Abstract
Recently, a strategy of synthesizing SiC whisker-reinforced nickel (Ni/SiCw) composites with excellent mechanical properties by electrodeposition has been proposed for exploring its potential applications in micromechanical devices. In this paper, a series of external conditions that affected the content of SiC whiskers in composite films were studied, such as cathode current density, stirring rate and electrolyte temperature. The experimental results indicated that the optimum morphology was obtained at a stirring speed of 300 rpm, a temperature of 50 °C, and a current density of 18 mA/cm2. Additionally, the content of SiC whiskers and textural preference were also investigated by varying its external conditions, and the results demonstrated that the composites with high mass percentage whiskers are more advantageous for electrocrystallization of Ni in the (200) orientation. Finally, the relationship between external conditions and intrinsic morphology, composition and texture of Ni/SiCw composites was revealed, and it provides a constructive approach to fabricate the high-content SiC whiskers of these composites.
Highlights
Electrodeposition is one of the most commercially successful and inexpensive superior techniques for fabrication of metallic coatings
The results indicated that the maximum of particle concentration was 20 g/L and the high stirring speed was chosen to obtain the wear resistant nickel matrix coatings
For the deposited Ni/SiCw composite coatings, the content of SiCw in coatings increased with the increasing current density, 4
Summary
Electrodeposition is one of the most commercially successful and inexpensive superior techniques for fabrication of metallic coatings. The reinforcing particles, suspending in the electrolyte, are entrapped and incorporated into the metal matrix by adopting suitable methods during the co-deposition process, such as electrophoresis, adsorption or mechanical entrapment [1]. Considerable researches have been focused on different types of composites fabricated by the co-deposition method. These composites include ceramics, metals, polymer or microcapsule/liquid incorporated into metal matrices, which could improve the coating properties as mechanical strength, wear/friction-resistance, high-temperature oxidation-resistant and corrosion-resistance [4,5,6,7,8,9,10,11,12,13,14,15]. Based on the SiCw with features in high modulus and tensile strength, good wear resistance, as well as dimensional stability, recently, we have successfully synthesized high mechanical strength Ni/SiCw composites by electrodeposition
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