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Preparation and Application of lightweight magnetic microspheres

Author: ZhaoZuo
Tutor: ZhangQiuYu
School: Northwestern Polytechnical University
Course: Applied Chemistry
Keywords: Lightweight magnetic microspheres Electroless nickel plating Hollow glass microspheres Polystyrene microspheres
CLC: TQ153
Type: Master's thesis
Year: 2004
Downloads: 291
Quote: 4
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Abstract


Traditional magnetic particles have a density limit its application in some special areas, such as magnetic particle density caused by the the traditional absorber density Ambassador magnetorheological fluid subsidence and stealth technology aircraft weight gain problem. If we can reduce the density of the magnetic particles can promote their applications. In this context, we choose two lightweight carrier of hollow glass microspheres and polystyrene microspheres deposited on the carrier surface layer of magnetic material - nickel, electroless nickel plating method, get two lightweight magnetic microspheres and explore its magnetorheological fluid and microwave absorbers. Electroless nickel plating of hollow glass microspheres, we found the key of electroless nickel plating pre-treatment process. We studied the first coupling, re-activation of the pre-treatment process. By orthogonal experiment to determine the optimal coupling conditions, and coupling treatment effect of activation. The study found that the hollow glass microspheres the palladium adsorption capacity after coupling treatment to improve the lot of the active sites of the surface of the microspheres electroless nickel plating greatly increased. Also studied the influence of the bath pH value, loading capacity and other process conditions, to obtain the optimal pH value and the loading range. In polystyrene microspheres electroless nickel plating, we found that the effect of activation of a direct impact on the level of magnetic microspheres yield. The electroless nickel plating of magnetic microspheres apparent major decisions in the activated microspheres apparent, only strictly control the activation process, the introduction of fine particles of activated microspheres electroless nickel plating, in order to obtain small particles, uniform magnetic microspheres. Test two light density of magnetic microspheres, coating morphology, composition and crystal structure: the nickel-coated hollow glass microspheres (average density 3.0g/cm ~ 3) and nickel-coated polystyrene microspheres balls (average density of 2.7g/cm ~ 3) the density is far lower than the conventional magnetic particle density (7 to 8g/cm ~ 3); product coated with a higher rate, coating integrity, uniform coating, dense; plating mainly composed of Ni, similar to its crystal structure and elemental nickel, for the face-centered cubic structure; nickel coated hollow glass microspheres, 400 ℃ heat treatment can make the Ni-P alloy coating crystallization and grain growth, in favor of improve the magnetic properties of the coating. The lightweight magnetic microspheres magnetorheological fluid and microwave absorbers that: as the magnetic particles Northwestern Polytechnical University Thesis Abstract tablets, can significantly improve the sedimentation stability of the magnetorheological fluid viscosity than the initial magnetic field viscosity increased; microwave absorbent, showing the electrical loss absorbing performance. In summary, the use of chemical plating nickel hollow glass microspheres, polystyrene microspheres coated can be coated with a high, full coated, coating evenly, compact lightweight magnetic microspheres, these lightweight magnetic microspheres has broad application prospects.

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