Effect of dopants and heating temperatures on demagnetization and curie point of thermomagnetic powder materials based on iron-nickel alloys

Abstract

In this research, the influence of Ti and Cr additives on the demagnetization temperature and the Curie point of powder TMM was determined by estimating the force of detachment of its sample from a permanent magnet. The dependency of changes of tractive characteristics in the heating conditions was illustrated every 10 °С by measuring tractive characteristics of the thermomagnetic element with gradual heating from 25 to 180 °С. It was established that the material 63% (mass.) Fe―33% (mass.) Ni―4% (mass.) Ti (sintering temperature 1350 °C) has the best thermomagnetic properties within the temperature range of 20―150 °C, which is close to the standard of 33H2X alloy obtained by the method of melting and rolling.