Supervisors info:
ΜΙΧΑΗΛ ΣΤΑΜΑΤΑΚΗΣ, ΚΑΘΗΓΗΤΗΣ, ΤΜΗΜΑ ΓΕΩΛΟΓΙΑΣ ΚΑΙ ΓΕΩΠΕΡΙΒΑΛΛΟΝΤΟΣ, ΕΘΝΙΚΟ ΚΑΙ ΚΑΠΟΔΙΣΤΡΙΑΚΟ ΠΑΝΕΠΙΣΤΗΜΙΟ ΑΘΗΝΩΝ
Summary:
This study aims to determine the thermal behavior of the minerals Brucite, Dawsonite and the mixture of Huntite-Hydromagnesite, in order to investigate their possible use as fire retardant fillers. The Brucite sample has been received from Russia (AGROMAG), the Dawsonite sample from Albania and the mixture of Huntite-Hydromagnesite from Kozani, Greece (SIBELCO). The identification of the mineral phases, the composition and the morphology of the test materials, were conducted by the X-Ray Diffraction method (X.R.D.) and Scanning electron Microscopy (S.E.M.). Afterwards, the thermal decomposition of each sample was determined by Thermogravimetric Analysis (TGA), Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC). The thermal analysis took place under He, Ar and N2 atmosphere and heating rate of 20 °C/min, 10 °C/min και 10 °C/min, respectively. The results were evaluated according to the bibliography and compared both to each other and to the widely used fire retardant filler ATH (Al(OH)3). In conclusion, of the three materials studied, Dawsonite showed properties comparable to those of ATH, as its decomposition temperature is very close to the decomposition temperature of ATH, compared to the other two materials studied. Moreover, it is proposed that the mixture of Huntite-Hydromagnesite is enriched by Hydromagnesite, in order to replace the use of ATH as a fire-retardant filler, since it can cover a wider temperature range. Finally, it is proposed that Brucite can be used as a fire-retardant filler in materials processed at higher temperatures than those where ATH is used.
Keywords:
Fire-retardants, Huntite, Hydromagnesite, Brucite, Dawsonite
