Conceptual design and manufacture of spirally wound alumina tubes with improved thermal shock behavior for refractory applications

Jakobsen, Daniel; Rauch, Hunter A.; Dudczig, Steffen; Schumacher, Daniel; Roosen, Andreas

doi:10.1016/j.jmatprotec.2015.10.024

Cited by 4 publications

(1 citation statement)

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“…The external crucible (A) was designed to minimize MW absorption and reflection by selecting a material which is transparent at the chosen electromagnetic wave frequency and by minimizing the crucible wall thickness. Specifically, a 0.3 mm thick tape of alumina, produced by tape casting, was coiled into several layers and sintered, resulting in a wall thickness of 1 mm.…”

Section: Methodsmentioning

confidence: 99%

Microwave heating controlled reactive melt infiltration for graphite‐Si‐SiC ceramics manufacturing

et al. 2018

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In this work, we investigated a procedure which exploits microwave ovens to produce SiC-based components by reactive melt infiltration of silicon into graphite preforms. The employed oven is designed to grant optical access to the sample surface, which allows to measure its temperature evolution though a noncontact pyrometer. This signal was used as a feedback to control the power provided to the preform and as an experimental output whose analysis provides insight into the reaction mechanism. Specifically, it is found that complete infiltration is achieved much before the end of the reaction. The latter is not fully self-sustained as the global reaction rate continuously decreases with time until it is no more able to keep the temperature above the silicon solidification value. At that point, the reaction stops. The analysis of the processed samples proved that this procedure allows producing fully infiltrated samples without material failure by adjusting the heat provided during the infiltration stage rather than by tuning the preform structure and composition, which is the usual approach. The proposed method is less time and energy consuming than the standard one.

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Section: Methodsmentioning

confidence: 99%