Electron scanning microscope picture in false colours.
This is the result of a vibration test on a burning tungsten coil in a lamp.
Due to the temperature, movement at some specific point and probably a cavitation effect in the grain boundaries the metal is pushed away from its normal place and build this kind of needle structure.
The largest needle is 40µm high![=D]( "=D (Big Grin)")
![thumbnail]()
This is the result of a vibration test on a burning tungsten coil in a lamp.
Due to the temperature, movement at some specific point and probably a cavitation effect in the grain boundaries the metal is pushed away from its normal place and build this kind of needle structure.
The largest needle is 40µm high
