激光快速成形Ti-6Al-4V合金力学性能

采用实验研究的方法，对激光快速成形Ti-6Al-4V合金的力学性能进行了探讨。结果发现：和锻造件相比，激光快速成形沉积态Ti-6Al-4V合金的拉伸性能具有高强低塑特点和更显著的各向异性；成形试样的组织、氧含量和冶金缺陷都将影响到拉伸性能，其中组织的影响最显著，其次为氧含量和熔合不良缺陷：对于氧含量符合GJBGJB2921-1997标准的激光快速成形Ti-6Al-4V合金，经固溶时效热处理后所获得的网篮组织综合性能最好，不论是强度指标还是塑性指标都高于锻件标准。     

Si复合Al2O3-SiC材料热机械性能的研究

通过应力-应变关系、高温抗折强度等高温试验，研究了金属硅复合Al2O3-SiC材料的热机械性能，结合SEM和XRD，对金属硅复合Al2O3-SiC材料高温显微结构和物相进行分析。结果表明：金属硅作为一个组元，不仅能缓解Al2O3-SiC材料由于热膨胀系数不匹配产生的内应力，而且使Al2O3-SiC材料兼具有金属塑性的特点，从而改善了Al2O3-SiC无机材料热机械性能。     

6061铝合金花键壳体冷挤压工艺研究

针对冷挤压工艺生产6061铝合金花键壳体容易产生表面裂纹、拉伤等问题,进行了详细的工艺分析,并利用有限元法进行了成形模拟,揭示了缺陷产生的原因,优化了模具结构和成形方案.同时,从生产实际出发,改进了毛坯表面处理方法及润滑措施.结果表明,该改进措施能有效解决零件的质量问题,最终生产出合格产品.     

Subsolidus phase relation in the system ZnO–Li2O–MoO3

The subsolidus phase relation of the system ZnO–Li₂O–MoO₃ has been investigated by X-ray diffraction (XRD) analyses. The phase diagram has been constructed. There are six binary compounds and one ternary compound in this system. The phase diagram comprises nine three-phase regions. The ternary compound Li₂Zn₂(MoO₄)₃ is refined by the Rietveld method. It belongs to an orthorhombic system with space group Pnma and lattice constants a = 5.1114 Å, b = 10.4906 Å, c = 17.6172 Å.     

数控机床可靠性评价方法的研究

根据所获得的数据处理方法的不同,分别采用修正极大似然法和序贯压缩相结合的方法、指数寿命型串联系统的CMSR法、基于信赖方法的数控机床可靠度分析法对数控机床的各子系统进行可靠性评价.评价结果表明:第一种的准确度较第二种更高,表明将数控机床的各个单元看成是成败型较指数型更合理;在数据充分的情况下,采用基于信赖方法的数控机床可靠度分析方法更为合理.     

X65MO海底管线钢包辛格效应研究

海底管线钢管强度是包辛格效应和形变强度共同作用的结果。采用MTS材料试验机、扫描电镜和透射电镜，研究了不同预压变形量下X65MO海底管线钢的包辛格效应。研究结果表明，预压变形量在0~0.85%时，包辛格效应占据主导作用，X65MO钢管的屈服强度较原料带钢的低，当预压变形量约为0.30%时，屈服强度下降值达到最大约30 MPa；预压变形量在085%~1.50%时，形变强化效应占主导作用，X65MO钢管的屈服强度较原料带钢的高。随着预压变形量的增加，X65MO钢晶粒内部形成的稳定位错亚结构增多，并且第二相粒子对位错钉扎作用更加显著，导致了宏观上钢管屈服强度的增加。     

A brief review of brazing diamond in cutting tools

Diamond has high hardness and good wear resistance. It is widely used in cutting tools and workpieces. Brazing is an effective method to realize high quality cemented carbide joints in various materials connection technologies. This paper analyzes the research status of diamond brazing in detail. The materials used as brazing filler in diamond brazing are reviewed. Copper base filler and nickel base filler are the most commonly used brazing filler in diamond brazing. The advantages and disadvantages of diamond grinding tools under different production methods are analyzed. In addition, a series of new brazing alloys such as amorphous Ni based brazing filler metals are analyzed. Finally, the development trend of diamond brazing is pointed out.     

外胎外观质量与B型双模定型硫化机的关系

结合４２ｉｎＢ型双模定型硫化机，分析了轿车子午胎的胎趾不全、胎里夹沟、钢丝圈上抽、欠硫、胎体变形、胎冠胶边、胎里起凸及胎圈弯曲等外观质量问题，主要探讨了硫化机设备对外胎外观质量的影响并提出了解决措施。     

Studies of polyimide/copper interface and its improvement by a two-component primer

The inhibition of the imidization of polyamic acid, a precursor of polyimide, in the presence of Cu, was confirmed by the incorporation of Cu²⁺ ions in polyamic acid films. It was found that the imidization reaction was incomplete below 300°C but decomposition took place when heating above 300°C. Pretreating the Cu surface with a two-component primer solution containing polybenzimidazole and 2-mercaptobenzimidazole can make the imidization proceed without retardation and avoid the decomposition above 300°C. By choosing appropriate surface treatment systems, one can achieve the improvement of adhesion between PI and Cu substrate.     

RE对ZA43合金组织、力学性能及抗磨性的影响

通过RE对ZA43合金进行变质处理,研究了该合金的显微组织、力学性能及抗磨性能。结果表明,在ZA43合金中加入适量RE,能有效地阻止树枝状晶长大,优化组织结构,细化晶粒,使合金的抗拉强度提高20%、硬度提高10%,抗磨性能也大幅度改善。这为进一步改善该合金的力学性能及抗磨性能提供了一条有效途径,从而使锌合金代替铜合金成为可能和现实。