Ceramics and Glass Flashcards
What are ceramics?
Heated up clay
Ceramics vs Glass (similarites)
Both are inorganic, nonmetallic solids
Both are held held in ionic and covalent bonds.
Ceramics vs Glass (Differences)
Ceramic’s crystallinity varies from crystalline to semi crystalline to amorphous.
Glass has NO crystallinity i.e. it is amorphous or considered a frozen liquid.
Properties of Ceramics
Brittle, High melting Point, Poor conductor, Chemically resistant, waterproof
Early Forms of Ceramics
Earthenware, Stoneware, Bone China
Technical Ceramics
Oxides - quartz (siO2) , alumina(Al2O3), Ceria
Nonoxides - Carbide(siC), Nitride (Si2N4)
Functional Ceramics
Functional Ceramics
Electroactive, Thermoelectric, Magnetic Ceramics piezoelectric Ceramics
Piezzoelectric Ceramics
Materials that can convert energy from one form to another
Glass Chemical Forms
Oxides, Borides, Polymers, Metals.
MOST COMMON IS SIO2
Early Forms of Glass
Obsidian - Volcanic Glass, used for spearpoints
Fulgurites
Network Modifiers
Materials added to glass to significanty lower melting point like Lime (CaO) or Natron
Roman Glass
Made clear glass by adding MnO2 to glass
Made first windows, mirrors
Float Glass
Used a layer of molten Tin below heated glass to help make flat and shaped glass for windows. Makes glass quickly with little to no polishing needed
Why is the Rupert Drop so strong?
The exterior of the drop is in a state of compression and glass is strong in compression.
How did ancient people enable glass to be melted and manipulated?
They added natron to the sand to lower the melting point.
