镍粉

• Ultrafine nickel powders have been used as catalysts , magnetic materials , sintered activators , electroconductive sizing materials , hard metal adhesives , etc . the research on ultrafine nickel powder is a topic of general interest in the new materials fields at present
  超细镍粉在催化剂、磁性材料、烧结活化剂、导电浆料、电池材料、硬质合金粘结剂等方面具有广阔的应用前景,已成为国内外新材料研究开发的热点之一。
• Recently , as an advanced and eco - friendly method of powder preparation , freeze - drying has been developing quickly . the ultrafine ni powder with the average size of 50nm was prepared by freeze - drying form the niso4 and naoh and was studied by means of xrd , ir , fesem , tem , and dsc . the catalysis of nickel powders to nh4clo4 and how the precursor forms and the processes of the amorphous precursor to the final nickel powders are discussed
  本论文以分析纯niso4 、 naoh为原料,采用冷冻干燥技术成功的制备了50nm左右的球状超细镍粉,通过xrd 、 ir 、 fesem 、 tem 、 dsc等材料现代分析手段对产物进行了分析和表征,研究了超细镍粉对高氯酸铵热分解的催化活性、前驱体的形成以及非晶态金属盐到晶态超细镍粉的转变过程。
• At the beginning of the reduction , the spherical ni powders precipitated at the tip of the precursor where specific surface energy is higher , then more and more ni powders appeared at the edges and the surface of the precursor ; finally the spherical ultrafine ni powders take the place of the whole precursor
  在还原过程中,超细镍粉首先从冻干前驱体的尖端等比表面能较大的地方析出;随后前驱体的棱和表面逐渐析出大量的超细镍粉;最后镍粉颗粒替代整个前驱体,得到球状超细镍粉。
• The second strategy include that a metallic nickel ( ni ) core was encapsulated with a polymeric polystyrene ( pst ) , and then coated with an outlayer of dielectric titania to form ni / pst / tio2 composite particles . the morphology and structure of the particles were characterized by tem , sem , tg - dta , xrd , and ft - ir
  其次，以聚苯乙烯包覆金属镍粉，形成了ni pst磁性聚合物微球，然后在该微球外包覆二氧化钛，制得了粒径均匀、形态良好的镍聚苯乙烯二氧化钛( ni pst tio _ 2 )无机-有机结构的多层核-壳复合微球。
• Nanyang fusen magnesium powder limited company of henan is a current local biggest scale base which produces all species of magnesium powder , inactive magnesium powder , aluminum magnesium metal alloy powder , aluminum powder , copper powder , the powder of nickel , zinc powder , molybdenum powder etc . nonferrous metals powder series and every kind of profession that reunites the metal alloy produces , it owns fixed assets 30 , 000 , 000 dollars and the
  河南省南阳福森镁粉有限公司是目前国内规模最大品种最全的镁粉钝化镁粉铝镁合金粉铝粉铜粉镍粉锌粉钼粉等有色金属粉末系列及各种复合合金的专业生产基地。拥有固定资产3000万元，员工500人其中中高级工程技术人
• The results show that : nano - nickel powder is not useful for mh electrode during the high rate discharge phase as a conductor or additive ; superfine nickel powder is applicable for the conductor of the negative because of the good performance especially the cyclic stability at 1c rate by using 5 % ( mass percentage ) nickel powder ; the utilization of alloy , specific mass and volume capacity are increased with the decreased particle size of nickel powder in negative , however , the capacity fading rate at 1c discharge rate is also increased , so the capacity and the cyclic stability should be taken into account to make a choice of the particle size
  结果表明： mh电极中加入纳米镍粉对负极的大电流放电性能不利。 mh电极中加入超细镍粉后电极综合性能好，尤其是1c循环稳定性，其最佳添加量为5wt 。减小镍粉粒度提高了电极合金利用率、质量比容量、体积比容量，但增大了负极1c容量衰减率，因此镍粉粒度的选择应综合考虑mh电极容量和循环稳定性。