浅谈精益生产与绿色制造的融合

精益生产和绿色制造都是现代流行的两种生产方式,各有其特点,本文通过研究分析认为精益生产和绿色制造在理论上有很多有效融合点,并通过江苏柏鹤化工集团公司的具体例子研究分析了其在管理实践上的具体融合。     

Phase and microstructure of TbCuT-type SmFe melt-spun powders

The SmxZr0.3Fe9.1-xCo0.6(x=0.8,0.9,1.0) powders were prepared by melt-spun method with different quenching velocities.The phase and microstructure were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The Th2Zn17-type structure of the as-cast state changed to TbCu7-type after quenching to a rotating molybdenum roll under certain velocity,and the formation of TbCu7-type phase was strictly depending on the Sm content and roll speed.The SEM morphology showed that the Fe-rich zone was typically fish-bone structure and TEM diffraction pattern indicated the nano-scale crystal size with TbCu7-structure when x=0.9,and FCC type γ-Fe on the basis of α-Fe formed in the non-equilibrium solidification could be detected by selected area electron diffraction(SAED) indexing in the x=0.8 samples.     

白光LED用荧光粉的国内外专利分析

发光二极管(Light Emitting Diode,LED)因具有高效节能、绿色环保、超长寿命等优势,被视为最具发展前景的新一代照明技术。此外,因具有功耗低、色彩还原性好、响应快、寿命长等优势,白光LED在液晶显示(Liquid Crystal Display,LCD)用背光源领域的市场份额也在迅速增长。自1962年NickHolony等利用磷砷化镓(GaAsP)制备出第一支红光LED以来,经过50年的发展,LED的发光范围逐渐扩展到绿光、黄光,光效也从早期的0.1lm/W达到的254m/W(2012年4月)。由于白光最     

白光LED荧光粉研究及应用新进展

基于白光发光二极管技术的迅速发展以及荧光粉对白光LED器件的发光效率、显色性和使用寿命等性能的决定性影响,系统阐述了蓝光LED芯片激发用铝酸盐、硅酸盐、氮化物和氮氧化物系列黄色、红色和绿色荧光粉的研究进展和应用现状。探讨了上述荧光粉的研究重点、发展趋势和应用前景,指出需要进一步提高铝酸盐黄粉的发光效率,开发新型高光效氮化物和氮氧化物红粉和绿粉及其低成本制备技术,以满足高光效、高显色、低光衰型白光LED器件制作需要。     

Luminescence properties of Eu2＋ -doped Ba3Si6O12N2 green phosphor： concentration quenching and thermal stability

The efficient Eu2+ -doped Ba3 Si6O12N2 green phosphors were prepared by a traditional solid state reaction method under N2 /H2 atmosphere at a temperature up to 1350 oC for 12h. Photoluminescence (PL) properties showed a broad emission band with a peak of 525 nm and the full width of half-emission maximums (FWHM) of 70 nm under 460 nm light irradiation. The X-ray diffraction patterns (XRD) and scanning electron microscope (SEM) images of the synthesized powder demonstrated its pure phase and excellent crystallization. Quenching concentration in this phosphor was found to be 0.3. The mechanisms of concentration quenching and redshift of emission peak with increasing concentration of Eu2+ were studied. The temperature dependence measurement of this green phosphor revealed excellent thermal quenching property compared to silicate green phosphor. It is believed that Ba3 Si6O12N2 :Eu2+ is an excellent green phosphor for UV or blue chip based white LEDs.     

层状锂镍钴锰氧化物正极材料的改性研究进展

过渡金属(Ni,Co,Mn)氧化物、氢氧化物或碳酸盐前驱体与锂盐经高温焙烧形成的固溶态层状锂镍钴锰氧化物正极材料,具有高放电比容量、低成本等一系列优点,成为研究的热点,并开始广泛应用。然而锂镍钴锰氧化物正极材料在安全性、循环性等方面仍需改善,尤其是在高电压、高温度和高倍率下的充放电性能有待进一步提高。很多研究结果已证明表面包覆和体相掺杂是改善正极材料电化学性能的有效方法。通过表面包覆改性可阻止电极材料与电解液的直接接触,抑制循环过程中HF对电极材料的侵蚀,减少电极材料与电解液的副反应,降低电池在充放电过程中的电荷转移电阻,可进一步提高材料的高倍率电化学性能;而引入掺杂离子可以提高晶体晶格能,稳定材料结构,可提高材料的循环性能。本文对锂镍钴锰氧化物正极材料表面包覆和掺杂的研究现状进行了较全面的分析和总结,并对今后的研究方向提出展望。     

FeS—PbS和PbS—ZnS二元系的热力学优化

采用Ｒｅｄｌｉｃｈ－Ｋｉｓｔｅｒ多项式描述体系液相的过剩自由焓，根据试验相图和已知的热力学数据优化得到了ＦｅＳ－ＰｂＳ和ＰｂＳ－ＺｎＳ二元素的热力学参数。用优化结果计算的相图与试验测量值吻合较好。     

户式中央空调系统分析与设计研究

介绍了户式中央空调系统的特点及类型。并对设计中热工计算部分存在的问题进行了探讨，主要包括室内设计参数的确定及系统冷负荷的计算。     

A novel method for the synthesis of YAG:Ce phosphor

YAG:Ce phosphor was synthesized by a novel simple method,wherein the admixture of three raw materials(Y2O3,α-Al2O3 and CeO2) were first acidified by diluted nitric acid to prepare a precursor,followed by a high temperature heating treatment of the obtained precursor under reductive atmosphere.Through XRD measurement and SEM observation,it was found that Y2O3,one of the raw material,was firstly dissolved into the diluted nitric acid,and then recrystallized on the surface of both α-Al2O3 and CeO2 to form a no...     

退役动力电池中磷酸铁锂的回收再生研究进展

随着新能源汽车产业的持续发展,动力电池将会逐步达到寿命周期而退役,首先退役的主要是早期投入市场的磷酸铁锂电池。对磷酸铁锂正极材料的回收可分为资源化回收和再生回收两种,围绕这两个方向科学家开展了大量的研究。本文首先对Li,Fe的资源化回收进行总结,从回收体系对回收效率影响的角度对文献进行分析,并指出了资源化回收存在的不足。研究显示,磷酸铁锂晶体结构十分稳定,通过简单热处理即能修复其失效结构。因此,本文对磷酸铁锂材料的修复再生技术研究进展进行了详细总结,主要从直接再生、补锂再生、提纯得到磷酸铁后再生等方面进行分析,介绍了各项技术的最新研究进展。此外,本文还介绍了一些新型回收技术,如无毒无害溶剂的使用、混合正极的选择性剥离、生物回收技术等。通过以上对磷酸铁锂材料回收和再生研究进展的系统总结,对退役磷酸铁锂电池回收的未来发展方向做出展望。