Tuesday, June 7, 2011

Glass and ceramic

  
Chemical compositions, properties and four types of glass














































Main components in Glass and Ceramics

Glass: silica Si02
Ceramics : made from clay, either by its self or mixed with other materials, hardened in fire






Comparisons


                  Differences


         Glass                                                  Ceramics
  • non-crystalline materials       crystalline materials
  • transparent                               opaque
  • recyclable                              non recyclable


Similarities
  • Inert to chemicals
  • brittle
  • Do not corrode


Usage of glass





Prisms







bottles

[Bottles]



reinforced plastics



constructions of buildings


spectacles





Usage of Ceramics

knife
                                         tiles



braces
                                             ball bearings





capasitor
         

                                      

Source:
www.scribd.com
Google images
































The uses of glass depend on the composition and properties as shown intable below. Type of glassPropertiesChemicalcompositionExamples of usesFuses glass
Ø
Very high meltingpoint, hence highlyheat-resistant
Ø
Transparent toultraviolet andinfrared light
Ø
Does not crack whentemperaturechangesSilicon dioxide,SiO
2
§
Telescopemirror
§
Lenses
§
Optical fibres
§
LaboratoryglasswaresSoda limeglass
Ø
Low melting point
Ø
Cracks easily withsudden temperaturechangeSilicon dioxide,sodium oxide,and calciumoxide
§
Bottles
§
Window panes
§
Light bulbs
§
MirrorBorosilicate
Ø
High melting point,thus is heat-resistant
Ø
Does not crackeasily with suddentemperature changeSilicon dioxideandboron oxide
§
Laboratoryapparatus
§
CookingutensilsLead glass
Ø
High refractive index
Ø
Reflects light raysand appears shinySilicon dioxideandlead (
II
) oxide
§
Decorativeitems
§
Lens and prism
§
Crystalglassware

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2 comments:

  1. Swee MoiNovember 24, 2011 at 5:32 AM

    Many pictures about the topic. Good. But reinforced plastics is not glass. Please correct & rearrange the layout.

    ReplyDelete
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