自动铸造生产线上的抛丸机(一)——转子履带抛丸机开发研究

在已经有近一个世纪使用历史的普通履带抛丸机的基础上，开发成功能用于自动铸造生产线上的转子履带抛丸机专利产品，并介绍其原理、结构、性能和参数。     

SY300电解槽技术的开发与生产实践

本文通过对256台SY300(300kA)电解槽的设计和在河南豫港龙采铝业有限公司200kt/a电解系列的生产实践进行剖析，应用多模式智能控制技术和“四低一高”操作工艺。电解槽运行平糖、高效。三场设计合理．实际测试和设计值吻合。实践证明。SY300电解槽从设计到生产都已达到国际先进水平。     

The Al–R–Mg (R=Gd, Dy, Ho) systems. Part I: experimental investigation

Key experiments were carried out on the three Al–R–Mg (R=Gd,Dy,Ho) systems and the results obtained used for the thermodynamic optimisation reported in a separate paper in this issue [Caccasmani G, De Negri S, Saccone A, Ferro R. Intermetallics this issue.]. The samples were characterized by differential thermal analysis (DTA), X-ray powder diffraction (XRD), light optical microscopy (LOM), scanning electron microscopy (SEM) and quantitative electron probe microanalysis (EPMA). The isothermal sections at 400 °C are all characterized by extended homogeneity regions at a constant rare earth content. The extension of the (Mg,Al)R solid solution, cP2-CsCl type, varies with the R atomic number. Ternary compounds (τ) of Al₂(R,Mg) stoichiometry (hexagonal Laves phases with MgNi₂-type structure) have been found to exist at 400 °C in all the systems. Their temperatures of formation were detected by DTA measurements.     

二通插装阀在锻造自动线机械手液压系统改造中的应用

为解决故障率高、控制精度低的缺点,利用插装阀和PLC技术对锻造自动线机械手液压系统进行了改造,设计了插装阀式液压系统,分析了系统工作原理和改造的技术、经济可行性,取得良好的使用效果.     

纳米TiN改性Ti(C,N)基金属陶瓷的抗热震性能

为研究不同粘结相对纳米TiN改性Ti(C,N)基金属陶瓷抗热震性能的影响,真空烧结制备了粘结相质量分数分别为20%Ni、10%Co-10%Ni和20%Co的Ti(C,N)基金属陶瓷。采用扫描电镜研究了材料的组织,并测量了力学性能。采用压痕-急冷法主要研究了其抗热震性能,结果表明,随着温度的升高和热循环次数的增加,裂纹增长,粘结相为Ni的金属陶瓷的抗热震性优于粘结相为Co的金属陶瓷。显微照片表明,裂纹主要沿硬质相/粘结相界面及粘结相扩展。     

Surface modification of spherical LiNi1/3Co 1/3 Mn1/3O2 with Al2O3 using heterogeneous nucleation process

To improve the cycle stability at high voltage and high charge/discharge rate, spherical LiNi1/3Co1/3Mn1/3O2 was coated with Al2O3 by using heterogeneous nucleation process, and the physical and electrochemical properties were studied. The SEM images show that there is a uniform coating on the modified spherical LiNi1/3Co1/3Mn1/3O2. The electrochemical tests indicate that the properties of LiNi1/3Co1/3Mn1/3O2 coated with 0.5% aluminum oxide are the best. The initial capacities are 150 and 173 mA.h/g at the rate of I C in the voltage range of 2.7-4.3 V and 2.7-4.6 V, respectively, and the discharge capacities maintain about 99% and 85% after 30 cycles, respectively. While those of the bare LiNi1/3Co1/3Mn1/3O2 are only 90% and 75%, respectively. The CV tests of LiNi1/3Co1/3Mn1/3O2 show that Al203-coating can restrain the oxide-reduction peak currents fading during the charge/discharge course.     

Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding

Laser cladding experiments were done on a 5-kW continuous wave CO2 laser to synthesize TiC and TiB rein- fowed titanium matrix composite coatings on Ti-6AI-4V alloy with a mixture of Ti and B4C precursor powder. The ther- modynamics of the reactions were calculated and analyzed. The microstructure and phase evolution of TiB and TiC com- posites were investigated. The results showed that the chemical reaction between Ti and B4C would release much heat, and these compounds, TiC, TiB, and small amount of TiB2, can be formed on the surface of Ti-6AI-4V alloy if the supplied en- ergy is sufficient to excite the reaction among the initial products. A good metallurgical bond between the coating and the substrate can be achieved. The microhardness of coating was irregular and the maximum value was approximately HV600.     

Influence of chromium on the local structure and morphology of ferric oxyhydroxides

The extended X-ray absorption fine structure (EXAFS) method and transmission electron microscopy (TEM) have been used for characterizing the local structure and morphology of ferric oxyhydroxides, α-FeOOH and γ-FeOOH, with and without chromium. These ferric oxyhydroxide powders were prepared from aqueous solutions containing iron and chromium ions. Radial structural functions for iron obtained by Fe K edge EXAFS spectra showed that the linkage of structural units formed by FeO₆ octahedra in γ-FeOOH is distorted by chromium addition, while such distortion in α-FeOOH is not clearly detected. On the other hand, Cr K edge EXAFS spectra showed that the local structure around chromium does not necessarily correspond to the local structure around of iron, which is observed by Fe K edge EXAFS spectra. This suggests that the structural units containing iron and chromium are heterogeneously distributed in these ferric oxyhydroxides. The local structural information was discussed coupled with morphological features of these ferric oxyhydroxides observed by TEM.     

带侧孔塑料斜齿轮注射模设计

以塑料斜齿轮注射模为例,介绍了一种动作可靠,结构简单、新颖的斜齿轮注射模脱模机构,并对塑件成型工艺、模具结构、浇注系统设计、抽芯机构等进行了分析和探讨。     

Identification of the spinel (Cr,Al)3S4 in the internal sulfidation zone of Al-diffusion coatings

The thiospinel (Cr, Al)₃S₄ has been identified in the internal sulfidation zone of Al-diffusion coatings by electron diffraction in a transmission electron microscope. The Al/Cr ratio of this phase can vary over a rather broad range, obviously dependent on the Al/Cr ratio in the surrounding metallic matrix. The spinel can dissolve significant amounts of Ni and Mo, some Co but only traces of Ti. Increasing Al-content extents its stability to higher temperatures.