| Sm-Co共掺杂锶铁氧体的固相制备与磁防蜡性能 |
| Magnetic-Paraffin-Control Properties of Sm3+ and Co2+ Co-Doped SrFe12O19 Prepared by Solid-State Reaction |
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| 摘要: 以硝酸锶、硝酸铁、硝酸钐、硝酸钴为原料, 采用低热固相法制备出前驱体, 经灼烧后得到最终产物, 使用XRD、EDX、SEM对其表征, 表明产物为Sm-Co共掺杂的Sr1-xSmxCoxFe12-xO19(x=0~0.5)锶铁氧体;并发现所制产物具有单一的六方相晶体结构, 粒子尺寸在40~100 nm,随着Sm-Co掺杂量的增大, 晶粒尺寸逐渐减小.经VSM测试:产物的磁性能(Ms,Mr,Hc)随Sm-Co的共掺杂量的增加(0~0.5),先增大后减小, 在x=0.1时表现为最大值(Ms=64.32 A·m2·kg-1、Mr=36.17 A·m2·kg-1、Hc=417.45 kA·m-1).将制得的共掺杂锶铁氧体磁粉, 添加到醇酸清漆中形成防蜡涂层, 通过拉伸强度测试、涂层防蜡率实验、以及晶相显微表征, 发现该涂层随磁粉用量增加, 抗拉强度提高;同时随磁粉磁性的增强, 涂层的防蜡效果增加, 在磁粉用量为2%时, 涂层磁性最大, 防蜡率也达到最大值77.3%. |
| 关键词: 低热固相法 Sm-Co共掺杂 锶铁氧体 磁性能 磁防蜡 |
| 基金项目: 国家自然科学基金(No.51102245)资助项目, 西南石油大学创新团队基金(No.2012XJZT002)资助项目. |
| Abstract: The precursors of final products were prepared by low-heating solid-state reaction, using strontium nitrate, ferric nitrate, samaric nitrate, cabaltous nitrate as raw material, followed by calcining for 2 h to obtain the final products. The as-prepared products, Sr1-xSmxCoxFe12-xO19 (x=0~0.5), were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS), scanning electronic microscope (SEM) and vibrating sample magnetometer (VSM). XRD results show that the Sm3+-Co2+ doped samples possess a pure hexagonal magneto-plumbite phase. The crystallite sizes of the samples are found in the range of 40~100 nm. The sizes decreased as the dosages of Sm-Co increased. VSM results indicate the magnetic properties (Ms, Mr, Hc) of samples first the increase and then decline with the dosages of Sm-Co from 0 to 0.5. The maximum magnetic properties were obtained when x=0.1 and the calcining temperature was 900 ℃. The saturation magnetization value (Ms) was 64.32 A·m2·kg-1. The remanence value (Mr) was 36.17 A·m2·kg-1 and the coercivity value (Hc) was 417.45 kA·m-1. Then these as-prepared powders were added to alkyd varnish for preparing the magnetic coatings. These coatings were used to wax-control experiments, and they were characterized by a tensile-strength test, a paraffin-control rate test and a metallography microscope test. The results show the paraffin-control efficiency increases as the magnetic properties enhanced of the samples. When the amounts of the magnetic powders were added to 2%, the wax-control efficiency reached the largest figure at 77.3%. |
| Keywords: low-heating solid-state reaction Sm-Co doped strontium hexaferrites magnetic properties magnetic-paraffin-control |
| 投稿时间：2014-07-03 修订日期：2014-09-29 |
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| 张乘凯,刘兵,余军,庄稼,肖章波.Sm-Co共掺杂锶铁氧体的固相制备与磁防蜡性能[J].无机化学学报,2014,30(12):2847-2856. |
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