共查询到17条相似文献,搜索用时 156 毫秒
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MnZn软磁铁氧体纳米粉末的烧结特性 总被引:5,自引:0,他引:5
锰锌铁氧体纳米粉末具有很强的活性,其烧结特性对于烧结工艺参数十分敏感。采用纳米粉末生产软磁铁氧体可以明显降低烧结温度,缩短烧结时间,有利于铁氧体化学成分和显微组织的控制,进而改各铁氧体的磁性能。研究表明铁氧体纳米粉末在700℃左右烧结后的密度巳接近理论值,纳米粉体对加热速度十分敏感,而且由于纳米粉体比表面积大,客易发生氧化,因此烧结气氛必须严格控制、采用氮气气氛,并调节平衡氧分压。本文结合粉末基本的烧结理论以及纳米粉体特性,对Mnzn铁氧体纳米粉末的烧结特性进行分析。 相似文献
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1引言众所周知,气氛烧结是现代高性能MnZn铁氧体生产中的关键工序,而品质良好、价格便宜的氮气又是实施气氛烧结的基本条件之一。我国是世界上铁氧体生产大国,软磁铁氧体的产量已跃居世界第二位,生产企业很多,因生产规模及设备不同,故采用的供气方式也各异。以... 相似文献
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在软磁铁氧体材料的生产中,粉料活性(比表面积)对生产工艺和材料性能有重要影响,烧结是影响材料性能的关键工序之一.本文概述了比表面积测试仪和热分析仪在软磁铁氧体生产质量控制中的应用. 相似文献
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烧结炉性能的好坏直接影响到烧结式镍基板的制造质量。针对原有烧结炉存在的种种问题,进行了重新设计与改造,使烧结温度得以保证,烧结炉使用寿命提高数百倍,并且安全性能得到改善,可适用于较大规模的生产。 相似文献
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烧结生产作为高炉炼铁顺利进行的前提,在冶金生产中起着相当重要的作用。配料是烧结的重要工艺环节之一,为了达到降低烧结矿成本,提高烧结矿产量和质量的目的,提高配料系统的管理和控制水平很重要。简要阐述了PLC与变频器在烧结配料计算机控制系统中的具体应用,重点介绍了以PLC和变频器为主的控制系统的硬件组成、硬件选择,以及系统主要控制程序。该系统的准确性和可靠性很高,现场运行表明,较好地改变了配料系统的质量控制,取得了满意的使用效果。 相似文献
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By adding a tracer element not normally utilized in the batch, the residence time and mixing dynamics of a furnace can be determined. The furnace considered is a predominantly electric fired furnace with a blanket batch charger. Spodumene containing lithia (Li2O) is used as the tracer and is added into the batch at a constant amount for a period of seven days. The mixing dynamics are modeled through a system of differential equations of mass balance that utilize two parameters to define the batch mixing before entering the tank and three parameters to predict the tank mixing. This results in a model that is easily solvable and that will return the optimal parameter settings when nonlinear least squares are used to assay results from the tracer study. Using this method, complex measurements of temperature distributions, heat conductivity factors, and convection factors are not necessary. Sample results are shown and discussed 相似文献
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综合智能控制策略在电弧炉控制中的应用 总被引:7,自引:0,他引:7
介绍综合智能控制策略在电弧炉炼钢中对提高性能的作用。简述高阻抗电弧炉系统的特点和基于WindowsNT环境下高阻抗电弧炉系统的组成 ,阐述了瞬时值电量采集到有效值的变换算法。针对电弧炉炼钢过程的高度非线性、时变性和不确定性 ,采用了基于遗传退火算法的神经网络控制策略 ,设计了神经网络预估模型和神经网络控制器 ,并优化了功率设定点 ,实现了高阻抗电弧炉炼钢过程的最优化控制。在石家庄钢铁厂的实际应用表明 ,该系统能较好地适应负荷变化与外部干扰 ,其控制性能优于普通电弧炉系统。 相似文献
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The suspension-preheater flash-furnace (SF) process for cement clinkering introduces a calcining flash furnace operating as an integral portion of a suspension preheater, rotary kiln, and clinker cooler system. Preheated raw meal from the suspension preheater is calcined in the flash furnace to 80 to 90 percent decarbonation. The capacity of the SF rotary kiln is increased thereby, since its function is limited to sintering rather than sintering and calcining. The flash furnace incorporates vortex flow to accomplish the mixing of fuel, raw meal, and gases. Effective distribution within the flash furnace limits temperature gradients and eliminates localized elevated temperatures that might otherwise lead to coating and material build-up. Hot combustion gases are recovered from the clinker cooler for use in the flash furnace. An orifice in the kiln gas exit duct serves to balance the parallel gas flows through the kiln and secondary air duct. Operating pressures and temperatures are described. The smaller size of the rotary kiln used in the SF process leads to extended refractory life as demonstrated by operating experience. The SF process is adaptable to the control of internal alkali, sulfur, and chlorine cycles through a gas bypass and through a unique material withdrawal arrangement from the flash furnace. Existing plants may be modified to incorporate the SF process. Nearly 20 commercial scale plants are operating or are being constructed. 相似文献