为了提高超细铁纤维的抗氧化性能并改善其电磁参数,采用SiO_2包覆/H_2还原复合工艺对超细铁纤维(D≈0.3 μm)进行改性,并对包覆层厚度、纤维电阻率、电磁参数、吸波性能、抗氧化性能等进行分析测试.实验结果表明:在优化工艺条件下得到平均理论厚度为3 nm的SiO_2包覆层,能使纤维的表面绝缘化,有效地提高纤维的吸波性能,并显著提高纤维的抗氧化性能;对包覆纤维进行H_2还原处理,在保证防烧结的前提下能有效降低其杂质含量.
In order to improve the oxidation resistance and electromagnetic parameters of the superfine iron fiber, SiO_2 coating and H_2 reduction processes were introduced to modify the superfine iron fiber. The coating thickness, resistivity, electromagnetic parameters, absorbing performance, oxidation resistance etc were measured and analyzed. SiO_2 coating with average thickness of 3 nm can be achieved by optimized process, which insulates the surface of the fiber, and enhances the absorbing performance and oxidation resistance of the fiber. H_2 reduction of the SiO_2 coated fiber reduces the impurity content prominently when the sinter of the fiber is prevented by the SiO_2 coating.
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