Ceramic materials classification and properties
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Ceramic materials are inorganic, non-metallic materials made from compounds of a metal and a non metal. Ceramic materials may be crystalline or partly crystalline. They are formed by the action of heat and subsequent cooling.
Properties of Ceramics:
1)Extreme hardness
– High wear resistance
– Extreme hardness can reduce wear caused by friction
2)Corrosion resistance
3)Heat resistance
– Low electrical conductivity
– Low thermal conductivity
– Low thermal expansion
– Poor thermal shock resistance
4)Low ductility
– Very brittle
– High elastic modulus
5)Low toughness
– Low fracture toughness
– Indicates the ability of a crack or flaw to produce a catastrophic failure
6)Low density
– Porosity affects properties
7)High strength at elevated temperatures
Properties of Ceramics:
1)Extreme hardness
– High wear resistance
– Extreme hardness can reduce wear caused by friction
2)Corrosion resistance
3)Heat resistance
– Low electrical conductivity
– Low thermal conductivity
– Low thermal expansion
– Poor thermal shock resistance
4)Low ductility
– Very brittle
– High elastic modulus
5)Low toughness
– Low fracture toughness
– Indicates the ability of a crack or flaw to produce a catastrophic failure
6)Low density
– Porosity affects properties
7)High strength at elevated temperatures
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