THERMAL ANALYSIS OF LEAD BORATE GLASSES DURING CRYSTALLIZATION
The crystallization behavior of 2 lead borate glasses was studied by the differential thermal analysis (DTA) method, and the thermal effects were interpreted with the aid of supplementary information obtained from measurements of viscosity, thermal expansion, and microstructure. The glasses were found to nucleate readily at the air-glass interface; thus a powdered (--60 +100-mesh) sample of the glasses heated at 7.5 l C per minute in the DTA apparatus developed a large quantity of crystals, and similar heating of a bulk sample resulted in very few crystals. A third glass (solder) showed no measurable degree of crystallization despite prolonged heat treatments of fine particles. Each glass exhibited an initial endotherm during heating and a corresponding exotherm during cooling. This was attributable primarily to coalescence of the glass particles. (P.C.H.)
- Research Organization:
- Univ. of Illinois, Urbana
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-023984
- OSTI ID:
- 4707404
- Journal Information:
- Journal of the American Ceramic Society (U.S.), Journal Name: Journal of the American Ceramic Society (U.S.) Vol. Vol: 46; ISSN JACTA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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