四角螺母级进模设计

针对零件需多次拉伸、冲孔、翻边、倒角、切边弯曲等工序 ,成功地设计和制造了1副级进模 ,合理地选用了模具材料,满足了四角螺母大批量生产的要求 ,可为类似零件的成形提供参考。     

THEORY DEPOSITION MODEL AND INFLUENCING FACTORS DURING PROCESS OF PREPARING MICRO-LAYER LAMINATE BY EBPVD

This paper briefly introduces the characteristics of electron beam physical vapor deposition (EBPVD) technique and the whole process of preparing micro-layer composite laminate. And several major influencing factors are presented and discussed. It was found that residual gas pressure should be low enough to guarantee the unobstructed transportation of vapor steam and electron beam; the evaporation method and evaporation speed are up to the different vapor pressure deficit of compositions of raw materials; and the substrate temperature could have great influence on the microstructure of the micro-layer laminates.     

TiNb（Y_2O_3）长纤维增强Ti－48Al－2Cr－2Nb合金复合材料的弯曲变形与界面

研究了ＴｉＮｂ（Ｙ２Ｏ３）连续纤维增强Ｔｉ－４８Ａｌ－２Ｇｒ－２Ｎｂ合金复合材料的界面及显微组织。研究发现：复合材料的弯曲强度比基体略有提高，弹性模量和挠度有所下降。在纤维和基体之间形成一层约１０～２０μｍ厚的α２－Ｔｉ３Ａｌ性层，近界面基体组织有片层化倾向。大量变形层错带和孪晶出现及界面位错墙的形成成为塑变及强化的主要机制。     

前驱体酸碱添加剂对溶胶凝胶法制备LiFePO4的影响

溶胶凝胶法作为一种常见的软化学方法用于LiFePO4锂离子正极材料的制备。通过在前驱体中添加盐酸或者氨水，考察不同酸碱添加剂对LiFePO4性能的影响。X射线衍射分析（XRD）和扫描电子显微镜（SEM）用于材料物相及形貌的分析和表征，通过正极材料在空气中加热前后质量差计算得到正极材料中的碳含量。加入盐酸的样品的颗粒尺寸、碳含量及可逆容量得到较为明显的改善，在低充放速率下达到140mAh／g的容量。     

轧制无压烧结铁基干式摩擦材料的研制

研究了铁基粉末冶金摩擦材料的粉末轧制烧结工艺,在轧制前将非金属粉末颗粒用化学镀的方法预先包覆上一层金属铜,再把按比例混制好的多元粉末按一定的轧制工艺要求轧制成带状生胚,然后在真空烧结炉中进行无压力烧结。该种材料经测试其密度为4.9-5.5g/cm^3,μs〉4.5,μd〉0.33~0.40,磨损率≤4.09×10-7cm^3/J,完全可以达到常规法生产的粉末冶金摩擦材料所要求的性能指标,且该工艺方法所需设备和工艺过程相对常规有压法要简化。     

高强度Al-Sn-Si-Cu-Mg轴瓦材料的研究

针对现代发动机向高速、重载、无污染方向发展的需求，研发出了一种新型高承载能力的、无Pb的铝合金轴瓦材料。通过正交试验，分析了添加元素对合金力学性能的影响规律，确定了合金的成分控制范围。试验结果表明：该合金具有显著的时效硬化能力，它在475℃ 0．5h固溶淬火、160℃8h时效后的性能指标可达HV≥70；抗拉强度Rm≥200N／mm^2；伸长率A≥15％。     

254SMo奥氏体不锈钢的焊接

介绍了从瑞典进口的254SMo不锈钢板及其作为复层的复合钢板焊接工艺，并对如何保证焊接质量进行了阐述，该工艺经实践检验切实可行。     

Preparation and electrochemical properties of LiMn1.95M0.05O4 （M=Cr, Ni）

The preparation process and electrochemical properties of LiMn2O4 and LiMnl.95M0.05O4 （M = Cr, Ni） were studied. The results show that the decomposition temperature range of xerogel prepared with lithium acetate and manganese acetate as raw rnaterials is large and the decomposition speed is slow. Oxygen consumed is apt to get a prompt supplement during the preparation of LiMn2O4, and carbonization of the organic matter can be reduced or avoided, which is favorable to the combination of lithium and manganese. Using lithium acetate, manganese acetate, chromium nitrate, and nickel nitrate as raw materials and adopting the citric acid complexing method, it has been found that the prepared powders have high purity, high quality stability, and even doping characters. With the increase of sintering temperature, the particle size and crystal lattice constant of LiMn1.95M0.05O4 （M = Cr, Ni） enhance. However, the purity of the product is relatively high and has no obvious change, which is advantageous to the control of the quality of LiMn1.95M0.0504 （M = Cr, Ni）. Doping with a small amount of Cr3. and Ni^2＋ can stabilize the spinel structure of LiMn2O4, suppress the Jahn-Teller effect, and improve the cycling properties but reduce the initial capacity.     

微米SiCp/Cu基复合材料的组织与性能

以微米级(14／μm)SiCp和微米级(10μm)铜粉为原料，采用冷压烧结方法成功制备出了SiCp／Cu基复合材料，并进行了热挤压加工，研究了组织、导电性能、硬度、拉伸性能和耐磨性能。结果表明：SiCp分布均匀；在SiCp含量为1％vol～10％vol时，SiCp／Cu基复合材料的导电率为95．9％～82．2％IACS．硬度为84．5～89．2HV0.2，抗拉强度为243．3～166．6 MPa，伸长率为50．6％～23．0％；5vo1％SiCp／Cu基复合材料具有良好的耐磨性能，其磨损失重分别是QSn 6．5-0．4的1／18．3和T3纯Cu的1／24.7。     

铸造金属耐磨材料研究的进展

详细介绍了耐磨材料奥氏体锰钢、低合金钢和白口铸铁的成分、组织、性能及其应用进展,还对耐磨钢结材料和耐磨铸造复合材料以及新开发的高硼铸造耐磨合金进行了评述,期待为科学选择耐磨材料提供参考。