共查询到18条相似文献,搜索用时 125 毫秒
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首饰用千足硬金是近年来珠宝市场上出现的新品种,其硬度是普通千足金硬度的2~3倍,具有纯度高、耐磨性好、可塑性强的优点.目前市场上硬金产品的生产工艺主要分为电铸法和熔金冶炼法两种,但就其具体的工艺而言,商家一直秘而不宣.笔者在查阅了大量相关文献的基础上,借鉴其他金属材料学科提高材料硬度的手段,提出了通过黄金时效强化、黄金表面覆TiN膜等生产硬金的可行性新方案,希望能为以后的研究者研究硬金制造工艺提供一个参考. 相似文献
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介绍了电铸样块生产工艺,通过对电铸镍电解液各组分的工艺性能分析,选择较适合的电解液配方及工艺参数,使各数值的控制产生较小的内应力,满足电铸样块达到不同粗糙度的要求,并且具有加工精度高、溶液不易老化及电铸样块不易变形的特点. 相似文献
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《化学世界》1966,(3)
一、言前随着工业生产的飞跃发展,模具制造在工业中所起的作用日益显得重要。电铸模具在我国是一门新兴的工艺,它不仅在国防、精密仪器仪表制造和一些轻工业产品制造上解决了几何形状特殊和形腔复杂模具的制造而且缩短了开模时间。目前一般常用的电铸工艺有电铸镍、铜等。电铸镍模不但光洁度、精密度好而且硬度高。可是由于价格昂贵,不能满足工业上的需要。如果采用先电铸一薄层(约0.8~1毫米)镍,再用镀铁来电铸加厚,则不但节约了大量贵重的镍,并且缩短了电铸周期,而且对模具硬度和耐磨度均无影响。如果不先电铸镍而直接以镀铁来电铸模具,然后进行热处理来提高硬度和耐磨度的话,那末其所起作用和经济意义就更大了。 相似文献
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《电镀与精饰》1986,(3)
一、概述电铸生产,尤其是精细花纹版电铸,时常出现一些故章,如以化学镀银层作为导电层的塑料模电铸有时发生铸件表面线条短缺或线条轮廓粗糙不齐的问题;以蛋白做隔离层,以铜或银为表面的金属模电铸有时又会发生粘连铸模,脱模困难,甚至造成原模式铸件的变形;用金属模电铸镍版,脱模后有时发现铸件表面局部有“毛刺”等。版面越大,上述故障越容易发生。研究证明,这些故障却是由于电铸沉积层内应力太大造成的。二、实验和结果1.电铸液特性试验在烧杯中用各种不同溶液(800ml)进行了多次电铸镍版实验。模版是紫铜版,面积0.2dm~2,版面中间有深度和宽度都在几十微米范围的线条花纹,整个版面用氰化银液置换一层银,银面上浇以 相似文献
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0 前言 电铸能制造某些难以用一般机械加工方法制造的特殊形状的零件.通过合理的芯模设计,选用恰当的工艺,可制造出精度高、表面粗糙度低的零件[1].我单位生产的表面粗糙度比较样块是以电铸镍的方法使用硫酸盐-氯化物配方进行复制的.在电铸过程中经常出现掉边、划伤、变形、发花等故障.其中,样块表面发花故障时常发生,有时较容易排除,有时因其影响因素较多,难以彻底排除. 相似文献
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在弱酸性氰化亚金钾电铸溶液中加入少量(0.3~0.6 g/L)氰化钴钾,电铸黄金工艺品的硬度达到155~185 HV,与传统产品相比增加了100 HV.电铸工艺品硬度及黄金成色都采用相关的国际标准测定.实验结果表明,黄金铸件的硬度先随氰化钴钾加入量的增加而提高,当氰化钴钾加入量为0.4 g/L时达最大值,而后趋于稳定;Co3 含量在0.008%~0.03%之间时,黄金产品的成色没有影响;加入钴离子后,产品成品率明显增加到76%~92%.该工艺可以显著提高黄金工艺品的质量与产量,节省黄金原料,具有很高的实用价值. 相似文献
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The magnetic properties of nickel deposits are known to be related to their crystallographic textures. Although there has been significant work investigating the relationship between crystallographic textures and magnetic properties of sputtered ferro-magnetic films, relatively less effort has been spent on studying electroformed nickels. Orientation distribution functions and coercivity of the nickel deposits, electroformed by using a nickel sulphamate bath and pulse-reverse currents, have been determined and their relationship examined. It was found that the [100] fibre texture with different orientation densities was formed at different on-times and off-times, and that at the same deposition thickness the coercivity increased with increase in the orientation density of the [100] fibre texture. This findings are of high significance as they can serve as guidelines for the production of nickel deposits with defined magnetic properties through the control of crystallographic te xture by varying the pulse parameters in pulse-reverse current electroforming. 相似文献
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采用3D打印的圆柱体作为芯模电铸铜,得到小直径薄壁回转体零件。配方和工艺条件为:CuSO4·5H2O 200 g/L,浓硫酸60 g/L,Cl-0.05 g/L,pH 1,温度26℃,极间距3 cm,电流密度2~8 A/dm2,阴极表面线速率3.14~12.56 mm/s。研究了电流密度和阴极表面线速率对电铸铜表面形貌和显微硬度的影响。随电流密度或阴极表面线速率增大,电铸铜的晶粒得到有效细化,组织更均匀、致密,显微硬度先增大后减小。电流密度为4A/dm2,阴极表面线速率为9.42 mm/s时,电铸铜的表面形貌最好,显微硬度最高,所得回转体零件表面光滑、平整,厚度均匀。 相似文献
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Stephen H. F. Lai Joseph A. McGeough 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1980,30(1):7-13
A process for the high-speed electroforming of iron foil is described. The electrolyte can be operated over a current density range of 10–100 A dm?2. The quality of the electroformed iron foil is dependent upon process variables, and in terms of its main mechanical, electrical and magnetic properties, is comparable with that of many conventionally-produced metal foils. 相似文献
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《Electrochimica acta》2001,46(1-2):143-148
We developed an electroformed copper lining for RF cavities. The pure copper lining with mirror-finish surface was produced by electropolishing the machined surface of an electroformed copper layer obtained from an acid copper sulfate bath containing no organic additives. The copper lining was successfully applied to large RF cavities for the Japan Hadron Facility being constructed by the High Energy Accelerator Research Organization. Dramatic rise in accelerating performance was achieved by this new lining. 相似文献
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Noriyuki Yamachika Junji Sasano Masaru Kato Tetsuya Osaka 《Electrochimica acta》2008,53(13):4520-4527
It was found that, by choosing an optimum bath composition, amorphous Au-Ni alloy containing up to 40 at.% of Au with respect to the sum of Au and Ni can be electrodeposited from a bath prepared by excluding tungsten from the Au-Ni-W bath that we developed previously. Elemental analysis showed that the deposit contains 15-20 at.% of carbon and 2 at.% of nitrogen. Hardness of this deposit is almost three times as high as that of the conventional hard gold. The electrical contact resistance measured against a pure gold wire is comparable to that of the hard gold. The amorphous structure of the Au-Ni deposit is stable at temperatures up to 300 °C for at least 1 h. The amorphous tungsten-free Au-Ni deposit is worthy of consideration for applications in the fabrication of micro- and nano-scale electrical contacts. 相似文献
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采用电铸技术制造定向反射镜芯模,与精密机械加工方法相比,电铸法具有加工精度高,能完全复制形状复杂而且具有不同粗糙度的表面,加工成本低,适于大批量生产,介绍了电铸法制造定向反射镜芯模的表面准备以及电铸工艺中的一些特殊问题。 相似文献