等离子喷焊铜基自熔性合金的研制

为了克服铜铁异种材料喷焊过程中易产生焊缝裂纹和基体裂纹的倾向,研制开发了一种Cu-Ni-Sn自熔性合金粉末材料.通过对Cu-Ni-Sn粉末材料的化学成分的设计,喷焊层的组织显微结构及抗腐蚀性能的综合分析,认为该材料等离子喷焊工艺性能良好,焊层耐腐蚀效果十分明显.在生产实际中应用等离子喷焊制备Cu-Ni-Sn焊层,能明显提高粉末材料的熔敷率和性能,并且改善劳动工作环境.该合金性能优于传统材料,值得推广.     

Microstructure developed in the surface layer of Ti-6Al-4V alloy after sliding wear in vacuum

Microstructural changes in the surface layer of Ti-6Al-4V alloy after sliding wear in vacuum have been studied by means of scanning and transmission electron microscopy (SEM and TEM). The wear rates of Ti-6Al-4V alloy in vacuum were measured under different sliding velocities and loads. The experimental results showed that a severely deformed layer with a grain size of 50–100 nm and thickness about 70 μm was formed underneath the worn surface. Under the slower sliding velocities, the substructure of the layer had a high dislocation density, while under higher sliding velocities, twins were found to exist in the substructure. A process by which the deformed layer formed has been proposed and the deformation of materials at the contacting spots of the Ti-6Al-4V sample is discussed.     

非晶Mg65-xNi21Pr14Agx合金电极的制备及其放电性能

用铜模喷铸法制备了非晶Mg65-x Ni21-Pr14Ag x合金,采用球磨方法细化了合金颗粒。系统研究了不同Ag含量对非晶合金电极充放电行为、放电容量、循环稳定性、高倍率放电等性能的影响规律。结果表明,Ag元素的添加改善了合金电极充/放电性能,随着Ag含量的增加,非晶合金电极的最大放电容量和循环稳定性均呈现先增大后减小的规律,其高倍率放电性能也有所提高,适量Ag的添加可明显改善非晶MgNi-Pr系合金的放电性能。     

枪黑色Sn-Ni合金在NaOH溶液中的析氢电催化性能

为了降低电解制氢的电耗,提高经济效益.作者对枪黑色Sn-Ni合金在NaOH溶液中的析氢电流化性能进行了研究.试验测出的电化学参数表明,在NaOH溶液中电解制氢时,枪黑色Sn-Ni合金的析氢电催化性能比45钢和高硫镍的强很多,而且具有很高的电化学稳定性.用它取代目前工业上使用的45钢和高硫镍作为电解制氢的阴极,可显著降低制氢的生产成本.     

两种不同焊丝对7A05铝合金焊接性的影响

选择两种焊丝,对Al Zn Mg系合金7A05 T6进行焊接性研究。焊接裂纹试验结果表明,采用两种焊丝焊接7A05合金时,接头均具有较好的抗热裂纹敏感性。两种焊丝焊接接头的拉伸强度均为母材强度的75%以上,经过时效处理的焊接接头力学性能有了明显的提高。分析认为微观组织中沉淀物质点越小,均匀分散到晶界上越多,接头的拉伸强度越高。     

Annealing process of fine grained co-stabilised (Y,Mg)-PSZ/MgAl2O4 ceramics

Abstract

Co-stabilised (Y,Mg) partially stabilised zirconia (PSZ) ceramics with MgAl₂O₄ spinel additions were produced, with industrial zirconia as the main starting material. Powders were prepared using a mechanical milling–mixing process. The effect of the annealing process on the mechanical properties, phase compositions, and microstructure of fine grained PSZ ceramics was investigated.     

铝合金熔剂的研究

本文介绍了熔剂在铝合金熔炼过程中的作用,熔剂的分类和要求,常用熔剂的组成,适用范围及使用方法等。     

Mg-Ca-Mn、Mg-Ca-Sr三元生物镁合金制备与研究

为了改善Mg-Ca二元生物镁合金的力学性能和体外降解性能,分别制备了Mg-Ca-Mn和Mg-Ca-Sr三元合金,比较了3种合金的显微组织、力学性能及在Hanks溶液中的降解性能.实验结果表明,Mg-Ca-Sr合金的力学性能和体外降解性能较好,抗拉强度为230MPa,析氢腐蚀速率为0.042 mL/(d·cm2).     

铝合金表面搅拌摩擦加工技术的研究进展(Ⅰ)

以搅拌摩擦加工原理为基础,概述了近年来铝合金表面搅拌摩擦加工处理中的细化晶粒与消除铸件内部缺陷的应用,分析了该技术用于铝合金性能(如表面硬度、强度、耐磨性能和超塑性等)改善的机理,展望了搅拌摩擦加工技术在铝合金表面处理中的应用前景。     

55t均火炉的温度检测及铸锭均火工艺参数确定

介绍新建的均匀化退火炉的空炉温度和带料温度测试,以及铸锭均火工艺参数的制定方法,并指出确定铸锭均火工艺参数的原则。