NDLI: Containerless processing of a lithium disilicate glass

Content Provider	Springer Nature Link
Author	Ranasinghe, K. S. Ray, C. S. Day, D. E. Rogers, J. R. Hyers, R. W. Rathz, T.
Copyright Year	2007
Abstract	Glasses of Li$_{2}$O · 2SiO$_{2}$ (LS$_{2}$), and LS$_{2}$ doped with 0.001 wt% platinum (LS$_{2}$ + 0.001 wt% Pt) compositions were melted, cooled and reheated at controlled rates while levitated (containerless) inside an electrostatic levitator (ESL) furnace at the NASA Marshall Space Flight Center. The experiments were conducted in vacuum using spherical, 2.5–3 mm diameter, glass samples. The measured critical cooling rate for glass formation, R $_{c}$, for the LS$_{2}$ and LS$_{2}$ + 0.001 wt% Pt glasses processed at ESL were 14 ± 2 °C/min and 130 ± 5 °C/min, respectively. The values of R $_{c}$ for the same LS$_{2}$ and LS$_{2}$ + 0.001 wt% Pt glasses processed in a container were 62 ± 3 °C/min and 162 ± 5 °C/min, respectively. The effective activation energy for crystallization, E, for this LS$_{2}$ glass processed without a container at ESL, was higher than that for an identical glass processed in a container. These results suggest that the glass formation tendency for a containerless LS$_{2}$ melt is significantly increased compared to an identical melt in contact with a container. The absence of heterogeneous nucleation sites that are inherently present in all melts held in containers is believed to be the reason for the increased glass forming tendency of this containerless melt.
Starting Page	4291
Ending Page	4297
Page Count	7
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	42
Issue Number	12
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-02-28
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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