| THEORETICAL ASPECTS OF GLASS
MANUFACTURE |
C. Barat,
Pages : 135-153
DOI : 10.1080/0371750X.1954.10877651 |
| Abstract |
| Large bulk of fundamental research has been conducted on
glass during the last fifty years. Commercial ~;lass belongs to
the catetory of solids which are cnmmonly knorm as super-cooled
liquids where the liquid is converted into a solid for all practical
purposes, although it still retains the irregular, unsymmetrical
atomic configuration of the liquid state. All glasses when
mai11tained at a temperature just belnw their re~pectir:e liquidus
trmpe.rature fur a sufficient length of time, suffer devitrification
""d thereby lose their glassy state. In inorganic glasses elements which can accommodate atoms of some othst elements within the
nel work of their own atom1 are called network former~ e g.
silicon. Those elements which serve to modify or weaken the
network are known as network modifiers, such as B, Os,
P20 5 etc. Certain oxides, 1uch as Al.0 8 , PbO etc., have
been found to act both as network jormer1 as well as modifiers.
These are known as intermediates. Viscosity consideration of
molten glass at various temperature ranges is an important
property in glass melting a;zd fining processes. Annealing reliet•es
permanent strains from glass and makes them more resistant to
chemical attack. Low expansion glasses have a higher therma{
endurance. |
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