Thermal expansion of glasses in the solid and liquid phases

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5678181

Drotning, W D

The thermal expansion of a number of mixed oxide glasses was measured in the solid and liquid regions by gamma densitometry. Lead borate glasses were examined in the range 27 to 42 mol % PbO. The liquid phase volumetric thermal expansion coefficient was observed to decrease with increasing PbO content, in contrast to the solid phase linear thermal expansion coefficients, which displayed some increase with increasing PbO composition. At 33.3 and 42 mol % PbO, these glasses displayed crystallization behavior during cooling from the melt, depending on the cooling rate. In soda-baria phosphate glasses (50 mol % P/sub 2/O/sub 5/), liquid phase volumetric expansion coefficients were found to vary as the solid phase linear expansion coefficients. For those phosphates with Na/sub 2/O, crystallization was observed on cooling from the melt. Measurements on a lithia-aluminosilicate glass ceramic were obtained by this method to approximately 400 C above the limit of conventional dilatometry, thereby allowing the measurement of the thermal expansion of high temperature crystalline phases, as well as the liquid phase density. The gamma densitometry technique can yield density, thermal expansion, T/sub g/ and crystallization information, and quenching rate dependence data on glasses to temperatures in excess of 1500/sup 0/C, and thus provides a means for high temperature characterization of glasses which complements conventional dilatometry, calorimetry, and thermal analysis.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5678181
• Report Number(s): SAND-84-2342C; CONF-850617-1; ON: DE85013953
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
BARIUM COMPOUNDS
BARIUM PHOSPHATES
BORATES
BORON COMPOUNDS
CHALCOGENIDES
CRYSTALLIZATION
DENSITOMETERS
ELECTROMAGNETIC RADIATION
EXPANSION
GAMMA RADIATION
GLASS
IONIZING RADIATIONS
LEAD COMPOUNDS
LEAD OXIDES
LITHIUM COMPOUNDS
LITHIUM OXIDES
MEASURING INSTRUMENTS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATE GLASS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHOTOMETERS
RADIATIONS
RADIOMETRIC GAGES
SILICATES
SILICON COMPOUNDS
THERMAL EXPANSION