共查询到20条相似文献,搜索用时 62 毫秒
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针对兵器某飞行智能产品中所用高强度钢滑动零件化学镀镍磷合金难施镀及镀层性能差的特点,从材料特性与化学动力学的相互关系出发,运用正交试验和均匀试验,获得了适合于高强度钢的中温化学镀镍磷合金工艺技术,并顺应“清洁生产”的发展趋势。通过研究镀液主盐含量及比值、络合剂、加速剂、稳定剂、温度、pH值等因素对沉积速度、镀层耐蚀性与耐磨性的影响,解决高强度钢零件化学镀镍磷合金难施镀、镀层易起皮、结合力差、镀层耐蚀性与耐磨性匹配性差等问题。靶试及库存结果表明:该工艺技术获得的镀层性能良好,耐蚀性与耐磨性实现了最佳匹配,可为兵器装备高硬材料化学镀提供技术参考,尤其在复杂多变的环境下服役的智能化产品滑动零部件上,具有广阔的应用前景。 相似文献
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热处理对铝合金化学镀镍-钨-磷镀层组织性能的影响 总被引:3,自引:0,他引:3
通过扫描电子显微镜、能谱微区成分分析、透射电镜等手段研究了热处理对6061铝合金化学镀镍-钨-磷合金镀层组织性能的影响.结果表明:在试验热处理条件下,镍-钨-磷镀层和基体问扩散主要是镍原子向铝基体中的扩散;铝合金化学镀镍-钨-磷试样525℃热处理1 h后,由于镍原子的扩散,基体和镀层之间形成镍铝合金层,镍铝合金层分为二层,第一层镍铝合金层主要含有Ni2Al3相,第二层镍铝合金层主要含有NiAl3相;在干摩擦滑动条件下,铝合金化学镀试样经525℃热处理1h后表现出良好的耐磨性. 相似文献
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介绍了一种新型表面处理工艺———深冷处理化学镀镍磷复合处理工艺。经该工艺处理后,工件的基体组织得到细化,同时可以获得与基体结合牢固的耐磨、耐腐蚀表面合金层,充分改善了材料的组织和性能。 相似文献
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电镀法石墨粉镀铜工艺及铜含量的测定 总被引:3,自引:0,他引:3
采用电镀法对石墨粉进行了镀铜,研究了镀铜过程中浓硫酸及石墨粉的加入量、电流密度和电镀时间对镀铜效果的影响,并研究了镀铜石墨粉中铜含量的测定分析方法.结果表明:在800 mL蒸馏水中加入8 g CuSO4·5H2O和20 mL浓硫酸及5 g处理过的石墨粉,每5~10 min搅拌0.5 min,镀铜电流密度9 A·dm-2(或21 A·dm-2),时间为60 min(或20 min),石墨粉镀铜效果较好.镀铜石墨粉在900℃充分氧化后通过氧化前后质量计算可求得其中的铜含量. 相似文献
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简述了铜及铜合金浮动盘管的设计和应用 ,详尽地介绍了铜及铜合金浮动盘管的制造工艺和主要工装的设计要点 ,对生产浮动盘管换热器的厂家有一定的参考价值。 相似文献
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本文通过工程实例,介绍电解池组的阴阳两极采用大型铜母排组合焊接的制作施工技术,并对施工制作过程中铜材变形与温度等有关特性参数的控制进行探讨. 相似文献
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This paper presents an experimental study correlating frictional behavior with in situ voltammetry for a unidirectional sliding
contact between a hemispherical tipped alumina probe and a flat rotating copper counterface (maximum Hertzian contact pressure
of 68 MPa and sliding speed of 10 mm/s). The contact was immersed in an aqueous 0.1 M Na2CO3 solution (pH ∼11) where the copper counterface acted as the working electrode in a potentiostat controlled three-electrode
cell; a coiled Pt wire was used as the counter electrode and a saturated calomel electrode (SCE) as the reference. Clear and
reproducible trends were found between friction coefficient and published data suggesting the onset of particular redox reactions,
graphically presented in a frictional voltammetry plot. At anodic potentials primarily associated with the formation of copper(I)
oxide (Cu2O) (V vs SCE ∼−0.25), the measured friction coefficient was in the range μ ∼0.4–0.5. At cathodic potentials primarily associated
with the formation of CuO, Cu(OH)2, and CuCO3 (V vs SCE ∼−0.10), the friction coefficient transitions to the range μ ∼0.7–1.0. At sustained cathodic potentials associated
with reduction of the native copper oxide, Cu2O, (V vs SCE ∼−0.65), the friction coefficient is observed to fluctuate between μ ∼0.2 and 0.5, arguably a result of exposure
of bare copper due to non-uniform reduction (fractional coverage) of Cu2O. 相似文献
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The frictional and wear characteristics of electrified copper sliding against a QCr0.5 copper alloy under moist and dry conditions were investigated utilizing a special pin-on-disc apparatus. Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) were used to observe the morphology of the copper pin contact surface and analyze its compositions, respectively. The results indicate that the wear rate and frictional coefficient of the copper are reduced as a result of the cooling and lubricating effect of water compared with dry sliding condition. However, both the frictional coefficient and wear rate of the copper material increases with an increase in electrical current under either moist or dry conditions and the frictional coefficient varies within narrow limits under wet conditions. In addition, there is a greater amount of oxygen associated with the surface under wet conditions than dry. 相似文献
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