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Effect Of SnO2 on the Mechanical Properties of SiO2/SnO2 Gel-Derived Composites

Published online by Cambridge University Press:  28 February 2011

R. Dal Maschio ,
S. Dire ,
R. Campostrini ,
G.D. Soraru  and
G. Carturan
R. Dal Maschio
Affiliation:
Dipartinento di Ingegneria dei Materiali, University of Trento, 38050 Mesiano, Trento, Italy.
S. Dire
Affiliation:
Dipartinento di Ingegneria dei Materiali, University of Trento, 38050 Mesiano, Trento, Italy.
R. Campostrini
Affiliation:
Dipartinento di Ingegneria dei Materiali, University of Trento, 38050 Mesiano, Trento, Italy.
G.D. Soraru
Affiliation:
Dipartinento di Ingegneria dei Materiali, University of Trento, 38050 Mesiano, Trento, Italy.
G. Carturan
Affiliation:
Dipartinento di Ingegneria dei Materiali, University of Trento, 38050 Mesiano, Trento, Italy.
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Abstract

The morphological evolution and SnO2 crystallization of various gel-derived materials, composed of SiO2-SnO2 in the range from 34 to 5 wt % SnO2, are studied in function of the thermal treatment in the interval 200-800°C. SnO2 phase separation occurring above 400°C affects the density, the apparent porosity and mechanical properties like hardness and Young's modulus. At the lowest SnO2% a continuous density increase is observed on heating at variance with high tin dioxide contents for which the apparent density is almost constant. The results are discussed on the basis of SnO2 crystallization, which occurs by two different mechanisms, evidenciated by X-ray analyses. The data will be compared with those of pure SiO2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 351
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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