共查询到16条相似文献,搜索用时 93 毫秒
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以CuSO4为原料,对用NaOH沉淀一葡萄糖预还原一水合肼还原工艺制备的超细铜粉进行了研究.结果表明:葡萄糖预还原和分步添加水合肼均有利于超细铜粒子的均匀生长,加入适量的PVP有助于超细铜粉颗粒均匀和球形度更高.用该工艺可制得粒度均匀且可控、分散性好的MLCC电极用球形超细铜粉. 相似文献
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对电极用超细铜粉的制备方法进行了介绍和评述。指出球形超细铜粉有助于制备优质电极, 超细铜粉通过表面改性可以显著提高抗氧化性。 相似文献
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采用高能球磨对铜精矿进行活化预处理, 并通过超声场辅助矿浆电解的方法直接利用铜精矿制备出平均粒度小于10 μm的超细铜粉。超细铜粉经油酸和丙酮的表面改性处理后, 抗氧化性能得到提高。 相似文献
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在测量超细铜粉Zeta电位的基础上,本文选用SHMP,OA,SDBS,PVP,PEG五种分散剂,系统研究了超声时间和分散剂浓度对超细铜粉在无水乙醇中分散性能的影响,进而又研究了超细铜粉的加入量、粒径大小、不同粒径铜粉复配等对导热硅脂导热性能的影响。实验结果表明,在无水乙醇中添加3wt.%的六偏磷酸钠超声50min,铜粉分散效果最好;随着超细铜粉添加量的增加和粒径的增大导热膏的导热系数均先增大后减小;当超细铜粉的总加入量为33wt.%, 且82nm和800nm的铜粉以3:1进行复配时,导热膏的导热系数最大为1.413 W/m.K,其导热性能最优。 相似文献
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以维生素C为还原剂合成超细铜颗粒.利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对所得产物的晶型和形貌进行表征.结果表明,以维生素C为还原剂,还原CuSO4制备的不同形态铜粉为超细纯铜.最佳制备条件为:铜盐为硫酸铜,原料配比(硫酸铜与维生素C的物质的量之比)为1∶1.2,铜离子浓度为0.1 mol/L,时间为3h,温度为20~25℃,分散剂为聚乙二醇-4000.加入的聚乙二醇-4000仅仅作为分散剂,对产物纯度无影响,且可以避免产物的团聚,使得产物颗粒更小,更均匀. 相似文献
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化学还原法制备纳米铜粉 总被引:12,自引:0,他引:12
采用硼氢化钾还原CuSO4的方法,控制反应物摩尔比为n(CuSO4):n(KBH4):n(KOH)=2:1:10,再辅以一定量络合剂EDTA和分散剂NP,可以制备分散性良好、粒径约20nm的铜粉。 相似文献
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1IntroductionAs ani mportant raw material of powder metallurgy products,copper powder plays a vital role in in-dustrial fields.There are many methods for preparation of copper and copper based powder as follows[1-5]:electrolytic technique,gas-reduction technique,atomization machanical smashing,permutation,high-pres-sure hydrogen reduction,microbe lixiviation,and so on.Recently,high energy ball millingis used widelyin preparation and sythesis of materials such as dispersion intensified alloy ma… 相似文献
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LIU Wei-ping HUANG Lin YIN Yan-hong 《材料研究与应用》2005,(3):533-536
In the study, the common copper powder is used as sample, the ultrafine copper powder is researched by a new process of high energy ball milling. The influence of the milling time, the milling intensity, the milling medium, the ratio of hall to material, the dry milling and the wet milling on copper powder size are studied and the rule of every factors influencing properties of copper particle size and specific surface area under the best experimental conditions are acquired. By the regressive analysis of experimental results under the best conditions, the characteristic equation of copper particle prepared by high energy milling is confirmed. 相似文献
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In the study, the common copper powder is used as sample, the ultrafine copper powder is researched by a new process of high energy ball milling. The influence of the milling time, the milling intensity, the milling medium, the ratio of hall to material, the dry milling and the wet milling on copper powder size are studied and the rule of every factors influencing properties of copper particle size and specific surface area under the best experimental conditions are acquired. By the regressive analysis of experimental results under the best conditions, the characteristic equation of copper particle prepared by high energy milling is confirmed. 相似文献
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