Record number :
2149716
Title of article :
Thermal behavior of GeO2 doped PbO–B2O3–ZnO–Bi2O3 glasses
Author/Authors :
Cheng، نويسنده , , Yin and Xiao، نويسنده , , Hanning and Guo، نويسنده , , Weiming and Guo، نويسنده , , Wenming، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
5
From page :
184
To page :
188
Abstract :
PbO–B2O3–ZnO–Bi2O3 glass is a representative system for vacuum and electronic sealing. Effects of GeO2 on thermal properties of the glass have been investigated in this paper. Activation energy for crystallization, glass structure, the type of crystals were characterized by differential scanning calorimetry, infrared spectroscopy, X-ray diffraction and optical microscopy. Results indicate that the addition of GeO2 (0.4–2 wt.%) to PbO–B2O3–ZnO–Bi2O3 glass can suppress crystallization of the glass and decrease the sealing temperature. With the increase of GeO2 content, germanate crystals were revealed, resulting in a slight increase of sealing temperature. When the content of GeO2 is 0.7 wt.%, the glass possesses the highest stability and lowest sealing temperature (400 °C), which is desirable for low-temperature sealing. The coefficient of thermal expansion of PbO–B2O3–ZnO–Bi2O3 glass was measured by dilatometry. The result shows that the coefficient of thermal expansion of the glass increases with the content of GeO2. The adjustability of the coefficient of thermal expansion would expand the applications of PbO–B2O3–ZnO–Bi2O3 glass. A flexural strength of 28.3 MPa was obtained at the GeO2 content of 0.7 wt.%, showing good mechanical property for sealing process.
Keywords :
Germanium oxide , Flexural Strength , thermal behavior , Sealing glass , crystallization
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2006
Link To Document :
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