Northern Kentucky University
Enhancing Grain Size and Uniformity of Ferrite Magnets for Magneto-Elastic Pressure Sensor Applications
Institution
Northern Kentucky University
Faculty Advisor/ Mentor
Chari Ramkumar
Abstract
The objective of this research was to develop a toroid composed of a ferrite material that has the same grain structure and uniformity as a commercially manufactured toroid. A zinc, manganese, and iron mix [(MnZn)xFe3-xO4] was used for the ferrite material and was sieved using a 20 micron sieve in order to maintain uniform particle size. The calcination process was varied with the best results coming from a 45 minute rise to 1200 °C, holding at this temperature for 120 minutes and cooling down to room temperature in 720 minutes. We used 1% PVA binder and 1200 pounds of pressure for 15 minutes using a hydraulic press to make all of the toroids. A process of 120 minutes rise to 1200 °C, holding at this temperature for 180 minutes and then cooling down to room temperature in 720 minutes was used to sinter all these toroids to increase the size and uniformity of grains. Scanning electron microscope studies reveal that one of the toroids has developed grain structure that is very close to commercially manufactured toroid.
Enhancing Grain Size and Uniformity of Ferrite Magnets for Magneto-Elastic Pressure Sensor Applications
The objective of this research was to develop a toroid composed of a ferrite material that has the same grain structure and uniformity as a commercially manufactured toroid. A zinc, manganese, and iron mix [(MnZn)xFe3-xO4] was used for the ferrite material and was sieved using a 20 micron sieve in order to maintain uniform particle size. The calcination process was varied with the best results coming from a 45 minute rise to 1200 °C, holding at this temperature for 120 minutes and cooling down to room temperature in 720 minutes. We used 1% PVA binder and 1200 pounds of pressure for 15 minutes using a hydraulic press to make all of the toroids. A process of 120 minutes rise to 1200 °C, holding at this temperature for 180 minutes and then cooling down to room temperature in 720 minutes was used to sinter all these toroids to increase the size and uniformity of grains. Scanning electron microscope studies reveal that one of the toroids has developed grain structure that is very close to commercially manufactured toroid.