模铸用高铝质流钢砖的显微结构分析

选取市场上模铸用高铝质流钢砖与用后残砖作为研究对象,通过检测不同高铝质流钢砖的理化性能,对比其使用前后的显微结构变化,进一步探讨模铸过程中高铝质流钢砖的显微结构对钢铁产品质量的影响。结果表明:由于显气孔率较大、结构比较疏松、烧结不致密等特性,高铝质流钢砖在经受钢水冲刷时,钢水容易渗透至高铝质流钢砖内部,加速其损毁;其次,高铝质流钢砖与钢水发生物理化学反应后在其表面生成低熔点物,使钢水中产生夹杂物,影响钢铁产品的质量。     

Preparation of BaMgAl10O17∶Eu2+ and Its Phase Behavior in Microemulsion System

BaMgAl10O17∶Eu2 (BAM) was prepared in the microemulsion system and its phase behavior was studied. There exists a small region in the reverse microemulsion system where the dispersed particles are of spherical form. In this way, BAM blue phosphor with good dispersion can be synthesized. The microemulsion phase diagrams of the pseudo-ternary system (Triton X-100/cosurfactant-oil-BAM brine) were first established intuitively by the dilution method. The microstructure of microemulsions was determined through eyeballing, conductance technique, and polar optical microscopy. Its phase behavior is affected by various factors, such as temperature (room temperature, 30, 40 ℃), oil, surfactants, and cosurfactants in microemulsions. According to the phase diagrams, the microemulsion system of Triton X-100/1-hexanol-hexane-BAM brine was chosen to prepare the precursor. The BAM phosphor can be obtained via sintering the precursor at a comparatively low temperature. The phosphors were characterized by XRD and vacuum ultraviolet (VUV) spectra.     

CIMSCLASS─—面向CIM的零件分类软件开发工具

介绍了一个能为工厂设置零件编码系统和开发零件分类系统的工具系统。该系统能适应用户的具体环境，能对零件的特征信息做较详细的描述和建立相应目标的零件分类系统，从而能在ＧＴ（成组技术）基础上为机械加工零件开发ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成系统提供支持，以满足ＣＩＭＳ的需要。     

氟挥发对氟化物乳白玻璃瓶罐生产的影响

氟挥发对氟化物乳白玻璃瓶罐生产的影响陆德明，周俊梅，付希英（山东轻工业学院２５０１００）（山东德州玻璃厂２５３０１９）ＴｈｅＩｎｆｌｕｅｎｃｅｏｆＦｌｕｏｒｉｎｅＶｏｌａｔｉｌｉｚａｔｉｏｎｏｎＰｒｏｄｕｃｔｉｏｎｏｆＦｌｕｏｒｉｄｅｏｐａｌＧｌａｓ...     

展望21世纪的制造业及相关技术

综述了制造业未来的发展前景，重点分析了与制造业相关的制造系统、机械加工技术、生产组织形式、人员素质的发展趋势。     

锂离子电池内隔膜褶皱的原因及消除

在锂离子电池制造过程中,电芯注入电解液时,隔膜局部区域出现褶皱并在隔膜和极片间残留有气泡是一个常见的现象.隔膜上的褶皱和隔膜/极片间界面的缺陷会造成电池内阻分布不均匀,内阻低的地方电池循环过程中可能会局部过充或过放,进而影响电池的一致性及循环性能.针对这一现象,对不同种类的隔膜进行了研究,发现溶剂碳酸二甲酯(DMC)在流动浸润隔膜过程中,各种隔膜均会产生褶皱,且褶皱间距随隔膜厚度的增加略有增大.通过对DMC流动浸润隔膜的前端进行分析,发现隔膜产生褶皱主要有两个原因:DMC局部浸润隔膜过程中,毛细作用导致隔膜在液体流动前端出现隆起,在隔膜和极片间出现间隙.同时,DMC扩散到隔膜和极片的内部孔隙所排出的气体在极片/隔膜界面处积累形成气泡,导致隔膜出现局部的变形和皱褶.为解决上述问题,本文提出在电池加工过程中把涂布有聚偏氟乙烯(PVDF)的复合隔膜与正负极片热压黏合,粘合力抵消DMC浸润隔膜时所产生的毛细作用,能够减少或完全消除隔膜的褶皱.实验表明,当隔膜和正极极片热压后的剥离强度小于10 mN/cm时,黏结力尚不足以完全平衡毛细作用,隔膜仍会出现局部的皱缩,但褶皱数量明显减少.当剥离强度大于15 mN/cm时,隔膜的褶皱现象才被完全消除,说明提高隔膜与极片间的黏结强度,是一个解决隔膜/极片界面处缺陷的有效方法,隔膜褶皱等宏观缺陷的消除也有利于提高锂离子电池的一致性及循环稳定性,具有明确的实际应用价值.     

Application of hindered piperidine amine and/or tertiary amine in the modification of polyamide 6

PA 6 resin was produced in a hydrolytic‐polymeric process in which ε‐caprolactam was polymerized in the presence of water as initiator, isophthalic acid and benzoic acid as chain regulators, by polymerizing caprolactam in the presence of 7.5% by weight of water, 0.2% by weight of isophthalic acid, 0.1% by weight of benzoic acid, each percentage being based on caprolactam. By adding hindered piperidine amine and/or tertiary amine to the polymeric system, the effects of additives on the polymer were studied. The results showed that: the addition of 0.1 ～ 0.2% additives can improve the melt stability of polyamide 6; the addition of 0.2% additives can protect mechanical properties of polyamide 6 fibers after exposure to high temperature; and the addition of 0.05 ～ 0.25% additives can increase the amino end group content of polyamide 6 and thereby increase the dyeability of polyamide fibers. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2489–2493, 2004     

电生成Fenton试剂降解活性墨绿B的研究

用活性炭纤维复合铁丝制成电极,在阴阳两极的协同作用下,电生成Fenton试剂处理活性墨绿B模拟废水.研究不同温度时电解过程中活性墨绿B浓度的变化情况,做一级反应线性拟合,初步探索反应机理.证明电催化降解活性墨绿B的过程符合一级反应;反应速率常数随着温度的升高而增大,线性拟合后可以得到阿仑尼乌斯公式,计算出反应活化能为Ea=22.3 kJ·mol-1.比较废水处理的不同方法,发现阴阳两极协同作用的电Fenton法效果最好,色度去除率可以达到90%以上;紫外可见光谱研究发现,活性墨绿B的生色基团受到破坏,有小分子生成;可以确定处理废水是电解-吸附-气浮-絮凝的协同作用.