Thermal Properties
Heat Capacity
Change in energy over change in temp
Heat stored by vibrations in atoms (WAVES)
Metals transmit heat through electron movement and vibration
ceramics transmit through vibration
polymers transmit through vibrations, but are really poor conductors of heat
Polymers have highest heat capacity, metals the lowest
On the graph that Alyssa loves, polymers will be the shallowest and ceramics the deepest.
if graph is symmetric, there is no radius growth
Notice that each energy crosses the function at two points. Find the average of those R values
Thermal Conductivity
Thermal conductivity is the sum of thermal conductivity through VIBRATIONS and thermal conductivity through ELECTRONS
Metals have both, so HIGHEST
Ceramics just vibrate, MIDDLE
Polymers just vibrate but shittily, so WORST
Highest crystallinity, highest K
Thermal stresses
Best if PURE
compression and stress on a material that heats up but can't expand
More crystalline, better
Linear or More CRYSTALLINE
The rise in temperature creates compression on the outside, tension inside
Cooling from outside in, so opposite
Ceramics when cooling suck ass since they are so brittle already