Preparation of Fe-Based Bulk Amorphous Materials and Its Application to Sensors

【Author】

Sun Xiaohua, Wu Jinbin, Zhao Zengqi, Zhao Jun, Sun Guangjie,Liu Changsheng (School of Materials & Metallurgy, Northeastern University,Shenyang 110004, China;Baotou Rare Earth Research Institute,Baotou 014010,China)

【Abstract】

<正> The study of recent years found that big bulk amorphous alloys were formed for some multi-element compositions at rapid cooling speed such as Zr-, La-, Fe-, Mg-based alloys with wide undercooled liquid phase field and high trend of forming glass. (△Tx=crystallization temperature Tx - glass transformation temperature Tg) Bulk amorphous Fe-(Al, Ga)- (P, C, B, Si) based alloys with thickness of 3-5 mm and diameter of φ2 mm-6 mm were prepared by copper mold upper suction casting with minus pressure while some new technical processes and adding new elements such as Co, Nb, Ca, etc. were used to improve magnetic properties and other performances of the materials. The results show that Fe-based bulk amorphous alloys have low coercive force and high permeability, which are successfully applied to magnetoelectric sensors with temperature ranges between -45 t and 150 t by special design of magnetic circuits.

【Keywords】

bulk amorphous; glass transformation ability; suction casting of minus pressure; sensor

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