Physics For Civil Engineering: Unit IV: New Engineering Materials
Thermal Properties of ceramic materials
Since the ceramic materials contain relatively few electrons, their thermal properties differ from that of metals. The most important thermal properties of ceramic materials are
THERMAL PROPERTIES
Since
the ceramic materials contain relatively few electrons, their thermal
properties differ from that of metals. The most important thermal properties of
ceramic materials are
(i)
Thermal capacity
(ii)
Thermal conductivity
(iii)
Thermal Shock
(i) Thermal capacity
• The specific heats of fine clay bricks
are 0.25 at 1000°C and 0.297 at 1400°C.
•
Carbon bricks possess specific heats of about 0.812 at 200°C and 0.412 at
1000°C.
(ii) Thermal conductivity
• The ceramic materials possess a very low thermal conductivity
since they do not have enough free electrons.
• The impurity content, porosity and
temperature decrease the thermal conductivity.
•
The ceramic materials possess low thermal conductivity sliaus due to its low
density.
(iii) Thermal Shock
"Thermal shock resistance" is the
ability of a material to resist cracking or disintegration of the material
under sudden changes in temperature.
• Lithium compounds are added in many
compounds to reduce thermal expansion and provide excellent thermal shock
resistance.
Physics For Civil Engineering: Unit IV: New Engineering Materials : Tag: : - Thermal Properties of ceramic materials
Physics For Civil Engineering: Unit IV: New Engineering Materials
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Physics for Civil Engineering
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