GAS CARBONITRIDING PROCESS FOR 2.5% Si-Fe MATERIAL
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Armatures and cores made from 2.5% Si-Fe material require a hardened case to provide wear resistance. Prior to case hardening the parts normally go through a vacuum annealing process to relieve the cold work and improve the magnetic properties. During the vacuum annealing process, the surface of the armatures becomes passive with a complex structure of silicon, oxygen and nitrogen. It is therefore necessary to activate the surface so that the armatures can respond to the gas carbonitriding process for case hardening.