1416 callister rethwisch 3e heat treajng glass

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Unformatted text preview: ng –  sheets are formed by floaJng the molten glass on a pool of molten Jn Adapted from Fig. 14.19, Callister & Rethwisch 3e. www.youtube.com/watch?v=PSurxsGQL90 Glass Structure • Basic Unit: 4- Si04 tetrahedron Si 4+ O • Quartz is crystalline SiO2: 2- Glass is noncrystalline (amorphous) • Fused silica is SiO2 to which no impuriJes have been added • Other common glasses contain impurity ions such as Na+, Ca2+, Al3+, and B3+ Na + Si 4+ O 2- (soda glass) Adapted from Fig. 3.41, Callister & Rethwisch 3e. Glass ProperJes Specific volume (1/ρ) vs Temperature (T): Crystalline materials Specific volume Liquid (disordered) Supercooled Liquid Glasses Glass (amorphous solid) - - do not crystallize Crystalline (i.e., ordered) Tg - - crystallize at melJng temp, Tm - - have abrupt change in spec....
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This note was uploaded on 01/16/2014 for the course EMA 3010 taught by Professor Unknown during the Fall '08 term at University of Florida.

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