Plating of Ni/c-BN composite film in two steps
Plating of Ni/c-BN composite film in two steps
复制标题
两步镀Ni/c-BN复合薄膜
DOI：
10.1023/b:jmsc.0000021487.40975.3d
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
T. Saji
中科院分区：
文献类型：
--
作者：
S. Teruyama;N. K. Shrestha;Y. Ito;M. Iwanaga;T. Saji
近年来，先进的新型金属复合材料、金属陶瓷复合材料以及其他硬质耐磨材料作为机械零件在工业上得到了越来越广泛的应用。为了加工这些先进材料，需要超硬和超耐磨工具来满足更高生产率的要求，同时还需要工件的几何形状和尺寸精度以及加工件工作表面的精加工。这些要求已经通过涂覆有超硬材料（如金刚石和立方氮化硼（c-BN））的工具来满足。虽然金刚石被认为是最硬的材料，但金刚石工具不能应用于加工相对较高温度的铁类材料，因为在较高温度下铁中的碳会溶解[1]。相比之下，c-BN被称为仅次于金刚石的第二硬材料，具有良好的热稳定性和对铁的化学惰性[2]。c-BN的这些优点打开了黑色金属加工市场。如今，c-BN涂层刀具被广泛用于汽车和航空航天工业领域的铁和铁基合金材料的加工。虽然c-BN可以使用各种改进的物理和化学气相沉积方法[3-6]涂覆在切割，钻孔和研磨工具上，但这些方法的沉积物通常被六方相（h-BN）污染[2，3]。此外，这些方法是昂贵的，因此，已在商业上用电解复合电镀技术，其中c-BN的颗粒与金属，如镍，钴等共沉积替代。然而，这些涂层的性能取决于在金属基体中的颗粒含量，一般来说，需要高的颗粒含量。为了将大量的有机[7]和无机[8-11]颗粒结合到镍基质中，我们的实验室已经开发了各种技术。以前，我们已经证明了通过两步电解法制备的复合涂层具有丰富的颗粒含量，并且这些复合材料表现出良好的抗磨性能[8]。本研究采用两步法在铜基体上沉积Ni/c-BN复合薄膜，并对其耐磨性能进行了研究。然后，在第二步骤中在该基板上进行镍的电沉积。对于电泳沉积，将5g dm-3的c-BN粉末（0-2 μm，BORAZON，GE Micron Products，USA）分散在乙醇中
In recent years, advanced new metal composites, metalceramic composites, and other hard and wear resistant materials have been used more widely as machinery parts in industry. In order to machine these advanced materials, ultra hard and ultra wear resistant tools are required to supply the demands of a higher productivity accompanied by the accuracy of geometry and dimensions of work-pieces as well as the fine finishing of working surfaces of the machined pieces. These requirements have been fulfilled by tools coated with super-hard materials such as diamond and cubic boron nitride (c-BN). Although diamond is known as the hardest material, diamond tools cannot apply to machining ferrous materials where relatively higher temperature is generated due to the problem of the dissolution of carbon in iron at higher temperature [1]. In contrast, c-BN known as the second hardest material after diamond has good thermal stability and chemical inertness regarding iron [2]. These advantages of c-BN have opened up the ferrous machining markets. Nowadays, c-BN coated tools are widely used to machine iron and iron based alloy materials in the field of automotive and aerospace industries. Although c-BN can coat on cutting, drilling and grinding tools using various modified physical and chemical vapor deposition methods [3–6], the deposits by these methods are usually contaminated with the hexagonal phase (h-BN)[2, 3]. Additionally these methods are expensive and therefore, have been commercially substituted with the electrolytic composite plating technique in which particles of c-BN are codeposited with metals such as nickel, cobalt, etc. However, the performance of these coatings depends upon the particle content in the metal matrix, and generally, high particle content is required. In an attempt to incorporate high amount of organic [7] and inorganic [8–11] particles into a nickel matrix, various techniques have been developed in our laboratory. Previously, we have demonstrated that the composite coatings prepared by a two step electrolytic method are rich in particle content and these composites exhibited good anti-wear performance [8]. In the present investigation, we carried out the coating of Ni/c-BN composite film by the two step method and its anti-wear performance was studied.In the first step, c-BN particles were electrophoretically deposited on a copper substrate. Then, electrodeposition of nickel on this substrate was carried out in the second step. For the electrophoretic deposition, 5 g dm− 3 of the c-BN powder (0–2 µm, BORAZON, GE Micron Products, USA) was dispersed in an ethanol