Effect of heat treatment on the properties of amorphous ribbons in acoustic magnetic tags

Abstract

Taking Fe–Ni–Co amorphous ribbons in acoustic magnetic tags as research object, the microstructure, composition and crystallization temperature of amorphous ribbons were analyzed by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The manufacturing process and parameters (annealing temperature, tension and speed) of amorphous ribbons were systematically regulated and analyzed, including the influence on soft magnetic properties of amorphous ribbons by molding process. It indicates that non-magnetic annealing temperature (Ta) remains unchanged, the first magnetic annealing temperature (Tma1) is relatively higher, while second annealing temperature (Tma2), tension and speed are comparatively lower, amorphous ribbons emerge strong sensitivity and high reliability of soft magnetic properties. Meanwhile, combined with the actual experiment and orthogonal test analogy results, the best molding process parameters of amorphous ribbons are obtained: Ta, Tma1 and Tma2 are 375 °C, 315 °C and 255 °C respectively, tension is 8 N and speed is 4 m/min. In addition, the response demonstration of process is carried out under the condition that bias field value is 318.31 A/m and 366.06 A/m. The resonance frequencies of amorphous ribbons are 59.15 kHz and 58.55 kHz respectively, alongside a maximum vibration amplitude is 81, with the weakest and strongest response distance between transmitter and receiver are measured to be 150 cm and 160 cm, which are in line with the actual production process, indicating that the manufacturing process can be optimized to improve the production efficiency and service characteristics of acoustic magnetic tags.