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首页> 外文会议>8th Asian Conference on Solid State Ionics: Trends in the New Millennium; Dec 15-19, 2002; Langkawi, Malaysia >EFFECT OF MILLING TIME ON THE PARTICLES SIZE AND MICROSTRUCTURE OF MILLSCALE DERIVED BaFe_(12)O_(19)
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EFFECT OF MILLING TIME ON THE PARTICLES SIZE AND MICROSTRUCTURE OF MILLSCALE DERIVED BaFe_(12)O_(19)

机译：铣削时间对源自微米的BaFe_（12）O_（19）颗粒尺寸和微观结构的影响

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摘要

This paper was carried out to observe the effect of milling time on the particles and microstructure millscale-derrived BaFe_(12)O_(19). The millscale was dry milled for 16h/20h/24h and sieve (45μm) to obtain fine powder particles. The magnetic and nonmagnetic particles separation was done and oxidized FeO was obtained at 400℃/500℃/600℃ for 10 hours in air. The Fe_2O_3 from the oxidation was crushed for 16h/20h/24h and was using as a raw material in HaFe_(12)O_(19) fabrication. The mixture was calcine at 950℃ for 10 hours in air. The calcine powder was again crushed for 16h/20h/24h to find a fine size particles. The development of stoichiometric Fe_2O_3 was confirmed by XRD result. The existence of submicron powder particle size was confirmed by a Malvern Particle-size Analyser Model No. MSS33544/785. A fine-grained and single-phase polycrystalline microstructure was confirmed to exist by SEM surface scan. The high remanence 2000Oe, 2000Oe saturation magnetisation and 1500Oe coercive force of sample derived from millscale was achieved. The effect of prolonged milling time showed a positive tendency for the formation of rectangular shape crytallites. This is due to the increased homogeneity of the starting mixtures which enhanced the solid state reaction.
机译：进行了观察，以观察研磨时间对颗粒和显微结构的氧化铁来源的BaFe_（12）O_（19）的影响。将干法粉磨干16h / 20h / 24h，过筛（45μm），得到细粉。完成了磁性和非磁性颗粒的分离，并在空气中于400℃/ 500℃/ 600℃下氧化了FeO 10小时。将氧化得到的Fe_2O_3压碎16h / 20h / 24h，并将其用作HaFe_（12）O_（19）制备的原料。将混合物在空气中于950℃煅烧10小时。再次将煅烧粉末粉碎16小时/ 20小时/ 24小时以发现细颗粒。 XRD结果证实了化学计量的Fe_2O_3的生成。通过型号MSS33544 / 785的Malvern粒度分析仪确认了亚微米粉末粒度的存在。通过SEM表面扫描确认存在细粒和单相多晶微结构。获得了氧化皮样品的高剩磁2000Oe，2000Oe饱和磁化强度和1500Oe矫顽力。延长研磨时间的影响显示出矩形冰晶石形成的积极趋势。这是由于起始混合物的均质性提高，从而增强了固态反应。

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