All heat treatment cycles consists of three basic steps.
- Heating the charge
- Holding at high temperature(Soaking)
- Controlled cooling
Soaking or holding at high temperature helps in purifying the charge and forming magnetically permeable microscopic structure. During controlled cooling this microscopic structure is fixed and increase in magnetic permeability is locked in. Depending on the soaking and cooling time the entire process typically takes about 20 to 35 hrs.
In order to produce components with desired magnetic performance PML has developed distinct heat treatment cycles for each material. These treatments are generally performed after all manufacturing/fabrication processes are completed.
PML uses pure dry Hydrogen and/or Nitrogen (as and when relevant) atmosphere furnaces in order to achieve best magnetic properties.