采用X射线衍射(XRD)、扫描电子显微镜(SEM)、能量色散谱仪(EDS)分析粉煤灰中铁组分矿物组成和分布形态,对高铁粉煤灰颗粒电磁参数及复合高铁粉煤灰水泥浆体的吸波性能进行了试验研究.结果表明,粉煤灰中富集在球形颗粒表面的各种微细氧化铁晶体,是高铁粉煤灰产生电磁损耗的物质基础;高铁粉煤灰颗粒具有较高的介电常数和一定的磁导率,是以介电损耗型为主的电磁波有效损耗介质;高铁粉煤灰水泥基复合材料在2～8GHz波段范围内具有吸波性能,其最小反射率为-13.01dB,同时吸波能力可能与材料电导率有关.
Based on the analysis of composition and form for the iron components in fly ash by X-ray diffraction (XRD) .scanning electron microscope(SEM) ,energy dispersive spectrometer (EDS) , the electromagnetic parameters of fly ash particles and the wave absorbing properties of high-iron fly ash grout were studied with experiments. The results showed that: (1)A variety of fine iron oxide crystals enriched in the spherical surface of fly ash particles play an important role in electromagnetic loss; (2) the high-iron fly ash particles have a higher complex permittivity and a certain degree of permeability and are electromagnetic loss media characterized by dielectric loss; and (3) high-iron fly ash cement-based composite materials has obvious wave absorbing properties with the minimum reflectivity-13. 0ldB in the frequency 2-8GHz, however, the wave absorbing capacity of cement-based composite rely on the conductivity of the material.
参考文献
| [1] | 左跃,叶越华,李坚利,陈阳如,熊国宣.水泥基电磁屏蔽与吸波材料的研究进展[J].硅酸盐通报,2007(02):311-315. |
| [2] | 张雄,习志臻.建筑吸波材料及其开发利用前景[J].建筑材料学报,2003(01):72-75. |
| [3] | 康青.手性吸波混凝土研制与展望[J].材料导报,2005(04):74-76. |
| [4] | Jingyao Cao;D.D.L. Chung .Use of fly ash as an admixture for electromagnetic interference shielding[J].Cement and Concrete Research,2004(10):1889-1892. |
| [5] | 钱觉时.粉煤灰特性与粉煤灰混凝土[M].北京:科学出版社,2002 |
| [6] | 赵永椿,张军营,高全,李扬,郑楚光.燃煤含铁矿物的迁移转化特性研究[J].工程热物理学报,2006(03):511-514. |
| [7] | 杨南如,夏元复,陈刚,刘荣川.用穆斯堡尔谱效应研究粉煤灰中含铁相[J].燃料化学学报,1984(04):375-381. |
| [8] | 张覃,毛德明,卢定寿,邹德润.粉煤灰的矿物学特性研究[J].粉煤灰综合利用,2001(01):11-14. |
| [9] | 李辉,商博明,徐德龙,冯绍航,王建礼.粉煤灰中磁珠的微观结构及化学组成[J].矿业研究与开发,2006(06):65-68. |
| [10] | 熊国宣 .水泥基复合吸波材料[D].南京工业大学,2005. |
| [11] | 步文博,徐洁,丘泰,李远强,唐惠东.吸波材料的基础研究及微波损耗机理的探讨[J].材料导报,2001(05):14-17. |
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