玻璃微珠表面镍铁氧体包覆层的制备和性能

PREPARATION AND PROPERTIES OF NICKEL FERRITE COATINGS ON GLASS BEADS

采用高分子凝胶法在玻璃微珠表面制备了镍铁氧体包覆层。分别用X射线衍射仪、扫描电镜和HP8510网络分析仪表征复合材料的结构、表面形貌和电磁性能。复合材料中玻璃微珠质量分数(下同)分别为15%,40%和65%。复合粉是由镍铁氧体、石英和莫来石相组成。随着微珠含量的增加,镍铁氧体衍射峰强度逐渐降低,莫来石衍射峰强度逐渐增强。当玻璃微珠含量为40%时,在玻璃微珠表面可获得完整的镍铁氧体涂层。玻璃微珠含量为40%的复合材料在X波段具有较好的介电损耗和磁损耗性能,其介电损耗角正切值和磁损耗角正切值分别可达0.30和0.10。

Nickel ferrite coatings were prepared on the surface of glass beads using the polyacrylamide gel method. The structural characteristics, morphology and electromagnetic properties of the composites were obtained by X-ray diffraction （XRD）, scanning electron microscope （SEM） and HP8510 network analyzer. In the composites, the mass fraction （the same below） of the glass beads were 15%, 40% and 65%, respectively. The phase structures of composite powders were mixtures of nickel ferrite, quartz and mullite. The intensities of the XRD peaks for nickel ferrite decreased rapidly and for mullite, they increased remarkably with the increase of the beads content. A continuous NiFe2O4 coating was obtained when the bead content was 40%. The composite with 40% glass beads exhibited better dielectric loss and magnetic loss properties in the X band. Its dielectric loss tangent and magnetic loss tangent were 0.30 and 0.10, respectively.