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microCAD 2004. Investigation of parameters influence on optical properties of silicon glasses. Paróczai Csilla 1 , Dr Gömze A. László 2 undergraduate, senior lecturer University of Miskolc, Department of Ceramic and Silicate Engineering. Goals. Our goal is reduce the number of these defects - PowerPoint PPT Presentation
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Investigation of parameters influence on optical properties
of silicon glasses
Paróczai Csilla1, Dr Gömze A. László2
undergraduate, senior lecturer
University of Miskolc, Department of Ceramic and Silicate
Engineering
microCAD 2004
Goals
• Our goal is reduce the number of these defects
• The quick and exact determination of the defects
Glass
• Amorf• Phisically homogeneous• Raw materials
• Quarts sand SiO2
• Limestone CaCO3
• Dolomit CaCO3*MgCO3
• Feldspar R2O*Al2O3*SiO2
• Alumina Al2O3
• Soda Na2CO3
• Natrium-szulfat Na2SO4
• Coke• Cullet
Glass defects
• Glassy unhomogeniticy
(cord, knot)
• Crystal or opaque bubble
(stone, metal, crystal)
• Air bubble
(blister, bubble)
• Cranny
Cause of the defects
• Inadequate rawmaterial
• Inadequate melting parameters
• Substantial evaporation
• Irregularity in the flowing glass
• Contact of glass with the wall of the furnace
Methods are adopted to identify stones in glass.
• Visual or magnifier observation
• Methods using an electron-ray probe micro analyzer
• Identification by chemical analysis
• Identification by spectro analysis
SiO2 stones in the glass
• Cause:– Cristallization– The silica brick corrodes and refractory
material get into the glass– Unmelted quarts sand in the melting
Experiment Method
• Identification by polarization microscope
• When defect is reduced by glass, it loses O2. Thus this
O2 meets
with carbon and CO2
formes
Identification by EDX-microanalyses
• Electron microprobe X-ray analyzer Jeol Superprobe 733
• Thin carbon film • High vacuum • We examined two
different zone of glass which are the metallic silica and the surrounding glass.
Measurements and results
• This zone contains metallic pollutant such as Fe, Ti, Mn, Cu.
• Probably the cause of this defect is the polluted basic material.
• These defects could be reduced by using metal detector.
• 1. Zone
Measurements and results
• Pure glass can be seen because the examined material contained only Si
•2. zone
Conclusion
• It is important to particle daily training for the eye to distinguish characteristics and optical properties peculiar to each kind of stone minerals may lead to the implementation of irrelevant countermeasures, and it is therefore essential to correctly identify stone minerals and of surmising the causes of their occurrence.