1416 callister rethwisch 3e heat treajng glass

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

Ask a homework question - tutors are online