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研究了处于永磁体强磁场中Mn1.2Fe0.8P1-xSix系列化合物的热磁发电性能,采用高性能球磨和固相烧结合成方法制备了Mn1.2Fe0.8P1-xSix系列化合物,并对该系列化合物的物相结构、磁性和热磁发电性能进行了测量.结果表明:Mn1.2Fe0.8P0.37Si0.63和Mn1.2Fe0.8P0.35Si0.65化合物是具有Fe2P型六角结构的一级相变软磁性材料,两者居里温度分别为334 K和348 K,处于工业余热温区.根据一级相变磁性材料在居里温度磁化强度发生突变这一特性,研制热磁发电演示装置,测量了Mn1.2Fe0.8P0.37Si0.63和Mn1.2Fe0.8P0.35Si0.65这两种材料铁磁相变产生感应电流大小与线圈匝数、热磁发电材料质量、表面积、表面上温度梯度的关系.研究结果表明,Mn1.2Fe0.8P1-xSix系列化合物具有很好的热磁发电性能,有望成为热磁发电候选材料.
The thermomagnetic properties of Mn1.2Fe0.8P1-xSix series compounds in a strong magnetic field of permanent magnet were investigated. Mn1.2Fe0.8P1-xSix compounds were prepared by high-performance ball milling and solid-phase sintering. The compounds Phase structure, magnetic properties and thermomagnetic power generation performance were measured.The results show that: Mn1.2Fe0.8P0.37Si0.63 and Mn1.2Fe0.8P0.35Si0.65 compounds are Fe2P type hexagonal structure of the first-order phase transition soft Magnetic materials, Curie temperature of the two were 334 K and 348 K, respectively, in the industrial heat temperature zone.According to the characteristics of first-order phase change magnetic material in the Curie temperature magnetization mutation occurs, the development of thermal magnetic power generation demonstration device, measured The relationship between the induced current and the number of turns, the mass of thermomagnetic materials, the surface area and the temperature gradient on the surface of Mn1.2Fe0.8P0.37Si0.63 and Mn1.2Fe0.8P0.35Si0.65 ferromagnetic phase transitions The results show that Mn1.2Fe0.8P1-xSix series compounds have good thermomagnetic power generation performance and are expected to be candidates for thermomagnetic power generation.