Crystallization and properties of Sr-Ba aluminosilicate glass-ceramic matrices

Conference · Thu Aug 01 04:00:00 EDT 1991 · Ceramic Engineering and Science Proceedings; (United States)

OSTI ID:6110483

Bansal, N P; Hyatt, M J; Drummond, III, C H

Powders of roller quenched (Sr,Ba)O-Al2O3-2SiO2 glasses of various compositions were uniaxially pressed into bars and hot isostatically pressed at 1350 C for 4 hours or cold isostatically pressed and sintered at different temperatures between 800 to 1500 C for 10 or 20 hours. Densities, flexural strengths, and linear thermal expansion were measured for three compositions. The glass transition and crystallization temperatures were determined by Differential Scanning Calorimetry (DSC). The liquidus and crystallization temperature from the melt were measured using high temperature Differential Thermal Analysis (DTA). Crystalline phases formed on heat treatment of the glasses were identified by powder X ray diffraction. In Sr containing glasses, the monoclinic celsian phase always crystallized at temperatures above 1000 C. At lower temperatures, the hexagonal analog formed. The temperature for orthorhombic to hexagonal structural transformation increased monotonically with SrO content, from 327 C for BaO-Al2O3-2SiO2 to 758 C for SrO-Al2O3-2SiO2. These glass powders can be sintered to almost full densities and monoclinic celsian phase at a relatively low temperature of 1100 C. 9 refs.

• OSTI ID: 6110483
• Report Number(s): CONF-910162--
• Conference Information: Journal Name: Ceramic Engineering and Science Proceedings; (United States) Journal Volume: 12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CERAMICS
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
CRYSTALLIZATION
DENSITY
DIFFRACTION
EXPANSION
FABRICATION
FLEXURAL STRENGTH
GLASS
HEAT TREATMENTS
HIGH TEMPERATURE
HOT PRESSING
LOW TEMPERATURE
MATERIALS WORKING
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POWDERS
PRESSING
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
THERMAL ANALYSIS
THERMAL EXPANSION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
X-RAY DIFFRACTION