Abstract
In this work, it is shown how the additions of vitreous silica of particle size <100 mesh may influence the reversible thermal expansion behavior of a particular mix of alfaquartz particles of different size distribution. It was found that the addition of 30 ≈ 35 vol% of vitreous silica can be considered as a percolation threshold mass-volume fraction limit, which is enough to eliminate totally the characteristic thermal expansion behavior of quartz in the range from room temperature to 1100˚C.
Highlights
Because of the polymorphism related to the alfa/beta phase transitions of crystalline quartz, tridimite and cristobalite, either during heating up or cooling down, an overall peculiar thermal expansion behavior is presented by silica
It was found that the addition of 30 ≈ 35 vol% of vitreous silica can be considered as a percolation threshold mass-volume fraction limit, which is enough to eliminate totally the characteristic thermal expansion behavior of quartz in the range from room temperature to 1100 ̊C
Our interest in the present study is to investigate in a simple manner, if there is a volumetric fraction of vitreous silica addition to a mixture of differently sized quartz particles, at which the behavior of the reversible linear thermal expansion of the original system, drastically changes
Summary
Because of the polymorphism related to the alfa/beta phase transitions of crystalline quartz, tridimite and cristobalite, either during heating up or cooling down, an overall peculiar thermal expansion behavior is presented by silica. It is shown how the additions of vitreous silica of particle size
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