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题名	磁记录钡铁氧体磁粉热处理工艺及设备的研究
作者	夏志刚
学位类别	博士
答辩日期	1998-04-26
授予单位	中国科学院研究生院
导师	李佑楚
关键词	钡铁氧体磁粉 磁记录材料 粉末热处理 热处理机理 循环流化床
其他题名	Heat-treating Technology and Equipment for Preparing Barium-ferrite Magnetic Recording Powder
中文摘要	本文对循环流化床用于粉末材料--磁记录钡铁氧体磁粉的热处理进行了理论上和实践上的探讨，证实循环流化床不仅适合热处理，而且具有其独特的优点：热处理温度降低，操作方便，避免烧结。循环流化床对磁粉热处理有如此益处的原因是：气、固接触良好，热、质传递阻力减小，流动的空气带走了反应产生的气体，有利于反应的进行。通过化学分析和X射线衍射的检测，确定了反应前后物料中所含成分及其存在状态。对热处理反应过程的研究给出，反应物质是从非晶态直接转变为晶态的钡铁氧体。对钡铁氧体的热物性估算及合成热力学分析表明，在很大的温度范围内都是热力学有利的，但动力学不利。原料粒度减小、混合程度增加和助熔剂的使用有利于反应速度的提高。实验研究了在循环流化床和马弗炉中磁粉性能与热处理温度及时间的关系，以及反应进程随温度、时间的变化关系，得到了相应的反应动力学规律。通过对流化床热处理设备的结构设计和流动实验，掌握了在高温下的流动规律和特性。同时，还对设备的耐腐蚀问题进行了探讨。以上结果不仅对磁记录钡铁氧体磁粉的研制和生产有重要意义，对其它粉末材料的热处理也会有深远影响。
英文摘要	This work changed the static treatment to the fluidization treatment, and investigated the feasibility of circulating fluidized bed(CFB) used in the heat treating powder material in theory and practice. It proved that the CFB is suitable for this heat treatment process, and it has unique advantages: lower temperature, convenient operation and sinter avoidance. The main reason used for the circulating fluidized bed is that the contact between gas and solid is very good, the heat and mass transfer resistances are small, and the flowing air takes away some gas product and do favor to the reaction. Through chemical analysis and X radiation diffraction, the composition and state of the synthetic powder is obtained. Detection proved that the non-crystal reactants directly change to crystal BaFe_(12)O_(19). This reaction mechanism is favorable in thermodynamics. Some of the thermal properties of the barium ferrite have been estimated, and the synthesis thermodynamics of barium ferrite has been analyzed. The reaction is spontaneous in thermo-dynamics within the regular temperature range, but the reaction rate is relatively slow. Through changing the reactant state or reacting condition, the synthesis reaction would be favorable in kinetics. The technological condition of heat treatment was studied. Through the experiments, the dependence of the magnetic powder properties on the heat treatment temperature and time was measured in CFB furnace and in muffle furnace, and the reaction kinetics was explored. In the structure design and flow experiment of the circulating fluidized bed heat treating furnace, we observed the flow behaviors under high temperature. At the same time, the equipment was prevented from corrosion by coating the alumina pigment onto the inside wall of the furnace. It is the first time to use the circulating fluidized bed as a heat treatment furnace for the powder material, but it already shows that it has very wonderful particularity. So, it is not only essential for the production of barium ferrite magnetic recording powder, but also helpful for similar processes for preparing some other powder materials.
语种	中文
公开日期	2013-09-27
页码	120
内容类型	学位论文
源URL	[http://ir.ipe.ac.cn/handle/122111/2019]
专题	过程工程研究所_研究所（批量导入）
推荐引用方式 GB/T 7714	夏志刚. 磁记录钡铁氧体磁粉热处理工艺及设备的研究[D]. 中国科学院研究生院. 1998.

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