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1.
高炉锰铁液固态的锰磷成分差异   总被引:1,自引:1,他引:0  
用数理统计方法对大量生产记录数据进行了分析核对,确认高炉锰铁在液、固两种状态时,锰、磷成分存在着差异这一事实。并确定了固态锰铁含锰量降低、含磷量增加的成分劣化区间为:锰的平均降低值在-0.275%和 0.022%之间,磷的平均升高值在-0.0015%和 0.0171%之间。按GB7730.1-7730.4-87规定与允许化验误差比较分析,也有一定超差比例存在。  相似文献
2.
Y0.9-xGdxEu0. 1 BO3 phosphors were synthesized by spray drying (SD) method, and the results were compared with those by conventional solid state (SS) and citrate gel (CG) methods. The PL intensity of phosphors increases with the increase of x value in Y0.9-xGdxEu0.1BO3(prepared by SD) due to an energy migration process like Gd^3 - (Gd^3 )nEu^3 occurred in the material. Conlpared with the latter two methods, the phosphor particles prepared by spray drying method have a better morphology, such as homogeneous size (about 1 - 3μm) with spherical shape and smooth surface.Furthermore, the spray drying-derived phosphors have higher photoluminescence (PL) intensity than those by citrate gel method, but still a little lower than those by the solid state method.  相似文献
3.
High-quality coking coals all over the world are gradually approaching extinction. These days, steel industries are trying to focus more on the utilisation of non-coking grades of coal. The present work involving high-ash, high-volatile lignite coal can be used indirectly in iron-making processes. Direct use is not possible due to low amount of carbon and high value of ash. High ash content leads to huge sulphur content, and this leads to high cost involvement in secondary processes. On the other hand, huge amount of iron ore fines are generated during mechanised mining, sizing, screening, transportation, beneficiation and sintering processes. Iron ore nuggets are formed from inferior quality iron ore fines using suitable binders with the applied pressure. Mechanical properties of iron ore nuggets are also assessed through shatter and abrasion test. A furnace was designed, to indirectly utilise high-ash, high-volatile lignite coal, for pre-reduction iron ore nuggets. Iron ore nuggets were partly reduced by CO, H2 and fine carbon produced from volatilisation of coal. Optimized pre-reduced nuggets, having high mechanical stability was directly charge in the raising hearth furnace for pig iron production.  相似文献
4.
热力学计算表明了在二氧化碳气氛下高碳锰铁固态脱碳的可行性。实验采用正交试验法来分析各因素影响程度的大小。高碳锰铁颗粒表面与CO_2发生固-气反应,颗粒内部锰的氧化物与其碳化物发生固-固反应进行脱碳。结果表明:固体颗粒度是脱碳的主要影响因素,增大目数,升高温度,减小换气间隔能促进脱碳反应进行。试验中最低含碳量可达0.025%。  相似文献
5.
在rC:rO原子摩尔比为1.06、rCaO:rSiO2分子摩尔比为1.27的条件下,通过电子探针面扫描成分分析,对微波加热含碳氧化锰矿粉固态还原过程中硫的分配进行了研究。结果表明:加热温度为1000~1300℃时,88%-96%的硫分配于气相中,锰铁金属化物中的平均硫含量为0.002%~0.017%;随着微波加热温度的提高和保温时间的延长,锰铁金属化物中的含硫量与含铁量呈负消长的关系,而与含锰量呈正消长的关系;提高微波加热温度和延长保温时间,有利于进一步改善含碳锰矿粉的气化脱硫效果。与传统冶炼方法相比,微波加热含碳锰矿粉以气化脱硫为主,并可以获得良好的脱硫效果。  相似文献
6.
硫是钢铁生产中的有害元素之一,精确测定和在线检测熔融金属中的硫含量是钢铁冶金过程中一项至关重要的任务。固体电化学原理是一种测量熔融金属中硫含量的精确方法。然而,到目前为止,还没有找到一种化学性质稳定和离子电导率高的硫化物固体电解质材料,因此,人们将常用的固体电解质材料(如ZrO2基固体电解质和-βAl2O3等)与化学性质相对稳定的硫化物辅助电极相结合进行间接测硫。在一些情况下,无需将固体电解质材料与辅助电极结合,而直接使用-βAl2O3也可用于测硫,辅助电极是在测硫过程中在固体电解质与辅助电极界面原位生成的。简要回顾了这些固体电化学间接测硫所使用的方法和材料。  相似文献
7.
借助于液淬技术、光学显微镜和电子显微镜,考察了等温热处理技术制备AM60B镁合金非枝晶锭料的可能性,研究了AM60B镁合金的微观组织演变。结果表明:AM60B镁合金铸件经过620℃×60min半固态等温热处理后,枝晶状的铸态组织变成圆整的球状半固态组织;半固态等温热处理过程中非枝晶组织的形成主要是由于原子扩散和能量起伏等原因造成。  相似文献
8.
9.
采用固相法制得了SmCoxFe1-x03(x=0,0.2,0.4,0.6)粉体.借助XRD,SEM对不同Co掺杂量的SmCoxFe1-xO3粉体的物相组成和形貌进行了表征.此外,利用网络分析仪测试了不同Co掺杂量下SmCoxFe1-xO3的电磁特性及微波反射损耗性能.测试结果表明:采用固相法在1250℃、保温3h、当Co掺杂量x≤0.4时,可以制得单一相的SmFeO3粉体;颗粒呈现不规则形貌,颗粒尺寸随着掺杂量的增加有所减小,当掺杂量x=0.4时,平均颗粒尺寸约为1 μm;适量掺杂Co元素后,材料的介电损耗有所增强,样品的复介电常数同时也有所改善;当单层SmCo0.4Feo.6O3材料的厚度为2.1mm时,反射损耗在15.8 GHz左右出现约为-21 dB的峰值.  相似文献
10.
In order to develop novel cathode materials with high performance for intermediate temperature SOFC(IT-SOFC),Ca and Mn doped rare earth oxides La1-xCaxFe0.9Mn0.1O3-δ(x=0.1,0.3 and 0.5,denoted as LCFM9191,LCFM7391 and LCFM5591) were synthesized by solid state reaction(SSR) method.The formation process,phase structure and microstructure of the synthesized samples were characterized using thermogravimetry/differential scanning calorimetry(TG/DSC),X-ray diffraction(XRD) and scanning electron microscopy(SEM).The thermal expansion coefficients(TEC) of the samples were analyzed at 100-900 oC by thermal dilatometry.The electrical conductivities of the samples were measured with direct current(DC) four-terminal method from 300 to 850 oC.The results indicated that the samples(x=0.1 and 0.3) exhibited a single phase with orthorhombic and cubic perovskite structure,respectively after being sintered at 1200 oC for 3 h.The electrical conductivity of the samples increased with temperature up to a maximum value,and then decreased.The small polaron hopping was regarded as the conducting mechanism for synthesized samples at T≤600 oC.The negative temperature dependence occurring at higher temperature was due to the creation of oxygen vacancies for charge balance.LCFM7391 had higher mixed conductivity(>100 S/cm) at intermediate temperature and could meet the demand of cathode material for IT-SOFC.In addition,the average TECs of LCFM9191 and LCFM7391 were 11.9×10-6 and 13.1×10-6 K-1,respectively,which had good thermal match to the common electrolytes.  相似文献
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