Glass 2013011443 Hyun-Kyung Kim 2013011448 Ji-Young Moon Material Science Associate Professor Su-Jin Kim 2013011443 Hyun-Kyung Kim 2013011448 Ji-Young Moon 2013011481 Hye-Bin Lee School of Mechanical Engineering Gyeongsang National University Glass is a transparent or translucent material. It is a non crystalline or amorphous substance. Glass acquires solid state appearance because of increase in viscosity on rapid cooling. So Glass is described as super cool liquid. -manufacture of glass 3 steps : fusion of raw materials , working with molten mass , anneling. Soda ash(naco2) , limestone(ca2co3) , sand(sio2) Powder called batch ==== Cullet helps in lowering the melting temperature of the raw materials. The hall mass is heated to 1000degree center grade in a furnice The following chemicals reaction takes place in gives grace in a liquid stage. impurity called glass gall rises surface and are removed. At this stage salts are added to get colored glass Working with molten mass The fused mass obtain the above step is allowed cool the still maintain the liquid stage. The liquid glass is poured in the molt over required shapes. Annealing Usually glass obtain by rapid cooling is brittle. So glass is passed through a high temperature stone Then in low temperatures own. In a long narrow chamber by conveyor belt Well cool slowly giving transparent glass. This process called annealing.

Selected material Glass

Contents How to make Glass Properties of Glass Use of Glass Q & A

How to make Glass

Properties of Materials Greater resistance to corrosion Fragile Non-conductive Transparent Low heat transfer rate Greater resistence to corrosion Low heat transfer rate Non-conductive Transparent Fragile

Types and Uses of Glasses Soda glass Soft glass Pyrex glass Quartz glass Flint glass Hard glass Borosilicate glass

Q & A Are there any questions? I think we’re out of time, but if anyone has any questions, please come talk to me after the meeting.

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