INVESTIGADORES
RENDTORFF BIRRER Nicolas Maximiliano
artículos
Título:
Evaluation of Non Crystalline Phase in AZS Refractories by XRD Methods
Autor/es:
CONCONI SUSANA; N. RENDTORFF; AGLIETTI ESTEBAN
Revista:
New Journal of Glass and Ceramics
Editorial:
Scientific Research
Referencias:
Año: 2011 vol. 2 p. 21 - 25
ISSN:
2161-7554
Resumen:
The relation between the atomic structure and the macroscopic properties and behaviors of a material constitute one of
the objectives of the materials science, particularly in the design and development of ceramic materials. Crystalline and
non crystalline phases together with pores, grain boundaries, etc. affect mechanical and fracture prop-erties as well as
chemical resistance and electric properties. These aspects will be bonded to the raw materials chosen and the whole
processing route. In glass industry, although there are other electrofused refractories such as the alumina ones used in
the feeding of the fusion kilns, probably the most used refractories in contact with the melted glass are electrofused materials
that belong to the Al2O3-SiO2-ZrO2 system commonly named AZS. Exceptionally for refractory materials the
amount of the glassy phase in a AZS material is important and appreciable; and makes them particularly adequate for
containing fussed glass. The glass proportion will define much of their prop-erties and behaviors. In the present work
the results of the non crystalline phase quantification of two samples of commercial AZS materials are presented and
compared. These were obtained by three different methods using in the X ray powder diffraction (XRD) techniques. The
first method consists in the linear interpolation of the base lines of the diffractograms compared to the amorphous silica
and the fully crystalline quartz. The other two methods are based in the application of the Rietveld method. One is the
internal standard method with quartz as fully crystalline standard and the other one consist in the inclusion of the
glassy phase to the refinement with a structural model that can be understood as the widening of the peaks consequence
of an extreme decrease in the crystallite size of a quartz phase. The three methods showed equivalent results (with differences
less than 3%) for the two samples and demonstrated that are adequate for the quantification of the non crystalline
phase in this kind of materials.