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Motor Frame Design
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
The electroless plating technology has been developed for many decades. Electroless plating is the process of plating a coating with the aid of a chemical reducing agent (e.g., formaldehyde) in solution without the passage of external power. Compared with electroplating, electroless plating has some superior characteristics: (a) Without using electric current in the plating process, it is easier to obtain uniform coatings on parts. This feature is especially suitable for parts with irregular, complex-shaped geometries. (b) It is applicable to non-conductive substrates such as glass and plastic. (c) Electroless plating can deposit particles from different materials to obtain composite coatings readily for adapting to different application requirements. For instance, nickel–phosphorus coatings are used to enhance corrosion resistance. Alternatively, thin cobalt–phosphorus coatings offer superior sliding wear, enhanced lubricity and corrosion resistance, and improved fatigue properties. Because they exhibit some magnetic properties, they are also of interest to the magnetic recording community.
Applications and Examples
Published in G.K. Awari, C.S. Thorat, Vishwjeet Ambade, D.P. Kothari, Additive Manufacturing and 3D Printing Technology, 2021
G.K. Awari, C.S. Thorat, Vishwjeet Ambade, D.P. Kothari
Plating means coating a metal surface with a plastic or metal substratum by subjecting the surfaces either to electrical current or to a chemical solution. The metal forms used for the plating differ. On the first layer of plastic plating you will most likely use nickel or copper, or even gold and silver. After that, you can apply almost any metal, including: PlatinumChromiumTinPalladiumRhodium
High-k Material Processing in CMOS VLSI Technology
Published in Niladri Pratap Maity, Reshmi Maity, Srimanta Baishya, High-K Gate Dielectric Materials, 2020
The two types of plating technique used are (1) Electroplating (Sahu, 2013) (2) Electrode less plating (Sahu, 2013). Electroplating uses the typical process of coating an object with one or more layers of different metals. Cathode and anode, in this case substrate and metal, arc immersed in an electrolytic solution. When dc is passed through the solution, the positive metal ions migrate from the anode and deposit on the cathode. This method is suitable for conduction films of gold or copper.
Post-processing treatments to enhance additively manufactured polymeric parts: a review
Published in Virtual and Physical Prototyping, 2021
F. Tamburrino, S. Barone, A. Paoli, A. V. Razionale
Plating consists of rendering conductive a nonconductive material, by depositing a thin conductive layer on its surface. Plating can be carried out either by using electrical or chemical energy, in processes known as electroplating (EP) or electroless plating, respectively. Plating is used to enhance the strength and structural integrity as well as to improve the durability and thermal resistance of polymeric materials (Olivera et al. 2016). When electroless plating is used, the metallic layer is deposited through the chemical reduction of metal ions in an aqueous solution and the subsequent deposition of metal without using electrical energy (Equbal and Sood 2014a, 2014b). Surface preparation prior to the plating process is essential to guarantee proper adhesion of the metallic layer on the polymeric substrate (Dixit, Srivastava, and Narain 2019).
Ultrasonic-assisted Ni–Mo–P doping hydrothermal synthesis of clustered spherical MoS2 composite coating: wear and corrosion resistance
Published in Surface Engineering, 2020
Jibo Jiang, Yaoxin Sun, Yukai Chen, Qiongyu Zhou, Haibo Rong, Xiaomin Hu, Haotian Chen, Liying Zhu, Sheng Han
The original materials are more and more difficult to meet the needs of some special environments in the industry. Especially when the material is under high temperature, high pressure, rotted candle medium, etc., the surface is prone to defects such as oxidation, abrasion, corrosion, etc., and these defects often lead to failure of the entire part. Mild steel has low strength and hardness, good ductility and toughness. However, it has poor wear resistance and corrosion resistance. Therefore, in order to prolong its service life, save resources, and improve production efficiency, it is necessary to improve the surface properties of materials [1,2]. Electroless plating technology has been widely used in the industry due to its simple equipment, convenient operation, flexible process, uniform coating thickness, and high surface quality [3,4]. It is a common and important process in the surface treatment industry. Electroless plating is a process in which metal ions in a solution are deposited on a catalytic surface by a reducing agent, which is essentially a redox reaction, that is, a chemical deposition process in which electron transfer is performed but no external power source is present. However, with the development of science, in order to improve the comprehensive performance of binary alloy coatings and meet the needs of materials working under more complicated and more demanding conditions, people have continuously improved the electroless plating process and developed multi-alloy coatings and composite coatings.
Modified polymer nanopillars array for enhanced light trapping on large area
Published in Surface Engineering, 2022
Anagdha Sharma, Sivanandam Aravindan, Paruchuri Venkateswara Rao
Electroless plating is a simple catalytic method of uniform and continuous coating on every intricate part of the activated and sensitised substrate dipped into the aqueous solution of metal ions, unlike the electrodeposition or any vaporisation method, making the substrate harder [18–21]. The alumina particles coated with the nickel-based layer enhanced the hardness of particles by 60% [22]. Electroless plating was utilised for fabrication of hybrid polymer nanostructures for anti-reflection properties [23]. Polymer micro and nanostructures are fabricated by various processes in combination such as electroless plating, lithographic processes, RIE, etc. Polymer nanopillars have recently replaced glass layer in flexible solar cells because of high transmittance, flexibility and affordable cost. The anti-reflective polymer protective sheet in solar cells was structured using electroless and electrochemical plating process followed by microinjection compression moulding process [24]. Periodic micro-grating structures of conical shape were fabricated on the polyethylene terephthalate surface to boost the solar conversion efficiency in photovoltaic modules [25]. Hot embossing process assisted in structuring the anti-reflective protective polymer on large area using the nickel mould [26]. With increase in aspect ratio of nanostructures, reflectance decreased with increased depth of structures [27]. Hot embossing assists in precise fabrication of such high aspect ratio structures on large area with high repeatability. A semi-automatic hot embossing set up was developed to fabricate the nanopillars and nanogrooves on large area of polymer with high precision [28].