磁悬浮式加速度计悬浮体的研究
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摘要
本文研究了磁悬浮式加速度计悬浮体的超顺磁性及其设计方法。在实现磁悬浮式加速度计悬浮体的超顺磁性机理、磁力、纳米颗粒的分散方法等方面进行了研究。首先分析了实现磁悬浮式加速度计悬浮体超顺磁性的机理以及具有超顺磁性的磁悬浮式加速度计悬浮体在外磁场中的磁化过程和所受磁力；其次分析了不同纳米颗粒的制备方法,不同高分子聚合物的特殊性能和纳米颗粒的分散机理；然后根据磁悬浮式加速度计的特殊要求,利用化学共沉淀法制备纳米四氧化三铁颗粒并利用机械高剪切法将其分散到双马来酰亚胺基体中；最后对所制备的超顺磁性磁悬浮式加速度计悬浮体样品进行了测试。
本文共分为六章三大部分。第一部分在阅读大量文献的基础上着重介绍了现有的几种加速度计中的悬浮体现状及各自存在的缺陷,并介绍了利用纳米颗粒与高分子聚合物制备超顺磁性复合材料的研究现状。第二部分对如何使磁悬浮式加速度计悬浮体具有超顺磁性的机理进行了分析,研究了超顺磁性磁悬浮式加速度计悬浮体在外磁场中的磁化以及其在外磁场中所受的磁力。分析了不同纳米颗粒制备方法的优劣和不同高分子聚合物的优劣,研究了纳米颗粒的分散机理。第三部分根据磁悬浮式加速度计悬浮体的特殊要求,利用化学共沉淀法制备出超顺磁性纳米四氧化三铁颗粒,选择温度作用范围大、力学性能和绝缘性能良好的双马来酰亚胺作为基体,利用机械高剪切方法将纳米四氧化三铁颗粒较均匀分散于基体中而制成了超顺磁性磁悬浮式加速度计悬浮体样品。对样品的测试结果表明自制的磁悬浮式加速度计悬浮体样品具有超顺磁性,其内部的纳米四氧化三铁颗粒得到较均匀的分散且没有发生团聚,改变作用于超顺磁性磁悬浮式加速度计悬浮体的外加磁场可以改变其所受的磁力并最终实现悬浮。
The superparamagnetism and designing methods of levitation objects of magnetic levitation accelerometer was studied in this paper. The study of this paper focused on the mechanism of superparamagnetism, magnetic force, and dispersion method of levitation object of magnetic levitation accelerometer. Firstly, this paper analyzed the mechanism of realized superparamagnetism, as well as the magnetization procedure and magnetic force of superparamagnetic levitation object of magnetic levitation accelerometer in external magnetic field. Secondly, different preparation methods of nanoparticles and properties of different polymer were compared. Thirdly, magnetite nanoparticles were prepared by chemical co-participation method and then dispersed into bismaleimide matrix via mechanical high shear method, according to the special required properties of levitation object. Finally, the prepared samples of levitation object were tested.
The thesis was composed of six chapters, including three parts. Firstly, based on the reading of various materials, several kinds of levitation object of accelerometer were introduced and there defects were analyzed, as well as the situation of preparation of superparamagnetic composite using nano particles and polymer. Secondly, the thesis analyzed the mechanism of superparamagnetism of levitation objects of magnetic levitation accelerometer, studied the magnetization and magnetic force of levitation objects in external magnetic fields. In addition, the thesis analyzed the advantages and disadvantages of different methods for preparing magnetite nanoparticles and different kinds of polymer, studied the mechanism of nano magnetite dispersion. Finally, according to the specific requirement of levitation object of magnetic levitation accelerometer, superparamagnetic magnetite nanoparticles were prepared via chemical co-participation method. Bismaleimide, which have wide temperature range, excellent mechanic and isolation properties, was chose as matrix. Samples of superparamagnetic levitation object were prepared via dispersed magnetite nanoparticles into the bismaleimide matrix using mechanic high shear method. Test results of demonstrated that those self-prepared levitation object samples exhibited superparamagnetism and the magnetite nanoparticles were well dispersed. Those samples can be levitated by changing their magnetic force in external magnetic fields via adjusting magnetic field. Experiment results showed that the method for preparing superparamagnetic levitation object was valid.
本文共分为六章三大部分。第一部分在阅读大量文献的基础上着重介绍了现有的几种加速度计中的悬浮体现状及各自存在的缺陷,并介绍了利用纳米颗粒与高分子聚合物制备超顺磁性复合材料的研究现状。第二部分对如何使磁悬浮式加速度计悬浮体具有超顺磁性的机理进行了分析,研究了超顺磁性磁悬浮式加速度计悬浮体在外磁场中的磁化以及其在外磁场中所受的磁力。分析了不同纳米颗粒制备方法的优劣和不同高分子聚合物的优劣,研究了纳米颗粒的分散机理。第三部分根据磁悬浮式加速度计悬浮体的特殊要求,利用化学共沉淀法制备出超顺磁性纳米四氧化三铁颗粒,选择温度作用范围大、力学性能和绝缘性能良好的双马来酰亚胺作为基体,利用机械高剪切方法将纳米四氧化三铁颗粒较均匀分散于基体中而制成了超顺磁性磁悬浮式加速度计悬浮体样品。对样品的测试结果表明自制的磁悬浮式加速度计悬浮体样品具有超顺磁性,其内部的纳米四氧化三铁颗粒得到较均匀的分散且没有发生团聚,改变作用于超顺磁性磁悬浮式加速度计悬浮体的外加磁场可以改变其所受的磁力并最终实现悬浮。
The superparamagnetism and designing methods of levitation objects of magnetic levitation accelerometer was studied in this paper. The study of this paper focused on the mechanism of superparamagnetism, magnetic force, and dispersion method of levitation object of magnetic levitation accelerometer. Firstly, this paper analyzed the mechanism of realized superparamagnetism, as well as the magnetization procedure and magnetic force of superparamagnetic levitation object of magnetic levitation accelerometer in external magnetic field. Secondly, different preparation methods of nanoparticles and properties of different polymer were compared. Thirdly, magnetite nanoparticles were prepared by chemical co-participation method and then dispersed into bismaleimide matrix via mechanical high shear method, according to the special required properties of levitation object. Finally, the prepared samples of levitation object were tested.
The thesis was composed of six chapters, including three parts. Firstly, based on the reading of various materials, several kinds of levitation object of accelerometer were introduced and there defects were analyzed, as well as the situation of preparation of superparamagnetic composite using nano particles and polymer. Secondly, the thesis analyzed the mechanism of superparamagnetism of levitation objects of magnetic levitation accelerometer, studied the magnetization and magnetic force of levitation objects in external magnetic fields. In addition, the thesis analyzed the advantages and disadvantages of different methods for preparing magnetite nanoparticles and different kinds of polymer, studied the mechanism of nano magnetite dispersion. Finally, according to the specific requirement of levitation object of magnetic levitation accelerometer, superparamagnetic magnetite nanoparticles were prepared via chemical co-participation method. Bismaleimide, which have wide temperature range, excellent mechanic and isolation properties, was chose as matrix. Samples of superparamagnetic levitation object were prepared via dispersed magnetite nanoparticles into the bismaleimide matrix using mechanic high shear method. Test results of demonstrated that those self-prepared levitation object samples exhibited superparamagnetism and the magnetite nanoparticles were well dispersed. Those samples can be levitated by changing their magnetic force in external magnetic fields via adjusting magnetic field. Experiment results showed that the method for preparing superparamagnetic levitation object was valid.
引文
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