ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
A formulation belonging to the CaO-MgO-SiO2-Al2O3 system was characterized in order tofound a monophase system based on indialite (Mg2Al4Si5O18), known for its good mechanicalcharacteristics. The classical kinetic studies performed in the muffle kiln show an initial surfacecrystallization followed from immediate bulk crystallization. The kinetic results obtained viadifferential scanning calorimetry (DSC) were treated with isothermal method, Kissinger, Ozawaand Matusita and Sakka approaches and compared. These results partially explain themacroscopic behavior, because the studies performed on sample of different grain size show atypical trend for a surface crystallization, while the value of Avrami parameter calculated fromthe kinetics is 2.3, demonstrating a bi-dimensional crystallization. The value of crystallizationenergy EC calculated with the isothermal method is 517.8 kJmol-1 and the comparison with nonisothermalstudies suggests bulk crystallization to occur with an increasing number of nuclei anda two-dimensional growth of crystals
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.25.pdf
Permalink