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Mechanical Properties of Silica Xerogels
Author(s) -
Abramoff Bennett,
Klein Lisa C.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb04134.x
Subject(s) - outgassing , microporous material , porosity , materials science , composite material , mineralogy , mechanical strength , chemistry , organic chemistry
Strengths have been measured for silica xerogels using four‐point bending. The silica xerogels studied are microporous with open porosity of 53 vol%. Strengths were measured on fresh samples, samples which had been outgassed at 250°C, samples which were exposed to ambient conditions for 2 d, and samples stored in ethanol. Fresh samples had strengths about 20 MPa which increased to 32 MPA with outgassing but returned to 20 MPa after exposure. The loss of strength could be arrested, but not reversed, by storing the samples in ethanol.