Study on rare earth electrolyte of SDC

The grain boundaries of polycrystalline oxygen ion conductors presented a blocking effect on the oxygen ionic transport across them.It was found that the apparent specific grain boundary conductivity was 2-3 orders of magnitude lower than the bulk conductivity in the temperature range of 200-500 ℃ for normal purity Ce0.85Sm0.15O1.925(SDC)with an average grain size of 320-580 nm.The apparent specific grain boundary conductivity increased with decreasing average grain size.It was found that the space charge potential was nearly independent of grain size,and the reason was analyzed.The increase of the conduction path width was resportsible for the increase in the apparent specific grain boundary conductivity.     

Luminescent properties and application of Eu3+ -activated Gd2(MoO4)3 red-emitting phosphor with pseudo-pompon shape for solid-state lighting

Eu3+ -activated Gd2(MoO4)3 pseudo-pompon-like red-emitting phosphors were prepared by solid-state method.The structure,morphology,and luminescent properties of these powder samples were investigated by X-ray diffraction (XRD),scanning electron microscopy(SEM),and fluorescent spectrophotometry,respectively.The as-obtained phosphors were single crystalline phase with orthorhombic unit cell.The particles of the powder samples had the length of 5-12 μm and width of 3-7 μm with flake shape and large surface area,which is suitable for manufacture of white LEDs.The phosphor could be efficiently excited by the incident light of 348-425 nm,well matched with the output wavelength of near-UV (In,Ga)N chip,and re-emitted an intense red light peaking at 615 nm.By combing this phosphor with a～395 nmemitting (In,Ga)N chip,a red LED was fabricated,so that the applicability of this novel phosphor to white LEDs was confirmed.It is considered to be an efficient red-emitting conversion phosphor for solid-state lighting based on (In,Ga)N LEDs.     

High-pressure scheelite-type polymorph of SmCrO4: synthesis, structural characterization and magnetic properties

The new scheelite form of SmCrO4 oxide was obtained by heating the zircon-type SmCrO4 oxide at 4 GPa and 803 K.X-ray diffraction revealed that this scheelite SmCrO4 phase crystallized with tetragonal symmetry,S.G.141/a and lattice parameters:a=0.50776(3)nm and c=1.15606(2)nm.This structural phase transition from zircon to scheelite involved a decreasing of around 10% in the unit cell volume.Although the Cr-O and Sm-O distances did not change very much in both zircon and scheelite polymorphs,the changes occurred in the bond angles were remarkable that appear to support the proposed reconstructive model to explain this structural zircon-scheelite phase transition.Magnetic susceptibility and magnetization measurements revealed that the scheelite SmCrO4 oxide behaved an antiferromagnetic material,where the Sm3+and Cr5+were simultaneously ordered.The estimated Neel temperature,TN,was 16 K and the critical field at 12 K associated with the memmagnetic transition was 3.2 T.     

Non-Metallic Inclusions in HSLA Steel-Origin,Detection and Refractory Systems to Improve Cleanness

HSLA steels need extremely low levels of tramp elements like P,S,H and O t.During tapping the steel is deoxidized with aluminum and in the secondary metallurgy sulphur (< 10 ppm) and hydrogen (< 1 ppm) are extracted.After tank degassing the steel is strongly Ca-treated by wire feeding to form CaS instead of MnS.Non-metallic inclusions in the steel and centre segregation with MnS are sinks for hydrogen which result in HIC (Hydrogen Induced Cracking).Therefore these steels ask for excellent oxide cleanness and S-contents of < 10 ppm.Macro inclusions of > 50 μm are harmful for the product.These large inclusions are seldom and difficult to be detected.Small inclusions of < 15 μm do no harm to the product.The origin of non-metallic inclusions is,roughly spoken,one third each of de-oxidation-/reoxidation products,refractory and casting powder.Slag carry-over is mainly avoided by sensitive electronic devices.Slag covers and shrouding systems of the steel stream during the transfer of metal between ladle,tundish and mold are effective to avoid reoxidation.Systems to control the flow of steel in tundish and mold favor the floatation of inclusions and their even distribution in the strand.     

Study on the Characteristics of Fluid Flow in Stirring Vessel of New Type Stirring of KR Desulphurization

Aimed at the problem of short life of mixing head in KR mechanical mixing method for desulfurization of hot metal,a new type of mixing stir was proposed.CFD theory was used to simulate the characteristics of the fluid flow for the new type of stirring vessel of water model for KR mechanical desulfurization.Flow characteristics and structures of the flow field were investigated and compared with the traditional cross-flow type.The results show that the new type of impeller can not only improve the defects of the flow caused by stir structure of the traditional type,but also reduce the separation of mixing zone in the stirred tank and make the flow field more uniform to make the desulfurization more fully,thus shortening the mixing time,and improving the life of mixing head.Numerical simulation method has been proven to be sound by comparing with the experimental ones.     

电锌大型玻璃钢电解槽的设计

新型聚脂玻璃钢电解槽在电锌的成功应用,解决了过去老式电解槽渗漏、变形、产能低等问题,给电锌行业提供了很好的借鉴经验.     

Access数据库在采购管理中的应用

介绍了Access数据库的特点和优点,在采购管理中应用的意义.使用Access编写了<供应仓储管理系统>,论述了该系统的设计思想、程序结构及应用效果.该系统的应用,减轻了工作人员劳动强度、提高了工作效率、确保了物资及时供应、减少了资金的占压.     

灰铸铁手工电弧焊的焊补

介绍了铸件在制造和使用过程中出现的各种缺陷和损坏,利用手工电弧焊焊补,从灰铸铁的鉴别,焊接性能出发,对焊补方法及操作技能做了深入分析,在生产中实践取得较好的社会经济效益.     

铁路信号微机联锁动态安全型继电器的制作

微机联锁系统接口用的动态安全型继电器是确保系统安全运行的主要设备.购买所需集成电路片和电子元件,自己动手设计制作,不但成本低,可以满足故障抢修急需,而且还可以提高铁路信号维护人员的技术水平.     

结晶器调宽控制系统在济钢ASP连铸机中的应用

介绍了济钢第三炼钢厂2号ASP连铸机结晶器自动调宽控制系统,对系统的构造、功能、控制原理进行了阐述,结晶器自动调宽控制系统的应用,提高了连铸机的作业率和板坯品质.     

延长澳斯麦特熔炼炉炉砖使用寿命的措施

阐述了目前国内铜熔炼澳斯麦特炉与艾萨炉的炉砖使用寿命情况。分析了影响熔炼炉炉砖使用寿命的主要影响因素,并结合同行已经成熟的操作经验,提出了延长顶吹熔炼炉炉砖使用寿命的措施和方法。     

金川铜合成炉系统配置及装备

金川铜合成炉系统是世界上首次将合成式闪速炉用于炼铜,合成炉与传统闪速炉相比,无论是配置还是生产控制,均有很多的差异,本文通过流程配置、主要装备、主要技术等方面对该系统进行介绍。     

富氧顶吹熔炼炉炉体结构研究

从炉膛内径、耐火材料寿命和炉顶盖寿命三个方面开展了富氧顶吹熔池熔炼炉炉体结构的研究,整体寿命可达12个月,满足熔炼工艺要求。     

炼铅中间物料电炉熔炼工业试验

阐述了在电费低的地区用电炉进行炼铅中间物料的熔炼,所获得的经济技术指标优于传统的鼓风炉或反射炉炼铅工艺.     

铝熔炼炉熔炼技术评述及其研究展望

能源的紧张、环境污染的严重性和优质铝合金铸件的需求对熔炼炉的热效率、污染物排放和熔体质量提出了更高的要求.本文针对目前广泛使用的反射式铝熔炼炉,从铝熔炼的基本原理及其熔炼过程特点出发,介绍了熔体净化处理技术、电磁搅拌技术、高温空气燃烧技术、耐火材料抗侵蚀技术等熔炼技术,同时提出了改善铝熔炼炉性能的研究展望,最终达到节源(资源与能源)减排和优质熔体的多重目的.     

熔炼炉燃烧参数控制

铝和铝合金熔炼是铝加工企业生产中的第一道重要工序,而铝熔炼炉是铝熔炼的关键设备,也是工厂中主要能耗设备,在生产能耗中占有很大比例,一些企业铸轧板材生产中其燃料消耗达到总能耗的50％左右。本文从铝及铝合金熔炼炉燃烧控制参数——天然气流量、助燃风流量、天然气和助燃风比例、炉压、排烟温度——等方面对能耗的影响及之间的相互影响和我厂在各参数控制方面的经验进行综合论述,望能够供同行参考。     

高炉冶炼低硅生铁技术的探讨

高炉冶炼过程中,降硅是一项重大节能增产措施。既可降低高炉焦比和提高产量,也可促使转炉炼钢实行无渣或少渣冶炼,从而降低炼钢成本。本文分析了国内外高炉冶炼低硅生铁的技术现状、硅的还原机理,提出了高炉冶炼低硅生铁的技术措施。     

关于高炉冶炼技术路线的探讨

文章简要介绍了我国炼铁的发展历史，重点探讨了目前高炉冶炼的技术路线，指出了处理好高炉容积、利用系数、冶炼强度以及节能减排等问题的方法。     

铜锌混合精矿的密闭鼓风炉熔炼

简述了高锌低硫氧化铜精矿的吸风烧结－密闭鼓风炉炼粗铜的工艺过程及主要技术经济指标，此工艺技术可行，分离效果好，为我国的炼铜工业开拓了广泛的原料来源。     

铝熔炼炉热平衡测试及节能分析

本文针对国内某铝厂铸造车间的熔炼炉进行热平衡测试和计算,分析了影响熔炼炉热效率的因素,并提出了相应的节能措施。