共查询到18条相似文献,搜索用时 109 毫秒
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电刷镀过程中产生的应力影响镀层及基体金属材料的一系列物理、化学和力学性能,例如降低了材料的耐蚀性和抗疲劳性能,影响沉积金属的耐磨性、硬度、导磁和导电性等。研究内应力的主要是在于获取小应力和无应力镀层。本文分析了镀层内应力产生的机理以及影响因素,提出了降低镀层内应力的一些方法。 相似文献
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采用电刷镀技术在超纯气体发生器的水解电极表面制备纯金属镍镀层,具有工艺简单、优质高效的特点。阐述了电刷镀技术作为零部件局部表面功能性镀层制备手段的独到之处。 相似文献
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复合镀层电刷镀工艺的研究 总被引:2,自引:0,他引:2
在电刷镀溶液中加入一定数量的一种或几种不同溶性固体非金属颗粒,通过电刷镀工艺沉积而获得硬度较高,耐磨,耐蚀,自润滑的复合镀层。在天龙4#-4快速镍刷镀液及天龙6#-6非晶态镍磷合金镀液的基础上,就其镀液组成,添加剂等条件进行了试验,选择,并对加入的固体颗粒的分散数量,颗粒径的大小进行了试验,确定了工艺参数,形成了完善可行工艺。 相似文献
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研究了电刷镀Ni-P合金镀层的制备工艺,检验服镀层的耐蚀性和硬度等性能。结果表明Ni-P合金镀层具有优良的耐蚀性,并成功地获得了耐磨复合镀层。 相似文献
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本研究获得了Ni-Co-Mo微晶态电刷镀层的优化脉冲工艺参量,并对用脉冲工艺得到的刷镀层与用直流工艺得到的刷镀层进行了性能比较。结果表明:在优化脉冲工艺参量范围内,脉冲电刷镀内应力比直流电刷镀层的内应力小,前者表面裂纹少,孔隙率低,耐蚀性好。 相似文献
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A membrane deflection technique has been developed to measure the isotropic residual stress in biaxially-constrained coatings. The technique has been demonstrated on various materials, including polyimide, latex rubber and photoresist coatings. Stress values obtained from membrane deflection compared well with results obtained from time-averaged vibrational holographic interferometry except for values obtained from samples where rigidity effects were found to be important. A criterion based on the thickness, rigidity, stress and sample radius is also discussed, establishing the applicability of the technique to samples of low rigidity. 相似文献
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A membrane deflection technique has been developed to measure the isotropic residual stress in biaxially-constrained coatings. The technique has been demonstrated on various materials, including polyimide, latex rubber and photoresist coatings. Stress values obtained from membrane deflection compared well with results obtained from time-averaged vibrational holographic interferometry except for values obtained from samples where rigidity effects were found to be important. A criterion based on the thickness, rigidity, stress and sample radius is also discussed, establishing the applicability of the technique to samples of low rigidity. 相似文献
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换向脉冲电镀工艺对镀镍层应力的影响 总被引:1,自引:0,他引:1
本文采用正交实验及其分析方法研究了可调周期换向脉冲电镀工艺对瓦特镍镀层应力的影响,确定了脉冲镀镍的新工艺。与相同电流密度条件下直流镀瓦特镍层的性能相比,该工艺镀出的镀层具有应力低、孔隙少、结晶细、平整度好、纯度高的特点,是解决半导体外壳外引线断裂问题的很有前途的电镀新方法。 相似文献
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介绍了Ni-P基纳米复合镀层的研究现状,分析了不同纳米颗粒对镀层性能的影响,并指出了其研究方向。 相似文献