CaO-Al_2O_3-SiO_2系粉煤灰微晶玻璃的制备及其性能

以粉煤灰为主要原料,Si O2、Na2CO3、Mg O、Ca O、Zn O、Ca F、硼酸等为辅助原料,采用两步烧结法制备Ca O-Al2O3-Si O2系粉煤灰微晶玻璃。通过差热分析、X射线衍射和扫描电镜等分析测试方法对所制备粉煤灰微晶玻璃的微观结构和性能进行了研究,并利用修正的Johnson-Mehl-Avrami方程和Augis-Bennett方程计算了粉煤灰微晶玻璃析晶活化能和晶化指数。结果表明,不同配方的粉煤灰微晶玻璃均为体积晶化,主晶相为副硅灰石,呈短柱状,为单斜晶系;副晶相为钙长石,为三斜晶系;在5组配方中,Ca O/Si O2为0.33时,粉煤灰微晶玻璃的性能相对较优,Al2O3/Si O2为0.19时,粉煤灰微晶玻璃的活化能相对较小小,析晶过程容易发生。     

晶化温度对高炉渣微晶玻璃性能的影响

以95%炼铁高炉渣和5%钾长石为原料,采用简易的一步烧结法制备炉渣微晶玻璃.利用X荧光,DSC,XRD,SEM等分析手段研究了粉体的化学组成、热学性能和样品的物相组成及显微形貌.结果表明:不同的晶化温度对高炉渣微晶玻璃性能有较大的影响,当晶化温度为830 ℃,烧成温度为1200 ℃时,制备的微晶玻璃主晶相为钙铝黄长石,在微晶玻璃中存在大量均匀分布的微小晶粒,其抗弯强度可达88 MPa.     

二次法制备冶金渣陶瓷-微晶玻璃复合材料

为了改善钢渣陶瓷的外观颜色和表面性能,采用二次烧成法制备出了钢渣陶瓷-高炉渣微晶玻璃复合材料,并对其结构与性能关系进行了研究。陶瓷层主晶相为辉石相,微晶玻璃层主晶相是辉石相和黄长石相。在陶瓷1220℃烧结温度,微晶玻璃880℃析晶温度的最佳条件下,复合材料耐磨性能显著提高,其磨损体积比单体材料降低1倍以上。陶瓷-微晶玻璃紧密结合的过渡层以及微晶玻璃析晶均匀和增加的辉石相有利于复合材料表面性能的改善。     

纳米晶镁铝尖晶石透明微晶玻璃的晶化行为研究

利用DTA、XRD和TEM研究了制备工艺对微晶玻璃晶化行为的影响，并制备出具有纳米镁铝尖晶石为晶相的微晶玻璃。     

CaO-Al_2O_3-MgO-SiO_2矿渣微晶玻璃陶瓷的制备及抗NaOH侵蚀性能

以包钢尾矿为主要原料,采用熔融法制备了Ca O-A1_2O_3-MgO-SiO_2系矿渣微晶玻璃陶瓷,采用X射线衍射(XRD)和扫描电子显微镜(SEM)对微晶玻璃陶瓷的物相组成及显微结构进行了表征,并研究了该微晶玻璃陶瓷的常温力学性能和抗Na OH化学侵蚀的动力学过程。结果表明:所制备微晶玻璃陶瓷的主晶相为透辉石,次晶相为石英,平均粒径约为142 nm;其显气孔率为0.05%,体积密度为3.0 g/cm3,常温抗折强度为71 MPa。Na OH侵蚀动力学研究表明:该微晶玻璃陶瓷的失重率随着侵蚀温度的升高而增大。采用阿伦尼乌斯方程和艾琳方程计算了Na OH侵蚀反应的活化能、反应焓及反应熵,其数值分别为40.8、37.9及–134.7 J/mol。     

赤泥在建筑材料中的应用研究

赤泥是氧化铝生产过程中的固体废弃物,大量堆存会严重污染环境,其综合利用备受关注。介绍了赤泥在水泥行业、建筑用砖、轻质隔热材料以及微晶玻璃等方面的应用研究,分析了存在的问题,并对今后赤泥基建材的研究方向进行了预测。     

被动调Q用微晶玻璃的光学性能

掺钴的镁铝尖晶石微晶玻璃是一种极具前途的新型可饱和吸收材料,可用于饵玻璃激光器的被动调Q,对于饵玻璃激光器的应用推广具有非常重要的作用.本实验制备了纳米镁铝尖晶石为晶相的微晶玻璃,分析了微晶玻璃的吸收光谱产生原因,研究了CoO含量、制备工艺对微晶玻璃吸收系数的影响.     

BaO含量对粉煤灰制备硅灰石微晶玻璃的影响

采用烧结法制备了CaO-Al2O3-SiO2系粉煤灰微晶玻璃。利用X射线衍射测试了微晶玻璃晶相类型,利用电子探针-能谱分析法研究了晶相组成、组织结构及玻璃基体中的氧硅比。结果表明,BaO质量分数由2%增加到5.77%时,氧硅比值由2.80增加到2.91;提高氧硅比降低硅氧四面体网络的连接程度,降低高温粘度及烧结终止温度。微晶玻璃含有单一的硅灰石衍射峰,微晶玻璃中晶相的EDS能谱中只包含Ca、Si、O 3种元素,其相应的原子比值接近1∶1∶3,化学表达式为CaSiO3;BaO含量变化没有改变微晶玻璃主晶相的种类,均为单一的硅灰石晶体。     

粉煤灰微晶玻璃的结构分析及其晶体化学式的确定

利用烧结法制备CaO-Na2O-SiO2系粉煤灰微晶玻璃.采用X射线衍射法、红外光谱分析法、电子探针-波谱分析方法分析微晶玻璃晶相的结构、成分.结果表明:粉煤灰微晶玻璃的主晶相为α-硅灰石,其点阵常数与卡片27-0088的略有差异;Si-OB(非桥氧)、Ca-O的吸收峰相对于标准图谱向高频移动;采用以阴离子为基准的氢当量法,获得了微晶玻璃中硅灰石的晶体化学式.     

发泡剂对废玻璃烧结多孔微晶玻璃结构和性能的影响

以废玻璃为原料,CaCO_3和SiC为发泡剂,采用低温烧结-高温发泡法制备出多孔微晶玻璃。利用差热-热重分析仪、X射线粉末衍射仪、扫描电子显微镜等分析手段,研究发泡剂对多孔微晶玻璃表观密度、平均孔径、孔隙率、晶相结构、显微组织和压缩强度的影响规律。结果表明:以CaCO_3为发泡剂时,随CaCO_3含量增加,多孔微晶玻璃的表观密度与抗压强度都是先减小后增大,孔隙率则与之相反;结晶相为单一硅灰石结构,且结晶度持续增大。以4%CaCO_3和不同含量SiC为复合发泡剂时,随SiC含量增加,多孔微晶玻璃的孔隙率和硅灰石含量提高,平均孔径增大,压缩强度随表观密度增大呈线性增大,为0.7~4.7 MPa。     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.