What Does Curie Point Mean?
A Curie point is the temperature at which magnetic materials lose their magnetic properties. This phenomena is also known as superconductivity. Curie point is named after Pierre Curie, who was a French physicist who discovered this phenomena in 1895. At low temperatures, the magnetic dipoles are aligned but when heated to the Curie point, the dipoles are nudged out of alignment.
Trenchlesspedia Explains Curie Point
Steel and iron pipes possess magnetic properties because of the presence of iron in them when they are below the Curie point. When heated to the Curie point they lose their magnetic properties because the alignment is disturbed. According to Curie's law the relation between a substance magnetization and the temperature can be given as:
M = (CxB) / T
where M - magentization
B - magnetic field (Tesla)
T - absolute temperature (Kelvin)
C - Curie constant depending on the material
The concept of Curie point is used in thermo-magnetic motors in which the material is heated above its Curie point and allowed to cool down. It's also used to study minerals in geology where it refers to the temperature at which a magnetic mineral crystal loses its magnetic polarity.