Ferroferric Oxide /micro Silicon Powder Preparation And Properties Of Composite Materials

In this paper, ferroferric oxide and ferroferric oxide /micro silicon powder composite materials were prepared by means of co-precipitation method. Based on modern analysis tools, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), the infrared absorption spectrometry (IR), and vibration magnetizing strength test (VSM) , characterizing the samples, studying the magnetic feature of materials, the effects and emitting mechanism of ferroferric oxide and fferroferric oxide /micro silicon powder composites issued by various reaction conditions, it provides a new way of composite materials for the preparation of practical, low-cost, high performance Fe³⁺ and ferroferric oxide /micro silicon powder.In the first part of this paper, it explores the Moore ratio of Fe²⁺ / infer Fe³⁺and reaction temperature range for experimental conditions by single factor experiment firstly. Then, by means of orthogonal experiment and the optimal selecting principles, the most appropriate reaction conditions were selected ,involving the optimum Fe²⁺ / Fe³⁺ molar ratios for 1:2; The optimal reaction temperature for 60℃; The optimal reaction time for 2 hours; Sodium hydroxide optimal adding amount of substance 0.1 mol. Performance characterization analysis, the ferroferric oxide powder was confirmed, and through three magnetic strength test (vibration VSM) mapping, the magnetized intensity of ferroferric oxide (Ms = 65.86 emu/g) was obtained.In the second part of this paper, by using two kinds of method, ferroferric oxide /micro silicon powder composite materials was prepared. Method 1, based on trivalent iron of micro silicon powder, by adding different quality bivalent iron, provides the preparation for ferroferric oxide /micro silicon powder composite materials. According to the method, achieving maximum magnetic strength (3.5849 emu/g) of Fe3O4/SiO2 magnetic composite particle, it was as 102.2 times as the magnetic strength of average micro silicon powder. Method 2, taking micro silicon powder as the kernel, by adding Fe²⁺ Fe³⁺ to generate ferroferric oxide, provides the preparation for ferroferric oxide/micro silicon powder composite materials. According the method, achieving maximum magnetic strength (26.58 emu/g) of Fe3O4/SiO2 magnetic composite material, it was as 765.1 times as the magnetic strength of average micro silicon powder.The third part of this paper is the application research of ferroferric oxide/micro silicon powder composite materials. By adding ferroferric oxide /micro silicon powder composite materials to polypropylene, the composite materials of polypropylene- ferroferric oxide / micro silicon powder was prepared. The composite material characterized by the tensile strength of 35.223 MPa, elastic modulus of 3.059 GPa, and magnetized intensity of 1.0368 emu.g-1,, it priors to the pure polypropylene. Finally, the polypropylene compound plastic with magnetic feature was obtained.