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81.
通过对加强环零件的分析 ,确定了合理的加工原材料规格、成形工艺方案和锻模结构 ,解决了原生产过程中存在的材料浪费、加工困难等问题 ,提高了经济效益。 相似文献
82.
J. H. Li P. Deshpande R. Y. Lin 《Journal of Materials Engineering and Performance》2004,13(4):445-450
The objective of this study is to investigate an innovative infrared (IR) technique to enhance adhesion of electroplated copper
(Cu) on Ti-6Al-4V without dichromate dipping. The ultimate goal is to develop a Cu coating process on Ti-6Al-4V without hazardous
hexavalent chromium (Cr) solution treatments. Cu coatings of around 50 μm were electroplated on Ti-6Al-4V specimens at a current
density of 0.03 A/cm2 in an acidic Cu solution. To improve adhesion of coatings, IR heat treatments were performed on the Cu-coated samples at
different temperatures and durations: 860 °C for 600 s and 875 °C for 20–120 s. This process was accomplished in an attempt
to replace the use of dichromate dipping before electroplating. For samples heat treated at 860 °C, no bonding existed, even
after 600 s. It is believed that solid-state diffusion prevailed at 860 °C and that 600 s was not enough for sufficient diffusion
to occur. Adhesion was poor when samples were heat treated at 875 °C for 20 s. Excellent adhesion was observed when the heat
treatment holding time was increased to 40 s. For 90 s, the surface appearance of coatings partially changed from Cu-colored
to a grayish color. There was no Cu left on the surface after a 120 s heat treatment. From optical microscopic observations
on sample cross sections, an interlayer between the Cu and Ti-6Al-4V formed when heat treated at 875 °C for 40 s and longer.
The interlayer thickness increased as the holding time increased, until depletion of Cu. The sheet resistivity of coated specimens
was on the order of pure Cu for samples heat treated at 875 °C and less than 90 s. During the 875 °C heat treatment, the following
occurred: solid-state diffusion of Cu in Ti-6Al-4V, formation of eutectic solutions, dissolution of Cu and Ti-6Al-4V into
the liquid phase, and the formation of intermetallic compounds. The lowest eutectic temperature of 875 °C played a key role
in this innovative process of Cu coating on Ti-6Al-4V.
This paper was presented at the 2nd International Surface Engineering Congress sponsored by ASM International, on September
15–17, 2003, in Indianapolis, Indiana and appears on pp. 403–10 of the Proceedings. 相似文献
83.
介绍了DanieliMorgardshammar公司与Morgan公司提供的线材生产的新设备、新技术。并对其做了分析比较,特别对实现无序轧制多品种生产进行了讨论,指出新型高效线材轧机、高速切头飞剪和相关技术的采用,将推进线材轧制技术的新进展。 相似文献
85.
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87.
Effect of surface modification of metal hydride electrode on performance of MH/Ni batteries 总被引:1,自引:0,他引:1
A novel method was applied to the surface modification of the metal hydride(MH)electrode of MH/Ni batteries.Both sides of the electrode were plated with a thin silver film about 0.1μm thick using vacuum evaporation plating technology,and the effect of the electrode on the performance of MH/Ni batteries was examined.It is found that the surface modification can enhance the electrode conductivity and decrease the battery ohimic resistance.After surface modification,the discharge capacity at 5C(7.5A)is increased by 212 mA.h and the discharge voltage is increased by 0.11 V,the resistance of the batteries is also decreased by 32%.The batteries with modified electrode exhibit satisfactory durability.The remaining capacity of the modified batteries is 89%of the initial capacity even after 500 cycles.The inner pressure of the batteries during overcharging is lowered and the charging efficiency of the batteries is improved. 相似文献
88.
This imaging technique is used for approximate interpretation of TEM data including ungrounded loopsource and grounded line source soundings.Loop source data can be collected as central-loop soundings or asout-of-loop soundings with a short or long offset configuration.The imaging method is based on the same princi-ple as that employed by Fullager(1989),with apparent resistivities computed directly from time-derivative data,db/d,and then associated with depths according to image theory. 相似文献
89.
介绍了几种进口生产线的铁芯冲压工艺和模具结构 ,对进口铁芯的冲压工艺和模具结构进行了分析,给出了适合国内中小企业使用的模具结构和制造工艺 相似文献
90.