Radiation and temperature stability of ferrites with rectangular hysteresis characteristics

Abstract

1. Metallic low coercive force materials with rectangular hysteresis characteristics are less stable to radiation than ferrites. 2. Irradiation of grade 50NP and 79NM alloys with an integrated flux of the order of 1018 neutrons/cm2 produces appreciable changes in the magnetic saturation and coercive force. 3. Irradiation of ferrite cores made from grade N-44 and grade N-85 ferrites with an integrated flux of 1018 neutrons/cm2 does not result in any observable changes in properties. 4. The normal working temperatures for grade N-44 and grade N-85 ferrite cores are 70–80 and 60–70° respectively. 5. The effect of the self-heating temperature of the ferrite cores depends on the magnitude of the magnetic induction and the remagnetization frequency. 6. The method developed for determining the core self-heating temperature under high frequency remagnetization conditions is an improvement on the indirect method.