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Materials 2019, 12(5), 830;

Instrumented Indentation of Super-Insulating Silica Compacts

Univ Lyon, INSA-Lyon, MATEIS, UMR CNRS 5510—7 avenue Jean Capelle, F-69621 Villeurbanne, France
Univ Lyon, INSA-Lyon, CNRS, UCBL, MATEB, 7 avenue Jean Capelle, F-69621 Villeurbanne, France
EDF R&D, Les Renardières, F-77250 Moret sur Loing, France
Author to whom correspondence should be addressed.
Received: 10 February 2019 / Revised: 5 March 2019 / Accepted: 7 March 2019 / Published: 12 March 2019
(This article belongs to the Special Issue Brittle Materials in Mechanical Extremes)
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Highly porous silica compacts for superinsulation were characterized by instrumented indentation. Samples showed a multi-scale stacking of silica particles with a total porous fraction of 90 vol %. The two main sources of silica available for the superinsulation market were considered: fumed silica and precipitated silica. The compacts processed with these two silica displayed different mechanical properties at a similar porosity fraction, thus leading to different usage properties, as the superinsulation market requires sufficient mechanical properties at the lowest density. The measurement of Young’s modulus and hardness was possible with spherical indentation, which is an efficient method for characterizing highly porous structures. Comparison of the mechanical parameters measured on silica compacts and silica aerogels available from the literature was made. Differences in mechanical properties between fumed and precipitated compacts were explained by structural organization. View Full-Text
Keywords: silica; super-insulating materials; instrumented indentation; porosity silica; super-insulating materials; instrumented indentation; porosity

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Benane, B.; Meille, S.; Foray, G.; Yrieix, B.; Olagnon, C. Instrumented Indentation of Super-Insulating Silica Compacts. Materials 2019, 12, 830.

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