Instrumented Indentation of Super-Insulating Silica Compacts.

Materials (Basel)

Univ Lyon, INSA-Lyon, MATEIS, UMR CNRS 5510-7 avenue Jean Capelle, F-69621 Villeurbanne, France.

Published: March 2019

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.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427497PMC
http://dx.doi.org/10.3390/ma12050830DOI Listing

Publication Analysis

Top Keywords

silica compacts
16
mechanical properties
12
silica
9
instrumented indentation
8
highly porous
8
superinsulation market
8
compacts
5
indentation super-insulating
4
super-insulating silica
4
compacts highly
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!