铸造用自硬磷酸镁粘结剂砂性能的研究

磷酸盐粘结剂是铸造型砂粘结剂的发展方向之一,但传统磷酸盐粘结剂存在抗湿性差等不足.以氧化镁和改性磷酸盐为主要组分制备磷酸镁粘结剂,通过改变氧化镁与磷酸盐(A/P)的比例,研究磷酸镁粘结剂铸造型砂的性能.结果表明:磷酸镁粘结剂砂具有自硬性;磷酸镁粘结剂用量占原砂质量10％时,1 h抗拉强度可达到0.3 MPa,24 h抗...     

金刚烧结陶瓷铸造砂及其应用

金刚烧结陶瓷铸造砂是以优质焦宝石矿物为主要原料,经制粉、造粒、烧结、筛分、级配工艺获得的球形人造陶瓷砂。其含泥量、含水量、热膨胀性、角形系数、耗酸值低,粒形圆整,耐火度高,抗磨损破碎、抗压、可再生性能好,具有作为铸造用砂理想的性能指标。金刚烧结陶瓷铸造砂对各种砂型铸造工艺均具有良好的工艺适应性,用于铸铁、碳钢、合金钢等材质铸件的生产,无论是中小铸件还是大型铸件,均取得了令人满意的效果,表现出了良好的铸造工艺性能。     

铸造废砂资源化研究分析

综合分析了以铸造废砂为主要原料制造建筑墙体材料、保温隔热材料、装饰材料和聚合物基废弃物复合材料的工艺、技术、经济指标, 结果表明： 铸造废砂资源化将产生显著的社会、经济和环境效益。     

三缸球铁曲轴铁型覆砂铸造工艺改进

介绍了三缸球铁曲轴铁型覆砂铸造工艺，以TJ370Q曲轴为例，分析了生产过程中产生的主要铸造缺陷．并通过相应的铸造工艺改进，铸废率大大降低，取得了较好经济效益。     

铸造烧结陶粒砂在制芯中的应用

介绍了烧结陶粒砂主要性能特点、成分和耐火度,及烧结陶粒砂和宝珠砂主要性能指标。阐述了铸造烧结陶粒砂在冷芯盒和覆膜砂制芯工艺的开发背景和应用情况。     

碱性酚醛树脂熔融陶瓷砂烧结层的形成机理与解决对策

碱性酚醛树脂熔融陶粒砂铸造是一种生产高品质铸钢件的优异工艺,但是该工艺存在型砂烧结导致清砂困难的问题.为此,以铸钢磨盘的铸造为例,采用微观形貌分析、成分分析、烧结对比试验,研究了碱性酚醛树脂熔融陶粒砂在铸造过程中烧结成壳的机理.研究发现,碱酚熔融陶粒砂烧结成壳归因于高温作用使得陶粒砂之间形成烧结颈将砂粒粘结在一起.烧结...     

铸造砂-地膜复合材料界面的研究

研究了以铸造废砂为填料、废旧地膜为基体,制备复合材料的界面问题.用加热-振动的方法可有效地除去覆盖在铸造水玻璃废砂表面的大部分惰性膜;用偶联剂进行表面改性后,可在不同程度上提高铸造废砂-废旧地膜复合材料的强度.提出并验证了制备铸造砂-地膜复合材料的有关工艺参数.     

铸造废砂集中处理模式研究

文章针对铸造废砂治理途径多元化的发展趋势,提出了建立区域性铸造废砂处理中心的思路,以解决困扰铸造行业多年的铸造废砂治理问题.并根据设计建成的铸造废砂柔性处理系统为模式,介绍了铸造废砂处理中心的设计思路和要点.     

铸造用煤粉的特性及其质量要求

粘土湿型砂的主要特点是便于造型，经震击和压实即可制成所需的形状，而且所用的原材料，如硅砂、粘土和煤粉等添加剂都价格低廉、资源丰富。因此，在各种铸造工艺蓬勃发展的今天，粘土湿砂造型工艺在铸造行业中仍占有绝对优势。     

用水玻璃废砂制备玻璃基复合材料的研究

研究了以水玻璃废砂和废玻璃为主要原料,用烧结复合法制备玻璃基复合材料的工艺技术,探讨了影响材料性能的工艺参数.研究结果表明,用水玻璃废砂制备的玻璃基复合材料兼具玻璃和陶瓷的性能,可替代天然石材而广泛使用.     

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.     

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.     

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.     

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.