共查询到17条相似文献,搜索用时 62 毫秒
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综述了多层陶瓷电容器内电极浆料用球形纳米镍粉的制备方法,这些方法包括液相化学还原法、喷雾热解法、多元醇法、等离子体法、羟基镍法等。介绍了MLCC用纳米镍粉的表面改性技术,并提出了MLCC用球形纳米镍粉的发展方向。 相似文献
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微细镍粉的制备技术及研究进展 总被引:1,自引:0,他引:1
微细镍粉具有极大的表面效应和体积效应,在磁性、内压、热阻、光吸收、化学活性等方面显示出许多特殊性质.作为一种新型材料,在催化剂,电源电极材料,多层陶瓷电容器,导电性纤维,硬质合金材料,吸收材料等方面具有广阔应用前景,已成为国内外新型功能材料开发的热点之一.本文介绍了微细镍粉的物理、化学性能、应用领域及发展前景,并介绍了微细镍粉的制备技术及其研究进展. 相似文献
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需要对还原工艺参数进行严格控制,以满足新材料对微细镍粉粒度、松装密度、氧含量的要求。利用氢还原技术,采用推舟炉进行试验,研究了不同条件下喷雾热解氧化亚镍粉的氢还原效果。结果表明,采用推舟炉还原喷雾热解氧化亚镍生产微细镍粉的最佳工艺条件为:还原温度745~800℃、推舟时间1 200s、氢气流量7.5m~3/h。所制得的还原镍粉松装密度低、粒度细,氧含量可低至0.25%。 相似文献
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The magnetic properties (magnetic induction and coercive force) of iron powder coated with nickel and cobalt as a result of chemical deposition from hypophosphite electrolytes are studied. Thermogravimetry, differential thermal and x-ray phase analyses are used to study in detail the kinetics and mechanism of high-temperature oxidation in air (up to 1200°C) for the original and coated powders. The phase composition of oxide films on specimens annealed at all temperatures of the DTA-curve peaks is determined. The possibility of increasing the high-temperature oxidation resistance of iron powder coated with nickel or cobalt is demonstrated. 相似文献
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AbstractWhen nickel powders produced by precipitation are heated at elevated temperatures, cracks and voids form within the particles causing them to swell. This swelling has been correlated with the liberation of gases generated by trace impurities in the metal. Using gas volumetric, gas density balance, infrared, and microchemical analyses, carbon dioxide and nitrogen have been identified as the gases mainly responsible for the swelling when the powders are heated in nitrogen. On the other hand, hydrogen sulphide has the major influence when they are heated in hydrogen. 相似文献
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钼粉制备技术直接影响到钼粉的品质,而钼粉的品质则影响钼及钼合金的性能,因而钼粉制备技术备受业界关注。主要介绍了工业化钼粉的传统制备方法,如氢气还原法、等离子还原法、羰基热分解法、溶胶-凝胶法,以及特殊用途的超细钼粉、纳米钼粉、高纯钼粉的制备方法。文章指出了各种钼粉制备技术的优缺点,以及所制得钼粉品质,并讨论了一些制备技术中的关键影响因素、过程机理。总之,选用不同的制备方法,可生产出满足各种需求的、性能和质量各异的钼粉产品。提高钼粉的纯度、产出率、生产效率、降低生产成本、发展特种制备设备,是钼粉制备技术的发展方向。 相似文献