both oxide and non-oxide CMC tube parts to replace metals in radiant combustion tubes used in secondary steelmaking.…”

Section: Introductionmentioning

confidence: 74%

How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

et al. 2023

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Section: Introductionmentioning

confidence: 74%

How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

et al. 2023

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“…Binner et al 8 . applied microwave‐assisted CVI to form

{\rm SiC}_f/{\rm SiC}

composites with SiC powder, and reached the average densities as high as 75% after 10 h. D'Ambrosio et al 9 . described the design of a pilot‐scale microwave‐assisted CVI plant in Europe.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature inversion on densification in chemical vapor infiltration

Ramanuj,

Li,

et al. 2024

J Am Ceram Soc.

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In a classical chemical vapor infiltration (CVI) process, the competing effects of chemical kinetics and reagent gas transport lead to non‐uniform depositions such that outer layers of a preform densify faster leaving the core highly porous. Currently, CVI must be performed at a sufficiently low temperature to achieve good densification quality which leads to high processing time and cost. Volumetric heating of the preform, especially through microwaves, can create temperature inversion such that the core is hotter than the outer surface and potentially, overcome the challenges associated with isothermal CVI. Direct numerical simulations (DNS) of densification under various such temperature distributions indicate that microwave heating in CVI processing can lead to better (uniform) densification of porous preforms. The role of key parameters describing the temperature distributions on the densification behavior is investigated. Strategic temporal control of the temperature distribution shows that processing times can be reduced by almost half while maintaining a good densification quality similar to that of low‐temperature isothermal processing. Inside‐out densification due to the inverted temperature profile is a key distinguishing characteristic of microwave assisted CVI.

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Pore evolution and mechanical response under locally varying density defects in ceramic matrix composites

Liang,

Gao,

et al. 2024

Composites Part B: Engineering

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Design of a pilot-scale microwave heated chemical vapor infiltration plant: An innovative approach

Cited by 6 publications

References 28 publications

How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

Effects of temperature inversion on densification in chemical vapor infiltration

Pore evolution and mechanical response under locally varying density defects in ceramic matrix composites

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