| Properties of Glass-Ceramics in Li20-Al20 3-Si02 (LAS)
System with Ti02 as Nucleating Agent |
T. R. SAWHNEY AND V. C. JosHI, NEELAM SINGH
Pages : 230-233
DOI : 10.1080/0371750X.1995.10804730 |
| Abstract |
| A glass composition of Li20-15, Al20 3-ll, Si02-74 wt%
doped with 16 parts of Ti02 per 100 parts of glass was
melted and heat treated at 550° and 850°C, considered to be
nucleation and crystallization temperatures respectively on the
basis of DTA of coarse and fme grains of glass. XRD (X-ray
diffraction pattern) of the glass ceramics showed the presence
of Li20.AI20 3.8Si02 and Li20.AI20 3.4Ti02 as the major crystalline
phases in it. Thermal elongation of glass ceramics
showed some discontinuity close to 300°C indicating two
ditferent types of phase assembleges contributing to elongation.
Durability and density of the glass-ceramics showed
chang~<; from 9.3 mg of H2S04 to 0.51 mg of H2S04 (consumed
during titnttinn) and from 0.01% to 1.17% respectively. |
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