Chap 9 glass n ceramic

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Chap 9 glass n ceramic

  1. 1. GLASS AND CERAMIC
  2. 2. LEARNING OUTCOMES     Able to list the properties of glass Able to list types of glass, their properties and uses. Able to list properties of ceramic Able to list uses of ceramic
  3. 3. GLASS 1. Glass is made from sand. 2. Main component of glass is silica. 3. Properties of glass are: a) Hard but brittle b) Chemically inert c) Not permeable to gas and liquid (fluid) d) Does not conduct electricity or heat e) Transparent
  4. 4. 4. The use of glass depends on their properties. 5. The 4 types of glass studied here are: a) Fused glass b) Soda lime glass c) Borosilicate glass d) Lead crystal glass
  5. 5. FUSED GLASS 1. Fused quartz glass is the simplest glass. 2. Main component of glass is silica. 3. Properties of fused glass: a) High purity and optical transparency b) High softening point c) Low coefficient of thermal expansion d) Chemical durability e) Difficult and expensive to produce
  6. 6. 4. Uses of fused glass: a) Laboratory glassware b) Lenses c) Telescope mirrors d) Optical fibres
  7. 7. SODA-LIME GLASS 1. Soda-lime glass is the most common glass. 2. Produced by heating silica with sodium oxide and calcium oxide. 3. Properties of soda-lime glass: a) Low softening point- easy to make into different shapes b) High thermal coefficient of expansion c) Low resistance to chemical attacks
  8. 8. 4. a) b) c) d) Uses of soda lime glass include: window panes light bulbs bottles glass containers
  9. 9. BOROSILICATE GLASS 1. Borosilicate glass is formed when boron oxide is added to soda-lime glass. 2. Was first developed by German glassmaker Otto Schott in the late 19th century. 3. Properties of borosilicate glass: a) Very low thermal expansion coefficient b) High softening point c) Resistant to thermal shock d) Chemically resistant Otto Schott in 1890
  10. 10. 4. Uses of borosilicate glass: a) Laboratory glassware such as beakers, boiling tubes, flasks etc. b) Cookware c) Glass containers
  11. 11. LEAD GLASS 1. Commonly known as lead crystal. 2. Made by using lead oxide and potassium oxide. 3. Lead glass has a high refractive index and a relatively soft surface that is easy to grind, cut and engrave. 4. Properties of lead glass are: a) High refractive index b) High density c) Attractive glittery/shiny appearance
  12. 12. 5. Uses of lead glass include a) prisms b) decorative objects such as decanters and chandeliers.
  13. 13. CERAMIC
  14. 14. CERAMIC 1. Ceramic is made from clay. 2. Main component of clay is aluminosilicate. 3. Properties of ceramics are: a) Very hard and strong but brittle b) Chemically inert c) Has very high melting point d) Heat and electrical insulators e) Opaque and porous
  15. 15. 4. Ceramics are used in many areas such as: a) Construction materials, e.g. bricks, roof tiles, sinks and toilet bowls. b) Decorative items, e.g pottery, plates, cups and vases and wall tiles c) Electrical insulators, e.g. insulators for toasters, refrigerators and electric plugs. d) Medical field, e.g. dentures and prosthetic limbs. 5. Ceramics can also be improved to new composite materials such as superconducters.
  16. 16. SIMILARITIES BETWEEN GLASS AND CERAMIC 1. 2. 3. 4. 5. Hard but brittle Good electrical and heat insulator Do not corrode Resistant to chemical attacks Can withstand compression
  17. 17. DIFFERENCES BETWEEN GLASS AND CERAMIC CERAMIC GLASS 1.Transparent 1. 2.Can 2. be melted and remoulded 3.Does not have a melting point 3. Opaque Cannot be melted and remoulded Have very high melting point

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