The early and original process can still be used as the measurement of the thermal decomposition of the ammonia process gas. This method employs the simple measurement of dissociation of the ammonia process gas.

Accurate measurement/control of process temperature and dissociation accuracy affect the “mechanics” of nitride networking, which can cause surface cracking of the compound zone. So, if the nitriding process temperature is not accurately controlled and monitored, the solubility capability of the component will increase and more nitrogen will diffuse into the surface. This increases the risk of creating nitride networking. Proper temperature control will then minimize the risk of the networking. 

Once temperature is being accurately controlled, process control should then be focused on volumetric gas flow control and nitrogen gas dilution. This should produce a formed nitrided case (shown in Fig. 8).